Merge pull request #7338 from kpayson64/remove_py_cruft

Removed early adopter code

57 files changed, 0 insertions, 10020 deletions

diff --git a/src/python/grpcio/grpc/_adapter/.gitignore b/src/python/grpcio/grpc/_adapter/.gitignore
deleted file mode 100644
index a6f96cd6db..0000000000
--- a/src/python/grpcio/grpc/_adapter/.gitignore
+++ /dev/null
@@ -1,5 +0,0 @@
-*.a
-*.so
-*.dll
-*.pyc
-*.pyd
diff --git a/src/python/grpcio/grpc/_adapter/__init__.py b/src/python/grpcio/grpc/_adapter/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio/grpc/_adapter/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio/grpc/_adapter/_common.py b/src/python/grpcio/grpc/_adapter/_common.py
deleted file mode 100644
index 492849f4cb..0000000000
--- a/src/python/grpcio/grpc/_adapter/_common.py
+++ /dev/null
@@ -1,76 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State used by both invocation-side and service-side code."""
-
-import enum
-
-
-@enum.unique
-class HighWrite(enum.Enum):
-  """The possible categories of high-level write state."""
-
-  OPEN = 'OPEN'
-  CLOSED = 'CLOSED'
-
-
-class WriteState(object):
-  """A description of the state of writing to an RPC.
-
-  Attributes:
-    low: A side-specific value describing the low-level state of writing.
-    high: A HighWrite value describing the high-level state of writing.
-    pending: A list of bytestrings for the RPC waiting to be written to the
-      other side of the RPC.
-  """
-
-  def __init__(self, low, high, pending):
-    self.low = low
-    self.high = high
-    self.pending = pending
-
-
-class CommonRPCState(object):
-  """A description of an RPC's state.
-
-  Attributes:
-    write: A WriteState describing the state of writing to the RPC.
-    sequence_number: The lowest-unused sequence number for use in generating
-      tickets locally describing the progress of the RPC.
-    deserializer: The behavior to be used to deserialize payload bytestreams
-      taken off the wire.
-    serializer: The behavior to be used to serialize payloads to be sent on the
-      wire.
-  """
-
-  def __init__(self, write, sequence_number, deserializer, serializer):
-    self.write = write
-    self.sequence_number = sequence_number
-    self.deserializer = deserializer
-    self.serializer = serializer
diff --git a/src/python/grpcio/grpc/_adapter/_intermediary_low.py b/src/python/grpcio/grpc/_adapter/_intermediary_low.py
deleted file mode 100644
index 9698ffeabf..0000000000
--- a/src/python/grpcio/grpc/_adapter/_intermediary_low.py
+++ /dev/null
@@ -1,258 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Temporary old _low-like layer.
-
-Eases refactoring burden while we overhaul the Python framework.
-
-Plan:
-    The layers used to look like:
-        ...                # outside _adapter
-        fore.py + rear.py  # visible outside _adapter
-        _low
-        _c
-    The layers currently look like:
-        ...                # outside _adapter
-        fore.py + rear.py  # visible outside _adapter
-        _low_intermediary  # adapter for new '_low' to old '_low'
-        _low               # new '_low'
-        _c                 # new '_c'
-    We will later remove _low_intermediary after refactoring of fore.py and
-    rear.py according to the ticket system refactoring and get:
-        ...                # outside _adapter, refactored
-        fore.py + rear.py  # visible outside _adapter, refactored
-        _low               # new '_low'
-        _c                 # new '_c'
-"""
-
-import collections
-import enum
-
-from grpc._adapter import _low
-from grpc._adapter import _types
-
-_IGNORE_ME_TAG = object()
-Code = _types.StatusCode
-WriteFlags = _types.OpWriteFlags
-
-
-class Status(collections.namedtuple('Status', ['code', 'details'])):
-  """Describes an RPC's overall status."""
-
-
-class ServiceAcceptance(
-    collections.namedtuple(
-        'ServiceAcceptance', ['call', 'method', 'host', 'deadline'])):
-  """Describes an RPC on the service side at the start of service."""
-
-
-class Event(
-    collections.namedtuple(
-        'Event',
-        ['kind', 'tag', 'write_accepted', 'complete_accepted',
-         'service_acceptance', 'bytes', 'status', 'metadata'])):
-  """Describes an event emitted from a completion queue."""
-
-  @enum.unique
-  class Kind(enum.Enum):
-    """Describes the kind of an event."""
-
-    STOP = object()
-    WRITE_ACCEPTED = object()
-    COMPLETE_ACCEPTED = object()
-    SERVICE_ACCEPTED = object()
-    READ_ACCEPTED = object()
-    METADATA_ACCEPTED = object()
-    FINISH = object()
-
-
-class _TagAdapter(collections.namedtuple('_TagAdapter', [
-      'user_tag',
-      'kind'
-  ])):
-  pass
-
-
-class Call(object):
-  """Adapter from old _low.Call interface to new _low.Call."""
-
-  def __init__(self, channel, completion_queue, method, host, deadline):
-    self._internal = channel._internal.create_call(
-        completion_queue._internal, method, host, deadline)
-    self._metadata = []
-
-  @staticmethod
-  def _from_internal(internal):
-    call = Call.__new__(Call)
-    call._internal = internal
-    call._metadata = []
-    return call
-
-  def invoke(self, completion_queue, metadata_tag, finish_tag):
-    err = self._internal.start_batch([
-          _types.OpArgs.send_initial_metadata(self._metadata)
-      ], _IGNORE_ME_TAG)
-    if err != _types.CallError.OK:
-      return err
-    err = self._internal.start_batch([
-          _types.OpArgs.recv_initial_metadata()
-      ], _TagAdapter(metadata_tag, Event.Kind.METADATA_ACCEPTED))
-    if err != _types.CallError.OK:
-      return err
-    err = self._internal.start_batch([
-          _types.OpArgs.recv_status_on_client()
-      ], _TagAdapter(finish_tag, Event.Kind.FINISH))
-    return err
-
-  def write(self, message, tag, flags):
-    return self._internal.start_batch([
-          _types.OpArgs.send_message(message, flags)
-      ], _TagAdapter(tag, Event.Kind.WRITE_ACCEPTED))
-
-  def complete(self, tag):
-    return self._internal.start_batch([
-          _types.OpArgs.send_close_from_client()
-      ], _TagAdapter(tag, Event.Kind.COMPLETE_ACCEPTED))
-
-  def accept(self, completion_queue, tag):
-    return self._internal.start_batch([
-          _types.OpArgs.recv_close_on_server()
-      ], _TagAdapter(tag, Event.Kind.FINISH))
-
-  def add_metadata(self, key, value):
-    self._metadata.append((key, value))
-
-  def premetadata(self):
-    result = self._internal.start_batch([
-          _types.OpArgs.send_initial_metadata(self._metadata)
-      ], _IGNORE_ME_TAG)
-    self._metadata = []
-    return result
-
-  def read(self, tag):
-    return self._internal.start_batch([
-          _types.OpArgs.recv_message()
-      ], _TagAdapter(tag, Event.Kind.READ_ACCEPTED))
-
-  def status(self, status, tag):
-    return self._internal.start_batch([
-          _types.OpArgs.send_status_from_server(
-              self._metadata, status.code, status.details)
-      ], _TagAdapter(tag, Event.Kind.COMPLETE_ACCEPTED))
-
-  def cancel(self):
-    return self._internal.cancel()
-
-  def peer(self):
-    return self._internal.peer()
-
-  def set_credentials(self, creds):
-    return self._internal.set_credentials(creds)
-
-
-class Channel(object):
-  """Adapter from old _low.Channel interface to new _low.Channel."""
-
-  def __init__(self, hostport, channel_credentials, server_host_override=None):
-    args = []
-    if server_host_override:
-      args.append((_types.GrpcChannelArgumentKeys.SSL_TARGET_NAME_OVERRIDE.value, server_host_override))
-    self._internal = _low.Channel(hostport, args, channel_credentials)
-
-
-class CompletionQueue(object):
-  """Adapter from old _low.CompletionQueue interface to new _low.CompletionQueue."""
-
-  def __init__(self):
-    self._internal = _low.CompletionQueue()
-
-  def get(self, deadline=None):
-    if deadline is None:
-      ev = self._internal.next(float('+inf'))
-    else:
-      ev = self._internal.next(deadline)
-    if ev is None:
-      return None
-    elif ev.tag is _IGNORE_ME_TAG:
-      return self.get(deadline)
-    elif ev.type == _types.EventType.QUEUE_SHUTDOWN:
-      kind = Event.Kind.STOP
-      tag = None
-      write_accepted = None
-      complete_accepted = None
-      service_acceptance = None
-      message_bytes = None
-      status = None
-      metadata = None
-    elif ev.type == _types.EventType.OP_COMPLETE:
-      kind = ev.tag.kind
-      tag = ev.tag.user_tag
-      write_accepted = ev.success if kind == Event.Kind.WRITE_ACCEPTED else None
-      complete_accepted = ev.success if kind == Event.Kind.COMPLETE_ACCEPTED else None
-      service_acceptance = ServiceAcceptance(Call._from_internal(ev.call), ev.call_details.method, ev.call_details.host, ev.call_details.deadline) if kind == Event.Kind.SERVICE_ACCEPTED else None
-      message_bytes = ev.results[0].message if kind == Event.Kind.READ_ACCEPTED else None
-      status = Status(ev.results[0].status.code, ev.results[0].status.details) if (kind == Event.Kind.FINISH and ev.results[0].status) else Status(_types.StatusCode.CANCELLED if ev.results[0].cancelled else _types.StatusCode.OK, '') if len(ev.results) > 0 and ev.results[0].cancelled is not None else None
-      metadata = ev.results[0].initial_metadata if (kind in [Event.Kind.SERVICE_ACCEPTED, Event.Kind.METADATA_ACCEPTED]) else (ev.results[0].trailing_metadata if kind == Event.Kind.FINISH else None)
-    else:
-      raise RuntimeError('unknown event')
-    result_ev = Event(kind=kind, tag=tag, write_accepted=write_accepted, complete_accepted=complete_accepted, service_acceptance=service_acceptance, bytes=message_bytes, status=status, metadata=metadata)
-    return result_ev
-
-  def stop(self):
-    self._internal.shutdown()
-
-
-class Server(object):
-  """Adapter from old _low.Server interface to new _low.Server."""
-
-  def __init__(self, completion_queue):
-    self._internal = _low.Server(completion_queue._internal, [])
-    self._internal_cq = completion_queue._internal
-
-  def add_http2_addr(self, addr):
-    return self._internal.add_http2_port(addr)
-
-  def add_secure_http2_addr(self, addr, server_credentials):
-    if server_credentials is None:
-      return self._internal.add_http2_port(addr, None)
-    else:
-      return self._internal.add_http2_port(addr, server_credentials)
-
-  def start(self):
-    return self._internal.start()
-
-  def service(self, tag):
-    return self._internal.request_call(self._internal_cq, _TagAdapter(tag, Event.Kind.SERVICE_ACCEPTED))
-
-  def cancel_all_calls(self):
-    self._internal.cancel_all_calls()
-
-  def stop(self):
-    return self._internal.shutdown(_TagAdapter(None, Event.Kind.STOP))
-
diff --git a/src/python/grpcio/grpc/_adapter/_low.py b/src/python/grpcio/grpc/_adapter/_low.py
deleted file mode 100644
index 48410167a0..0000000000
--- a/src/python/grpcio/grpc/_adapter/_low.py
+++ /dev/null
@@ -1,229 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-import threading
-
-from grpc import _grpcio_metadata
-from grpc import _plugin_wrapping
-from grpc._cython import cygrpc
-from grpc._adapter import _types
-
-_USER_AGENT = 'Python-gRPC-{}'.format(_grpcio_metadata.__version__)
-
-ChannelCredentials = cygrpc.ChannelCredentials
-CallCredentials = cygrpc.CallCredentials
-ServerCredentials = cygrpc.ServerCredentials
-
-channel_credentials_composite = cygrpc.channel_credentials_composite
-call_credentials_composite = cygrpc.call_credentials_composite
-
-def server_credentials_ssl(root_credentials, pair_sequence, force_client_auth):
-  return cygrpc.server_credentials_ssl(
-      root_credentials,
-      [cygrpc.SslPemKeyCertPair(key, pem) for key, pem in pair_sequence],
-      force_client_auth)
-
-def channel_credentials_ssl(
-    root_certificates, private_key, certificate_chain):
-  pair = None
-  if private_key is not None or certificate_chain is not None:
-    pair = cygrpc.SslPemKeyCertPair(private_key, certificate_chain)
-  return cygrpc.channel_credentials_ssl(root_certificates, pair)
-
-
-call_credentials_metadata_plugin = (
-    _plugin_wrapping.call_credentials_metadata_plugin)
-
-
-class CompletionQueue(_types.CompletionQueue):
-
-  def __init__(self):
-    self.completion_queue = cygrpc.CompletionQueue()
-
-  def next(self, deadline=float('+inf')):
-    raw_event = self.completion_queue.poll(cygrpc.Timespec(deadline))
-    if raw_event.type == cygrpc.CompletionType.queue_timeout:
-      return None
-    event_type = raw_event.type
-    event_tag = raw_event.tag
-    event_call = Call(raw_event.operation_call)
-    if raw_event.request_call_details:
-      event_call_details = _types.CallDetails(
-          raw_event.request_call_details.method,
-          raw_event.request_call_details.host,
-          float(raw_event.request_call_details.deadline))
-    else:
-      event_call_details = None
-    event_success = raw_event.success
-    event_results = []
-    if raw_event.is_new_request:
-      event_results.append(_types.OpResult(
-          _types.OpType.RECV_INITIAL_METADATA, raw_event.request_metadata,
-          None, None, None, None))
-    else:
-      if raw_event.batch_operations:
-        for operation in raw_event.batch_operations:
-          result_type = operation.type
-          result_initial_metadata = operation.received_metadata_or_none
-          result_trailing_metadata = operation.received_metadata_or_none
-          result_message = operation.received_message_or_none
-          if result_message is not None:
-            result_message = result_message.bytes()
-          result_cancelled = operation.received_cancelled_or_none
-          if operation.has_status:
-            result_status = _types.Status(
-                operation.received_status_code_or_none,
-                operation.received_status_details_or_none)
-          else:
-            result_status = None
-          event_results.append(
-              _types.OpResult(result_type, result_initial_metadata,
-                              result_trailing_metadata, result_message,
-                              result_status, result_cancelled))
-    return _types.Event(event_type, event_tag, event_call, event_call_details,
-                        event_results, event_success)
-
-  def shutdown(self):
-    self.completion_queue.shutdown()
-
-
-class Call(_types.Call):
-
-  def __init__(self, call):
-    self.call = call
-
-  def start_batch(self, ops, tag):
-    translated_ops = []
-    for op in ops:
-      if op.type == _types.OpType.SEND_INITIAL_METADATA:
-        translated_op = cygrpc.operation_send_initial_metadata(
-            cygrpc.Metadata(
-                cygrpc.Metadatum(key, value)
-                for key, value in op.initial_metadata),
-            op.flags)
-      elif op.type == _types.OpType.SEND_MESSAGE:
-        translated_op = cygrpc.operation_send_message(op.message, op.flags)
-      elif op.type == _types.OpType.SEND_CLOSE_FROM_CLIENT:
-        translated_op = cygrpc.operation_send_close_from_client(op.flags)
-      elif op.type == _types.OpType.SEND_STATUS_FROM_SERVER:
-        translated_op = cygrpc.operation_send_status_from_server(
-            cygrpc.Metadata(
-                cygrpc.Metadatum(key, value)
-                for key, value in op.trailing_metadata),
-            op.status.code,
-            op.status.details,
-            op.flags)
-      elif op.type == _types.OpType.RECV_INITIAL_METADATA:
-        translated_op = cygrpc.operation_receive_initial_metadata(
-            op.flags)
-      elif op.type == _types.OpType.RECV_MESSAGE:
-        translated_op = cygrpc.operation_receive_message(op.flags)
-      elif op.type == _types.OpType.RECV_STATUS_ON_CLIENT:
-        translated_op = cygrpc.operation_receive_status_on_client(
-            op.flags)
-      elif op.type == _types.OpType.RECV_CLOSE_ON_SERVER:
-        translated_op = cygrpc.operation_receive_close_on_server(op.flags)
-      else:
-        raise ValueError('unexpected operation type {}'.format(op.type))
-      translated_ops.append(translated_op)
-    return self.call.start_batch(cygrpc.Operations(translated_ops), tag)
-
-  def cancel(self, code=None, details=None):
-    if code is None and details is None:
-      return self.call.cancel()
-    else:
-      return self.call.cancel(code, details)
-
-  def peer(self):
-    return self.call.peer()
-
-  def set_credentials(self, creds):
-    return self.call.set_credentials(creds)
-
-
-class Channel(_types.Channel):
-
-  def __init__(self, target, args, creds=None):
-    args = list(args) + [
-        (cygrpc.ChannelArgKey.primary_user_agent_string, _USER_AGENT)]
-    args = cygrpc.ChannelArgs(
-        cygrpc.ChannelArg(key, value) for key, value in args)
-    if creds is None:
-      self.channel = cygrpc.Channel(target, args)
-    else:
-      self.channel = cygrpc.Channel(target, args, creds)
-
-  def create_call(self, completion_queue, method, host, deadline=None):
-    internal_call = self.channel.create_call(
-        None, 0, completion_queue.completion_queue, method, host,
-        cygrpc.Timespec(deadline))
-    return Call(internal_call)
-
-  def check_connectivity_state(self, try_to_connect):
-    return self.channel.check_connectivity_state(try_to_connect)
-
-  def watch_connectivity_state(self, last_observed_state, deadline,
-                               completion_queue, tag):
-    self.channel.watch_connectivity_state(
-        last_observed_state, cygrpc.Timespec(deadline),
-        completion_queue.completion_queue, tag)
-
-  def target(self):
-    return self.channel.target()
-
-
-_NO_TAG = object()
-
-class Server(_types.Server):
-
-  def __init__(self, completion_queue, args):
-    args = cygrpc.ChannelArgs(
-        cygrpc.ChannelArg(key, value) for key, value in args)
-    self.server = cygrpc.Server(args)
-    self.server.register_completion_queue(completion_queue.completion_queue)
-    self.server_queue = completion_queue
-
-  def add_http2_port(self, addr, creds=None):
-    if creds is None:
-      return self.server.add_http2_port(addr)
-    else:
-      return self.server.add_http2_port(addr, creds)
-
-  def start(self):
-    return self.server.start()
-
-  def shutdown(self, tag=None):
-    return self.server.shutdown(self.server_queue.completion_queue, tag)
-
-  def request_call(self, completion_queue, tag):
-    return self.server.request_call(completion_queue.completion_queue,
-                                    self.server_queue.completion_queue, tag)
-
-  def cancel_all_calls(self):
-    return self.server.cancel_all_calls()
diff --git a/src/python/grpcio/grpc/_adapter/_types.py b/src/python/grpcio/grpc/_adapter/_types.py
deleted file mode 100644
index b7cc6fbbb5..0000000000
--- a/src/python/grpcio/grpc/_adapter/_types.py
+++ /dev/null
@@ -1,446 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-import abc
-import collections
-import enum
-
-import six
-
-from grpc._cython import cygrpc
-
-
-class GrpcChannelArgumentKeys(enum.Enum):
-  """Mirrors keys used in grpc_channel_args for GRPC-specific arguments."""
-  SSL_TARGET_NAME_OVERRIDE = 'grpc.ssl_target_name_override'
-
-
-@enum.unique
-class CallError(enum.IntEnum):
-  """Mirrors grpc_call_error in the C core."""
-  OK                        = cygrpc.CallError.ok
-  ERROR                     = cygrpc.CallError.error
-  ERROR_NOT_ON_SERVER       = cygrpc.CallError.not_on_server
-  ERROR_NOT_ON_CLIENT       = cygrpc.CallError.not_on_client
-  ERROR_ALREADY_ACCEPTED    = cygrpc.CallError.already_accepted
-  ERROR_ALREADY_INVOKED     = cygrpc.CallError.already_invoked
-  ERROR_NOT_INVOKED         = cygrpc.CallError.not_invoked
-  ERROR_ALREADY_FINISHED    = cygrpc.CallError.already_finished
-  ERROR_TOO_MANY_OPERATIONS = cygrpc.CallError.too_many_operations
-  ERROR_INVALID_FLAGS       = cygrpc.CallError.invalid_flags
-  ERROR_INVALID_METADATA    = cygrpc.CallError.invalid_metadata
-
-
-@enum.unique
-class StatusCode(enum.IntEnum):
-  """Mirrors grpc_status_code in the C core."""
-  OK                  = cygrpc.StatusCode.ok
-  CANCELLED           = cygrpc.StatusCode.cancelled
-  UNKNOWN             = cygrpc.StatusCode.unknown
-  INVALID_ARGUMENT    = cygrpc.StatusCode.invalid_argument
-  DEADLINE_EXCEEDED   = cygrpc.StatusCode.deadline_exceeded
-  NOT_FOUND           = cygrpc.StatusCode.not_found
-  ALREADY_EXISTS      = cygrpc.StatusCode.already_exists
-  PERMISSION_DENIED   = cygrpc.StatusCode.permission_denied
-  RESOURCE_EXHAUSTED  = cygrpc.StatusCode.resource_exhausted
-  FAILED_PRECONDITION = cygrpc.StatusCode.failed_precondition
-  ABORTED             = cygrpc.StatusCode.aborted
-  OUT_OF_RANGE        = cygrpc.StatusCode.out_of_range
-  UNIMPLEMENTED       = cygrpc.StatusCode.unimplemented
-  INTERNAL            = cygrpc.StatusCode.internal
-  UNAVAILABLE         = cygrpc.StatusCode.unavailable
-  DATA_LOSS           = cygrpc.StatusCode.data_loss
-  UNAUTHENTICATED     = cygrpc.StatusCode.unauthenticated
-
-
-@enum.unique
-class OpWriteFlags(enum.IntEnum):
-  """Mirrors defined write-flag constants in the C core."""
-  WRITE_BUFFER_HINT = cygrpc.WriteFlag.buffer_hint
-  WRITE_NO_COMPRESS = cygrpc.WriteFlag.no_compress
-
-
-@enum.unique
-class OpType(enum.IntEnum):
-  """Mirrors grpc_op_type in the C core."""
-  SEND_INITIAL_METADATA   = cygrpc.OperationType.send_initial_metadata
-  SEND_MESSAGE            = cygrpc.OperationType.send_message
-  SEND_CLOSE_FROM_CLIENT  = cygrpc.OperationType.send_close_from_client
-  SEND_STATUS_FROM_SERVER = cygrpc.OperationType.send_status_from_server
-  RECV_INITIAL_METADATA   = cygrpc.OperationType.receive_initial_metadata
-  RECV_MESSAGE            = cygrpc.OperationType.receive_message
-  RECV_STATUS_ON_CLIENT   = cygrpc.OperationType.receive_status_on_client
-  RECV_CLOSE_ON_SERVER    = cygrpc.OperationType.receive_close_on_server
-
-
-@enum.unique
-class EventType(enum.IntEnum):
-  """Mirrors grpc_completion_type in the C core."""
-  QUEUE_SHUTDOWN = cygrpc.CompletionType.queue_shutdown
-  QUEUE_TIMEOUT  = cygrpc.CompletionType.queue_timeout
-  OP_COMPLETE    = cygrpc.CompletionType.operation_complete
-
-
-@enum.unique
-class ConnectivityState(enum.IntEnum):
-  """Mirrors grpc_connectivity_state in the C core."""
-  IDLE              = cygrpc.ConnectivityState.idle
-  CONNECTING        = cygrpc.ConnectivityState.connecting
-  READY             = cygrpc.ConnectivityState.ready
-  TRANSIENT_FAILURE = cygrpc.ConnectivityState.transient_failure
-  FATAL_FAILURE     = cygrpc.ConnectivityState.shutdown
-
-
-class Status(collections.namedtuple(
-    'Status', [
-        'code',
-        'details',
-    ])):
-  """The end status of a GRPC call.
-
-  Attributes:
-    code (StatusCode): ...
-    details (str): ...
-  """
-
-
-class CallDetails(collections.namedtuple(
-    'CallDetails', [
-        'method',
-        'host',
-        'deadline',
-    ])):
-  """Provides information to the server about the client's call.
-
-  Attributes:
-    method (str): ...
-    host (str): ...
-    deadline (float): ...
-  """
-
-
-class OpArgs(collections.namedtuple(
-    'OpArgs', [
-        'type',
-        'initial_metadata',
-        'trailing_metadata',
-        'message',
-        'status',
-        'flags',
-    ])):
-  """Arguments passed into a GRPC operation.
-
-  Attributes:
-    type (OpType): ...
-    initial_metadata (sequence of 2-sequence of str): Only valid if type ==
-      OpType.SEND_INITIAL_METADATA, else is None.
-    trailing_metadata (sequence of 2-sequence of str): Only valid if type ==
-      OpType.SEND_STATUS_FROM_SERVER, else is None.
-    message (bytes): Only valid if type == OpType.SEND_MESSAGE, else is None.
-    status (Status): Only valid if type == OpType.SEND_STATUS_FROM_SERVER, else
-      is None.
-    flags (int): a bitwise OR'ing of 0 or more OpWriteFlags values.
-  """
-
-  @staticmethod
-  def send_initial_metadata(initial_metadata):
-    return OpArgs(OpType.SEND_INITIAL_METADATA, initial_metadata, None, None, None, 0)
-
-  @staticmethod
-  def send_message(message, flags):
-    return OpArgs(OpType.SEND_MESSAGE, None, None, message, None, flags)
-
-  @staticmethod
-  def send_close_from_client():
-    return OpArgs(OpType.SEND_CLOSE_FROM_CLIENT, None, None, None, None, 0)
-
-  @staticmethod
-  def send_status_from_server(trailing_metadata, status_code, status_details):
-    return OpArgs(OpType.SEND_STATUS_FROM_SERVER, None, trailing_metadata, None, Status(status_code, status_details), 0)
-
-  @staticmethod
-  def recv_initial_metadata():
-    return OpArgs(OpType.RECV_INITIAL_METADATA, None, None, None, None, 0);
-
-  @staticmethod
-  def recv_message():
-    return OpArgs(OpType.RECV_MESSAGE, None, None, None, None, 0)
-
-  @staticmethod
-  def recv_status_on_client():
-    return OpArgs(OpType.RECV_STATUS_ON_CLIENT, None, None, None, None, 0)
-
-  @staticmethod
-  def recv_close_on_server():
-    return OpArgs(OpType.RECV_CLOSE_ON_SERVER, None, None, None, None, 0)
-
-
-class OpResult(collections.namedtuple(
-    'OpResult', [
-        'type',
-        'initial_metadata',
-        'trailing_metadata',
-        'message',
-        'status',
-        'cancelled',
-    ])):
-  """Results received from a GRPC operation.
-
-  Attributes:
-    type (OpType): ...
-    initial_metadata (sequence of 2-sequence of str): Only valid if type ==
-      OpType.RECV_INITIAL_METADATA, else is None.
-    trailing_metadata (sequence of 2-sequence of str): Only valid if type ==
-      OpType.RECV_STATUS_ON_CLIENT, else is None.
-    message (bytes): Only valid if type == OpType.RECV_MESSAGE, else is None.
-    status (Status): Only valid if type == OpType.RECV_STATUS_ON_CLIENT, else
-      is None.
-    cancelled (bool): Only valid if type == OpType.RECV_CLOSE_ON_SERVER, else
-      is None.
-  """
-
-
-class Event(collections.namedtuple(
-    'Event', [
-        'type',
-        'tag',
-        'call',
-        'call_details',
-        'results',
-        'success',
-    ])):
-  """An event received from a GRPC completion queue.
-
-  Attributes:
-    type (EventType): ...
-    tag (object): ...
-    call (Call): The Call object associated with this event (if there is one,
-      else None).
-    call_details (CallDetails): The call details associated with the
-      server-side call (if there is such information, else None).
-    results (list of OpResult): ...
-    success (bool): ...
-  """
-
-
-class CompletionQueue(six.with_metaclass(abc.ABCMeta)):
-
-  @abc.abstractmethod
-  def __init__(self):
-    pass
-
-  def __iter__(self):
-    """This class may be iterated over.
-
-    This is the equivalent of calling next() repeatedly with an absolute
-    deadline of None (i.e. no deadline).
-    """
-    return self
-
-  def __next__(self):
-    return self.next()
-
-  @abc.abstractmethod
-  def next(self, deadline=float('+inf')):
-    """Get the next event on this completion queue.
-
-    Args:
-      deadline (float): absolute deadline in seconds from the Python epoch, or
-        None for no deadline.
-
-    Returns:
-      Event: ...
-    """
-    pass
-
-  @abc.abstractmethod
-  def shutdown(self):
-    """Begin the shutdown process of this completion queue.
-
-    Note that this does not immediately destroy the completion queue.
-    Nevertheless, user code should not pass it around after invoking this.
-    """
-    return None
-
-
-class Call(six.with_metaclass(abc.ABCMeta)):
-
-  @abc.abstractmethod
-  def start_batch(self, ops, tag):
-    """Start a batch of operations.
-
-    Args:
-      ops (sequence of OpArgs): ...
-      tag (object): ...
-
-    Returns:
-      CallError: ...
-    """
-    return CallError.ERROR
-
-  @abc.abstractmethod
-  def cancel(self, code=None, details=None):
-    """Cancel the call.
-
-    Args:
-      code (int): Status code to cancel with (on the server side). If
-        specified, so must `details`.
-      details (str): Status details to cancel with (on the server side). If
-        specified, so must `code`.
-
-    Returns:
-      CallError: ...
-    """
-    return CallError.ERROR
-
-  @abc.abstractmethod
-  def peer(self):
-    """Get the peer of this call.
-
-    Returns:
-      str: the peer of this call.
-    """
-    return None
-
-  def set_credentials(self, creds):
-    """Set per-call credentials.
-
-    Args:
-      creds (CallCredentials): Credentials to be set for this call.
-    """
-    return None
-
-
-class Channel(six.with_metaclass(abc.ABCMeta)):
-
-  @abc.abstractmethod
-  def __init__(self, target, args, credentials=None):
-    """Initialize a Channel.
-
-    Args:
-      target (str): ...
-      args (sequence of 2-sequence of str, (str|integer)): ...
-      credentials (ChannelCredentials): If None, create an insecure channel,
-        else create a secure channel using the client credentials.
-    """
-
-  @abc.abstractmethod
-  def create_call(self, completion_queue, method, host, deadline=float('+inf')):
-    """Create a call from this channel.
-
-    Args:
-      completion_queue (CompletionQueue): ...
-      method (str): ...
-      host (str): ...
-      deadline (float): absolute deadline in seconds from the Python epoch, or
-        None for no deadline.
-
-    Returns:
-      Call: call object associated with this Channel and passed parameters.
-    """
-    return None
-
-  @abc.abstractmethod
-  def check_connectivity_state(self, try_to_connect):
-    """Check and optionally repair the connectivity state of the channel.
-
-    Args:
-      try_to_connect (bool): whether or not to try to connect the channel if
-      disconnected.
-
-    Returns:
-      ConnectivityState: state of the channel at the time of this invocation.
-    """
-    return None
-
-  @abc.abstractmethod
-  def watch_connectivity_state(self, last_observed_state, deadline,
-                               completion_queue, tag):
-    """Watch for connectivity state changes from the last_observed_state.
-
-    Args:
-      last_observed_state (ConnectivityState): ...
-      deadline (float): ...
-      completion_queue (CompletionQueue): ...
-      tag (object) ...
-    """
-
-  @abc.abstractmethod
-  def target(self):
-    """Get the target of this channel.
-
-    Returns:
-      str: the target of this channel.
-    """
-    return None
-
-
-class Server(six.with_metaclass(abc.ABCMeta)):
-
-  @abc.abstractmethod
-  def __init__(self, completion_queue, args):
-    """Initialize a server.
-
-    Args:
-      completion_queue (CompletionQueue): ...
-      args (sequence of 2-sequence of str, (str|integer)): ...
-    """
-
-  @abc.abstractmethod
-  def add_http2_port(self, address, credentials=None):
-    """Adds an HTTP/2 address+port to the server.
-
-    Args:
-      address (str): ...
-      credentials (ServerCredentials): If None, create an insecure port, else
-        create a secure port using the server credentials.
-    """
-
-  @abc.abstractmethod
-  def start(self):
-    """Starts the server."""
-
-  @abc.abstractmethod
-  def shutdown(self, tag=None):
-    """Shuts down the server. Does not immediately destroy the server.
-
-    Args:
-      tag (object): if not None, have the server place an event on its
-        completion queue notifying it when this server has completely shut down.
-    """
-
-  @abc.abstractmethod
-  def request_call(self, completion_queue, tag):
-    """Requests a call from the server on the server's completion queue.
-
-    Args:
-      completion_queue (CompletionQueue): Completion queue for the call. May be
-        the same as the server's completion queue.
-      tag (object) ...
-    """
diff --git a/src/python/grpcio/grpc/_links/__init__.py b/src/python/grpcio/grpc/_links/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio/grpc/_links/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio/grpc/_links/_constants.py b/src/python/grpcio/grpc/_links/_constants.py
deleted file mode 100644
index 117fc5a639..0000000000
--- a/src/python/grpcio/grpc/_links/_constants.py
+++ /dev/null
@@ -1,42 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Constants for use within this package."""
-
-from grpc._adapter import _intermediary_low
-from grpc.beta import interfaces as beta_interfaces
-
-LOW_STATUS_CODE_TO_HIGH_STATUS_CODE = {
-    low: high for low, high in zip(
-        _intermediary_low.Code, beta_interfaces.StatusCode)
-}
-
-HIGH_STATUS_CODE_TO_LOW_STATUS_CODE = {
-    high: low for low, high in LOW_STATUS_CODE_TO_HIGH_STATUS_CODE.items()
-}
diff --git a/src/python/grpcio/grpc/_links/invocation.py b/src/python/grpcio/grpc/_links/invocation.py
deleted file mode 100644
index 003653e1c8..0000000000
--- a/src/python/grpcio/grpc/_links/invocation.py
+++ /dev/null
@@ -1,453 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""The RPC-invocation-side bridge between RPC Framework and GRPC-on-the-wire."""
-
-import abc
-import enum
-import logging
-import threading
-import time
-
-import six
-
-from grpc._adapter import _intermediary_low
-from grpc._links import _constants
-from grpc.beta import interfaces as beta_interfaces
-from grpc.framework.foundation import activated
-from grpc.framework.foundation import logging_pool
-from grpc.framework.foundation import relay
-from grpc.framework.interfaces.links import links
-
-_IDENTITY = lambda x: x
-
-_STOP = _intermediary_low.Event.Kind.STOP
-_WRITE = _intermediary_low.Event.Kind.WRITE_ACCEPTED
-_COMPLETE = _intermediary_low.Event.Kind.COMPLETE_ACCEPTED
-_READ = _intermediary_low.Event.Kind.READ_ACCEPTED
-_METADATA = _intermediary_low.Event.Kind.METADATA_ACCEPTED
-_FINISH = _intermediary_low.Event.Kind.FINISH
-
-
-@enum.unique
-class _Read(enum.Enum):
-  AWAITING_METADATA = 'awaiting metadata'
-  READING = 'reading'
-  AWAITING_ALLOWANCE = 'awaiting allowance'
-  CLOSED = 'closed'
-
-
-@enum.unique
-class _HighWrite(enum.Enum):
-  OPEN = 'open'
-  CLOSED = 'closed'
-
-
-@enum.unique
-class _LowWrite(enum.Enum):
-  OPEN = 'OPEN'
-  ACTIVE = 'ACTIVE'
-  CLOSED = 'CLOSED'
-
-
-class _Context(beta_interfaces.GRPCInvocationContext):
-
-  def __init__(self):
-    self._lock = threading.Lock()
-    self._disable_next_compression = False
-
-  def disable_next_request_compression(self):
-    with self._lock:
-      self._disable_next_compression = True
-
-  def next_compression_disabled(self):
-    with self._lock:
-      disabled = self._disable_next_compression
-      self._disable_next_compression = False
-      return disabled
-
-
-class _RPCState(object):
-
-  def __init__(
-      self, call, request_serializer, response_deserializer, sequence_number,
-      read, allowance, high_write, low_write, due, context):
-    self.call = call
-    self.request_serializer = request_serializer
-    self.response_deserializer = response_deserializer
-    self.sequence_number = sequence_number
-    self.read = read
-    self.allowance = allowance
-    self.high_write = high_write
-    self.low_write = low_write
-    self.due = due
-    self.context = context
-
-
-def _no_longer_due(kind, rpc_state, key, rpc_states):
-  rpc_state.due.remove(kind)
-  if not rpc_state.due:
-    del rpc_states[key]
-
-
-class _Kernel(object):
-
-  def __init__(
-      self, channel, host, metadata_transformer, request_serializers,
-      response_deserializers, ticket_relay):
-    self._lock = threading.Lock()
-    self._channel = channel
-    self._host = host
-    self._metadata_transformer = metadata_transformer
-    self._request_serializers = request_serializers
-    self._response_deserializers = response_deserializers
-    self._relay = ticket_relay
-
-    self._completion_queue = None
-    self._rpc_states = {}
-    self._pool = None
-
-  def _on_write_event(self, operation_id, unused_event, rpc_state):
-    if rpc_state.high_write is _HighWrite.CLOSED:
-      rpc_state.call.complete(operation_id)
-      rpc_state.due.add(_COMPLETE)
-      rpc_state.due.remove(_WRITE)
-      rpc_state.low_write = _LowWrite.CLOSED
-    else:
-      ticket = links.Ticket(
-          operation_id, rpc_state.sequence_number, None, None, None, None, 1,
-          None, None, None, None, None, None, None)
-      rpc_state.sequence_number += 1
-      self._relay.add_value(ticket)
-      rpc_state.low_write = _LowWrite.OPEN
-      _no_longer_due(_WRITE, rpc_state, operation_id, self._rpc_states)
-
-  def _on_read_event(self, operation_id, event, rpc_state):
-    if event.bytes is None or _FINISH not in rpc_state.due:
-      rpc_state.read = _Read.CLOSED
-      _no_longer_due(_READ, rpc_state, operation_id, self._rpc_states)
-    else:
-      if 0 < rpc_state.allowance:
-        rpc_state.allowance -= 1
-        rpc_state.call.read(operation_id)
-      else:
-        rpc_state.read = _Read.AWAITING_ALLOWANCE
-        _no_longer_due(_READ, rpc_state, operation_id, self._rpc_states)
-      ticket = links.Ticket(
-          operation_id, rpc_state.sequence_number, None, None, None, None, None,
-          None, rpc_state.response_deserializer(event.bytes), None, None, None,
-          None, None)
-      rpc_state.sequence_number += 1
-      self._relay.add_value(ticket)
-
-  def _on_metadata_event(self, operation_id, event, rpc_state):
-    if _FINISH in rpc_state.due:
-      rpc_state.allowance -= 1
-      rpc_state.call.read(operation_id)
-      rpc_state.read = _Read.READING
-      rpc_state.due.add(_READ)
-      rpc_state.due.remove(_METADATA)
-      ticket = links.Ticket(
-          operation_id, rpc_state.sequence_number, None, None,
-          links.Ticket.Subscription.FULL, None, None, event.metadata, None,
-          None, None, None, None, None)
-      rpc_state.sequence_number += 1
-      self._relay.add_value(ticket)
-    else:
-      _no_longer_due(_METADATA, rpc_state, operation_id, self._rpc_states)
-
-  def _on_finish_event(self, operation_id, event, rpc_state):
-    _no_longer_due(_FINISH, rpc_state, operation_id, self._rpc_states)
-    if event.status.code == _intermediary_low.Code.OK:
-      termination = links.Ticket.Termination.COMPLETION
-    elif event.status.code == _intermediary_low.Code.CANCELLED:
-      termination = links.Ticket.Termination.CANCELLATION
-    elif event.status.code == _intermediary_low.Code.DEADLINE_EXCEEDED:
-      termination = links.Ticket.Termination.EXPIRATION
-    elif event.status.code == _intermediary_low.Code.UNIMPLEMENTED:
-      termination = links.Ticket.Termination.REMOTE_FAILURE
-    elif event.status.code == _intermediary_low.Code.UNKNOWN:
-      termination = links.Ticket.Termination.LOCAL_FAILURE
-    else:
-      termination = links.Ticket.Termination.TRANSMISSION_FAILURE
-    code = _constants.LOW_STATUS_CODE_TO_HIGH_STATUS_CODE[event.status.code]
-    ticket = links.Ticket(
-        operation_id, rpc_state.sequence_number, None, None, None, None, None,
-        None, None, event.metadata, code, event.status.details, termination,
-        None)
-    rpc_state.sequence_number += 1
-    self._relay.add_value(ticket)
-
-  def _spin(self, completion_queue):
-    while True:
-      event = completion_queue.get(None)
-      with self._lock:
-        rpc_state = self._rpc_states.get(event.tag, None)
-        if event.kind is _STOP:
-          pass
-        elif event.kind is _WRITE:
-          self._on_write_event(event.tag, event, rpc_state)
-        elif event.kind is _METADATA:
-          self._on_metadata_event(event.tag, event, rpc_state)
-        elif event.kind is _READ:
-          self._on_read_event(event.tag, event, rpc_state)
-        elif event.kind is _FINISH:
-          self._on_finish_event(event.tag, event, rpc_state)
-        elif event.kind is _COMPLETE:
-          _no_longer_due(_COMPLETE, rpc_state, event.tag, self._rpc_states)
-        else:
-          logging.error('Illegal RPC event! %s', (event,))
-
-        if self._completion_queue is None and not self._rpc_states:
-          completion_queue.stop()
-          return
-
-  def _invoke(
-      self, operation_id, group, method, initial_metadata, payload, termination,
-      timeout, allowance, options):
-    """Invoke an RPC.
-
-    Args:
-      operation_id: Any object to be used as an operation ID for the RPC.
-      group: The group to which the RPC method belongs.
-      method: The RPC method name.
-      initial_metadata: The initial metadata object for the RPC.
-      payload: A payload object for the RPC or None if no payload was given at
-        invocation-time.
-      termination: A links.Ticket.Termination value or None indicated whether or
-        not more writes will follow from this side of the RPC.
-      timeout: A duration of time in seconds to allow for the RPC.
-      allowance: The number of payloads (beyond the free first one) that the
-        local ticket exchange mate has granted permission to be read.
-      options: A beta_interfaces.GRPCCallOptions value or None.
-    """
-    if termination is links.Ticket.Termination.COMPLETION:
-      high_write = _HighWrite.CLOSED
-    elif termination is None:
-      high_write = _HighWrite.OPEN
-    else:
-      return
-
-    transformed_initial_metadata = self._metadata_transformer(initial_metadata)
-    request_serializer = self._request_serializers.get(
-        (group, method), _IDENTITY)
-    response_deserializer = self._response_deserializers.get(
-        (group, method), _IDENTITY)
-
-    call = _intermediary_low.Call(
-        self._channel, self._completion_queue, '/%s/%s' % (group, method),
-        self._host, time.time() + timeout)
-    if options is not None and options.credentials is not None:
-      call.set_credentials(options.credentials._low_credentials)
-    if transformed_initial_metadata is not None:
-      for metadata_key, metadata_value in transformed_initial_metadata:
-        call.add_metadata(metadata_key, metadata_value)
-    call.invoke(self._completion_queue, operation_id, operation_id)
-    if payload is None:
-      if high_write is _HighWrite.CLOSED:
-        call.complete(operation_id)
-        low_write = _LowWrite.CLOSED
-        due = set((_METADATA, _COMPLETE, _FINISH,))
-      else:
-        low_write = _LowWrite.OPEN
-        due = set((_METADATA, _FINISH,))
-    else:
-      if options is not None and options.disable_compression:
-        flags = _intermediary_low.WriteFlags.WRITE_NO_COMPRESS
-      else:
-        flags = 0
-      call.write(request_serializer(payload), operation_id, flags)
-      low_write = _LowWrite.ACTIVE
-      due = set((_WRITE, _METADATA, _FINISH,))
-    context = _Context()
-    self._rpc_states[operation_id] = _RPCState(
-        call, request_serializer, response_deserializer, 1,
-        _Read.AWAITING_METADATA, 1 if allowance is None else (1 + allowance),
-        high_write, low_write, due, context)
-    protocol = links.Protocol(links.Protocol.Kind.INVOCATION_CONTEXT, context)
-    ticket = links.Ticket(
-        operation_id, 0, None, None, None, None, None, None, None, None, None,
-        None, None, protocol)
-    self._relay.add_value(ticket)
-
-  def _advance(self, operation_id, rpc_state, payload, termination, allowance):
-    if payload is not None:
-      disable_compression = rpc_state.context.next_compression_disabled()
-      if disable_compression:
-        flags = _intermediary_low.WriteFlags.WRITE_NO_COMPRESS
-      else:
-        flags = 0
-      rpc_state.call.write(
-          rpc_state.request_serializer(payload), operation_id, flags)
-      rpc_state.low_write = _LowWrite.ACTIVE
-      rpc_state.due.add(_WRITE)
-
-    if allowance is not None:
-      if rpc_state.read is _Read.AWAITING_ALLOWANCE:
-        rpc_state.allowance += allowance - 1
-        rpc_state.call.read(operation_id)
-        rpc_state.read = _Read.READING
-        rpc_state.due.add(_READ)
-      else:
-        rpc_state.allowance += allowance
-
-    if termination is links.Ticket.Termination.COMPLETION:
-      rpc_state.high_write = _HighWrite.CLOSED
-      if rpc_state.low_write is _LowWrite.OPEN:
-        rpc_state.call.complete(operation_id)
-        rpc_state.due.add(_COMPLETE)
-        rpc_state.low_write = _LowWrite.CLOSED
-    elif termination is not None:
-      rpc_state.call.cancel()
-
-  def add_ticket(self, ticket):
-    with self._lock:
-      if ticket.sequence_number == 0:
-        if self._completion_queue is None:
-          logging.error('Received invocation ticket %s after stop!', ticket)
-        else:
-          if (ticket.protocol is not None and
-              ticket.protocol.kind is links.Protocol.Kind.CALL_OPTION):
-            grpc_call_options = ticket.protocol.value
-          else:
-            grpc_call_options = None
-          self._invoke(
-              ticket.operation_id, ticket.group, ticket.method,
-              ticket.initial_metadata, ticket.payload, ticket.termination,
-              ticket.timeout, ticket.allowance, grpc_call_options)
-      else:
-        rpc_state = self._rpc_states.get(ticket.operation_id)
-        if rpc_state is not None:
-          self._advance(
-              ticket.operation_id, rpc_state, ticket.payload,
-              ticket.termination, ticket.allowance)
-
-  def start(self):
-    """Starts this object.
-
-    This method must be called before attempting to exchange tickets with this
-    object.
-    """
-    with self._lock:
-      self._completion_queue = _intermediary_low.CompletionQueue()
-      self._pool = logging_pool.pool(1)
-      self._pool.submit(self._spin, self._completion_queue)
-
-  def stop(self):
-    """Stops this object.
-
-    This method must be called for proper termination of this object, and no
-    attempts to exchange tickets with this object may be made after this method
-    has been called.
-    """
-    with self._lock:
-      if not self._rpc_states:
-        self._completion_queue.stop()
-      self._completion_queue = None
-      pool = self._pool
-    pool.shutdown(wait=True)
-
-
-class InvocationLink(six.with_metaclass(abc.ABCMeta, links.Link, activated.Activated)):
-  """A links.Link for use on the invocation-side of a gRPC connection.
-
-  Implementations of this interface are only valid for use when activated.
-  """
-
-
-class _InvocationLink(InvocationLink):
-
-  def __init__(
-      self, channel, host, metadata_transformer, request_serializers,
-      response_deserializers):
-    self._relay = relay.relay(None)
-    self._kernel = _Kernel(
-        channel, host,
-        _IDENTITY if metadata_transformer is None else metadata_transformer,
-        {} if request_serializers is None else request_serializers,
-        {} if response_deserializers is None else response_deserializers,
-        self._relay)
-
-  def _start(self):
-    self._relay.start()
-    self._kernel.start()
-    return self
-
-  def _stop(self):
-    self._kernel.stop()
-    self._relay.stop()
-
-  def accept_ticket(self, ticket):
-    """See links.Link.accept_ticket for specification."""
-    self._kernel.add_ticket(ticket)
-
-  def join_link(self, link):
-    """See links.Link.join_link for specification."""
-    self._relay.set_behavior(link.accept_ticket)
-
-  def __enter__(self):
-    """See activated.Activated.__enter__ for specification."""
-    return self._start()
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    """See activated.Activated.__exit__ for specification."""
-    self._stop()
-    return False
-
-  def start(self):
-    """See activated.Activated.start for specification."""
-    return self._start()
-
-  def stop(self):
-    """See activated.Activated.stop for specification."""
-    self._stop()
-
-
-def invocation_link(
-    channel, host, metadata_transformer, request_serializers,
-    response_deserializers):
-  """Creates an InvocationLink.
-
-  Args:
-    channel: An _intermediary_low.Channel for use by the link.
-    host: The host to specify when invoking RPCs.
-    metadata_transformer: A callable that takes an invocation-side initial
-      metadata value and returns another metadata value to send in its place.
-      May be None.
-    request_serializers: A dict from group-method pair to request object
-      serialization behavior.
-    response_deserializers: A dict from group-method pair to response object
-      deserialization behavior.
-
-  Returns:
-    An InvocationLink.
-  """
-  return _InvocationLink(
-      channel, host, metadata_transformer, request_serializers,
-      response_deserializers)
diff --git a/src/python/grpcio/grpc/_links/service.py b/src/python/grpcio/grpc/_links/service.py
deleted file mode 100644
index 5fc4994ca0..0000000000
--- a/src/python/grpcio/grpc/_links/service.py
+++ /dev/null
@@ -1,509 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""The RPC-service-side bridge between RPC Framework and GRPC-on-the-wire."""
-
-import abc
-import enum
-import logging
-import threading
-import six
-import time
-
-from grpc._adapter import _intermediary_low
-from grpc._links import _constants
-from grpc.beta import interfaces as beta_interfaces
-from grpc.framework.foundation import logging_pool
-from grpc.framework.foundation import relay
-from grpc.framework.interfaces.links import links
-
-_IDENTITY = lambda x: x
-
-_TERMINATION_KIND_TO_CODE = {
-    links.Ticket.Termination.COMPLETION: _intermediary_low.Code.OK,
-    links.Ticket.Termination.CANCELLATION: _intermediary_low.Code.CANCELLED,
-    links.Ticket.Termination.EXPIRATION:
-        _intermediary_low.Code.DEADLINE_EXCEEDED,
-    links.Ticket.Termination.SHUTDOWN: _intermediary_low.Code.UNAVAILABLE,
-    links.Ticket.Termination.RECEPTION_FAILURE: _intermediary_low.Code.INTERNAL,
-    links.Ticket.Termination.TRANSMISSION_FAILURE:
-        _intermediary_low.Code.INTERNAL,
-    links.Ticket.Termination.LOCAL_FAILURE: _intermediary_low.Code.UNKNOWN,
-    links.Ticket.Termination.REMOTE_FAILURE: _intermediary_low.Code.UNKNOWN,
-}
-
-_STOP = _intermediary_low.Event.Kind.STOP
-_WRITE = _intermediary_low.Event.Kind.WRITE_ACCEPTED
-_COMPLETE = _intermediary_low.Event.Kind.COMPLETE_ACCEPTED
-_SERVICE = _intermediary_low.Event.Kind.SERVICE_ACCEPTED
-_READ = _intermediary_low.Event.Kind.READ_ACCEPTED
-_FINISH = _intermediary_low.Event.Kind.FINISH
-
-
-@enum.unique
-class _Read(enum.Enum):
-  READING = 'reading'
-  # TODO(issue 2916): This state will again be necessary after eliminating the
-  # "early_read" field of _RPCState and going back to only reading when granted
-  # allowance to read.
-  # AWAITING_ALLOWANCE = 'awaiting allowance'
-  CLOSED = 'closed'
-
-
-@enum.unique
-class _HighWrite(enum.Enum):
-  OPEN = 'open'
-  CLOSED = 'closed'
-
-
-@enum.unique
-class _LowWrite(enum.Enum):
-  """The possible categories of low-level write state."""
-
-  OPEN = 'OPEN'
-  ACTIVE = 'ACTIVE'
-  CLOSED = 'CLOSED'
-
-
-class _Context(beta_interfaces.GRPCServicerContext):
-
-  def __init__(self, call):
-    self._lock = threading.Lock()
-    self._call = call
-    self._disable_next_compression = False
-
-  def peer(self):
-    with self._lock:
-      return self._call.peer()
-
-  def disable_next_response_compression(self):
-    with self._lock:
-      self._disable_next_compression = True
-
-  def next_compression_disabled(self):
-    with self._lock:
-      disabled = self._disable_next_compression
-      self._disable_next_compression = False
-      return disabled
-
-
-class _RPCState(object):
-
-  def __init__(
-      self, request_deserializer, response_serializer, sequence_number, read,
-      early_read, allowance, high_write, low_write, premetadataed,
-      terminal_metadata, code, message, due, context):
-    self.request_deserializer = request_deserializer
-    self.response_serializer = response_serializer
-    self.sequence_number = sequence_number
-    self.read = read
-    # TODO(issue 2916): Eliminate this by eliminating the necessity of calling
-    # call.read just to advance the RPC.
-    self.early_read = early_read  # A raw (not deserialized) read.
-    self.allowance = allowance
-    self.high_write = high_write
-    self.low_write = low_write
-    self.premetadataed = premetadataed
-    self.terminal_metadata = terminal_metadata
-    self.code = code
-    self.message = message
-    self.due = due
-    self.context = context
-
-
-def _no_longer_due(kind, rpc_state, key, rpc_states):
-  rpc_state.due.remove(kind)
-  if not rpc_state.due:
-    del rpc_states[key]
-
-
-def _metadatafy(call, metadata):
-  for metadata_key, metadata_value in metadata:
-    call.add_metadata(metadata_key, metadata_value)
-
-
-def _status(termination_kind, high_code, details):
-  low_details = b'' if details is None else details
-  if high_code is None:
-    low_code = _TERMINATION_KIND_TO_CODE[termination_kind]
-  else:
-    low_code = _constants.HIGH_STATUS_CODE_TO_LOW_STATUS_CODE[high_code]
-  return _intermediary_low.Status(low_code, low_details)
-
-
-class _Kernel(object):
-
-  def __init__(self, request_deserializers, response_serializers, ticket_relay):
-    self._lock = threading.Lock()
-    self._request_deserializers = request_deserializers
-    self._response_serializers = response_serializers
-    self._relay = ticket_relay
-
-    self._completion_queue = None
-    self._due = set()
-    self._server = None
-    self._rpc_states = {}
-    self._pool = None
-
-  def _on_service_acceptance_event(self, event, server):
-    server.service(None)
-
-    service_acceptance = event.service_acceptance
-    call = service_acceptance.call
-    call.accept(self._completion_queue, call)
-    try:
-      service_method = service_acceptance.method
-      if six.PY3:
-          service_method = service_method.decode('latin1')
-      group, method = service_method.split('/')[1:3]
-    except ValueError:
-      logging.info('Illegal path "%s"!', service_acceptance.method)
-      return
-    request_deserializer = self._request_deserializers.get(
-        (group, method), _IDENTITY)
-    response_serializer = self._response_serializers.get(
-        (group, method), _IDENTITY)
-
-    call.read(call)
-    context = _Context(call)
-    self._rpc_states[call] = _RPCState(
-        request_deserializer, response_serializer, 1, _Read.READING, None, 1,
-        _HighWrite.OPEN, _LowWrite.OPEN, False, None, None, None,
-        set((_READ, _FINISH,)), context)
-    protocol = links.Protocol(links.Protocol.Kind.SERVICER_CONTEXT, context)
-    ticket = links.Ticket(
-        call, 0, group, method, links.Ticket.Subscription.FULL,
-        service_acceptance.deadline - time.time(), None, event.metadata, None,
-        None, None, None, None, protocol)
-    self._relay.add_value(ticket)
-
-  def _on_read_event(self, event):
-    call = event.tag
-    rpc_state = self._rpc_states[call]
-
-    if event.bytes is None:
-      rpc_state.read = _Read.CLOSED
-      payload = None
-      termination = links.Ticket.Termination.COMPLETION
-      _no_longer_due(_READ, rpc_state, call, self._rpc_states)
-    else:
-      if 0 < rpc_state.allowance:
-        payload = rpc_state.request_deserializer(event.bytes)
-        termination = None
-        rpc_state.allowance -= 1
-        call.read(call)
-      else:
-        rpc_state.early_read = event.bytes
-        _no_longer_due(_READ, rpc_state, call, self._rpc_states)
-        return
-        # TODO(issue 2916): Instead of returning:
-        # rpc_state.read = _Read.AWAITING_ALLOWANCE
-    ticket = links.Ticket(
-        call, rpc_state.sequence_number, None, None, None, None, None, None,
-        payload, None, None, None, termination, None)
-    rpc_state.sequence_number += 1
-    self._relay.add_value(ticket)
-
-  def _on_write_event(self, event):
-    call = event.tag
-    rpc_state = self._rpc_states[call]
-
-    if rpc_state.high_write is _HighWrite.CLOSED:
-      if rpc_state.terminal_metadata is not None:
-        _metadatafy(call, rpc_state.terminal_metadata)
-      status = _status(
-          links.Ticket.Termination.COMPLETION, rpc_state.code,
-          rpc_state.message)
-      call.status(status, call)
-      rpc_state.low_write = _LowWrite.CLOSED
-      rpc_state.due.add(_COMPLETE)
-      rpc_state.due.remove(_WRITE)
-    else:
-      ticket = links.Ticket(
-          call, rpc_state.sequence_number, None, None, None, None, 1, None,
-          None, None, None, None, None, None)
-      rpc_state.sequence_number += 1
-      self._relay.add_value(ticket)
-      rpc_state.low_write = _LowWrite.OPEN
-      _no_longer_due(_WRITE, rpc_state, call, self._rpc_states)
-
-  def _on_finish_event(self, event):
-    call = event.tag
-    rpc_state = self._rpc_states[call]
-    _no_longer_due(_FINISH, rpc_state, call, self._rpc_states)
-    code = event.status.code
-    if code == _intermediary_low.Code.OK:
-      return
-
-    if code == _intermediary_low.Code.CANCELLED:
-      termination = links.Ticket.Termination.CANCELLATION
-    elif code == _intermediary_low.Code.DEADLINE_EXCEEDED:
-      termination = links.Ticket.Termination.EXPIRATION
-    else:
-      termination = links.Ticket.Termination.TRANSMISSION_FAILURE
-    ticket = links.Ticket(
-        call, rpc_state.sequence_number, None, None, None, None, None, None,
-        None, None, None, None, termination, None)
-    rpc_state.sequence_number += 1
-    self._relay.add_value(ticket)
-
-  def _spin(self, completion_queue, server):
-    while True:
-      event = completion_queue.get(None)
-      with self._lock:
-        if event.kind is _STOP:
-          self._due.remove(_STOP)
-        elif event.kind is _READ:
-          self._on_read_event(event)
-        elif event.kind is _WRITE:
-          self._on_write_event(event)
-        elif event.kind is _COMPLETE:
-          _no_longer_due(
-              _COMPLETE, self._rpc_states.get(event.tag), event.tag,
-              self._rpc_states)
-        elif event.kind is _intermediary_low.Event.Kind.FINISH:
-          self._on_finish_event(event)
-        elif event.kind is _SERVICE:
-          if self._server is None:
-            self._due.remove(_SERVICE)
-          else:
-            self._on_service_acceptance_event(event, server)
-        else:
-          logging.error('Illegal event! %s', (event,))
-
-        if not self._due and not self._rpc_states:
-          completion_queue.stop()
-          return
-
-  def add_ticket(self, ticket):
-    with self._lock:
-      call = ticket.operation_id
-      rpc_state = self._rpc_states.get(call)
-      if rpc_state is None:
-        return
-
-      if ticket.initial_metadata is not None:
-        _metadatafy(call, ticket.initial_metadata)
-        call.premetadata()
-        rpc_state.premetadataed = True
-      elif not rpc_state.premetadataed:
-        if (ticket.terminal_metadata is not None or
-            ticket.payload is not None or
-            ticket.termination is not None or
-            ticket.code is not None or
-            ticket.message is not None):
-          call.premetadata()
-          rpc_state.premetadataed = True
-
-      if ticket.allowance is not None:
-        if rpc_state.early_read is None:
-          rpc_state.allowance += ticket.allowance
-        else:
-          payload = rpc_state.request_deserializer(rpc_state.early_read)
-          rpc_state.allowance += ticket.allowance - 1
-          rpc_state.early_read = None
-          if rpc_state.read is _Read.READING:
-            call.read(call)
-            rpc_state.due.add(_READ)
-            termination = None
-          else:
-            termination = links.Ticket.Termination.COMPLETION
-          early_read_ticket = links.Ticket(
-              call, rpc_state.sequence_number, None, None, None, None, None,
-              None, payload, None, None, None, termination, None)
-          rpc_state.sequence_number += 1
-          self._relay.add_value(early_read_ticket)
-
-      if ticket.payload is not None:
-        disable_compression = rpc_state.context.next_compression_disabled()
-        if disable_compression:
-          flags = _intermediary_low.WriteFlags.WRITE_NO_COMPRESS
-        else:
-          flags = 0
-        call.write(rpc_state.response_serializer(ticket.payload), call, flags)
-        rpc_state.due.add(_WRITE)
-        rpc_state.low_write = _LowWrite.ACTIVE
-
-      if ticket.terminal_metadata is not None:
-        rpc_state.terminal_metadata = ticket.terminal_metadata
-      if ticket.code is not None:
-        rpc_state.code = ticket.code
-      if ticket.message is not None:
-        rpc_state.message = ticket.message
-
-      if ticket.termination is links.Ticket.Termination.COMPLETION:
-        rpc_state.high_write = _HighWrite.CLOSED
-        if rpc_state.low_write is _LowWrite.OPEN:
-          if rpc_state.terminal_metadata is not None:
-            _metadatafy(call, rpc_state.terminal_metadata)
-          status = _status(
-              links.Ticket.Termination.COMPLETION, rpc_state.code,
-              rpc_state.message)
-          call.status(status, call)
-          rpc_state.due.add(_COMPLETE)
-          rpc_state.low_write = _LowWrite.CLOSED
-      elif ticket.termination is not None:
-        if rpc_state.terminal_metadata is not None:
-          _metadatafy(call, rpc_state.terminal_metadata)
-        status = _status(
-            ticket.termination, rpc_state.code, rpc_state.message)
-        call.status(status, call)
-        rpc_state.due.add(_COMPLETE)
-
-  def add_port(self, address, server_credentials):
-    with self._lock:
-      if self._server is None:
-        self._completion_queue = _intermediary_low.CompletionQueue()
-        self._server = _intermediary_low.Server(self._completion_queue)
-      if server_credentials is None:
-        return self._server.add_http2_addr(address)
-      else:
-        return self._server.add_secure_http2_addr(address, server_credentials)
-
-  def start(self):
-    with self._lock:
-      if self._server is None:
-        self._completion_queue = _intermediary_low.CompletionQueue()
-        self._server = _intermediary_low.Server(self._completion_queue)
-      self._pool = logging_pool.pool(1)
-      self._pool.submit(self._spin, self._completion_queue, self._server)
-      self._server.start()
-      self._server.service(None)
-      self._due.add(_SERVICE)
-
-  def begin_stop(self):
-    with self._lock:
-      self._server.stop()
-      self._due.add(_STOP)
-      self._server = None
-
-  def end_stop(self):
-    with self._lock:
-      pool = self._pool
-    pool.shutdown(wait=True)
-
-
-class ServiceLink(links.Link):
-  """A links.Link for use on the service-side of a gRPC connection.
-
-  Implementations of this interface are only valid for use between calls to
-  their start method and one of their stop methods.
-  """
-
-  @abc.abstractmethod
-  def add_port(self, address, server_credentials):
-    """Adds a port on which to service RPCs after this link has been started.
-
-    Args:
-      address: The address on which to service RPCs with a port number of zero
-        requesting that a port number be automatically selected and used.
-      server_credentials: An _intermediary_low.ServerCredentials object, or
-        None for insecure service.
-
-    Returns:
-      An integer port on which RPCs will be serviced after this link has been
-        started. This is typically the same number as the port number contained
-        in the passed address, but will likely be different if the port number
-        contained in the passed address was zero.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def start(self):
-    """Starts this object.
-
-    This method must be called before attempting to use this Link in ticket
-    exchange.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def begin_stop(self):
-    """Indicate imminent link stop and immediate rejection of new RPCs.
-
-    New RPCs will be rejected as soon as this method is called, but ongoing RPCs
-    will be allowed to continue until they terminate. This method does not
-    block.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def end_stop(self):
-    """Finishes stopping this link.
-
-    begin_stop must have been called exactly once before calling this method.
-
-    All in-progress RPCs will be terminated immediately.
-    """
-    raise NotImplementedError()
-
-
-class _ServiceLink(ServiceLink):
-
-  def __init__(self, request_deserializers, response_serializers):
-    self._relay = relay.relay(None)
-    self._kernel = _Kernel(
-        {} if request_deserializers is None else request_deserializers,
-        {} if response_serializers is None else response_serializers,
-        self._relay)
-
-  def accept_ticket(self, ticket):
-    self._kernel.add_ticket(ticket)
-
-  def join_link(self, link):
-    self._relay.set_behavior(link.accept_ticket)
-
-  def add_port(self, address, server_credentials):
-    return self._kernel.add_port(address, server_credentials)
-
-  def start(self):
-    self._relay.start()
-    return self._kernel.start()
-
-  def begin_stop(self):
-    self._kernel.begin_stop()
-
-  def end_stop(self):
-    self._kernel.end_stop()
-    self._relay.stop()
-
-
-def service_link(request_deserializers, response_serializers):
-  """Creates a ServiceLink.
-
-  Args:
-    request_deserializers: A dict from group-method pair to request object
-      deserialization behavior.
-    response_serializers: A dict from group-method pair to response ojbect
-      serialization behavior.
-
-  Returns:
-    A ServiceLink.
-  """
-  return _ServiceLink(request_deserializers, response_serializers)
diff --git a/src/python/grpcio/grpc/beta/_server.py b/src/python/grpcio/grpc/beta/_server.py
deleted file mode 100644
index eb0aadb42f..0000000000
--- a/src/python/grpcio/grpc/beta/_server.py
+++ /dev/null
@@ -1,209 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Beta API server implementation."""
-
-import threading
-
-from grpc._links import service
-from grpc.beta import interfaces
-from grpc.framework.core import implementations as _core_implementations
-from grpc.framework.crust import implementations as _crust_implementations
-from grpc.framework.foundation import logging_pool
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.links import utilities
-
-_DEFAULT_POOL_SIZE = 8
-_DEFAULT_TIMEOUT = 300
-_MAXIMUM_TIMEOUT = 24 * 60 * 60
-
-
-def _set_event():
-  event = threading.Event()
-  event.set()
-  return event
-
-
-class _GRPCServicer(base.Servicer):
-
-  def __init__(self, delegate):
-    self._delegate = delegate
-
-  def service(self, group, method, context, output_operator):
-    try:
-      return self._delegate.service(group, method, context, output_operator)
-    except base.NoSuchMethodError as e:
-      if e.code is None and e.details is None:
-        raise base.NoSuchMethodError(
-            interfaces.StatusCode.UNIMPLEMENTED,
-            'Method "%s" of service "%s" not implemented!' % (method, group))
-      else:
-        raise
-
-
-class _Server(interfaces.Server):
-
-  def __init__(
-      self, implementations, multi_implementation, pool, pool_size,
-      default_timeout, maximum_timeout, grpc_link):
-    self._lock = threading.Lock()
-    self._implementations = implementations
-    self._multi_implementation = multi_implementation
-    self._customer_pool = pool
-    self._pool_size = pool_size
-    self._default_timeout = default_timeout
-    self._maximum_timeout = maximum_timeout
-    self._grpc_link = grpc_link
-
-    self._end_link = None
-    self._stop_events = None
-    self._pool = None
-
-  def _start(self):
-    with self._lock:
-      if self._end_link is not None:
-        raise ValueError('Cannot start already-started server!')
-
-      if self._customer_pool is None:
-        self._pool = logging_pool.pool(self._pool_size)
-        assembly_pool = self._pool
-      else:
-        assembly_pool = self._customer_pool
-
-      servicer = _GRPCServicer(
-          _crust_implementations.servicer(
-              self._implementations, self._multi_implementation, assembly_pool))
-
-      self._end_link = _core_implementations.service_end_link(
-          servicer, self._default_timeout, self._maximum_timeout)
-
-      self._grpc_link.join_link(self._end_link)
-      self._end_link.join_link(self._grpc_link)
-      self._grpc_link.start()
-      self._end_link.start()
-
-  def _dissociate_links_and_shut_down_pool(self):
-    self._grpc_link.end_stop()
-    self._grpc_link.join_link(utilities.NULL_LINK)
-    self._end_link.join_link(utilities.NULL_LINK)
-    self._end_link = None
-    if self._pool is not None:
-      self._pool.shutdown(wait=True)
-    self._pool = None
-
-  def _stop_stopping(self):
-    self._dissociate_links_and_shut_down_pool()
-    for stop_event in self._stop_events:
-      stop_event.set()
-    self._stop_events = None
-
-  def _stop_started(self):
-    self._grpc_link.begin_stop()
-    self._end_link.stop(0).wait()
-    self._dissociate_links_and_shut_down_pool()
-
-  def _foreign_thread_stop(self, end_stop_event, stop_events):
-    end_stop_event.wait()
-    with self._lock:
-      if self._stop_events is stop_events:
-        self._stop_stopping()
-
-  def _schedule_stop(self, grace):
-    with self._lock:
-      if self._end_link is None:
-        return _set_event()
-      server_stop_event = threading.Event()
-      if self._stop_events is None:
-        self._stop_events = [server_stop_event]
-        self._grpc_link.begin_stop()
-      else:
-        self._stop_events.append(server_stop_event)
-      end_stop_event = self._end_link.stop(grace)
-      end_stop_thread = threading.Thread(
-          target=self._foreign_thread_stop,
-          args=(end_stop_event, self._stop_events))
-      end_stop_thread.start()
-      return server_stop_event
-
-  def _stop_now(self):
-    with self._lock:
-      if self._end_link is not None:
-        if self._stop_events is None:
-          self._stop_started()
-        else:
-          self._stop_stopping()
-
-  def add_insecure_port(self, address):
-    with self._lock:
-      if self._end_link is None:
-        return self._grpc_link.add_port(address, None)
-      else:
-        raise ValueError('Can\'t add port to serving server!')
-
-  def add_secure_port(self, address, server_credentials):
-    with self._lock:
-      if self._end_link is None:
-        return self._grpc_link.add_port(
-            address, server_credentials._low_credentials)  # pylint: disable=protected-access
-      else:
-        raise ValueError('Can\'t add port to serving server!')
-
-  def start(self):
-    self._start()
-
-  def stop(self, grace):
-    if 0 < grace:
-      return self._schedule_stop(grace)
-    else:
-      self._stop_now()
-      return _set_event()
-
-  def __enter__(self):
-    self._start()
-    return self
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    self._stop_now()
-    return False
-
-  def __del__(self):
-    self._stop_now()
-
-
-def server(
-    implementations, multi_implementation, request_deserializers,
-    response_serializers, thread_pool, thread_pool_size, default_timeout,
-    maximum_timeout):
-  grpc_link = service.service_link(request_deserializers, response_serializers)
-  return _Server(
-      implementations, multi_implementation, thread_pool,
-      _DEFAULT_POOL_SIZE if thread_pool_size is None else thread_pool_size,
-      _DEFAULT_TIMEOUT if default_timeout is None else default_timeout,
-      _MAXIMUM_TIMEOUT if maximum_timeout is None else maximum_timeout,
-      grpc_link)
diff --git a/src/python/grpcio/grpc/beta/_stub.py b/src/python/grpcio/grpc/beta/_stub.py
deleted file mode 100644
index 2af019309a..0000000000
--- a/src/python/grpcio/grpc/beta/_stub.py
+++ /dev/null
@@ -1,155 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Beta API stub implementation."""
-
-import threading
-
-from grpc._links import invocation
-from grpc.framework.core import implementations as _core_implementations
-from grpc.framework.crust import implementations as _crust_implementations
-from grpc.framework.foundation import logging_pool
-from grpc.framework.interfaces.links import utilities
-
-_DEFAULT_POOL_SIZE = 6
-
-
-class _AutoIntermediary(object):
-
-  def __init__(self, up, down, delegate):
-    self._lock = threading.Lock()
-    self._up = up
-    self._down = down
-    self._in_context = False
-    self._delegate = delegate
-
-  def __getattr__(self, attr):
-    with self._lock:
-      if self._delegate is None:
-        raise AttributeError('No useful attributes out of context!')
-      else:
-        return getattr(self._delegate, attr)
-
-  def __enter__(self):
-    with self._lock:
-      if self._in_context:
-        raise ValueError('Already in context!')
-      elif self._delegate is None:
-        self._delegate = self._up()
-      self._in_context = True
-      return self
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    with self._lock:
-      if not self._in_context:
-        raise ValueError('Not in context!')
-      self._down()
-      self._in_context = False
-      self._delegate = None
-      return False
-
-  def __del__(self):
-    with self._lock:
-      if self._delegate is not None:
-        self._down()
-        self._delegate = None
-
-
-class _StubAssemblyManager(object):
-
-  def __init__(
-      self, thread_pool, thread_pool_size, end_link, grpc_link, stub_creator):
-    self._thread_pool = thread_pool
-    self._pool_size = thread_pool_size
-    self._end_link = end_link
-    self._grpc_link = grpc_link
-    self._stub_creator = stub_creator
-    self._own_pool = None
-
-  def up(self):
-    if self._thread_pool is None:
-      self._own_pool = logging_pool.pool(
-          _DEFAULT_POOL_SIZE if self._pool_size is None else self._pool_size)
-      assembly_pool = self._own_pool
-    else:
-      assembly_pool = self._thread_pool
-    self._end_link.join_link(self._grpc_link)
-    self._grpc_link.join_link(self._end_link)
-    self._end_link.start()
-    self._grpc_link.start()
-    return self._stub_creator(self._end_link, assembly_pool)
-
-  def down(self):
-    self._end_link.stop(0).wait()
-    self._grpc_link.stop()
-    self._end_link.join_link(utilities.NULL_LINK)
-    self._grpc_link.join_link(utilities.NULL_LINK)
-    if self._own_pool is not None:
-      self._own_pool.shutdown(wait=True)
-      self._own_pool = None
-
-
-def _assemble(
-    channel, host, metadata_transformer, request_serializers,
-    response_deserializers, thread_pool, thread_pool_size, stub_creator):
-  end_link = _core_implementations.invocation_end_link()
-  grpc_link = invocation.invocation_link(
-      channel, host, metadata_transformer, request_serializers,
-      response_deserializers)
-  stub_assembly_manager = _StubAssemblyManager(
-      thread_pool, thread_pool_size, end_link, grpc_link, stub_creator)
-  stub = stub_assembly_manager.up()
-  return _AutoIntermediary(
-      stub_assembly_manager.up, stub_assembly_manager.down, stub)
-
-
-def _dynamic_stub_creator(service, cardinalities):
-  def create_dynamic_stub(end_link, invocation_pool):
-    return _crust_implementations.dynamic_stub(
-        end_link, service, cardinalities, invocation_pool)
-  return create_dynamic_stub
-
-
-def generic_stub(
-    channel, host, metadata_transformer, request_serializers,
-    response_deserializers, thread_pool, thread_pool_size):
-  return _assemble(
-      channel, host, metadata_transformer, request_serializers,
-      response_deserializers, thread_pool, thread_pool_size,
-      _crust_implementations.generic_stub)
-
-
-def dynamic_stub(
-    channel, host, service, cardinalities, metadata_transformer,
-    request_serializers, response_deserializers, thread_pool,
-    thread_pool_size):
-  return _assemble(
-      channel, host, metadata_transformer, request_serializers,
-      response_deserializers, thread_pool, thread_pool_size,
-      _dynamic_stub_creator(service, cardinalities))
diff --git a/src/python/grpcio/grpc/beta/implementations.py b/src/python/grpcio/grpc/beta/implementations.py
index 4ae6e7d675..ab25fd5eec 100644
--- a/src/python/grpcio/grpc/beta/implementations.py
+++ b/src/python/grpcio/grpc/beta/implementations.py
@@ -37,7 +37,6 @@ import threading  # pylint: disable=unused-import
 # cardinality and face are referenced from specification in this module.
 import grpc
 from grpc import _auth
-from grpc._adapter import _types
 from grpc.beta import _client_adaptations
 from grpc.beta import _server_adaptations
 from grpc.beta import interfaces
diff --git a/src/python/grpcio/grpc/framework/core/__init__.py b/src/python/grpcio/grpc/framework/core/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio/grpc/framework/core/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio/grpc/framework/core/_constants.py b/src/python/grpcio/grpc/framework/core/_constants.py
deleted file mode 100644
index 0f47cb48e0..0000000000
--- a/src/python/grpcio/grpc/framework/core/_constants.py
+++ /dev/null
@@ -1,60 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Private constants for the package."""
-
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.links import links
-
-TICKET_SUBSCRIPTION_FOR_BASE_SUBSCRIPTION_KIND = {
-    base.Subscription.Kind.NONE: links.Ticket.Subscription.NONE,
-    base.Subscription.Kind.TERMINATION_ONLY:
-        links.Ticket.Subscription.TERMINATION,
-    base.Subscription.Kind.FULL: links.Ticket.Subscription.FULL,
-    }
-
-# Mapping from abortive operation outcome to ticket termination to be
-# sent to the other side of the operation, or None to indicate that no
-# ticket should be sent to the other side in the event of such an
-# outcome.
-ABORTION_OUTCOME_TO_TICKET_TERMINATION = {
-    base.Outcome.Kind.CANCELLED: links.Ticket.Termination.CANCELLATION,
-    base.Outcome.Kind.EXPIRED: links.Ticket.Termination.EXPIRATION,
-    base.Outcome.Kind.LOCAL_SHUTDOWN: links.Ticket.Termination.SHUTDOWN,
-    base.Outcome.Kind.REMOTE_SHUTDOWN: None,
-    base.Outcome.Kind.RECEPTION_FAILURE:
-        links.Ticket.Termination.RECEPTION_FAILURE,
-    base.Outcome.Kind.TRANSMISSION_FAILURE: None,
-    base.Outcome.Kind.LOCAL_FAILURE: links.Ticket.Termination.LOCAL_FAILURE,
-    base.Outcome.Kind.REMOTE_FAILURE: links.Ticket.Termination.REMOTE_FAILURE,
-}
-
-INTERNAL_ERROR_LOG_MESSAGE = ':-( RPC Framework (Core) internal error! )-:'
-TERMINATION_CALLBACK_EXCEPTION_LOG_MESSAGE = (
-    'Exception calling termination callback!')
diff --git a/src/python/grpcio/grpc/framework/core/_context.py b/src/python/grpcio/grpc/framework/core/_context.py
deleted file mode 100644
index a346e9d478..0000000000
--- a/src/python/grpcio/grpc/framework/core/_context.py
+++ /dev/null
@@ -1,94 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for operation context."""
-
-import time
-
-# _interfaces is referenced from specification in this module.
-from grpc.framework.core import _interfaces  # pylint: disable=unused-import
-from grpc.framework.core import _utilities
-from grpc.framework.interfaces.base import base
-
-
-class OperationContext(base.OperationContext):
-  """An implementation of interfaces.OperationContext."""
-
-  def __init__(
-      self, lock, termination_manager, transmission_manager,
-      expiration_manager):
-    """Constructor.
-
-    Args:
-      lock: The operation-wide lock.
-      termination_manager: The _interfaces.TerminationManager for the operation.
-      transmission_manager: The _interfaces.TransmissionManager for the
-        operation.
-      expiration_manager: The _interfaces.ExpirationManager for the operation.
-    """
-    self._lock = lock
-    self._termination_manager = termination_manager
-    self._transmission_manager = transmission_manager
-    self._expiration_manager = expiration_manager
-
-  def _abort(self, outcome_kind):
-    with self._lock:
-      if self._termination_manager.outcome is None:
-        outcome = _utilities.Outcome(outcome_kind, None, None)
-        self._termination_manager.abort(outcome)
-        self._transmission_manager.abort(outcome)
-        self._expiration_manager.terminate()
-
-  def outcome(self):
-    """See base.OperationContext.outcome for specification."""
-    with self._lock:
-      return self._termination_manager.outcome
-
-  def add_termination_callback(self, callback):
-    """See base.OperationContext.add_termination_callback."""
-    with self._lock:
-      if self._termination_manager.outcome is None:
-        self._termination_manager.add_callback(callback)
-        return None
-      else:
-        return self._termination_manager.outcome
-
-  def time_remaining(self):
-    """See base.OperationContext.time_remaining for specification."""
-    with self._lock:
-      deadline = self._expiration_manager.deadline()
-    return max(0.0, deadline - time.time())
-
-  def cancel(self):
-    """See base.OperationContext.cancel for specification."""
-    self._abort(base.Outcome.Kind.CANCELLED)
-
-  def fail(self, exception):
-    """See base.OperationContext.fail for specification."""
-    self._abort(base.Outcome.Kind.LOCAL_FAILURE)
diff --git a/src/python/grpcio/grpc/framework/core/_emission.py b/src/python/grpcio/grpc/framework/core/_emission.py
deleted file mode 100644
index 8ab59dc3e5..0000000000
--- a/src/python/grpcio/grpc/framework/core/_emission.py
+++ /dev/null
@@ -1,100 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for handling emitted values."""
-
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _utilities
-from grpc.framework.interfaces.base import base
-
-
-class EmissionManager(_interfaces.EmissionManager):
-  """An EmissionManager implementation."""
-
-  def __init__(
-      self, lock, termination_manager, transmission_manager,
-      expiration_manager):
-    """Constructor.
-
-    Args:
-      lock: The operation-wide lock.
-      termination_manager: The _interfaces.TerminationManager for the operation.
-      transmission_manager: The _interfaces.TransmissionManager for the
-        operation.
-      expiration_manager: The _interfaces.ExpirationManager for the operation.
-    """
-    self._lock = lock
-    self._termination_manager = termination_manager
-    self._transmission_manager = transmission_manager
-    self._expiration_manager = expiration_manager
-    self._ingestion_manager = None
-
-    self._initial_metadata_seen = False
-    self._payload_seen = False
-    self._completion_seen = False
-
-  def set_ingestion_manager(self, ingestion_manager):
-    """Sets the ingestion manager with which this manager will cooperate.
-
-    Args:
-      ingestion_manager: The _interfaces.IngestionManager for the operation.
-    """
-    self._ingestion_manager = ingestion_manager
-
-  def advance(
-      self, initial_metadata=None, payload=None, completion=None,
-      allowance=None):
-    initial_metadata_present = initial_metadata is not None
-    payload_present = payload is not None
-    completion_present = completion is not None
-    allowance_present = allowance is not None
-    with self._lock:
-      if self._termination_manager.outcome is None:
-        if (initial_metadata_present and (
-                self._initial_metadata_seen or self._payload_seen or
-                self._completion_seen) or
-            payload_present and self._completion_seen or
-            completion_present and self._completion_seen or
-            allowance_present and allowance <= 0):
-          outcome = _utilities.Outcome(
-              base.Outcome.Kind.LOCAL_FAILURE, None, None)
-          self._termination_manager.abort(outcome)
-          self._transmission_manager.abort(outcome)
-          self._expiration_manager.terminate()
-        else:
-          self._initial_metadata_seen |= initial_metadata_present
-          self._payload_seen |= payload_present
-          self._completion_seen |= completion_present
-          if completion_present:
-            self._termination_manager.emission_complete()
-            self._ingestion_manager.local_emissions_done()
-          self._transmission_manager.advance(
-              initial_metadata, payload, completion, allowance)
-          if allowance_present:
-            self._ingestion_manager.add_local_allowance(allowance)
diff --git a/src/python/grpcio/grpc/framework/core/_end.py b/src/python/grpcio/grpc/framework/core/_end.py
deleted file mode 100644
index 009d27c915..0000000000
--- a/src/python/grpcio/grpc/framework/core/_end.py
+++ /dev/null
@@ -1,244 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Implementation of base.End."""
-
-import abc
-import threading
-import uuid
-
-import six
-
-from grpc.framework.core import _operation
-from grpc.framework.core import _utilities
-from grpc.framework.foundation import callable_util
-from grpc.framework.foundation import later
-from grpc.framework.foundation import logging_pool
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.links import links
-from grpc.framework.interfaces.links import utilities
-
-_IDLE_ACTION_EXCEPTION_LOG_MESSAGE = 'Exception calling idle action!'
-
-
-class End(six.with_metaclass(abc.ABCMeta, base.End, links.Link)):
-  """A bridge between base.End and links.Link.
-
-  Implementations of this interface translate arriving tickets into
-  calls on application objects implementing base interfaces and
-  translate calls from application objects implementing base interfaces
-  into tickets sent to a joined link.
-  """
-
-
-class _Cycle(object):
-  """State for a single start-stop End lifecycle."""
-
-  def __init__(self, pool):
-    self.pool = pool
-    self.grace = False
-    self.futures = []
-    self.operations = {}
-    self.idle_actions = []
-
-
-def _abort(operations):
-  for operation in operations:
-    operation.abort(base.Outcome.Kind.LOCAL_SHUTDOWN)
-
-
-def _cancel_futures(futures):
-  for future in futures:
-    future.cancel()
-
-
-def _future_shutdown(lock, cycle, event):
-  def in_future():
-    with lock:
-      _abort(cycle.operations.values())
-      _cancel_futures(cycle.futures)
-  return in_future
-
-
-class _End(End):
-  """An End implementation."""
-
-  def __init__(self, servicer_package):
-    """Constructor.
-
-    Args:
-      servicer_package: A _ServicerPackage for servicing operations or None if
-        this end will not be used to service operations.
-    """
-    self._lock = threading.Condition()
-    self._servicer_package = servicer_package
-
-    self._stats = {outcome_kind: 0 for outcome_kind in base.Outcome.Kind}
-
-    self._mate = None
-
-    self._cycle = None
-
-  def _termination_action(self, operation_id):
-    """Constructs the termination action for a single operation.
-
-    Args:
-      operation_id: The operation ID for the termination action.
-
-    Returns:
-      A callable that takes an operation outcome kind as its sole parameter and
-        that should be used as the termination action for the operation
-        associated with the given operation ID.
-    """
-    def termination_action(outcome_kind):
-      with self._lock:
-        self._stats[outcome_kind] += 1
-        self._cycle.operations.pop(operation_id, None)
-        if not self._cycle.operations:
-          for action in self._cycle.idle_actions:
-            self._cycle.pool.submit(action)
-          self._cycle.idle_actions = []
-          if self._cycle.grace:
-            _cancel_futures(self._cycle.futures)
-            self._cycle.pool.shutdown(wait=False)
-            self._cycle = None
-    return termination_action
-
-  def start(self):
-    """See base.End.start for specification."""
-    with self._lock:
-      if self._cycle is not None:
-        raise ValueError('Tried to start a not-stopped End!')
-      else:
-        self._cycle = _Cycle(logging_pool.pool(1))
-
-  def stop(self, grace):
-    """See base.End.stop for specification."""
-    with self._lock:
-      if self._cycle is None:
-        event = threading.Event()
-        event.set()
-        return event
-      elif not self._cycle.operations:
-        event = threading.Event()
-        self._cycle.pool.submit(event.set)
-        self._cycle.pool.shutdown(wait=False)
-        self._cycle = None
-        return event
-      else:
-        self._cycle.grace = True
-        event = threading.Event()
-        self._cycle.idle_actions.append(event.set)
-        if 0 < grace:
-          future = later.later(
-              grace, _future_shutdown(self._lock, self._cycle, event))
-          self._cycle.futures.append(future)
-        else:
-          _abort(self._cycle.operations.values())
-        return event
-
-  def operate(
-      self, group, method, subscription, timeout, initial_metadata=None,
-      payload=None, completion=None, protocol_options=None):
-    """See base.End.operate for specification."""
-    operation_id = uuid.uuid4()
-    with self._lock:
-      if self._cycle is None or self._cycle.grace:
-        raise ValueError('Can\'t operate on stopped or stopping End!')
-      termination_action = self._termination_action(operation_id)
-      operation = _operation.invocation_operate(
-          operation_id, group, method, subscription, timeout, protocol_options,
-          initial_metadata, payload, completion, self._mate.accept_ticket,
-          termination_action, self._cycle.pool)
-      self._cycle.operations[operation_id] = operation
-      return operation.context, operation.operator
-
-  def operation_stats(self):
-    """See base.End.operation_stats for specification."""
-    with self._lock:
-      return dict(self._stats)
-
-  def add_idle_action(self, action):
-    """See base.End.add_idle_action for specification."""
-    with self._lock:
-      if self._cycle is None:
-        raise ValueError('Can\'t add idle action to stopped End!')
-      action_with_exceptions_logged = callable_util.with_exceptions_logged(
-          action, _IDLE_ACTION_EXCEPTION_LOG_MESSAGE)
-      if self._cycle.operations:
-        self._cycle.idle_actions.append(action_with_exceptions_logged)
-      else:
-        self._cycle.pool.submit(action_with_exceptions_logged)
-
-  def accept_ticket(self, ticket):
-    """See links.Link.accept_ticket for specification."""
-    with self._lock:
-      if self._cycle is not None:
-        operation = self._cycle.operations.get(ticket.operation_id)
-        if operation is not None:
-          operation.handle_ticket(ticket)
-        elif self._servicer_package is not None and not self._cycle.grace:
-          termination_action = self._termination_action(ticket.operation_id)
-          operation = _operation.service_operate(
-              self._servicer_package, ticket, self._mate.accept_ticket,
-              termination_action, self._cycle.pool)
-          if operation is not None:
-            self._cycle.operations[ticket.operation_id] = operation
-
-  def join_link(self, link):
-    """See links.Link.join_link for specification."""
-    with self._lock:
-      self._mate = utilities.NULL_LINK if link is None else link
-
-
-def serviceless_end_link():
-  """Constructs an End usable only for invoking operations.
-
-  Returns:
-    An End usable for translating operations into ticket exchange.
-  """
-  return _End(None)
-
-
-def serviceful_end_link(servicer, default_timeout, maximum_timeout):
-  """Constructs an End capable of servicing operations.
-
-  Args:
-    servicer: An interfaces.Servicer for servicing operations.
-    default_timeout: A length of time in seconds to be used as the default
-      time alloted for a single operation.
-    maximum_timeout: A length of time in seconds to be used as the maximum
-      time alloted for a single operation.
-
-  Returns:
-    An End capable of servicing the operations requested of it through ticket
-      exchange.
-  """
-  return _End(
-      _utilities.ServicerPackage(servicer, default_timeout, maximum_timeout))
diff --git a/src/python/grpcio/grpc/framework/core/_expiration.py b/src/python/grpcio/grpc/framework/core/_expiration.py
deleted file mode 100644
index ded0ab6bce..0000000000
--- a/src/python/grpcio/grpc/framework/core/_expiration.py
+++ /dev/null
@@ -1,154 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for operation expiration."""
-
-import time
-
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _utilities
-from grpc.framework.foundation import later
-from grpc.framework.interfaces.base import base
-
-
-class _ExpirationManager(_interfaces.ExpirationManager):
-  """An implementation of _interfaces.ExpirationManager."""
-
-  def __init__(
-      self, commencement, timeout, maximum_timeout, lock, termination_manager,
-      transmission_manager):
-    """Constructor.
-
-    Args:
-      commencement: The time in seconds since the epoch at which the operation
-        began.
-      timeout: A length of time in seconds to allow for the operation to run.
-      maximum_timeout: The maximum length of time in seconds to allow for the
-        operation to run despite what is requested via this object's
-        change_timout method.
-      lock: The operation-wide lock.
-      termination_manager: The _interfaces.TerminationManager for the operation.
-      transmission_manager: The _interfaces.TransmissionManager for the
-        operation.
-    """
-    self._lock = lock
-    self._termination_manager = termination_manager
-    self._transmission_manager = transmission_manager
-    self._commencement = commencement
-    self._maximum_timeout = maximum_timeout
-
-    self._timeout = timeout
-    self._deadline = commencement + timeout
-    self._index = None
-    self._future = None
-
-  def _expire(self, index):
-    def expire():
-      with self._lock:
-        if self._future is not None and index == self._index:
-          self._future = None
-          self._termination_manager.expire()
-          self._transmission_manager.abort(
-              _utilities.Outcome(base.Outcome.Kind.EXPIRED, None, None))
-    return expire
-
-  def start(self):
-    self._index = 0
-    self._future = later.later(self._timeout, self._expire(0))
-
-  def change_timeout(self, timeout):
-    if self._future is not None and timeout != self._timeout:
-      self._future.cancel()
-      new_timeout = min(timeout, self._maximum_timeout)
-      new_index = self._index + 1
-      self._timeout = new_timeout
-      self._deadline = self._commencement + new_timeout
-      self._index = new_index
-      delay = self._deadline - time.time()
-      self._future = later.later(delay, self._expire(new_index))
-      if new_timeout != timeout:
-        self._transmission_manager.timeout(new_timeout)
-
-  def deadline(self):
-    return self._deadline
-
-  def terminate(self):
-    if self._future:
-      self._future.cancel()
-      self._future = None
-    self._deadline_index = None
-
-
-def invocation_expiration_manager(
-    timeout, lock, termination_manager, transmission_manager):
-  """Creates an _interfaces.ExpirationManager appropriate for front-side use.
-
-  Args:
-    timeout: A length of time in seconds to allow for the operation to run.
-    lock: The operation-wide lock.
-    termination_manager: The _interfaces.TerminationManager for the operation.
-    transmission_manager: The _interfaces.TransmissionManager for the
-      operation.
-
-  Returns:
-    An _interfaces.ExpirationManager appropriate for invocation-side use.
-  """
-  expiration_manager = _ExpirationManager(
-      time.time(), timeout, timeout, lock, termination_manager,
-      transmission_manager)
-  expiration_manager.start()
-  return expiration_manager
-
-
-def service_expiration_manager(
-    timeout, default_timeout, maximum_timeout, lock, termination_manager,
-    transmission_manager):
-  """Creates an _interfaces.ExpirationManager appropriate for back-side use.
-
-  Args:
-    timeout: A length of time in seconds to allow for the operation to run. May
-      be None in which case default_timeout will be used.
-    default_timeout: The default length of time in seconds to allow for the
-      operation to run if the front-side customer has not specified such a value
-      (or if the value they specified is not yet known).
-    maximum_timeout: The maximum length of time in seconds to allow for the
-      operation to run.
-    lock: The operation-wide lock.
-    termination_manager: The _interfaces.TerminationManager for the operation.
-    transmission_manager: The _interfaces.TransmissionManager for the
-      operation.
-
-  Returns:
-    An _interfaces.ExpirationManager appropriate for service-side use.
-  """
-  expiration_manager = _ExpirationManager(
-      time.time(), default_timeout if timeout is None else timeout,
-      maximum_timeout, lock, termination_manager, transmission_manager)
-  expiration_manager.start()
-  return expiration_manager
diff --git a/src/python/grpcio/grpc/framework/core/_ingestion.py b/src/python/grpcio/grpc/framework/core/_ingestion.py
deleted file mode 100644
index f2767c981b..0000000000
--- a/src/python/grpcio/grpc/framework/core/_ingestion.py
+++ /dev/null
@@ -1,439 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for ingestion during an operation."""
-
-import abc
-import collections
-import enum
-
-import six
-
-from grpc.framework.core import _constants
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _utilities
-from grpc.framework.foundation import abandonment
-from grpc.framework.foundation import callable_util
-from grpc.framework.interfaces.base import base
-
-_CREATE_SUBSCRIPTION_EXCEPTION_LOG_MESSAGE = 'Exception initializing ingestion!'
-_INGESTION_EXCEPTION_LOG_MESSAGE = 'Exception during ingestion!'
-
-
-class _SubscriptionCreation(
-    collections.namedtuple(
-        '_SubscriptionCreation',
-        ('kind', 'subscription', 'code', 'details',))):
-  """A sum type for the outcome of ingestion initialization.
-
-  Attributes:
-    kind: A Kind value coarsely indicating how subscription creation completed.
-    subscription: The created subscription. Only present if kind is
-      Kind.SUBSCRIPTION.
-    code: A code value to be sent to the other side of the operation along with
-      an indication that the operation is being aborted due to an error on the
-      remote side of the operation. Only present if kind is Kind.REMOTE_ERROR.
-    details: A details value to be sent to the other side of the operation
-      along with an indication that the operation is being aborted due to an
-      error on the remote side of the operation. Only present if kind is
-      Kind.REMOTE_ERROR.
-  """
-
-  @enum.unique
-  class Kind(enum.Enum):
-    SUBSCRIPTION = 'subscription'
-    REMOTE_ERROR = 'remote error'
-    ABANDONED = 'abandoned'
-
-
-class _SubscriptionCreator(six.with_metaclass(abc.ABCMeta)):
-  """Common specification of subscription-creating behavior."""
-
-  @abc.abstractmethod
-  def create(self, group, method):
-    """Creates the base.Subscription of the local customer.
-
-    Any exceptions raised by this method should be attributed to and treated as
-    defects in the customer code called by this method.
-
-    Args:
-      group: The group identifier of the operation.
-      method: The method identifier of the operation.
-
-    Returns:
-      A _SubscriptionCreation describing the result of subscription creation.
-    """
-    raise NotImplementedError()
-
-
-class _ServiceSubscriptionCreator(_SubscriptionCreator):
-  """A _SubscriptionCreator appropriate for service-side use."""
-
-  def __init__(self, servicer, operation_context, output_operator):
-    """Constructor.
-
-    Args:
-      servicer: The base.Servicer that will service the operation.
-      operation_context: A base.OperationContext for the operation to be passed
-        to the customer.
-      output_operator: A base.Operator for the operation to be passed to the
-        customer and to be called by the customer to accept operation data
-        emitted by the customer.
-    """
-    self._servicer = servicer
-    self._operation_context = operation_context
-    self._output_operator = output_operator
-
-  def create(self, group, method):
-    try:
-      subscription = self._servicer.service(
-          group, method, self._operation_context, self._output_operator)
-    except base.NoSuchMethodError as e:
-      return _SubscriptionCreation(
-          _SubscriptionCreation.Kind.REMOTE_ERROR, None, e.code, e.details)
-    except abandonment.Abandoned:
-      return _SubscriptionCreation(
-          _SubscriptionCreation.Kind.ABANDONED, None, None, None)
-    else:
-      return _SubscriptionCreation(
-          _SubscriptionCreation.Kind.SUBSCRIPTION, subscription, None, None)
-
-
-def _wrap(behavior):
-  def wrapped(*args, **kwargs):
-    try:
-      behavior(*args, **kwargs)
-    except abandonment.Abandoned:
-      return False
-    else:
-      return True
-  return wrapped
-
-
-class _IngestionManager(_interfaces.IngestionManager):
-  """An implementation of _interfaces.IngestionManager."""
-
-  def __init__(
-      self, lock, pool, subscription, subscription_creator, termination_manager,
-      transmission_manager, expiration_manager, protocol_manager):
-    """Constructor.
-
-    Args:
-      lock: The operation-wide lock.
-      pool: A thread pool in which to execute customer code.
-      subscription: A base.Subscription describing the customer's interest in
-        operation values from the other side. May be None if
-        subscription_creator is not None.
-      subscription_creator: A _SubscriptionCreator wrapping the portion of
-        customer code that when called returns the base.Subscription describing
-        the customer's interest in operation values from the other side. May be
-        None if subscription is not None.
-      termination_manager: The _interfaces.TerminationManager for the operation.
-      transmission_manager: The _interfaces.TransmissionManager for the
-        operation.
-      expiration_manager: The _interfaces.ExpirationManager for the operation.
-      protocol_manager: The _interfaces.ProtocolManager for the operation.
-    """
-    self._lock = lock
-    self._pool = pool
-    self._termination_manager = termination_manager
-    self._transmission_manager = transmission_manager
-    self._expiration_manager = expiration_manager
-    self._protocol_manager = protocol_manager
-
-    if subscription is None:
-      self._subscription_creator = subscription_creator
-      self._wrapped_operator = None
-    elif subscription.kind is base.Subscription.Kind.FULL:
-      self._subscription_creator = None
-      self._wrapped_operator = _wrap(subscription.operator.advance)
-    else:
-      # TODO(nathaniel): Support other subscriptions.
-      raise ValueError('Unsupported subscription "%s"!' % subscription.kind)
-    self._pending_initial_metadata = None
-    self._pending_payloads = []
-    self._pending_completion = None
-    self._local_allowance = 1
-    # A nonnegative integer or None, with None indicating that the local
-    # customer is done emitting anyway so there's no need to bother it by
-    # informing it that the remote customer has granted it further permission to
-    # emit.
-    self._remote_allowance = 0
-    self._processing = False
-
-  def _abort_internal_only(self):
-    self._subscription_creator = None
-    self._wrapped_operator = None
-    self._pending_initial_metadata = None
-    self._pending_payloads = None
-    self._pending_completion = None
-
-  def _abort_and_notify(self, outcome_kind, code, details):
-    self._abort_internal_only()
-    if self._termination_manager.outcome is None:
-      outcome = _utilities.Outcome(outcome_kind, code, details)
-      self._termination_manager.abort(outcome)
-      self._transmission_manager.abort(outcome)
-      self._expiration_manager.terminate()
-
-  def _operator_next(self):
-    """Computes the next step for full-subscription ingestion.
-
-    Returns:
-      An initial_metadata, payload, completion, allowance, continue quintet
-        indicating what operation values (if any) are available to pass into
-        customer code and whether or not there is anything immediately
-        actionable to call customer code to do.
-    """
-    if self._wrapped_operator is None:
-      return None, None, None, None, False
-    else:
-      initial_metadata, payload, completion, allowance, action = [None] * 5
-      if self._pending_initial_metadata is not None:
-        initial_metadata = self._pending_initial_metadata
-        self._pending_initial_metadata = None
-        action = True
-      if self._pending_payloads and 0 < self._local_allowance:
-        payload = self._pending_payloads.pop(0)
-        self._local_allowance -= 1
-        action = True
-      if not self._pending_payloads and self._pending_completion is not None:
-        completion = self._pending_completion
-        self._pending_completion = None
-        action = True
-      if self._remote_allowance is not None and 0 < self._remote_allowance:
-        allowance = self._remote_allowance
-        self._remote_allowance = 0
-        action = True
-      return initial_metadata, payload, completion, allowance, bool(action)
-
-  def _operator_process(
-      self, wrapped_operator, initial_metadata, payload,
-      completion, allowance):
-    while True:
-      advance_outcome = callable_util.call_logging_exceptions(
-          wrapped_operator, _INGESTION_EXCEPTION_LOG_MESSAGE,
-          initial_metadata=initial_metadata, payload=payload,
-          completion=completion, allowance=allowance)
-      if advance_outcome.exception is None:
-        if advance_outcome.return_value:
-          with self._lock:
-            if self._termination_manager.outcome is not None:
-              return
-            if completion is not None:
-              self._termination_manager.ingestion_complete()
-            initial_metadata, payload, completion, allowance, moar = (
-                self._operator_next())
-            if not moar:
-              self._processing = False
-              return
-        else:
-          with self._lock:
-            if self._termination_manager.outcome is None:
-              self._abort_and_notify(
-                  base.Outcome.Kind.LOCAL_FAILURE, None, None)
-            return
-      else:
-        with self._lock:
-          if self._termination_manager.outcome is None:
-            self._abort_and_notify(base.Outcome.Kind.LOCAL_FAILURE, None, None)
-          return
-
-  def _operator_post_create(self, subscription):
-    wrapped_operator = _wrap(subscription.operator.advance)
-    with self._lock:
-      if self._termination_manager.outcome is not None:
-        return
-      self._wrapped_operator = wrapped_operator
-      self._subscription_creator = None
-      metadata, payload, completion, allowance, moar = self._operator_next()
-      if not moar:
-        self._processing = False
-        return
-    self._operator_process(
-        wrapped_operator, metadata, payload, completion, allowance)
-
-  def _create(self, subscription_creator, group, name):
-    outcome = callable_util.call_logging_exceptions(
-        subscription_creator.create,
-        _CREATE_SUBSCRIPTION_EXCEPTION_LOG_MESSAGE, group, name)
-    if outcome.return_value is None:
-      with self._lock:
-        if self._termination_manager.outcome is None:
-          self._abort_and_notify(base.Outcome.Kind.LOCAL_FAILURE, None, None)
-    elif outcome.return_value.kind is _SubscriptionCreation.Kind.ABANDONED:
-      with self._lock:
-        if self._termination_manager.outcome is None:
-          self._abort_and_notify(base.Outcome.Kind.LOCAL_FAILURE, None, None)
-    elif outcome.return_value.kind is _SubscriptionCreation.Kind.REMOTE_ERROR:
-      code = outcome.return_value.code
-      details = outcome.return_value.details
-      with self._lock:
-        if self._termination_manager.outcome is None:
-          self._abort_and_notify(
-              base.Outcome.Kind.REMOTE_FAILURE, code, details)
-    elif outcome.return_value.subscription.kind is base.Subscription.Kind.FULL:
-      self._protocol_manager.set_protocol_receiver(
-          outcome.return_value.subscription.protocol_receiver)
-      self._operator_post_create(outcome.return_value.subscription)
-    else:
-      # TODO(nathaniel): Support other subscriptions.
-      raise ValueError(
-          'Unsupported "%s"!' % outcome.return_value.subscription.kind)
-
-  def _store_advance(self, initial_metadata, payload, completion, allowance):
-    if initial_metadata is not None:
-      self._pending_initial_metadata = initial_metadata
-    if payload is not None:
-      self._pending_payloads.append(payload)
-    if completion is not None:
-      self._pending_completion = completion
-    if allowance is not None and self._remote_allowance is not None:
-      self._remote_allowance += allowance
-
-  def _operator_advance(self, initial_metadata, payload, completion, allowance):
-    if self._processing:
-      self._store_advance(initial_metadata, payload, completion, allowance)
-    else:
-      action = False
-      if initial_metadata is not None:
-        action = True
-      if payload is not None:
-        if 0 < self._local_allowance:
-          self._local_allowance -= 1
-          action = True
-        else:
-          self._pending_payloads.append(payload)
-          payload = False
-      if completion is not None:
-        if self._pending_payloads:
-          self._pending_completion = completion
-        else:
-          action = True
-      if allowance is not None and self._remote_allowance is not None:
-        allowance += self._remote_allowance
-        self._remote_allowance = 0
-        action = True
-      if action:
-        self._pool.submit(
-            callable_util.with_exceptions_logged(
-                self._operator_process, _constants.INTERNAL_ERROR_LOG_MESSAGE),
-            self._wrapped_operator, initial_metadata, payload, completion,
-            allowance)
-
-  def set_group_and_method(self, group, method):
-    """See _interfaces.IngestionManager.set_group_and_method for spec."""
-    if self._subscription_creator is not None and not self._processing:
-      self._pool.submit(
-          callable_util.with_exceptions_logged(
-              self._create, _constants.INTERNAL_ERROR_LOG_MESSAGE),
-          self._subscription_creator, group, method)
-      self._processing = True
-
-  def add_local_allowance(self, allowance):
-    """See _interfaces.IngestionManager.add_local_allowance for spec."""
-    if any((self._subscription_creator, self._wrapped_operator,)):
-      self._local_allowance += allowance
-      if not self._processing:
-        initial_metadata, payload, completion, allowance, moar = (
-            self._operator_next())
-        if moar:
-          self._pool.submit(
-              callable_util.with_exceptions_logged(
-                  self._operator_process,
-                  _constants.INTERNAL_ERROR_LOG_MESSAGE),
-              initial_metadata, payload, completion, allowance)
-
-  def local_emissions_done(self):
-    self._remote_allowance = None
-
-  def advance(self, initial_metadata, payload, completion, allowance):
-    """See _interfaces.IngestionManager.advance for specification."""
-    if self._subscription_creator is not None:
-      self._store_advance(initial_metadata, payload, completion, allowance)
-    elif self._wrapped_operator is not None:
-      self._operator_advance(initial_metadata, payload, completion, allowance)
-
-
-def invocation_ingestion_manager(
-    subscription, lock, pool, termination_manager, transmission_manager,
-    expiration_manager, protocol_manager):
-  """Creates an IngestionManager appropriate for invocation-side use.
-
-  Args:
-    subscription: A base.Subscription indicating the customer's interest in the
-      data and results from the service-side of the operation.
-    lock: The operation-wide lock.
-    pool: A thread pool in which to execute customer code.
-    termination_manager: The _interfaces.TerminationManager for the operation.
-    transmission_manager: The _interfaces.TransmissionManager for the
-      operation.
-    expiration_manager: The _interfaces.ExpirationManager for the operation.
-    protocol_manager: The _interfaces.ProtocolManager for the operation.
-
-  Returns:
-    An IngestionManager appropriate for invocation-side use.
-  """
-  return _IngestionManager(
-      lock, pool, subscription, None, termination_manager, transmission_manager,
-      expiration_manager, protocol_manager)
-
-
-def service_ingestion_manager(
-    servicer, operation_context, output_operator, lock, pool,
-    termination_manager, transmission_manager, expiration_manager,
-    protocol_manager):
-  """Creates an IngestionManager appropriate for service-side use.
-
-  The returned IngestionManager will require its set_group_and_name method to be
-  called before its advance method may be called.
-
-  Args:
-    servicer: A base.Servicer for servicing the operation.
-    operation_context: A base.OperationContext for the operation to be passed to
-      the customer.
-    output_operator: A base.Operator for the operation to be passed to the
-      customer and to be called by the customer to accept operation data output
-      by the customer.
-    lock: The operation-wide lock.
-    pool: A thread pool in which to execute customer code.
-    termination_manager: The _interfaces.TerminationManager for the operation.
-    transmission_manager: The _interfaces.TransmissionManager for the
-      operation.
-    expiration_manager: The _interfaces.ExpirationManager for the operation.
-    protocol_manager: The _interfaces.ProtocolManager for the operation.
-
-  Returns:
-    An IngestionManager appropriate for service-side use.
-  """
-  subscription_creator = _ServiceSubscriptionCreator(
-      servicer, operation_context, output_operator)
-  return _IngestionManager(
-      lock, pool, None, subscription_creator, termination_manager,
-      transmission_manager, expiration_manager, protocol_manager)
diff --git a/src/python/grpcio/grpc/framework/core/_interfaces.py b/src/python/grpcio/grpc/framework/core/_interfaces.py
deleted file mode 100644
index 63ac82f80e..0000000000
--- a/src/python/grpcio/grpc/framework/core/_interfaces.py
+++ /dev/null
@@ -1,331 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Package-internal interfaces."""
-
-import abc
-
-import six
-
-from grpc.framework.interfaces.base import base
-
-
-class TerminationManager(six.with_metaclass(abc.ABCMeta)):
-  """An object responsible for handling the termination of an operation.
-
-  Attributes:
-    outcome: None if the operation is active or a base.Outcome value if it has
-      terminated.
-  """
-
-  @abc.abstractmethod
-  def add_callback(self, callback):
-    """Registers a callback to be called on operation termination.
-
-    If the operation has already terminated the callback will not be called.
-
-    Args:
-      callback: A callable that will be passed a base.Outcome value.
-
-    Returns:
-      None if the operation has not yet terminated and the passed callback will
-        be called when it does, or a base.Outcome value describing the
-        operation termination if the operation has terminated and the callback
-        will not be called as a result of this method call.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def emission_complete(self):
-    """Indicates that emissions from customer code have completed."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def transmission_complete(self):
-    """Indicates that transmissions to the remote end are complete.
-
-    Returns:
-      True if the operation has terminated or False if the operation remains
-        ongoing.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def reception_complete(self, code, details):
-    """Indicates that reception from the other side is complete.
-
-    Args:
-      code: An application-specific code value.
-      details: An application-specific details value.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def ingestion_complete(self):
-    """Indicates that customer code ingestion of received values is complete."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def expire(self):
-    """Indicates that the operation must abort because it has taken too long."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def abort(self, outcome):
-    """Indicates that the operation must abort for the indicated reason.
-
-    Args:
-      outcome: A base.Outcome indicating operation abortion.
-    """
-    raise NotImplementedError()
-
-
-class TransmissionManager(six.with_metaclass(abc.ABCMeta)):
-  """A manager responsible for transmitting to the other end of an operation."""
-
-  @abc.abstractmethod
-  def kick_off(
-      self, group, method, timeout, protocol_options, initial_metadata,
-      payload, completion, allowance):
-    """Transmits the values associated with operation invocation."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def advance(self, initial_metadata, payload, completion, allowance):
-    """Accepts values for transmission to the other end of the operation.
-
-    Args:
-      initial_metadata: An initial metadata value to be transmitted to the other
-        side of the operation. May only ever be non-None once.
-      payload: A payload value.
-      completion: A base.Completion value. May only ever be non-None in the last
-        transmission to be made to the other side.
-      allowance: A positive integer communicating the number of additional
-        payloads allowed to be transmitted from the other side to this side of
-        the operation, or None if no additional allowance is being granted in
-        this call.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def timeout(self, timeout):
-    """Accepts for transmission to the other side a new timeout value.
-
-    Args:
-      timeout: A positive float used as the new timeout value for the operation
-        to be transmitted to the other side.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def allowance(self, allowance):
-    """Indicates to this manager that the remote customer is allowing payloads.
-
-    Args:
-      allowance: A positive integer indicating the number of additional payloads
-        the remote customer is allowing to be transmitted from this side of the
-        operation.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def remote_complete(self):
-    """Indicates to this manager that data from the remote side is complete."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def abort(self, outcome):
-    """Indicates that the operation has aborted.
-
-    Args:
-      outcome: A base.Outcome for the operation. If None, indicates that the
-        operation abortion should not be communicated to the other side of the
-        operation.
-    """
-    raise NotImplementedError()
-
-
-class ExpirationManager(six.with_metaclass(abc.ABCMeta)):
-  """A manager responsible for aborting the operation if it runs out of time."""
-
-  @abc.abstractmethod
-  def change_timeout(self, timeout):
-    """Changes the timeout allotted for the operation.
-
-    Operation duration is always measure from the beginning of the operation;
-    calling this method changes the operation's allotted time to timeout total
-    seconds, not timeout seconds from the time of this method call.
-
-    Args:
-      timeout: A length of time in seconds to allow for the operation.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def deadline(self):
-    """Returns the time until which the operation is allowed to run.
-
-    Returns:
-      The time (seconds since the epoch) at which the operation will expire.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def terminate(self):
-    """Indicates to this manager that the operation has terminated."""
-    raise NotImplementedError()
-
-
-class ProtocolManager(six.with_metaclass(abc.ABCMeta)):
-  """A manager of protocol-specific values passing through an operation."""
-
-  @abc.abstractmethod
-  def set_protocol_receiver(self, protocol_receiver):
-    """Registers the customer object that will receive protocol objects.
-
-    Args:
-      protocol_receiver: A base.ProtocolReceiver to which protocol objects for
-        the operation should be passed.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def accept_protocol_context(self, protocol_context):
-    """Accepts the protocol context object for the operation.
-
-    Args:
-      protocol_context: An object designated for use as the protocol context
-        of the operation, with further semantics implementation-determined.
-    """
-    raise NotImplementedError()
-
-
-class EmissionManager(six.with_metaclass(abc.ABCMeta, base.Operator)):
-  """A manager of values emitted by customer code."""
-
-  @abc.abstractmethod
-  def advance(
-      self, initial_metadata=None, payload=None, completion=None,
-      allowance=None):
-    """Accepts a value emitted by customer code.
-
-    This method should only be called by customer code.
-
-    Args:
-      initial_metadata: An initial metadata value emitted by the local customer
-        to be sent to the other side of the operation.
-      payload: A payload value emitted by the local customer to be sent to the
-        other side of the operation.
-      completion: A Completion value emitted by the local customer to be sent to
-        the other side of the operation.
-      allowance: A positive integer indicating an additional number of payloads
-        that the local customer is willing to accept from the other side of the
-        operation.
-    """
-    raise NotImplementedError()
-
-
-class IngestionManager(six.with_metaclass(abc.ABCMeta)):
-  """A manager responsible for executing customer code.
-
-  This name of this manager comes from its responsibility to pass successive
-  values from the other side of the operation into the code of the local
-  customer.
-  """
-
-  @abc.abstractmethod
-  def set_group_and_method(self, group, method):
-    """Communicates to this IngestionManager the operation group and method.
-
-    Args:
-      group: The group identifier of the operation.
-      method: The method identifier of the operation.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def add_local_allowance(self, allowance):
-    """Communicates to this IngestionManager that more payloads may be ingested.
-
-    Args:
-      allowance: A positive integer indicating an additional number of payloads
-        that the local customer is willing to ingest.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def local_emissions_done(self):
-    """Indicates to this manager that local emissions are done."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def advance(self, initial_metadata, payload, completion, allowance):
-    """Advances the operation by passing values to the local customer."""
-    raise NotImplementedError()
-
-
-class ReceptionManager(six.with_metaclass(abc.ABCMeta)):
-  """A manager responsible for receiving tickets from the other end."""
-
-  @abc.abstractmethod
-  def receive_ticket(self, ticket):
-    """Handle a ticket from the other side of the operation.
-
-    Args:
-      ticket: A links.Ticket for the operation.
-    """
-    raise NotImplementedError()
-
-
-class Operation(six.with_metaclass(abc.ABCMeta)):
-  """An ongoing operation.
-
-  Attributes:
-    context: A base.OperationContext object for the operation.
-    operator: A base.Operator object for the operation for use by the customer
-      of the operation.
-  """
-
-  @abc.abstractmethod
-  def handle_ticket(self, ticket):
-    """Handle a ticket from the other side of the operation.
-
-    Args:
-      ticket: A links.Ticket from the other side of the operation.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def abort(self, outcome_kind):
-    """Aborts the operation.
-
-    Args:
-      outcome_kind: A base.Outcome.Kind value indicating operation abortion.
-    """
-    raise NotImplementedError()
diff --git a/src/python/grpcio/grpc/framework/core/_operation.py b/src/python/grpcio/grpc/framework/core/_operation.py
deleted file mode 100644
index 020c0c9ed9..0000000000
--- a/src/python/grpcio/grpc/framework/core/_operation.py
+++ /dev/null
@@ -1,204 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Implementation of operations."""
-
-import threading
-
-from grpc.framework.core import _context
-from grpc.framework.core import _emission
-from grpc.framework.core import _expiration
-from grpc.framework.core import _ingestion
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _protocol
-from grpc.framework.core import _reception
-from grpc.framework.core import _termination
-from grpc.framework.core import _transmission
-from grpc.framework.core import _utilities
-
-
-class _EasyOperation(_interfaces.Operation):
-  """A trivial implementation of interfaces.Operation."""
-
-  def __init__(
-      self, lock, termination_manager, transmission_manager, expiration_manager,
-      context, operator, reception_manager):
-    """Constructor.
-
-    Args:
-      lock: The operation-wide lock.
-      termination_manager: The _interfaces.TerminationManager for the operation.
-      transmission_manager: The _interfaces.TransmissionManager for the
-        operation.
-      expiration_manager: The _interfaces.ExpirationManager for the operation.
-      context: A base.OperationContext for use by the customer during the
-        operation.
-      operator: A base.Operator for use by the customer during the operation.
-      reception_manager: The _interfaces.ReceptionManager for the operation.
-    """
-    self._lock = lock
-    self._termination_manager = termination_manager
-    self._transmission_manager = transmission_manager
-    self._expiration_manager = expiration_manager
-    self._reception_manager = reception_manager
-
-    self.context = context
-    self.operator = operator
-
-  def handle_ticket(self, ticket):
-    with self._lock:
-      self._reception_manager.receive_ticket(ticket)
-
-  def abort(self, outcome_kind):
-    with self._lock:
-      if self._termination_manager.outcome is None:
-        outcome = _utilities.Outcome(outcome_kind, None, None)
-        self._termination_manager.abort(outcome)
-        self._transmission_manager.abort(outcome)
-        self._expiration_manager.terminate()
-
-
-def invocation_operate(
-    operation_id, group, method, subscription, timeout, protocol_options,
-    initial_metadata, payload, completion, ticket_sink, termination_action,
-    pool):
-  """Constructs objects necessary for front-side operation management.
-
-  Args:
-    operation_id: An object identifying the operation.
-    group: The group identifier of the operation.
-    method: The method identifier of the operation.
-    subscription: A base.Subscription describing the customer's interest in the
-      results of the operation.
-    timeout: A length of time in seconds to allow for the operation.
-    protocol_options: A transport-specific, application-specific, and/or
-      protocol-specific value relating to the invocation. May be None.
-    initial_metadata: An initial metadata value to be sent to the other side of
-      the operation. May be None if the initial metadata will be passed later or
-      if there will be no initial metadata passed at all.
-    payload: The first payload value to be transmitted to the other side. May be
-      None if there is no such value or if the customer chose not to pass it at
-      operation invocation.
-    completion: A base.Completion value indicating the end of values passed to
-      the other side of the operation.
-    ticket_sink: A callable that accepts links.Tickets and delivers them to the
-      other side of the operation.
-    termination_action: A callable that accepts the outcome of the operation as
-      a base.Outcome value to be called on operation completion.
-    pool: A thread pool with which to do the work of the operation.
-
-  Returns:
-    An _interfaces.Operation for the operation.
-  """
-  lock = threading.Lock()
-  with lock:
-    termination_manager = _termination.invocation_termination_manager(
-        termination_action, pool)
-    transmission_manager = _transmission.TransmissionManager(
-        operation_id, ticket_sink, lock, pool, termination_manager)
-    expiration_manager = _expiration.invocation_expiration_manager(
-        timeout, lock, termination_manager, transmission_manager)
-    protocol_manager = _protocol.invocation_protocol_manager(
-        subscription, lock, pool, termination_manager, transmission_manager,
-        expiration_manager)
-    operation_context = _context.OperationContext(
-        lock, termination_manager, transmission_manager, expiration_manager)
-    emission_manager = _emission.EmissionManager(
-        lock, termination_manager, transmission_manager, expiration_manager)
-    ingestion_manager = _ingestion.invocation_ingestion_manager(
-        subscription, lock, pool, termination_manager, transmission_manager,
-        expiration_manager, protocol_manager)
-    reception_manager = _reception.ReceptionManager(
-        termination_manager, transmission_manager, expiration_manager,
-        protocol_manager, ingestion_manager)
-
-    termination_manager.set_expiration_manager(expiration_manager)
-    transmission_manager.set_expiration_manager(expiration_manager)
-    emission_manager.set_ingestion_manager(ingestion_manager)
-
-    transmission_manager.kick_off(
-        group, method, timeout, protocol_options, initial_metadata, payload,
-        completion, None)
-
-  return _EasyOperation(
-      lock, termination_manager, transmission_manager, expiration_manager,
-      operation_context, emission_manager, reception_manager)
-
-
-def service_operate(
-    servicer_package, ticket, ticket_sink, termination_action, pool):
-  """Constructs an Operation for service of an operation.
-
-  Args:
-    servicer_package: A _utilities.ServicerPackage to be used servicing the
-      operation.
-    ticket: The first links.Ticket received for the operation.
-    ticket_sink: A callable that accepts links.Tickets and delivers them to the
-      other side of the operation.
-    termination_action: A callable that accepts the outcome of the operation as
-      a base.Outcome value to be called on operation completion.
-    pool: A thread pool with which to do the work of the operation.
-
-  Returns:
-    An _interfaces.Operation for the operation.
-  """
-  lock = threading.Lock()
-  with lock:
-    termination_manager = _termination.service_termination_manager(
-        termination_action, pool)
-    transmission_manager = _transmission.TransmissionManager(
-        ticket.operation_id, ticket_sink, lock, pool, termination_manager)
-    expiration_manager = _expiration.service_expiration_manager(
-        ticket.timeout, servicer_package.default_timeout,
-        servicer_package.maximum_timeout, lock, termination_manager,
-        transmission_manager)
-    protocol_manager = _protocol.service_protocol_manager(
-        lock, pool, termination_manager, transmission_manager,
-        expiration_manager)
-    operation_context = _context.OperationContext(
-        lock, termination_manager, transmission_manager, expiration_manager)
-    emission_manager = _emission.EmissionManager(
-        lock, termination_manager, transmission_manager, expiration_manager)
-    ingestion_manager = _ingestion.service_ingestion_manager(
-        servicer_package.servicer, operation_context, emission_manager, lock,
-        pool, termination_manager, transmission_manager, expiration_manager,
-        protocol_manager)
-    reception_manager = _reception.ReceptionManager(
-        termination_manager, transmission_manager, expiration_manager,
-        protocol_manager, ingestion_manager)
-
-    termination_manager.set_expiration_manager(expiration_manager)
-    transmission_manager.set_expiration_manager(expiration_manager)
-    emission_manager.set_ingestion_manager(ingestion_manager)
-
-    reception_manager.receive_ticket(ticket)
-
-  return _EasyOperation(
-      lock, termination_manager, transmission_manager, expiration_manager,
-      operation_context, emission_manager, reception_manager)
diff --git a/src/python/grpcio/grpc/framework/core/_protocol.py b/src/python/grpcio/grpc/framework/core/_protocol.py
deleted file mode 100644
index 3177b5e302..0000000000
--- a/src/python/grpcio/grpc/framework/core/_protocol.py
+++ /dev/null
@@ -1,176 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for passing protocol objects in an operation."""
-
-import collections
-import enum
-
-from grpc.framework.core import _constants
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _utilities
-from grpc.framework.foundation import callable_util
-from grpc.framework.interfaces.base import base
-
-_EXCEPTION_LOG_MESSAGE = 'Exception delivering protocol object!'
-
-_LOCAL_FAILURE_OUTCOME = _utilities.Outcome(
-    base.Outcome.Kind.LOCAL_FAILURE, None, None)
-
-
-class _Awaited(
-    collections.namedtuple('_Awaited', ('kind', 'value',))):
-
-  @enum.unique
-  class Kind(enum.Enum):
-    NOT_YET_ARRIVED = 'not yet arrived'
-    ARRIVED = 'arrived'
-
-_NOT_YET_ARRIVED = _Awaited(_Awaited.Kind.NOT_YET_ARRIVED, None)
-_ARRIVED_AND_NONE = _Awaited(_Awaited.Kind.ARRIVED, None)
-
-
-class _Transitory(
-    collections.namedtuple('_Transitory', ('kind', 'value',))):
-
-  @enum.unique
-  class Kind(enum.Enum):
-    NOT_YET_SEEN = 'not yet seen'
-    PRESENT = 'present'
-    GONE = 'gone'
-
-_NOT_YET_SEEN = _Transitory(_Transitory.Kind.NOT_YET_SEEN, None)
-_GONE = _Transitory(_Transitory.Kind.GONE, None)
-
-
-class _ProtocolManager(_interfaces.ProtocolManager):
-  """An implementation of _interfaces.ExpirationManager."""
-
-  def __init__(
-      self, protocol_receiver, lock, pool, termination_manager,
-      transmission_manager, expiration_manager):
-    """Constructor.
-
-    Args:
-      protocol_receiver: An _Awaited wrapping of the base.ProtocolReceiver to
-        which protocol objects should be passed during the operation. May be
-        of kind _Awaited.Kind.NOT_YET_ARRIVED if the customer's subscription is
-        not yet known and may be of kind _Awaited.Kind.ARRIVED but with a value
-        of None if the customer's subscription did not include a
-        ProtocolReceiver.
-      lock: The operation-wide lock.
-      pool: A thread pool.
-      termination_manager: The _interfaces.TerminationManager for the operation.
-      transmission_manager: The _interfaces.TransmissionManager for the
-        operation.
-      expiration_manager: The _interfaces.ExpirationManager for the operation.
-    """
-    self._lock = lock
-    self._pool = pool
-    self._termination_manager = termination_manager
-    self._transmission_manager = transmission_manager
-    self._expiration_manager = expiration_manager
-
-    self._protocol_receiver = protocol_receiver
-    self._context = _NOT_YET_SEEN
-
-  def _abort_and_notify(self, outcome):
-    if self._termination_manager.outcome is None:
-      self._termination_manager.abort(outcome)
-      self._transmission_manager.abort(outcome)
-      self._expiration_manager.terminate()
-
-  def _deliver(self, behavior, value):
-    def deliver():
-      delivery_outcome = callable_util.call_logging_exceptions(
-          behavior, _EXCEPTION_LOG_MESSAGE, value)
-      if delivery_outcome.kind is callable_util.Outcome.Kind.RAISED:
-        with self._lock:
-          self._abort_and_notify(_LOCAL_FAILURE_OUTCOME)
-    self._pool.submit(
-        callable_util.with_exceptions_logged(
-            deliver, _constants.INTERNAL_ERROR_LOG_MESSAGE))
-
-  def set_protocol_receiver(self, protocol_receiver):
-    """See _interfaces.ProtocolManager.set_protocol_receiver for spec."""
-    self._protocol_receiver = _Awaited(_Awaited.Kind.ARRIVED, protocol_receiver)
-    if (self._context.kind is _Transitory.Kind.PRESENT and
-        protocol_receiver is not None):
-      self._deliver(protocol_receiver.context, self._context.value)
-      self._context = _GONE
-
-  def accept_protocol_context(self, protocol_context):
-    """See _interfaces.ProtocolManager.accept_protocol_context for spec."""
-    if self._protocol_receiver.kind is _Awaited.Kind.ARRIVED:
-      if self._protocol_receiver.value is not None:
-        self._deliver(self._protocol_receiver.value.context, protocol_context)
-      self._context = _GONE
-    else:
-      self._context = _Transitory(_Transitory.Kind.PRESENT, protocol_context)
-
-
-def invocation_protocol_manager(
-    subscription, lock, pool, termination_manager, transmission_manager,
-    expiration_manager):
-  """Creates an _interfaces.ProtocolManager for invocation-side use.
-
-  Args:
-    subscription: The local customer's subscription to the operation.
-    lock: The operation-wide lock.
-    pool: A thread pool.
-    termination_manager: The _interfaces.TerminationManager for the operation.
-    transmission_manager: The _interfaces.TransmissionManager for the
-      operation.
-    expiration_manager: The _interfaces.ExpirationManager for the operation.
-  """
-  if subscription.kind is base.Subscription.Kind.FULL:
-    awaited_protocol_receiver = _Awaited(
-        _Awaited.Kind.ARRIVED, subscription.protocol_receiver)
-  else:
-    awaited_protocol_receiver = _ARRIVED_AND_NONE
-  return _ProtocolManager(
-      awaited_protocol_receiver, lock, pool, termination_manager,
-      transmission_manager, expiration_manager)
-
-
-def service_protocol_manager(
-    lock, pool, termination_manager, transmission_manager, expiration_manager):
-  """Creates an _interfaces.ProtocolManager for service-side use.
-
-  Args:
-    lock: The operation-wide lock.
-    pool: A thread pool.
-    termination_manager: The _interfaces.TerminationManager for the operation.
-    transmission_manager: The _interfaces.TransmissionManager for the
-      operation.
-    expiration_manager: The _interfaces.ExpirationManager for the operation.
-  """
-  return _ProtocolManager(
-      _NOT_YET_ARRIVED, lock, pool, termination_manager, transmission_manager,
-      expiration_manager)
diff --git a/src/python/grpcio/grpc/framework/core/_reception.py b/src/python/grpcio/grpc/framework/core/_reception.py
deleted file mode 100644
index ff81450dee..0000000000
--- a/src/python/grpcio/grpc/framework/core/_reception.py
+++ /dev/null
@@ -1,159 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for ticket reception."""
-
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _utilities
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.base import utilities
-from grpc.framework.interfaces.links import links
-
-_REMOTE_TICKET_TERMINATION_TO_LOCAL_OUTCOME_KIND = {
-    links.Ticket.Termination.CANCELLATION: base.Outcome.Kind.CANCELLED,
-    links.Ticket.Termination.EXPIRATION: base.Outcome.Kind.EXPIRED,
-    links.Ticket.Termination.SHUTDOWN: base.Outcome.Kind.REMOTE_SHUTDOWN,
-    links.Ticket.Termination.RECEPTION_FAILURE:
-        base.Outcome.Kind.RECEPTION_FAILURE,
-    links.Ticket.Termination.TRANSMISSION_FAILURE:
-        base.Outcome.Kind.TRANSMISSION_FAILURE,
-    links.Ticket.Termination.LOCAL_FAILURE: base.Outcome.Kind.REMOTE_FAILURE,
-    links.Ticket.Termination.REMOTE_FAILURE: base.Outcome.Kind.LOCAL_FAILURE,
-}
-
-_RECEPTION_FAILURE_OUTCOME = _utilities.Outcome(
-    base.Outcome.Kind.RECEPTION_FAILURE, None, None)
-
-
-def _carrying_protocol_context(ticket):
-  return ticket.protocol is not None and ticket.protocol.kind in (
-      links.Protocol.Kind.INVOCATION_CONTEXT,
-      links.Protocol.Kind.SERVICER_CONTEXT,)
-
-
-class ReceptionManager(_interfaces.ReceptionManager):
-  """A ReceptionManager based around a _Receiver passed to it."""
-
-  def __init__(
-      self, termination_manager, transmission_manager, expiration_manager,
-      protocol_manager, ingestion_manager):
-    """Constructor.
-
-    Args:
-      termination_manager: The operation's _interfaces.TerminationManager.
-      transmission_manager: The operation's _interfaces.TransmissionManager.
-      expiration_manager: The operation's _interfaces.ExpirationManager.
-      protocol_manager: The operation's _interfaces.ProtocolManager.
-      ingestion_manager: The operation's _interfaces.IngestionManager.
-    """
-    self._termination_manager = termination_manager
-    self._transmission_manager = transmission_manager
-    self._expiration_manager = expiration_manager
-    self._protocol_manager = protocol_manager
-    self._ingestion_manager = ingestion_manager
-
-    self._lowest_unseen_sequence_number = 0
-    self._out_of_sequence_tickets = {}
-    self._aborted = False
-
-  def _abort(self, outcome):
-    self._aborted = True
-    if self._termination_manager.outcome is None:
-      self._termination_manager.abort(outcome)
-      self._transmission_manager.abort(None)
-      self._expiration_manager.terminate()
-
-  def _sequence_failure(self, ticket):
-    """Determines a just-arrived ticket's sequential legitimacy.
-
-    Args:
-      ticket: A just-arrived ticket.
-
-    Returns:
-      True if the ticket is sequentially legitimate; False otherwise.
-    """
-    if ticket.sequence_number < self._lowest_unseen_sequence_number:
-      return True
-    elif ticket.sequence_number in self._out_of_sequence_tickets:
-      return True
-    else:
-      return False
-
-  def _process_one(self, ticket):
-    if ticket.sequence_number == 0:
-      self._ingestion_manager.set_group_and_method(ticket.group, ticket.method)
-      if _carrying_protocol_context(ticket):
-        self._protocol_manager.accept_protocol_context(ticket.protocol.value)
-      else:
-        self._protocol_manager.accept_protocol_context(None)
-    if ticket.timeout is not None:
-      self._expiration_manager.change_timeout(ticket.timeout)
-    if ticket.termination is None:
-      completion = None
-    else:
-      completion = utilities.completion(
-          ticket.terminal_metadata, ticket.code, ticket.message)
-      self._termination_manager.reception_complete(ticket.code, ticket.message)
-    self._ingestion_manager.advance(
-        ticket.initial_metadata, ticket.payload, completion, ticket.allowance)
-    if ticket.allowance is not None:
-      self._transmission_manager.allowance(ticket.allowance)
-
-  def _process(self, ticket):
-    """Process those tickets ready to be processed.
-
-    Args:
-      ticket: A just-arrived ticket the sequence number of which matches this
-        _ReceptionManager's _lowest_unseen_sequence_number field.
-    """
-    while True:
-      self._process_one(ticket)
-      next_ticket = self._out_of_sequence_tickets.pop(
-          ticket.sequence_number + 1, None)
-      if next_ticket is None:
-        self._lowest_unseen_sequence_number = ticket.sequence_number + 1
-        return
-      else:
-        ticket = next_ticket
-
-  def receive_ticket(self, ticket):
-    """See _interfaces.ReceptionManager.receive_ticket for specification."""
-    if self._aborted:
-      return
-    elif self._sequence_failure(ticket):
-      self._abort(_RECEPTION_FAILURE_OUTCOME)
-    elif ticket.termination not in (None, links.Ticket.Termination.COMPLETION):
-      outcome_kind = _REMOTE_TICKET_TERMINATION_TO_LOCAL_OUTCOME_KIND[
-          ticket.termination]
-      self._abort(
-          _utilities.Outcome(outcome_kind, ticket.code, ticket.message))
-    elif ticket.sequence_number == self._lowest_unseen_sequence_number:
-      self._process(ticket)
-    else:
-      self._out_of_sequence_tickets[ticket.sequence_number] = ticket
diff --git a/src/python/grpcio/grpc/framework/core/_termination.py b/src/python/grpcio/grpc/framework/core/_termination.py
deleted file mode 100644
index fff3a3fc14..0000000000
--- a/src/python/grpcio/grpc/framework/core/_termination.py
+++ /dev/null
@@ -1,229 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for operation termination."""
-
-import abc
-
-import six
-
-from grpc.framework.core import _constants
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _utilities
-from grpc.framework.foundation import callable_util
-from grpc.framework.interfaces.base import base
-
-
-def _invocation_completion_predicate(
-    unused_emission_complete, unused_transmission_complete,
-    unused_reception_complete, ingestion_complete):
-  return ingestion_complete
-
-
-def _service_completion_predicate(
-    unused_emission_complete, transmission_complete, unused_reception_complete,
-    ingestion_complete):
-  return transmission_complete and ingestion_complete
-
-
-class TerminationManager(six.with_metaclass(abc.ABCMeta, _interfaces.TerminationManager)):
-  """A _interfaces.TransmissionManager on which another manager may be set."""
-
-  @abc.abstractmethod
-  def set_expiration_manager(self, expiration_manager):
-    """Sets the expiration manager with which this manager will interact.
-
-    Args:
-      expiration_manager: The _interfaces.ExpirationManager associated with the
-        current operation.
-    """
-    raise NotImplementedError()
-
-
-class _TerminationManager(TerminationManager):
-  """An implementation of TerminationManager."""
-
-  def __init__(self, predicate, action, pool):
-    """Constructor.
-
-    Args:
-      predicate: One of _invocation_completion_predicate or
-        _service_completion_predicate to be used to determine when the operation
-        has completed.
-      action: A behavior to pass the operation outcome's kind on operation
-        termination.
-      pool: A thread pool.
-    """
-    self._predicate = predicate
-    self._action = action
-    self._pool = pool
-    self._expiration_manager = None
-
-    self._callbacks = []
-
-    self._code = None
-    self._details = None
-    self._emission_complete = False
-    self._transmission_complete = False
-    self._reception_complete = False
-    self._ingestion_complete = False
-
-    # The None-ness of outcome is the operation-wide record of whether and how
-    # the operation has terminated.
-    self.outcome = None
-
-  def set_expiration_manager(self, expiration_manager):
-    self._expiration_manager = expiration_manager
-
-  def _terminate_internal_only(self, outcome):
-    """Terminates the operation.
-
-    Args:
-      outcome: A base.Outcome describing the outcome of the operation.
-    """
-    self.outcome = outcome
-    callbacks = list(self._callbacks)
-    self._callbacks = None
-
-    act = callable_util.with_exceptions_logged(
-        self._action, _constants.INTERNAL_ERROR_LOG_MESSAGE)
-
-    # TODO(issue 3202): Don't call the local application's callbacks if it has
-    # previously shown a programming defect.
-    if False and outcome.kind is base.Outcome.Kind.LOCAL_FAILURE:
-      self._pool.submit(act, base.Outcome.Kind.LOCAL_FAILURE)
-    else:
-      def call_callbacks_and_act(callbacks, outcome):
-        for callback in callbacks:
-          callback_outcome = callable_util.call_logging_exceptions(
-              callback, _constants.TERMINATION_CALLBACK_EXCEPTION_LOG_MESSAGE,
-              outcome)
-          if callback_outcome.exception is not None:
-            act_outcome_kind = base.Outcome.Kind.LOCAL_FAILURE
-            break
-        else:
-          act_outcome_kind = outcome.kind
-        act(act_outcome_kind)
-
-      self._pool.submit(
-          callable_util.with_exceptions_logged(
-              call_callbacks_and_act, _constants.INTERNAL_ERROR_LOG_MESSAGE),
-          callbacks, outcome)
-
-  def _terminate_and_notify(self, outcome):
-    self._terminate_internal_only(outcome)
-    self._expiration_manager.terminate()
-
-  def _perhaps_complete(self):
-    if self._predicate(
-        self._emission_complete, self._transmission_complete,
-        self._reception_complete, self._ingestion_complete):
-      self._terminate_and_notify(
-          _utilities.Outcome(
-              base.Outcome.Kind.COMPLETED, self._code, self._details))
-      return True
-    else:
-      return False
-
-  def is_active(self):
-    """See _interfaces.TerminationManager.is_active for specification."""
-    return self.outcome is None
-
-  def add_callback(self, callback):
-    """See _interfaces.TerminationManager.add_callback for specification."""
-    if self.outcome is None:
-      self._callbacks.append(callback)
-      return None
-    else:
-      return self.outcome
-
-  def emission_complete(self):
-    """See superclass method for specification."""
-    if self.outcome is None:
-      self._emission_complete = True
-      self._perhaps_complete()
-
-  def transmission_complete(self):
-    """See superclass method for specification."""
-    if self.outcome is None:
-      self._transmission_complete = True
-      return self._perhaps_complete()
-    else:
-      return False
-
-  def reception_complete(self, code, details):
-    """See superclass method for specification."""
-    if self.outcome is None:
-      self._reception_complete = True
-      self._code = code
-      self._details = details
-      self._perhaps_complete()
-
-  def ingestion_complete(self):
-    """See superclass method for specification."""
-    if self.outcome is None:
-      self._ingestion_complete = True
-      self._perhaps_complete()
-
-  def expire(self):
-    """See _interfaces.TerminationManager.expire for specification."""
-    self._terminate_internal_only(
-        _utilities.Outcome(base.Outcome.Kind.EXPIRED, None, None))
-
-  def abort(self, outcome):
-    """See _interfaces.TerminationManager.abort for specification."""
-    self._terminate_and_notify(outcome)
-
-
-def invocation_termination_manager(action, pool):
-  """Creates a TerminationManager appropriate for invocation-side use.
-
-  Args:
-    action: An action to call on operation termination.
-    pool: A thread pool in which to execute the passed action and any
-      termination callbacks that are registered during the operation.
-
-  Returns:
-    A TerminationManager appropriate for invocation-side use.
-  """
-  return _TerminationManager(_invocation_completion_predicate, action, pool)
-
-
-def service_termination_manager(action, pool):
-  """Creates a TerminationManager appropriate for service-side use.
-
-  Args:
-    action: An action to call on operation termination.
-    pool: A thread pool in which to execute the passed action and any
-      termination callbacks that are registered during the operation.
-
-  Returns:
-    A TerminationManager appropriate for service-side use.
-  """
-  return _TerminationManager(_service_completion_predicate, action, pool)
diff --git a/src/python/grpcio/grpc/framework/core/_transmission.py b/src/python/grpcio/grpc/framework/core/_transmission.py
deleted file mode 100644
index 65b12c4160..0000000000
--- a/src/python/grpcio/grpc/framework/core/_transmission.py
+++ /dev/null
@@ -1,335 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for ticket transmission during an operation."""
-
-import collections
-import enum
-
-from grpc.framework.core import _constants
-from grpc.framework.core import _interfaces
-from grpc.framework.core import _utilities
-from grpc.framework.foundation import callable_util
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.links import links
-
-_TRANSMISSION_EXCEPTION_LOG_MESSAGE = 'Exception during transmission!'
-
-_TRANSMISSION_FAILURE_OUTCOME = _utilities.Outcome(
-    base.Outcome.Kind.TRANSMISSION_FAILURE, None, None)
-
-
-def _explode_completion(completion):
-  if completion is None:
-    return None, None, None, None
-  else:
-    return (
-        completion.terminal_metadata, completion.code, completion.message,
-        links.Ticket.Termination.COMPLETION)
-
-
-class _Abort(
-    collections.namedtuple(
-        '_Abort', ('kind', 'termination', 'code', 'details',))):
-  """Tracks whether the operation aborted and what is to be done about it.
-
-  Attributes:
-    kind: A Kind value describing the overall kind of the _Abort.
-    termination: A links.Ticket.Termination value to be sent to the other side
-      of the operation. Only valid if kind is Kind.ABORTED_NOTIFY_NEEDED.
-    code: A code value to be sent to the other side of the operation. Only
-      valid if kind is Kind.ABORTED_NOTIFY_NEEDED.
-    details: A details value to be sent to the other side of the operation.
-      Only valid if kind is Kind.ABORTED_NOTIFY_NEEDED.
-  """
-
-  @enum.unique
-  class Kind(enum.Enum):
-    NOT_ABORTED = 'not aborted'
-    ABORTED_NOTIFY_NEEDED = 'aborted notify needed'
-    ABORTED_NO_NOTIFY = 'aborted no notify'
-
-_NOT_ABORTED = _Abort(_Abort.Kind.NOT_ABORTED, None, None, None)
-_ABORTED_NO_NOTIFY = _Abort(_Abort.Kind.ABORTED_NO_NOTIFY, None, None, None)
-
-
-class TransmissionManager(_interfaces.TransmissionManager):
-  """An _interfaces.TransmissionManager that sends links.Tickets."""
-
-  def __init__(
-      self, operation_id, ticket_sink, lock, pool, termination_manager):
-    """Constructor.
-
-    Args:
-      operation_id: The operation's ID.
-      ticket_sink: A callable that accepts tickets and sends them to the other
-        side of the operation.
-      lock: The operation-servicing-wide lock object.
-      pool: A thread pool in which the work of transmitting tickets will be
-        performed.
-      termination_manager: The _interfaces.TerminationManager associated with
-        this operation.
-    """
-    self._lock = lock
-    self._pool = pool
-    self._ticket_sink = ticket_sink
-    self._operation_id = operation_id
-    self._termination_manager = termination_manager
-    self._expiration_manager = None
-
-    self._lowest_unused_sequence_number = 0
-    self._remote_allowance = 1
-    self._remote_complete = False
-    self._timeout = None
-    self._local_allowance = 0
-    self._initial_metadata = None
-    self._payloads = []
-    self._completion = None
-    self._abort = _NOT_ABORTED
-    self._transmitting = False
-
-  def set_expiration_manager(self, expiration_manager):
-    """Sets the ExpirationManager with which this manager will cooperate."""
-    self._expiration_manager = expiration_manager
-
-  def _next_ticket(self):
-    """Creates the next ticket to be transmitted.
-
-    Returns:
-      A links.Ticket to be sent to the other side of the operation or None if
-        there is nothing to be sent at this time.
-    """
-    if self._abort.kind is _Abort.Kind.ABORTED_NO_NOTIFY:
-      return None
-    elif self._abort.kind is _Abort.Kind.ABORTED_NOTIFY_NEEDED:
-      termination = self._abort.termination
-      code, details = self._abort.code, self._abort.details
-      self._abort = _ABORTED_NO_NOTIFY
-      return links.Ticket(
-          self._operation_id, self._lowest_unused_sequence_number, None, None,
-          None, None, None, None, None, None, code, details, termination, None)
-
-    action = False
-    # TODO(nathaniel): Support other subscriptions.
-    local_subscription = links.Ticket.Subscription.FULL
-    timeout = self._timeout
-    if timeout is not None:
-      self._timeout = None
-      action = True
-    if self._local_allowance <= 0:
-      allowance = None
-    else:
-      allowance = self._local_allowance
-      self._local_allowance = 0
-      action = True
-    initial_metadata = self._initial_metadata
-    if initial_metadata is not None:
-      self._initial_metadata = None
-      action = True
-    if not self._payloads or self._remote_allowance <= 0:
-      payload = None
-    else:
-      payload = self._payloads.pop(0)
-      self._remote_allowance -= 1
-      action = True
-    if self._completion is None or self._payloads:
-      terminal_metadata, code, message, termination = None, None, None, None
-    else:
-      terminal_metadata, code, message, termination = _explode_completion(
-          self._completion)
-      self._completion = None
-      action = True
-
-    if action:
-      ticket = links.Ticket(
-          self._operation_id, self._lowest_unused_sequence_number, None, None,
-          local_subscription, timeout, allowance, initial_metadata, payload,
-          terminal_metadata, code, message, termination, None)
-      self._lowest_unused_sequence_number += 1
-      return ticket
-    else:
-      return None
-
-  def _transmit(self, ticket):
-    """Commences the transmission loop sending tickets.
-
-    Args:
-      ticket: A links.Ticket to be sent to the other side of the operation.
-    """
-    def transmit(ticket):
-      while True:
-        transmission_outcome = callable_util.call_logging_exceptions(
-            self._ticket_sink, _TRANSMISSION_EXCEPTION_LOG_MESSAGE, ticket)
-        if transmission_outcome.exception is None:
-          with self._lock:
-            if ticket.termination is links.Ticket.Termination.COMPLETION:
-              self._termination_manager.transmission_complete()
-            ticket = self._next_ticket()
-            if ticket is None:
-              self._transmitting = False
-              return
-        else:
-          with self._lock:
-            self._abort = _ABORTED_NO_NOTIFY
-            if self._termination_manager.outcome is None:
-              self._termination_manager.abort(_TRANSMISSION_FAILURE_OUTCOME)
-              self._expiration_manager.terminate()
-            return
-
-    self._pool.submit(callable_util.with_exceptions_logged(
-        transmit, _constants.INTERNAL_ERROR_LOG_MESSAGE), ticket)
-    self._transmitting = True
-
-  def kick_off(
-      self, group, method, timeout, protocol_options, initial_metadata,
-      payload, completion, allowance):
-    """See _interfaces.TransmissionManager.kickoff for specification."""
-    # TODO(nathaniel): Support other subscriptions.
-    subscription = links.Ticket.Subscription.FULL
-    terminal_metadata, code, message, termination = _explode_completion(
-        completion)
-    self._remote_allowance = 1 if payload is None else 0
-    protocol = links.Protocol(links.Protocol.Kind.CALL_OPTION, protocol_options)
-    ticket = links.Ticket(
-        self._operation_id, 0, group, method, subscription, timeout, allowance,
-        initial_metadata, payload, terminal_metadata, code, message,
-        termination, protocol)
-    self._lowest_unused_sequence_number = 1
-    self._transmit(ticket)
-
-  def advance(self, initial_metadata, payload, completion, allowance):
-    """See _interfaces.TransmissionManager.advance for specification."""
-    if self._abort.kind is not _Abort.Kind.NOT_ABORTED:
-      return
-
-    effective_initial_metadata = initial_metadata
-    effective_payload = payload
-    effective_completion = completion
-    if allowance is not None and not self._remote_complete:
-      effective_allowance = allowance
-    else:
-      effective_allowance = None
-    if self._transmitting:
-      if effective_initial_metadata is not None:
-        self._initial_metadata = effective_initial_metadata
-      if effective_payload is not None:
-        self._payloads.append(effective_payload)
-      if effective_completion is not None:
-        self._completion = effective_completion
-      if effective_allowance is not None:
-        self._local_allowance += effective_allowance
-    else:
-      if effective_payload is not None:
-        if 0 < self._remote_allowance:
-          ticket_payload = effective_payload
-          self._remote_allowance -= 1
-        else:
-          self._payloads.append(effective_payload)
-          ticket_payload = None
-      else:
-        ticket_payload = None
-      if effective_completion is not None and not self._payloads:
-        ticket_completion = effective_completion
-      else:
-        self._completion = effective_completion
-        ticket_completion = None
-      if any(
-          (effective_initial_metadata, ticket_payload, ticket_completion,
-           effective_allowance)):
-        terminal_metadata, code, message, termination = _explode_completion(
-            completion)
-        ticket = links.Ticket(
-            self._operation_id, self._lowest_unused_sequence_number, None, None,
-            None, None, allowance, effective_initial_metadata, ticket_payload,
-            terminal_metadata, code, message, termination, None)
-        self._lowest_unused_sequence_number += 1
-        self._transmit(ticket)
-
-  def timeout(self, timeout):
-    """See _interfaces.TransmissionManager.timeout for specification."""
-    if self._abort.kind is not _Abort.Kind.NOT_ABORTED:
-      return
-    elif self._transmitting:
-      self._timeout = timeout
-    else:
-      ticket = links.Ticket(
-          self._operation_id, self._lowest_unused_sequence_number, None, None,
-          None, timeout, None, None, None, None, None, None, None, None)
-      self._lowest_unused_sequence_number += 1
-      self._transmit(ticket)
-
-  def allowance(self, allowance):
-    """See _interfaces.TransmissionManager.allowance for specification."""
-    if self._abort.kind is not _Abort.Kind.NOT_ABORTED:
-      return
-    elif self._transmitting or not self._payloads:
-      self._remote_allowance += allowance
-    else:
-      self._remote_allowance += allowance - 1
-      payload = self._payloads.pop(0)
-      if self._payloads:
-        completion = None
-      else:
-        completion = self._completion
-        self._completion = None
-      terminal_metadata, code, message, termination = _explode_completion(
-          completion)
-      ticket = links.Ticket(
-          self._operation_id, self._lowest_unused_sequence_number, None, None,
-          None, None, None, None, payload, terminal_metadata, code, message,
-          termination, None)
-      self._lowest_unused_sequence_number += 1
-      self._transmit(ticket)
-
-  def remote_complete(self):
-    """See _interfaces.TransmissionManager.remote_complete for specification."""
-    self._remote_complete = True
-    self._local_allowance = 0
-
-  def abort(self, outcome):
-    """See _interfaces.TransmissionManager.abort for specification."""
-    if self._abort.kind is _Abort.Kind.NOT_ABORTED:
-      if outcome is None:
-        self._abort = _ABORTED_NO_NOTIFY
-      else:
-        termination = _constants.ABORTION_OUTCOME_TO_TICKET_TERMINATION.get(
-            outcome.kind)
-        if termination is None:
-          self._abort = _ABORTED_NO_NOTIFY
-        elif self._transmitting:
-          self._abort = _Abort(
-              _Abort.Kind.ABORTED_NOTIFY_NEEDED, termination, outcome.code,
-              outcome.details)
-        else:
-          ticket = links.Ticket(
-              self._operation_id, self._lowest_unused_sequence_number, None,
-              None, None, None, None, None, None, None, outcome.code,
-              outcome.details, termination, None)
-          self._transmit(ticket)
-          self._abort = _ABORTED_NO_NOTIFY
diff --git a/src/python/grpcio/grpc/framework/core/_utilities.py b/src/python/grpcio/grpc/framework/core/_utilities.py
deleted file mode 100644
index abedc727e4..0000000000
--- a/src/python/grpcio/grpc/framework/core/_utilities.py
+++ /dev/null
@@ -1,54 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Package-internal utilities."""
-
-import collections
-
-from grpc.framework.interfaces.base import base
-
-
-class ServicerPackage(
-    collections.namedtuple(
-        'ServicerPackage', ('servicer', 'default_timeout', 'maximum_timeout'))):
-  """A trivial bundle class.
-
-  Attributes:
-    servicer: A base.Servicer.
-    default_timeout: A float indicating the length of time in seconds to allow
-      for an operation invoked without a timeout.
-    maximum_timeout: A float indicating the maximum length of time in seconds to
-      allow for an operation.
-  """
-
-
-class Outcome(
-    base.Outcome,
-    collections.namedtuple('Outcome', ('kind', 'code', 'details',))):
-  """A trivial implementation of base.Outcome."""
diff --git a/src/python/grpcio/grpc/framework/core/implementations.py b/src/python/grpcio/grpc/framework/core/implementations.py
deleted file mode 100644
index 364a7faed4..0000000000
--- a/src/python/grpcio/grpc/framework/core/implementations.py
+++ /dev/null
@@ -1,62 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Entry points into the ticket-exchange-based base layer implementation."""
-
-# base and links are referenced from specification in this module.
-from grpc.framework.core import _end
-from grpc.framework.interfaces.base import base  # pylint: disable=unused-import
-from grpc.framework.interfaces.links import links  # pylint: disable=unused-import
-
-
-def invocation_end_link():
-  """Creates a base.End-links.Link suitable for operation invocation.
-
-  Returns:
-    An object that is both a base.End and a links.Link, that supports operation
-      invocation, and that translates operation invocation into ticket exchange.
-  """
-  return _end.serviceless_end_link()
-
-
-def service_end_link(servicer, default_timeout, maximum_timeout):
-  """Creates a base.End-links.Link suitable for operation service.
-
-  Args:
-    servicer: A base.Servicer for servicing operations.
-    default_timeout: A length of time in seconds to be used as the default
-      time alloted for a single operation.
-    maximum_timeout: A length of time in seconds to be used as the maximum
-      time alloted for a single operation.
-
-  Returns:
-    An object that is both a base.End and a links.Link and that services
-      operations that arrive at it through ticket exchange.
-  """
-  return _end.serviceful_end_link(servicer, default_timeout, maximum_timeout)
diff --git a/src/python/grpcio/grpc/framework/crust/__init__.py b/src/python/grpcio/grpc/framework/crust/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio/grpc/framework/crust/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio/grpc/framework/crust/_calls.py b/src/python/grpcio/grpc/framework/crust/_calls.py
deleted file mode 100644
index bff940d747..0000000000
--- a/src/python/grpcio/grpc/framework/crust/_calls.py
+++ /dev/null
@@ -1,223 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Utility functions for invoking RPCs."""
-
-from grpc.framework.crust import _control
-from grpc.framework.interfaces.base import utilities
-from grpc.framework.interfaces.face import face
-
-_ITERATOR_EXCEPTION_LOG_MESSAGE = 'Exception iterating over requests!'
-
-_EMPTY_COMPLETION = utilities.completion(None, None, None)
-
-
-def _invoke(
-    end, group, method, timeout, protocol_options, initial_metadata, payload,
-    complete):
-  rendezvous = _control.Rendezvous(None, None)
-  subscription = utilities.full_subscription(
-      rendezvous, _control.protocol_receiver(rendezvous))
-  operation_context, operator = end.operate(
-      group, method, subscription, timeout, protocol_options=protocol_options,
-      initial_metadata=initial_metadata, payload=payload,
-      completion=_EMPTY_COMPLETION if complete else None)
-  rendezvous.set_operator_and_context(operator, operation_context)
-  outcome = operation_context.add_termination_callback(rendezvous.set_outcome)
-  if outcome is not None:
-    rendezvous.set_outcome(outcome)
-  return rendezvous, operation_context, outcome
-
-
-def _event_return_unary(
-    receiver, abortion_callback, rendezvous, operation_context, outcome, pool):
-  if outcome is None:
-    def in_pool():
-      abortion = rendezvous.add_abortion_callback(abortion_callback)
-      if abortion is None:
-        try:
-          receiver.initial_metadata(rendezvous.initial_metadata())
-          receiver.response(next(rendezvous))
-          receiver.complete(
-              rendezvous.terminal_metadata(), rendezvous.code(),
-              rendezvous.details())
-        except face.AbortionError:
-          pass
-      else:
-        abortion_callback(abortion)
-    pool.submit(_control.pool_wrap(in_pool, operation_context))
-  return rendezvous
-
-
-def _event_return_stream(
-    receiver, abortion_callback, rendezvous, operation_context, outcome, pool):
-  if outcome is None:
-    def in_pool():
-      abortion = rendezvous.add_abortion_callback(abortion_callback)
-      if abortion is None:
-        try:
-          receiver.initial_metadata(rendezvous.initial_metadata())
-          for response in rendezvous:
-            receiver.response(response)
-          receiver.complete(
-              rendezvous.terminal_metadata(), rendezvous.code(),
-              rendezvous.details())
-        except face.AbortionError:
-          pass
-      else:
-        abortion_callback(abortion)
-    pool.submit(_control.pool_wrap(in_pool, operation_context))
-  return rendezvous
-
-
-def blocking_unary_unary(
-    end, group, method, timeout, with_call, protocol_options, initial_metadata,
-    payload):
-  """Services in a blocking fashion a unary-unary servicer method."""
-  rendezvous, unused_operation_context, unused_outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, payload,
-      True)
-  if with_call:
-    return next(rendezvous), rendezvous
-  else:
-    return next(rendezvous)
-
-
-def future_unary_unary(
-    end, group, method, timeout, protocol_options, initial_metadata, payload):
-  """Services a value-in value-out servicer method by returning a Future."""
-  rendezvous, unused_operation_context, unused_outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, payload,
-      True)
-  return rendezvous
-
-
-def inline_unary_stream(
-    end, group, method, timeout, protocol_options, initial_metadata, payload):
-  """Services a value-in stream-out servicer method."""
-  rendezvous, unused_operation_context, unused_outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, payload,
-      True)
-  return rendezvous
-
-
-def blocking_stream_unary(
-    end, group, method, timeout, with_call, protocol_options, initial_metadata,
-    payload_iterator, pool):
-  """Services in a blocking fashion a stream-in value-out servicer method."""
-  rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, None,
-      False)
-  if outcome is None:
-    def in_pool():
-      for payload in payload_iterator:
-        rendezvous.consume(payload)
-      rendezvous.terminate()
-    pool.submit(_control.pool_wrap(in_pool, operation_context))
-    if with_call:
-      return next(rendezvous), rendezvous
-    else:
-      return next(rendezvous)
-  else:
-    if with_call:
-      return next(rendezvous), rendezvous
-    else:
-      return next(rendezvous)
-
-
-def future_stream_unary(
-    end, group, method, timeout, protocol_options, initial_metadata,
-    payload_iterator, pool):
-  """Services a stream-in value-out servicer method by returning a Future."""
-  rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, None,
-      False)
-  if outcome is None:
-    def in_pool():
-      for payload in payload_iterator:
-        rendezvous.consume(payload)
-      rendezvous.terminate()
-    pool.submit(_control.pool_wrap(in_pool, operation_context))
-  return rendezvous
-
-
-def inline_stream_stream(
-    end, group, method, timeout, protocol_options, initial_metadata,
-    payload_iterator, pool):
-  """Services a stream-in stream-out servicer method."""
-  rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, None,
-      False)
-  if outcome is None:
-    def in_pool():
-      for payload in payload_iterator:
-        rendezvous.consume(payload)
-      rendezvous.terminate()
-    pool.submit(_control.pool_wrap(in_pool, operation_context))
-  return rendezvous
-
-
-def event_unary_unary(
-    end, group, method, timeout, protocol_options, initial_metadata, payload,
-    receiver, abortion_callback, pool):
-  rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, payload,
-      True)
-  return _event_return_unary(
-      receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
-
-
-def event_unary_stream(
-    end, group, method, timeout, protocol_options, initial_metadata, payload,
-    receiver, abortion_callback, pool):
-  rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, payload,
-      True)
-  return _event_return_stream(
-      receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
-
-
-def event_stream_unary(
-    end, group, method, timeout, protocol_options, initial_metadata, receiver,
-    abortion_callback, pool):
-  rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, None,
-      False)
-  return _event_return_unary(
-      receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
-
-
-def event_stream_stream(
-    end, group, method, timeout, protocol_options, initial_metadata, receiver,
-    abortion_callback, pool):
-  rendezvous, operation_context, outcome = _invoke(
-      end, group, method, timeout, protocol_options, initial_metadata, None,
-      False)
-  return _event_return_stream(
-      receiver, abortion_callback, rendezvous, operation_context, outcome, pool)
diff --git a/src/python/grpcio/grpc/framework/crust/_control.py b/src/python/grpcio/grpc/framework/crust/_control.py
deleted file mode 100644
index 9b4167bda0..0000000000
--- a/src/python/grpcio/grpc/framework/crust/_control.py
+++ /dev/null
@@ -1,584 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for translating between sync and async control flow."""
-
-import collections
-import enum
-import sys
-import threading
-import time
-
-from grpc.framework.foundation import abandonment
-from grpc.framework.foundation import callable_util
-from grpc.framework.foundation import future
-from grpc.framework.foundation import stream
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.base import utilities
-from grpc.framework.interfaces.face import face
-
-_DONE_CALLBACK_LOG_MESSAGE = 'Exception calling Future "done" callback!'
-_INTERNAL_ERROR_LOG_MESSAGE = ':-( RPC Framework (Crust) Internal Error! )-:'
-
-_CANNOT_SET_INITIAL_METADATA = (
-    'Could not set initial metadata - has it already been set, or has a ' +
-    'payload already been sent?')
-_CANNOT_SET_TERMINAL_METADATA = (
-    'Could not set terminal metadata - has it already been set, or has RPC ' +
-    'completion already been indicated?')
-_CANNOT_SET_CODE = (
-    'Could not set code - has it already been set, or has RPC completion ' +
-    'already been indicated?')
-_CANNOT_SET_DETAILS = (
-    'Could not set details - has it already been set, or has RPC completion ' +
-    'already been indicated?')
-
-
-class _DummyOperator(base.Operator):
-
-  def advance(
-      self, initial_metadata=None, payload=None, completion=None,
-      allowance=None):
-    pass
-
-_DUMMY_OPERATOR = _DummyOperator()
-
-
-class _Awaited(
-    collections.namedtuple('_Awaited', ('kind', 'value',))):
-
-  @enum.unique
-  class Kind(enum.Enum):
-    NOT_YET_ARRIVED = 'not yet arrived'
-    ARRIVED = 'arrived'
-
-_NOT_YET_ARRIVED = _Awaited(_Awaited.Kind.NOT_YET_ARRIVED, None)
-_ARRIVED_AND_NONE = _Awaited(_Awaited.Kind.ARRIVED, None)
-
-
-class _Transitory(
-    collections.namedtuple('_Transitory', ('kind', 'value',))):
-
-  @enum.unique
-  class Kind(enum.Enum):
-    NOT_YET_SEEN = 'not yet seen'
-    PRESENT = 'present'
-    GONE = 'gone'
-
-_NOT_YET_SEEN = _Transitory(_Transitory.Kind.NOT_YET_SEEN, None)
-_GONE = _Transitory(_Transitory.Kind.GONE, None)
-
-
-class _Termination(
-    collections.namedtuple(
-        '_Termination', ('terminated', 'abortion', 'abortion_error',))):
-  """Values indicating whether and how an RPC has terminated.
-
-  Attributes:
-    terminated: A boolean indicating whether or not the RPC has terminated.
-    abortion: A face.Abortion value describing the RPC's abortion or None if the
-      RPC did not abort.
-    abortion_error: A face.AbortionError describing the RPC's abortion or None
-      if the RPC did not abort.
-  """
-
-_NOT_TERMINATED = _Termination(False, None, None)
-
-_OPERATION_OUTCOME_KIND_TO_TERMINATION_CONSTRUCTOR = {
-    base.Outcome.Kind.COMPLETED: lambda *unused_args: _Termination(
-        True, None, None),
-    base.Outcome.Kind.CANCELLED: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.CANCELLED, *args),
-        face.CancellationError(*args)),
-    base.Outcome.Kind.EXPIRED: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.EXPIRED, *args),
-        face.ExpirationError(*args)),
-    base.Outcome.Kind.LOCAL_SHUTDOWN: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.LOCAL_SHUTDOWN, *args),
-        face.LocalShutdownError(*args)),
-    base.Outcome.Kind.REMOTE_SHUTDOWN: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.REMOTE_SHUTDOWN, *args),
-        face.RemoteShutdownError(*args)),
-    base.Outcome.Kind.RECEPTION_FAILURE: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.NETWORK_FAILURE, *args),
-        face.NetworkError(*args)),
-    base.Outcome.Kind.TRANSMISSION_FAILURE: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.NETWORK_FAILURE, *args),
-        face.NetworkError(*args)),
-    base.Outcome.Kind.LOCAL_FAILURE: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.LOCAL_FAILURE, *args),
-        face.LocalError(*args)),
-    base.Outcome.Kind.REMOTE_FAILURE: lambda *args: _Termination(
-        True, face.Abortion(face.Abortion.Kind.REMOTE_FAILURE, *args),
-        face.RemoteError(*args)),
-}
-
-
-def _wait_once_until(condition, until):
-  if until is None:
-    condition.wait()
-  else:
-    remaining = until - time.time()
-    if remaining < 0:
-      raise future.TimeoutError()
-    else:
-      condition.wait(timeout=remaining)
-
-
-def _done_callback_as_operation_termination_callback(
-    done_callback, rendezvous):
-  def operation_termination_callback(operation_outcome):
-    rendezvous.set_outcome(operation_outcome)
-    done_callback(rendezvous)
-  return operation_termination_callback
-
-
-def _abortion_callback_as_operation_termination_callback(
-    rpc_abortion_callback, rendezvous_set_outcome):
-  def operation_termination_callback(operation_outcome):
-    termination = rendezvous_set_outcome(operation_outcome)
-    if termination.abortion is not None:
-      rpc_abortion_callback(termination.abortion)
-  return operation_termination_callback
-
-
-class Rendezvous(base.Operator, future.Future, stream.Consumer, face.Call):
-  """A rendez-vous for the threads of an operation.
-
-  Instances of this object present iterator and stream.Consumer interfaces for
-  interacting with application code and present a base.Operator interface and
-  maintain a base.Operator internally for interacting with base interface code.
-  """
-
-  def __init__(self, operator, operation_context):
-    self._condition = threading.Condition()
-
-    self._operator = operator
-    self._operation_context = operation_context
-
-    self._protocol_context = _NOT_YET_ARRIVED
-
-    self._up_initial_metadata = _NOT_YET_ARRIVED
-    self._up_payload = None
-    self._up_allowance = 1
-    self._up_completion = _NOT_YET_ARRIVED
-    self._down_initial_metadata = _NOT_YET_SEEN
-    self._down_payload = None
-    self._down_allowance = 1
-    self._down_terminal_metadata = _NOT_YET_SEEN
-    self._down_code = _NOT_YET_SEEN
-    self._down_details = _NOT_YET_SEEN
-
-    self._termination = _NOT_TERMINATED
-
-    # The semantics of future.Future.cancel and future.Future.cancelled are
-    # slightly wonky, so they have to be tracked separately from the rest of the
-    # result of the RPC. This field tracks whether cancellation was requested
-    # prior to termination of the RPC
-    self._cancelled = False
-
-  def set_operator_and_context(self, operator, operation_context):
-    with self._condition:
-      self._operator = operator
-      self._operation_context = operation_context
-
-  def _down_completion(self):
-    if self._down_terminal_metadata.kind is _Transitory.Kind.NOT_YET_SEEN:
-      terminal_metadata = None
-      self._down_terminal_metadata = _GONE
-    elif self._down_terminal_metadata.kind is _Transitory.Kind.PRESENT:
-      terminal_metadata = self._down_terminal_metadata.value
-      self._down_terminal_metadata = _GONE
-    else:
-      terminal_metadata = None
-    if self._down_code.kind is _Transitory.Kind.NOT_YET_SEEN:
-      code = None
-      self._down_code = _GONE
-    elif self._down_code.kind is _Transitory.Kind.PRESENT:
-      code = self._down_code.value
-      self._down_code = _GONE
-    else:
-      code = None
-    if self._down_details.kind is _Transitory.Kind.NOT_YET_SEEN:
-      details = None
-      self._down_details = _GONE
-    elif self._down_details.kind is _Transitory.Kind.PRESENT:
-      details = self._down_details.value
-      self._down_details = _GONE
-    else:
-      details = None
-    return utilities.completion(terminal_metadata, code, details)
-
-  def _set_outcome(self, outcome):
-    if not self._termination.terminated:
-      self._operator = _DUMMY_OPERATOR
-      self._operation_context = None
-      self._down_initial_metadata = _GONE
-      self._down_payload = None
-      self._down_terminal_metadata = _GONE
-      self._down_code = _GONE
-      self._down_details = _GONE
-
-      if self._up_initial_metadata.kind is _Awaited.Kind.NOT_YET_ARRIVED:
-        initial_metadata = None
-      else:
-        initial_metadata = self._up_initial_metadata.value
-      if self._up_completion.kind is _Awaited.Kind.NOT_YET_ARRIVED:
-        terminal_metadata = None
-      else:
-        terminal_metadata = self._up_completion.value.terminal_metadata
-      if outcome.kind is base.Outcome.Kind.COMPLETED:
-        code = self._up_completion.value.code
-        details = self._up_completion.value.message
-      else:
-        code = outcome.code
-        details = outcome.details
-      self._termination = _OPERATION_OUTCOME_KIND_TO_TERMINATION_CONSTRUCTOR[
-          outcome.kind](initial_metadata, terminal_metadata, code, details)
-
-      self._condition.notify_all()
-
-    return self._termination
-
-  def advance(
-      self, initial_metadata=None, payload=None, completion=None,
-      allowance=None):
-    with self._condition:
-      if initial_metadata is not None:
-        self._up_initial_metadata = _Awaited(
-            _Awaited.Kind.ARRIVED, initial_metadata)
-      if payload is not None:
-        if self._up_initial_metadata.kind is _Awaited.Kind.NOT_YET_ARRIVED:
-          self._up_initial_metadata = _ARRIVED_AND_NONE
-        self._up_payload = payload
-        self._up_allowance -= 1
-      if completion is not None:
-        if self._up_initial_metadata.kind is _Awaited.Kind.NOT_YET_ARRIVED:
-          self._up_initial_metadata = _ARRIVED_AND_NONE
-        self._up_completion = _Awaited(
-            _Awaited.Kind.ARRIVED, completion)
-      if allowance is not None:
-        if self._down_payload is not None:
-          self._operator.advance(payload=self._down_payload)
-          self._down_payload = None
-          self._down_allowance += allowance - 1
-        else:
-          self._down_allowance += allowance
-      self._condition.notify_all()
-
-  def cancel(self):
-    with self._condition:
-      if self._operation_context is not None:
-        self._operation_context.cancel()
-        self._cancelled = True
-      return False
-
-  def cancelled(self):
-    with self._condition:
-      return self._cancelled
-
-  def running(self):
-    with self._condition:
-      return not self._termination.terminated
-
-  def done(self):
-    with self._condition:
-      return self._termination.terminated
-
-  def result(self, timeout=None):
-    until = None if timeout is None else time.time() + timeout
-    with self._condition:
-      while True:
-        if self._termination.terminated:
-          if self._termination.abortion is None:
-            return self._up_payload
-          elif self._termination.abortion.kind is face.Abortion.Kind.CANCELLED:
-            raise future.CancelledError()
-          else:
-            raise self._termination.abortion_error  # pylint: disable=raising-bad-type
-        else:
-          _wait_once_until(self._condition, until)
-
-  def exception(self, timeout=None):
-    until = None if timeout is None else time.time() + timeout
-    with self._condition:
-      while True:
-        if self._termination.terminated:
-          if self._termination.abortion is None:
-            return None
-          else:
-            return self._termination.abortion_error
-        else:
-          _wait_once_until(self._condition, until)
-
-  def traceback(self, timeout=None):
-    until = None if timeout is None else time.time() + timeout
-    with self._condition:
-      while True:
-        if self._termination.terminated:
-          if self._termination.abortion_error is None:
-            return None
-          else:
-            abortion_error = self._termination.abortion_error
-            break
-        else:
-          _wait_once_until(self._condition, until)
-
-    try:
-      raise abortion_error
-    except face.AbortionError:
-      return sys.exc_info()[2]
-
-  def add_done_callback(self, fn):
-    with self._condition:
-      if self._operation_context is not None:
-        outcome = self._operation_context.add_termination_callback(
-            _done_callback_as_operation_termination_callback(fn, self))
-        if outcome is None:
-          return
-        else:
-          self._set_outcome(outcome)
-
-    fn(self)
-
-  def consume(self, value):
-    with self._condition:
-      while True:
-        if self._termination.terminated:
-          return
-        elif 0 < self._down_allowance:
-          self._operator.advance(payload=value)
-          self._down_allowance -= 1
-          return
-        else:
-          self._condition.wait()
-
-  def terminate(self):
-    with self._condition:
-      if self._termination.terminated:
-        return
-      elif self._down_code.kind is _Transitory.Kind.GONE:
-        # Conform to specified idempotence of terminate by ignoring extra calls.
-        return
-      else:
-        completion = self._down_completion()
-        self._operator.advance(completion=completion)
-
-  def consume_and_terminate(self, value):
-    with self._condition:
-      while True:
-        if self._termination.terminated:
-          return
-        elif 0 < self._down_allowance:
-          completion = self._down_completion()
-          self._operator.advance(payload=value, completion=completion)
-          return
-        else:
-          self._condition.wait()
-
-  def __iter__(self):
-    return self
-
-  def __next__(self):
-    return self.next()
-
-  def next(self):
-    with self._condition:
-      while True:
-        if self._termination.abortion_error is not None:
-          raise self._termination.abortion_error
-        elif self._up_payload is not None:
-          payload = self._up_payload
-          self._up_payload = None
-          if self._up_completion.kind is _Awaited.Kind.NOT_YET_ARRIVED:
-            self._operator.advance(allowance=1)
-          return payload
-        elif self._up_completion.kind is _Awaited.Kind.ARRIVED:
-          raise StopIteration()
-        else:
-          self._condition.wait()
-
-  def is_active(self):
-    with self._condition:
-      return not self._termination.terminated
-
-  def time_remaining(self):
-    if self._operation_context is None:
-      return 0
-    else:
-      return self._operation_context.time_remaining()
-
-  def add_abortion_callback(self, abortion_callback):
-    with self._condition:
-      if self._operation_context is None:
-        return self._termination.abortion
-      else:
-        outcome = self._operation_context.add_termination_callback(
-            _abortion_callback_as_operation_termination_callback(
-                abortion_callback, self.set_outcome))
-        if outcome is not None:
-          return self._set_outcome(outcome).abortion
-        else:
-          return self._termination.abortion
-
-  def protocol_context(self):
-    with self._condition:
-      while True:
-        if self._protocol_context.kind is _Awaited.Kind.ARRIVED:
-          return self._protocol_context.value
-        elif self._termination.abortion_error is not None:
-          raise self._termination.abortion_error
-        else:
-          self._condition.wait()
-
-  def initial_metadata(self):
-    with self._condition:
-      while True:
-        if self._up_initial_metadata.kind is _Awaited.Kind.ARRIVED:
-          return self._up_initial_metadata.value
-        elif self._termination.terminated:
-          return None
-        else:
-          self._condition.wait()
-
-  def terminal_metadata(self):
-    with self._condition:
-      while True:
-        if self._up_completion.kind is _Awaited.Kind.ARRIVED:
-          return self._up_completion.value.terminal_metadata
-        elif self._termination.terminated:
-          return None
-        else:
-          self._condition.wait()
-
-  def code(self):
-    with self._condition:
-      while True:
-        if self._up_completion.kind is _Awaited.Kind.ARRIVED:
-          return self._up_completion.value.code
-        elif self._termination.terminated:
-          return None
-        else:
-          self._condition.wait()
-
-  def details(self):
-    with self._condition:
-      while True:
-        if self._up_completion.kind is _Awaited.Kind.ARRIVED:
-          return self._up_completion.value.message
-        elif self._termination.terminated:
-          return None
-        else:
-          self._condition.wait()
-
-  def set_initial_metadata(self, initial_metadata):
-    with self._condition:
-      if (self._down_initial_metadata.kind is not
-          _Transitory.Kind.NOT_YET_SEEN):
-        raise ValueError(_CANNOT_SET_INITIAL_METADATA)
-      else:
-        self._down_initial_metadata = _GONE
-        self._operator.advance(initial_metadata=initial_metadata)
-
-  def set_terminal_metadata(self, terminal_metadata):
-    with self._condition:
-      if (self._down_terminal_metadata.kind is not
-          _Transitory.Kind.NOT_YET_SEEN):
-        raise ValueError(_CANNOT_SET_TERMINAL_METADATA)
-      else:
-        self._down_terminal_metadata = _Transitory(
-            _Transitory.Kind.PRESENT, terminal_metadata)
-
-  def set_code(self, code):
-    with self._condition:
-      if self._down_code.kind is not _Transitory.Kind.NOT_YET_SEEN:
-        raise ValueError(_CANNOT_SET_CODE)
-      else:
-        self._down_code = _Transitory(_Transitory.Kind.PRESENT, code)
-
-  def set_details(self, details):
-    with self._condition:
-      if self._down_details.kind is not _Transitory.Kind.NOT_YET_SEEN:
-        raise ValueError(_CANNOT_SET_DETAILS)
-      else:
-        self._down_details = _Transitory(_Transitory.Kind.PRESENT, details)
-
-  def set_protocol_context(self, protocol_context):
-    with self._condition:
-      self._protocol_context = _Awaited(
-          _Awaited.Kind.ARRIVED, protocol_context)
-      self._condition.notify_all()
-
-  def set_outcome(self, outcome):
-    with self._condition:
-      return self._set_outcome(outcome)
-
-
-class _ProtocolReceiver(base.ProtocolReceiver):
-
-  def __init__(self, rendezvous):
-    self._rendezvous = rendezvous
-
-  def context(self, protocol_context):
-    self._rendezvous.set_protocol_context(protocol_context)
-
-
-def protocol_receiver(rendezvous):
-  return _ProtocolReceiver(rendezvous)
-
-
-def pool_wrap(behavior, operation_context):
-  """Wraps an operation-related behavior so that it may be called in a pool.
-
-  Args:
-    behavior: A callable related to carrying out an operation.
-    operation_context: A base_interfaces.OperationContext for the operation.
-
-  Returns:
-    A callable that when called carries out the behavior of the given callable
-      and handles whatever exceptions it raises appropriately.
-  """
-  def translation(*args):
-    try:
-      behavior(*args)
-    except (
-        abandonment.Abandoned,
-        face.CancellationError,
-        face.ExpirationError,
-        face.LocalShutdownError,
-        face.RemoteShutdownError,
-        face.NetworkError,
-        face.RemoteError,
-    ) as e:
-      if operation_context.outcome() is None:
-        operation_context.fail(e)
-    except Exception as e:
-      operation_context.fail(e)
-  return callable_util.with_exceptions_logged(
-      translation, _INTERNAL_ERROR_LOG_MESSAGE)
diff --git a/src/python/grpcio/grpc/framework/crust/_service.py b/src/python/grpcio/grpc/framework/crust/_service.py
deleted file mode 100644
index 9903415c09..0000000000
--- a/src/python/grpcio/grpc/framework/crust/_service.py
+++ /dev/null
@@ -1,173 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Behaviors for servicing RPCs."""
-
-from grpc.framework.crust import _control
-from grpc.framework.foundation import abandonment
-from grpc.framework.interfaces.base import utilities
-from grpc.framework.interfaces.face import face
-
-
-class _ServicerContext(face.ServicerContext):
-
-  def __init__(self, rendezvous):
-    self._rendezvous = rendezvous
-
-  def is_active(self):
-    return self._rendezvous.is_active()
-
-  def time_remaining(self):
-    return self._rendezvous.time_remaining()
-
-  def add_abortion_callback(self, abortion_callback):
-    return self._rendezvous.add_abortion_callback(abortion_callback)
-
-  def cancel(self):
-    self._rendezvous.cancel()
-
-  def protocol_context(self):
-    return self._rendezvous.protocol_context()
-
-  def invocation_metadata(self):
-    return self._rendezvous.initial_metadata()
-
-  def initial_metadata(self, initial_metadata):
-    self._rendezvous.set_initial_metadata(initial_metadata)
-
-  def terminal_metadata(self, terminal_metadata):
-    self._rendezvous.set_terminal_metadata(terminal_metadata)
-
-  def code(self, code):
-    self._rendezvous.set_code(code)
-
-  def details(self, details):
-    self._rendezvous.set_details(details)
-
-
-def _adaptation(pool, in_pool):
-  def adaptation(operator, operation_context):
-    rendezvous = _control.Rendezvous(operator, operation_context)
-    subscription = utilities.full_subscription(
-        rendezvous, _control.protocol_receiver(rendezvous))
-    outcome = operation_context.add_termination_callback(rendezvous.set_outcome)
-    if outcome is None:
-      pool.submit(_control.pool_wrap(in_pool, operation_context), rendezvous)
-      return subscription
-    else:
-      raise abandonment.Abandoned()
-  return adaptation
-
-
-def adapt_inline_unary_unary(method, pool):
-  def in_pool(rendezvous):
-    request = next(rendezvous)
-    response = method(request, _ServicerContext(rendezvous))
-    rendezvous.consume_and_terminate(response)
-  return _adaptation(pool, in_pool)
-
-
-def adapt_inline_unary_stream(method, pool):
-  def in_pool(rendezvous):
-    request = next(rendezvous)
-    response_iterator = method(request, _ServicerContext(rendezvous))
-    for response in response_iterator:
-      rendezvous.consume(response)
-    rendezvous.terminate()
-  return _adaptation(pool, in_pool)
-
-
-def adapt_inline_stream_unary(method, pool):
-  def in_pool(rendezvous):
-    response = method(rendezvous, _ServicerContext(rendezvous))
-    rendezvous.consume_and_terminate(response)
-  return _adaptation(pool, in_pool)
-
-
-def adapt_inline_stream_stream(method, pool):
-  def in_pool(rendezvous):
-    response_iterator = method(rendezvous, _ServicerContext(rendezvous))
-    for response in response_iterator:
-      rendezvous.consume(response)
-    rendezvous.terminate()
-  return _adaptation(pool, in_pool)
-
-
-def adapt_event_unary_unary(method, pool):
-  def in_pool(rendezvous):
-    request = next(rendezvous)
-    method(
-        request, rendezvous.consume_and_terminate, _ServicerContext(rendezvous))
-  return _adaptation(pool, in_pool)
-
-
-def adapt_event_unary_stream(method, pool):
-  def in_pool(rendezvous):
-    request = next(rendezvous)
-    method(request, rendezvous, _ServicerContext(rendezvous))
-  return _adaptation(pool, in_pool)
-
-
-def adapt_event_stream_unary(method, pool):
-  def in_pool(rendezvous):
-    request_consumer = method(
-        rendezvous.consume_and_terminate, _ServicerContext(rendezvous))
-    for request in rendezvous:
-      request_consumer.consume(request)
-    request_consumer.terminate()
-  return _adaptation(pool, in_pool)
-
-
-def adapt_event_stream_stream(method, pool):
-  def in_pool(rendezvous):
-    request_consumer = method(rendezvous, _ServicerContext(rendezvous))
-    for request in rendezvous:
-      request_consumer.consume(request)
-    request_consumer.terminate()
-  return _adaptation(pool, in_pool)
-
-
-def adapt_multi_method(multi_method, pool):
-  def adaptation(group, method, operator, operation_context):
-    rendezvous = _control.Rendezvous(operator, operation_context)
-    subscription = utilities.full_subscription(
-        rendezvous, _control.protocol_receiver(rendezvous))
-    outcome = operation_context.add_termination_callback(rendezvous.set_outcome)
-    if outcome is None:
-      def in_pool():
-        request_consumer = multi_method.service(
-            group, method, rendezvous, _ServicerContext(rendezvous))
-        for request in rendezvous:
-          request_consumer.consume(request)
-        request_consumer.terminate()
-      pool.submit(_control.pool_wrap(in_pool, operation_context), rendezvous)
-      return subscription
-    else:
-      raise abandonment.Abandoned()
-  return adaptation
diff --git a/src/python/grpcio/grpc/framework/crust/implementations.py b/src/python/grpcio/grpc/framework/crust/implementations.py
deleted file mode 100644
index 2d3ab733b6..0000000000
--- a/src/python/grpcio/grpc/framework/crust/implementations.py
+++ /dev/null
@@ -1,366 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Entry points into the Crust layer of RPC Framework."""
-
-import six
-
-from grpc.framework.common import cardinality
-from grpc.framework.common import style
-from grpc.framework.crust import _calls
-from grpc.framework.crust import _service
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.face import face
-
-
-class _BaseServicer(base.Servicer):
-
-  def __init__(self, adapted_methods, adapted_multi_method):
-    self._adapted_methods = adapted_methods
-    self._adapted_multi_method = adapted_multi_method
-
-  def service(self, group, method, context, output_operator):
-    adapted_method = self._adapted_methods.get((group, method), None)
-    if adapted_method is not None:
-      return adapted_method(output_operator, context)
-    elif self._adapted_multi_method is not None:
-      try:
-        return self._adapted_multi_method(
-            group, method, output_operator, context)
-      except face.NoSuchMethodError:
-        raise base.NoSuchMethodError(None, None)
-    else:
-      raise base.NoSuchMethodError(None, None)
-
-
-class _UnaryUnaryMultiCallable(face.UnaryUnaryMultiCallable):
-
-  def __init__(self, end, group, method, pool):
-    self._end = end
-    self._group = group
-    self._method = method
-    self._pool = pool
-
-  def __call__(
-      self, request, timeout, metadata=None, with_call=False,
-      protocol_options=None):
-    return _calls.blocking_unary_unary(
-        self._end, self._group, self._method, timeout, with_call,
-        protocol_options, metadata, request)
-
-  def future(self, request, timeout, metadata=None, protocol_options=None):
-    return _calls.future_unary_unary(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, request)
-
-  def event(
-      self, request, receiver, abortion_callback, timeout,
-      metadata=None, protocol_options=None):
-    return _calls.event_unary_unary(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, request, receiver, abortion_callback, self._pool)
-
-
-class _UnaryStreamMultiCallable(face.UnaryStreamMultiCallable):
-
-  def __init__(self, end, group, method, pool):
-    self._end = end
-    self._group = group
-    self._method = method
-    self._pool = pool
-
-  def __call__(self, request, timeout, metadata=None, protocol_options=None):
-    return _calls.inline_unary_stream(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, request)
-
-  def event(
-      self, request, receiver, abortion_callback, timeout,
-      metadata=None, protocol_options=None):
-    return _calls.event_unary_stream(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, request, receiver, abortion_callback, self._pool)
-
-
-class _StreamUnaryMultiCallable(face.StreamUnaryMultiCallable):
-
-  def __init__(self, end, group, method, pool):
-    self._end = end
-    self._group = group
-    self._method = method
-    self._pool = pool
-
-  def __call__(
-      self, request_iterator, timeout, metadata=None,
-      with_call=False, protocol_options=None):
-    return _calls.blocking_stream_unary(
-        self._end, self._group, self._method, timeout, with_call,
-        protocol_options, metadata, request_iterator, self._pool)
-
-  def future(
-      self, request_iterator, timeout, metadata=None, protocol_options=None):
-    return _calls.future_stream_unary(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, request_iterator, self._pool)
-
-  def event(
-      self, receiver, abortion_callback, timeout, metadata=None,
-      protocol_options=None):
-    return _calls.event_stream_unary(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, receiver, abortion_callback, self._pool)
-
-
-class _StreamStreamMultiCallable(face.StreamStreamMultiCallable):
-
-  def __init__(self, end, group, method, pool):
-    self._end = end
-    self._group = group
-    self._method = method
-    self._pool = pool
-
-  def __call__(
-      self, request_iterator, timeout, metadata=None, protocol_options=None):
-    return _calls.inline_stream_stream(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, request_iterator, self._pool)
-
-  def event(
-      self, receiver, abortion_callback, timeout, metadata=None,
-      protocol_options=None):
-    return _calls.event_stream_stream(
-        self._end, self._group, self._method, timeout, protocol_options,
-        metadata, receiver, abortion_callback, self._pool)
-
-
-class _GenericStub(face.GenericStub):
-  """An face.GenericStub implementation."""
-
-  def __init__(self, end, pool):
-    self._end = end
-    self._pool = pool
-
-  def blocking_unary_unary(
-      self, group, method, request, timeout, metadata=None,
-      with_call=None, protocol_options=None):
-    return _calls.blocking_unary_unary(
-        self._end, group, method, timeout, with_call, protocol_options,
-        metadata, request)
-
-  def future_unary_unary(
-      self, group, method, request, timeout, metadata=None,
-      protocol_options=None):
-    return _calls.future_unary_unary(
-        self._end, group, method, timeout, protocol_options, metadata, request)
-
-  def inline_unary_stream(
-      self, group, method, request, timeout, metadata=None,
-      protocol_options=None):
-    return _calls.inline_unary_stream(
-        self._end, group, method, timeout, protocol_options, metadata, request)
-
-  def blocking_stream_unary(
-      self, group, method, request_iterator, timeout, metadata=None,
-      with_call=None, protocol_options=None):
-    return _calls.blocking_stream_unary(
-        self._end, group, method, timeout, with_call, protocol_options,
-        metadata, request_iterator, self._pool)
-
-  def future_stream_unary(
-      self, group, method, request_iterator, timeout, metadata=None,
-      protocol_options=None):
-    return _calls.future_stream_unary(
-        self._end, group, method, timeout, protocol_options, metadata,
-        request_iterator, self._pool)
-
-  def inline_stream_stream(
-      self, group, method, request_iterator, timeout, metadata=None,
-      protocol_options=None):
-    return _calls.inline_stream_stream(
-        self._end, group, method, timeout, protocol_options, metadata,
-        request_iterator, self._pool)
-
-  def event_unary_unary(
-      self, group, method, request, receiver, abortion_callback, timeout,
-      metadata=None, protocol_options=None):
-    return _calls.event_unary_unary(
-        self._end, group, method, timeout, protocol_options, metadata, request,
-        receiver, abortion_callback, self._pool)
-
-  def event_unary_stream(
-      self, group, method, request, receiver, abortion_callback, timeout,
-      metadata=None, protocol_options=None):
-    return _calls.event_unary_stream(
-        self._end, group, method, timeout, protocol_options, metadata, request,
-        receiver, abortion_callback, self._pool)
-
-  def event_stream_unary(
-      self, group, method, receiver, abortion_callback, timeout,
-      metadata=None, protocol_options=None):
-    return _calls.event_stream_unary(
-        self._end, group, method, timeout, protocol_options, metadata, receiver,
-        abortion_callback, self._pool)
-
-  def event_stream_stream(
-      self, group, method, receiver, abortion_callback, timeout,
-      metadata=None, protocol_options=None):
-    return _calls.event_stream_stream(
-        self._end, group, method, timeout, protocol_options, metadata, receiver,
-        abortion_callback, self._pool)
-
-  def unary_unary(self, group, method):
-    return _UnaryUnaryMultiCallable(self._end, group, method, self._pool)
-
-  def unary_stream(self, group, method):
-    return _UnaryStreamMultiCallable(self._end, group, method, self._pool)
-
-  def stream_unary(self, group, method):
-    return _StreamUnaryMultiCallable(self._end, group, method, self._pool)
-
-  def stream_stream(self, group, method):
-    return _StreamStreamMultiCallable(self._end, group, method, self._pool)
-
-
-class _DynamicStub(face.DynamicStub):
-  """An face.DynamicStub implementation."""
-
-  def __init__(self, end, group, cardinalities, pool):
-    self._end = end
-    self._group = group
-    self._cardinalities = cardinalities
-    self._pool = pool
-
-  def __getattr__(self, attr):
-    method_cardinality = self._cardinalities.get(attr)
-    if method_cardinality is cardinality.Cardinality.UNARY_UNARY:
-      return _UnaryUnaryMultiCallable(self._end, self._group, attr, self._pool)
-    elif method_cardinality is cardinality.Cardinality.UNARY_STREAM:
-      return _UnaryStreamMultiCallable(self._end, self._group, attr, self._pool)
-    elif method_cardinality is cardinality.Cardinality.STREAM_UNARY:
-      return _StreamUnaryMultiCallable(self._end, self._group, attr, self._pool)
-    elif method_cardinality is cardinality.Cardinality.STREAM_STREAM:
-      return _StreamStreamMultiCallable(
-          self._end, self._group, attr, self._pool)
-    else:
-      raise AttributeError('_DynamicStub object has no attribute "%s"!' % attr)
-
-
-def _adapt_method_implementations(method_implementations, pool):
-  adapted_implementations = {}
-  for name, method_implementation in six.iteritems(method_implementations):
-    if method_implementation.style is style.Service.INLINE:
-      if method_implementation.cardinality is cardinality.Cardinality.UNARY_UNARY:
-        adapted_implementations[name] = _service.adapt_inline_unary_unary(
-            method_implementation.unary_unary_inline, pool)
-      elif method_implementation.cardinality is cardinality.Cardinality.UNARY_STREAM:
-        adapted_implementations[name] = _service.adapt_inline_unary_stream(
-            method_implementation.unary_stream_inline, pool)
-      elif method_implementation.cardinality is cardinality.Cardinality.STREAM_UNARY:
-        adapted_implementations[name] = _service.adapt_inline_stream_unary(
-            method_implementation.stream_unary_inline, pool)
-      elif method_implementation.cardinality is cardinality.Cardinality.STREAM_STREAM:
-        adapted_implementations[name] = _service.adapt_inline_stream_stream(
-            method_implementation.stream_stream_inline, pool)
-    elif method_implementation.style is style.Service.EVENT:
-      if method_implementation.cardinality is cardinality.Cardinality.UNARY_UNARY:
-        adapted_implementations[name] = _service.adapt_event_unary_unary(
-            method_implementation.unary_unary_event, pool)
-      elif method_implementation.cardinality is cardinality.Cardinality.UNARY_STREAM:
-        adapted_implementations[name] = _service.adapt_event_unary_stream(
-            method_implementation.unary_stream_event, pool)
-      elif method_implementation.cardinality is cardinality.Cardinality.STREAM_UNARY:
-        adapted_implementations[name] = _service.adapt_event_stream_unary(
-            method_implementation.stream_unary_event, pool)
-      elif method_implementation.cardinality is cardinality.Cardinality.STREAM_STREAM:
-        adapted_implementations[name] = _service.adapt_event_stream_stream(
-            method_implementation.stream_stream_event, pool)
-  return adapted_implementations
-
-
-def servicer(method_implementations, multi_method_implementation, pool):
-  """Creates a base.Servicer.
-
-  It is guaranteed that any passed face.MultiMethodImplementation will
-  only be called to service an RPC if there is no
-  face.MethodImplementation for the RPC method in the passed
-  method_implementations dictionary.
-
-  Args:
-    method_implementations: A dictionary from RPC method name to
-      face.MethodImplementation object to be used to service the named
-      RPC method.
-    multi_method_implementation: An face.MultiMethodImplementation to be
-      used to service any RPCs not serviced by the
-      face.MethodImplementations given in the method_implementations
-      dictionary, or None.
-    pool: A thread pool.
-
-  Returns:
-    A base.Servicer that services RPCs via the given implementations.
-  """
-  adapted_implementations = _adapt_method_implementations(
-      method_implementations, pool)
-  if multi_method_implementation is None:
-    adapted_multi_method_implementation = None
-  else:
-    adapted_multi_method_implementation = _service.adapt_multi_method(
-        multi_method_implementation, pool)
-  return _BaseServicer(
-      adapted_implementations, adapted_multi_method_implementation)
-
-
-def generic_stub(end, pool):
-  """Creates an face.GenericStub.
-
-  Args:
-    end: A base.End.
-    pool: A futures.ThreadPoolExecutor.
-
-  Returns:
-    A face.GenericStub that performs RPCs via the given base.End.
-  """
-  return _GenericStub(end, pool)
-
-
-def dynamic_stub(end, group, cardinalities, pool):
-  """Creates an face.DynamicStub.
-
-  Args:
-    end: A base.End.
-    group: The group identifier for all RPCs to be made with the created
-      face.DynamicStub.
-    cardinalities: A dict from method identifier to cardinality.Cardinality
-      value identifying the cardinality of every RPC method to be supported by
-      the created face.DynamicStub.
-    pool: A futures.ThreadPoolExecutor.
-
-  Returns:
-    A face.DynamicStub that performs RPCs via the given base.End.
-  """
-  return _DynamicStub(end, group, cardinalities, pool)
diff --git a/src/python/grpcio/grpc/framework/foundation/_timer_future.py b/src/python/grpcio/grpc/framework/foundation/_timer_future.py
deleted file mode 100644
index 2c9996aa9d..0000000000
--- a/src/python/grpcio/grpc/framework/foundation/_timer_future.py
+++ /dev/null
@@ -1,228 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Affords a Future implementation based on Python's threading.Timer."""
-
-import sys
-import threading
-import time
-
-from grpc.framework.foundation import future
-
-
-class TimerFuture(future.Future):
-  """A Future implementation based around Timer objects."""
-
-  def __init__(self, compute_time, computation):
-    """Constructor.
-
-    Args:
-      compute_time: The time after which to begin this future's computation.
-      computation: The computation to be performed within this Future.
-    """
-    self._lock = threading.Lock()
-    self._compute_time = compute_time
-    self._computation = computation
-    self._timer = None
-    self._computing = False
-    self._computed = False
-    self._cancelled = False
-    self._result = None
-    self._exception = None
-    self._traceback = None
-    self._waiting = []
-
-  def _compute(self):
-    """Performs the computation embedded in this Future.
-
-    Or doesn't, if the time to perform it has not yet arrived.
-    """
-    with self._lock:
-      time_remaining = self._compute_time - time.time()
-      if 0 < time_remaining:
-        self._timer = threading.Timer(time_remaining, self._compute)
-        self._timer.start()
-        return
-      else:
-        self._computing = True
-
-    try:
-      return_value = self._computation()
-      exception = None
-      traceback = None
-    except Exception as e:  # pylint: disable=broad-except
-      return_value = None
-      exception = e
-      traceback = sys.exc_info()[2]
-
-    with self._lock:
-      self._computing = False
-      self._computed = True
-      self._return_value = return_value
-      self._exception = exception
-      self._traceback = traceback
-      waiting = self._waiting
-
-    for callback in waiting:
-      callback(self)
-
-  def start(self):
-    """Starts this Future.
-
-    This must be called exactly once, immediately after construction.
-    """
-    with self._lock:
-      self._timer = threading.Timer(
-          self._compute_time - time.time(), self._compute)
-      self._timer.start()
-
-  def cancel(self):
-    """See future.Future.cancel for specification."""
-    with self._lock:
-      if self._computing or self._computed:
-        return False
-      elif self._cancelled:
-        return True
-      else:
-        self._timer.cancel()
-        self._cancelled = True
-        waiting = self._waiting
-
-    for callback in waiting:
-      try:
-        callback(self)
-      except Exception:  # pylint: disable=broad-except
-        pass
-
-    return True
-
-  def cancelled(self):
-    """See future.Future.cancelled for specification."""
-    with self._lock:
-      return self._cancelled
-
-  def running(self):
-    """See future.Future.running for specification."""
-    with self._lock:
-      return not self._computed and not self._cancelled
-
-  def done(self):
-    """See future.Future.done for specification."""
-    with self._lock:
-      return self._computed or self._cancelled
-
-  def result(self, timeout=None):
-    """See future.Future.result for specification."""
-    with self._lock:
-      if self._cancelled:
-        raise future.CancelledError()
-      elif self._computed:
-        if self._exception is None:
-          return self._return_value
-        else:
-          raise self._exception  # pylint: disable=raising-bad-type
-
-      condition = threading.Condition()
-      def notify_condition(unused_future):
-        with condition:
-          condition.notify()
-      self._waiting.append(notify_condition)
-
-    with condition:
-      condition.wait(timeout=timeout)
-
-    with self._lock:
-      if self._cancelled:
-        raise future.CancelledError()
-      elif self._computed:
-        if self._exception is None:
-          return self._return_value
-        else:
-          raise self._exception  # pylint: disable=raising-bad-type
-      else:
-        raise future.TimeoutError()
-
-  def exception(self, timeout=None):
-    """See future.Future.exception for specification."""
-    with self._lock:
-      if self._cancelled:
-        raise future.CancelledError()
-      elif self._computed:
-        return self._exception
-
-      condition = threading.Condition()
-      def notify_condition(unused_future):
-        with condition:
-          condition.notify()
-      self._waiting.append(notify_condition)
-
-    with condition:
-      condition.wait(timeout=timeout)
-
-    with self._lock:
-      if self._cancelled:
-        raise future.CancelledError()
-      elif self._computed:
-        return self._exception
-      else:
-        raise future.TimeoutError()
-
-  def traceback(self, timeout=None):
-    """See future.Future.traceback for specification."""
-    with self._lock:
-      if self._cancelled:
-        raise future.CancelledError()
-      elif self._computed:
-        return self._traceback
-
-      condition = threading.Condition()
-      def notify_condition(unused_future):
-        with condition:
-          condition.notify()
-      self._waiting.append(notify_condition)
-
-    with condition:
-      condition.wait(timeout=timeout)
-
-    with self._lock:
-      if self._cancelled:
-        raise future.CancelledError()
-      elif self._computed:
-        return self._traceback
-      else:
-        raise future.TimeoutError()
-
-  def add_done_callback(self, fn):
-    """See future.Future.add_done_callback for specification."""
-    with self._lock:
-      if not self._computed and not self._cancelled:
-        self._waiting.append(fn)
-        return
-
-    fn(self)
diff --git a/src/python/grpcio/grpc/framework/foundation/activated.py b/src/python/grpcio/grpc/framework/foundation/activated.py
deleted file mode 100644
index 8b8e4f45b5..0000000000
--- a/src/python/grpcio/grpc/framework/foundation/activated.py
+++ /dev/null
@@ -1,65 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Interfaces related to streams of values or objects."""
-
-import abc
-
-import six
-
-class Activated(six.with_metaclass(abc.ABCMeta)):
-  """Interface for objects that may be started and stopped.
-
-  Values implementing this type must also implement the context manager
-  protocol.
-  """
-
-  @abc.abstractmethod
-  def __enter__(self):
-    """See the context manager protocol for specification."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    """See the context manager protocol for specification."""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def start(self):
-    """Activates this object.
-
-    Returns:
-      A value equal to the value returned by this object's __enter__ method.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def stop(self):
-    """Deactivates this object."""
-    raise NotImplementedError()
diff --git a/src/python/grpcio/grpc/framework/foundation/later.py b/src/python/grpcio/grpc/framework/foundation/later.py
deleted file mode 100644
index 1d1e065041..0000000000
--- a/src/python/grpcio/grpc/framework/foundation/later.py
+++ /dev/null
@@ -1,51 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Enables scheduling execution at a later time."""
-
-import time
-
-from grpc.framework.foundation import _timer_future
-
-
-def later(delay, computation):
-  """Schedules later execution of a callable.
-
-  Args:
-    delay: Any numeric value. Represents the minimum length of time in seconds
-      to allow to pass before beginning the computation. No guarantees are made
-      about the maximum length of time that will pass.
-    computation: A callable that accepts no arguments.
-
-  Returns:
-    A Future representing the scheduled computation.
-  """
-  timer_future = _timer_future.TimerFuture(time.time() + delay, computation)
-  timer_future.start()
-  return timer_future
diff --git a/src/python/grpcio/grpc/framework/foundation/relay.py b/src/python/grpcio/grpc/framework/foundation/relay.py
deleted file mode 100644
index 20f41b2738..0000000000
--- a/src/python/grpcio/grpc/framework/foundation/relay.py
+++ /dev/null
@@ -1,174 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Implementations of in-order work deference."""
-
-import abc
-import enum
-import threading
-
-from grpc.framework.foundation import activated
-from grpc.framework.foundation import logging_pool
-
-_NULL_BEHAVIOR = lambda unused_value: None
-
-
-class Relay(object):
-  """Performs work submitted to it in another thread.
-
-  Performs work in the order in which work was submitted to it; otherwise there
-  would be no reason to use an implementation of this interface instead of a
-  thread pool.
-  """
-
-  @abc.abstractmethod
-  def add_value(self, value):
-    """Adds a value to be passed to the behavior registered with this Relay.
-
-    Args:
-      value: A value that will be passed to a call made in another thread to the
-        behavior registered with this Relay.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def set_behavior(self, behavior):
-    """Sets the behavior that this Relay should call when passed values.
-
-    Args:
-      behavior: The behavior that this Relay should call in another thread when
-        passed a value, or None to have passed values ignored.
-    """
-    raise NotImplementedError()
-
-
-class _PoolRelay(activated.Activated, Relay):
-
-  @enum.unique
-  class _State(enum.Enum):
-    INACTIVE = 'inactive'
-    IDLE = 'idle'
-    SPINNING = 'spinning'
-
-  def __init__(self, pool, behavior):
-    self._condition = threading.Condition()
-    self._pool = pool
-    self._own_pool = pool is None
-    self._state = _PoolRelay._State.INACTIVE
-    self._activated = False
-    self._spinning = False
-    self._values = []
-    self._behavior = _NULL_BEHAVIOR if behavior is None else behavior
-
-  def _spin(self, behavior, value):
-    while True:
-      behavior(value)
-      with self._condition:
-        if self._values:
-          value = self._values.pop(0)
-          behavior = self._behavior
-        else:
-          self._state = _PoolRelay._State.IDLE
-          self._condition.notify_all()
-          break
-
-  def add_value(self, value):
-    with self._condition:
-      if self._state is _PoolRelay._State.INACTIVE:
-        raise ValueError('add_value not valid on inactive Relay!')
-      elif self._state is _PoolRelay._State.IDLE:
-        self._pool.submit(self._spin, self._behavior, value)
-        self._state = _PoolRelay._State.SPINNING
-      else:
-        self._values.append(value)
-
-  def set_behavior(self, behavior):
-    with self._condition:
-      self._behavior = _NULL_BEHAVIOR if behavior is None else behavior
-
-  def _start(self):
-    with self._condition:
-      self._state = _PoolRelay._State.IDLE
-      if self._own_pool:
-        self._pool = logging_pool.pool(1)
-      return self
-
-  def _stop(self):
-    with self._condition:
-      while self._state is _PoolRelay._State.SPINNING:
-        self._condition.wait()
-      if self._own_pool:
-        self._pool.shutdown(wait=True)
-      self._state = _PoolRelay._State.INACTIVE
-
-  def __enter__(self):
-    return self._start()
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    self._stop()
-    return False
-
-  def start(self):
-    return self._start()
-
-  def stop(self):
-    self._stop()
-
-
-def relay(behavior):
-  """Creates a Relay.
-
-  Args:
-    behavior: The behavior to be called by the created Relay, or None to have
-      passed values dropped until a different behavior is given to the returned
-      Relay later.
-
-  Returns:
-    An object that is both an activated.Activated and a Relay. The object is
-      only valid for use as a Relay when activated.
-  """
-  return _PoolRelay(None, behavior)
-
-
-def pool_relay(pool, behavior):
-  """Creates a Relay that uses a given thread pool.
-
-  This object will make use of at most one thread in the given pool.
-
-  Args:
-    pool: A futures.ThreadPoolExecutor for use by the created Relay.
-    behavior: The behavior to be called by the created Relay, or None to have
-      passed values dropped until a different behavior is given to the returned
-      Relay later.
-
-  Returns:
-    An object that is both an activated.Activated and a Relay. The object is
-      only valid for use as a Relay when activated.
-  """
-  return _PoolRelay(pool, behavior)
diff --git a/src/python/grpcio/grpc/framework/interfaces/links/__init__.py b/src/python/grpcio/grpc/framework/interfaces/links/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio/grpc/framework/interfaces/links/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio/grpc/framework/interfaces/links/links.py b/src/python/grpcio/grpc/framework/interfaces/links/links.py
deleted file mode 100644
index 9631b19078..0000000000
--- a/src/python/grpcio/grpc/framework/interfaces/links/links.py
+++ /dev/null
@@ -1,143 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""The low-level ticket-exchanging-links interface of RPC Framework."""
-
-import abc
-import collections
-import enum
-
-import six
-
-
-class Protocol(collections.namedtuple('Protocol', ('kind', 'value',))):
-  """A sum type for handles to a system that transmits tickets.
-
-  Attributes:
-    kind: A Kind value identifying the kind of value being passed.
-    value: The value being passed between the high-level application and the
-      system affording ticket transport.
-  """
-
-  @enum.unique
-  class Kind(enum.Enum):
-    CALL_OPTION = 'call option'
-    SERVICER_CONTEXT = 'servicer context'
-    INVOCATION_CONTEXT = 'invocation context'
-
-
-class Ticket(
-    collections.namedtuple(
-        'Ticket',
-        ('operation_id', 'sequence_number', 'group', 'method', 'subscription',
-         'timeout', 'allowance', 'initial_metadata', 'payload',
-         'terminal_metadata', 'code', 'message', 'termination', 'protocol',))):
-  """A sum type for all values sent from a front to a back.
-
-  Attributes:
-    operation_id: A unique-with-respect-to-equality hashable object identifying
-      a particular operation.
-    sequence_number: A zero-indexed integer sequence number identifying the
-      ticket's place in the stream of tickets sent in one direction for the
-      particular operation.
-    group: The group to which the method of the operation belongs. Must be
-      present in the first ticket from invocation side to service side. Ignored
-      for all other tickets exchanged during the operation.
-    method: The name of an operation. Must be present in the first ticket from
-      invocation side to service side. Ignored for all other tickets exchanged
-      during the operation.
-    subscription: A Subscription value describing the interest one side has in
-      receiving information from the other side. Must be present in the first
-      ticket from either side. Ignored for all other tickets exchanged during
-      the operation.
-    timeout: A nonzero length of time (measured from the beginning of the
-      operation) to allow for the entire operation. Must be present in the first
-      ticket from invocation side to service side. Optional for all other
-      tickets exchanged during the operation. Receipt of a value from the other
-      side of the operation indicates the value in use by that side. Setting a
-      value on a later ticket allows either side to request time extensions (or
-      even time reductions!) on in-progress operations.
-    allowance: A positive integer granting permission for a number of payloads
-      to be transmitted to the communicating side of the operation, or None if
-      no additional allowance is being granted with this ticket.
-    initial_metadata: An optional metadata value communicated from one side to
-      the other at the beginning of the operation. May be non-None in at most
-      one ticket from each side. Any non-None value must appear no later than
-      the first payload value.
-    payload: A customer payload object. May be None.
-    terminal_metadata: A metadata value comminicated from one side to the other
-      at the end of the operation. May be non-None in the same ticket as
-      the code and message, but must be None for all earlier tickets.
-    code: A value communicated at operation completion. May be None.
-    message: A value communicated at operation completion. May be None.
-    termination: A Termination value describing the end of the operation, or
-      None if the operation has not yet terminated. If set, no further tickets
-      may be sent in the same direction.
-    protocol: A Protocol value or None, with further semantics being a matter
-      between high-level application and underlying ticket transport.
-  """
-
-  @enum.unique
-  class Subscription(enum.Enum):
-    """Identifies the level of subscription of a side of an operation."""
-
-    NONE = 'none'
-    TERMINATION = 'termination'
-    FULL = 'full'
-
-  @enum.unique
-  class Termination(enum.Enum):
-    """Identifies the termination of an operation."""
-
-    COMPLETION = 'completion'
-    CANCELLATION = 'cancellation'
-    EXPIRATION = 'expiration'
-    SHUTDOWN = 'shutdown'
-    RECEPTION_FAILURE = 'reception failure'
-    TRANSMISSION_FAILURE = 'transmission failure'
-    LOCAL_FAILURE = 'local failure'
-    REMOTE_FAILURE = 'remote failure'
-
-
-class Link(six.with_metaclass(abc.ABCMeta)):
-  """Accepts and emits tickets."""
-
-  @abc.abstractmethod
-  def accept_ticket(self, ticket):
-    """Accept a Ticket.
-
-    Args:
-      ticket: Any Ticket.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def join_link(self, link):
-    """Mates this object with a peer with which it will exchange tickets."""
-    raise NotImplementedError()
diff --git a/src/python/grpcio/grpc/framework/interfaces/links/utilities.py b/src/python/grpcio/grpc/framework/interfaces/links/utilities.py
deleted file mode 100644
index 6e4fd76d93..0000000000
--- a/src/python/grpcio/grpc/framework/interfaces/links/utilities.py
+++ /dev/null
@@ -1,44 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Utilities provided as part of the links interface."""
-
-from grpc.framework.interfaces.links import links
-
-
-class _NullLink(links.Link):
-  """A do-nothing links.Link."""
-
-  def accept_ticket(self, ticket):
-    pass
-
-  def join_link(self, link):
-    pass
-
-NULL_LINK = _NullLink()
diff --git a/src/python/grpcio_tests/tests/unit/_adapter/.gitignore b/src/python/grpcio_tests/tests/unit/_adapter/.gitignore
deleted file mode 100644
index a6f96cd6db..0000000000
--- a/src/python/grpcio_tests/tests/unit/_adapter/.gitignore
+++ /dev/null
@@ -1,5 +0,0 @@
-*.a
-*.so
-*.dll
-*.pyc
-*.pyd
diff --git a/src/python/grpcio_tests/tests/unit/_adapter/__init__.py b/src/python/grpcio_tests/tests/unit/_adapter/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio_tests/tests/unit/_adapter/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio_tests/tests/unit/_adapter/_proto_scenarios.py b/src/python/grpcio_tests/tests/unit/_adapter/_proto_scenarios.py
deleted file mode 100644
index 7a90eacf77..0000000000
--- a/src/python/grpcio_tests/tests/unit/_adapter/_proto_scenarios.py
+++ /dev/null
@@ -1,262 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Test scenarios using protocol buffers."""
-
-import abc
-import threading
-
-import six
-
-from tests.unit._junkdrawer import math_pb2
-
-
-class ProtoScenario(six.with_metaclass(abc.ABCMeta)):
-  """An RPC test scenario using protocol buffers."""
-
-  @abc.abstractmethod
-  def method(self):
-    """Access the test method name.
-
-    Returns:
-      The test method name.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def serialize_request(self, request):
-    """Serialize a request protocol buffer.
-
-    Args:
-      request: A request protocol buffer.
-
-    Returns:
-      The bytestring serialization of the given request protocol buffer.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def deserialize_request(self, request_bytestring):
-    """Deserialize a request protocol buffer.
-
-    Args:
-      request_bytestring: The bytestring serialization of a request protocol
-        buffer.
-
-    Returns:
-      The request protocol buffer deserialized from the given byte string.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def serialize_response(self, response):
-    """Serialize a response protocol buffer.
-
-    Args:
-      response: A response protocol buffer.
-
-    Returns:
-      The bytestring serialization of the given response protocol buffer.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def deserialize_response(self, response_bytestring):
-    """Deserialize a response protocol buffer.
-
-    Args:
-      response_bytestring: The bytestring serialization of a response protocol
-        buffer.
-
-    Returns:
-      The response protocol buffer deserialized from the given byte string.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def requests(self):
-    """Access the sequence of requests for this scenario.
-
-    Returns:
-      A sequence of request protocol buffers.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def response_for_request(self, request):
-    """Access the response for a particular request.
-
-    Args:
-      request: A request protocol buffer.
-
-    Returns:
-      The response protocol buffer appropriate for the given request.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def verify_requests(self, experimental_requests):
-    """Verify the requests transmitted through the system under test.
-
-    Args:
-      experimental_requests: The request protocol buffers transmitted through
-        the system under test.
-
-    Returns:
-      True if the requests satisfy this test scenario; False otherwise.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def verify_responses(self, experimental_responses):
-    """Verify the responses transmitted through the system under test.
-
-    Args:
-      experimental_responses: The response protocol buffers transmitted through
-        the system under test.
-
-    Returns:
-      True if the responses satisfy this test scenario; False otherwise.
-    """
-    raise NotImplementedError()
-
-
-class EmptyScenario(ProtoScenario):
-  """A scenario that transmits no protocol buffers in either direction."""
-
-  def method(self):
-    return 'DivMany'
-
-  def serialize_request(self, request):
-    raise ValueError('This should not be necessary to call!')
-
-  def deserialize_request(self, request_bytestring):
-    raise ValueError('This should not be necessary to call!')
-
-  def serialize_response(self, response):
-    raise ValueError('This should not be necessary to call!')
-
-  def deserialize_response(self, response_bytestring):
-    raise ValueError('This should not be necessary to call!')
-
-  def requests(self):
-    return ()
-
-  def response_for_request(self, request):
-    raise ValueError('This should not be necessary to call!')
-
-  def verify_requests(self, experimental_requests):
-    return not experimental_requests
-
-  def verify_responses(self, experimental_responses):
-    return not experimental_responses
-
-
-class BidirectionallyUnaryScenario(ProtoScenario):
-  """A scenario that transmits no protocol buffers in either direction."""
-
-  _DIVIDEND = 59
-  _DIVISOR = 7
-  _QUOTIENT = 8
-  _REMAINDER = 3
-
-  _REQUEST = math_pb2.DivArgs(dividend=_DIVIDEND, divisor=_DIVISOR)
-  _RESPONSE = math_pb2.DivReply(quotient=_QUOTIENT, remainder=_REMAINDER)
-
-  def method(self):
-    return 'Div'
-
-  def serialize_request(self, request):
-    return request.SerializeToString()
-
-  def deserialize_request(self, request_bytestring):
-    return math_pb2.DivArgs.FromString(request_bytestring)
-
-  def serialize_response(self, response):
-    return response.SerializeToString()
-
-  def deserialize_response(self, response_bytestring):
-    return math_pb2.DivReply.FromString(response_bytestring)
-
-  def requests(self):
-    return [self._REQUEST]
-
-  def response_for_request(self, request):
-    return self._RESPONSE
-
-  def verify_requests(self, experimental_requests):
-    return tuple(experimental_requests) == (self._REQUEST,)
-
-  def verify_responses(self, experimental_responses):
-    return tuple(experimental_responses) == (self._RESPONSE,)
-
-
-class BidirectionallyStreamingScenario(ProtoScenario):
-  """A scenario that transmits no protocol buffers in either direction."""
-
-  _STREAM_LENGTH = 200
-  _REQUESTS = tuple(
-      math_pb2.DivArgs(dividend=59 + index, divisor=7 + index)
-      for index in range(_STREAM_LENGTH))
-
-  def __init__(self):
-    self._lock = threading.Lock()
-    self._responses = []
-
-  def method(self):
-    return 'DivMany'
-
-  def serialize_request(self, request):
-    return request.SerializeToString()
-
-  def deserialize_request(self, request_bytestring):
-    return math_pb2.DivArgs.FromString(request_bytestring)
-
-  def serialize_response(self, response):
-    return response.SerializeToString()
-
-  def deserialize_response(self, response_bytestring):
-    return math_pb2.DivReply.FromString(response_bytestring)
-
-  def requests(self):
-    return self._REQUESTS
-
-  def response_for_request(self, request):
-    quotient, remainder = divmod(request.dividend, request.divisor)
-    response = math_pb2.DivReply(quotient=quotient, remainder=remainder)
-    with self._lock:
-      self._responses.append(response)
-    return response
-
-  def verify_requests(self, experimental_requests):
-    return tuple(experimental_requests) == self._REQUESTS
-
-  def verify_responses(self, experimental_responses):
-    with self._lock:
-      return tuple(experimental_responses) == tuple(self._responses)
diff --git a/src/python/grpcio_tests/tests/unit/_junkdrawer/math_pb2.py b/src/python/grpcio_tests/tests/unit/_junkdrawer/math_pb2.py
deleted file mode 100644
index 20165955b4..0000000000
--- a/src/python/grpcio_tests/tests/unit/_junkdrawer/math_pb2.py
+++ /dev/null
@@ -1,266 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-# TODO(nathaniel): Remove this from source control after having made
-# generation from the math.proto source part of GRPC's build-and-test
-# process.
-
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: math.proto
-
-import sys
-_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
-from google.protobuf import descriptor as _descriptor
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
-from google.protobuf import symbol_database as _symbol_database
-from google.protobuf import descriptor_pb2
-# @@protoc_insertion_point(imports)
-
-_sym_db = _symbol_database.Default()
-
-
-
-
-DESCRIPTOR = _descriptor.FileDescriptor(
-  name='math.proto',
-  package='math',
-  serialized_pb=_b('\n\nmath.proto\x12\x04math\",\n\x07\x44ivArgs\x12\x10\n\x08\x64ividend\x18\x01 \x02(\x03\x12\x0f\n\x07\x64ivisor\x18\x02 \x02(\x03\"/\n\x08\x44ivReply\x12\x10\n\x08quotient\x18\x01 \x02(\x03\x12\x11\n\tremainder\x18\x02 \x02(\x03\"\x18\n\x07\x46ibArgs\x12\r\n\x05limit\x18\x01 \x01(\x03\"\x12\n\x03Num\x12\x0b\n\x03num\x18\x01 \x02(\x03\"\x19\n\x08\x46ibReply\x12\r\n\x05\x63ount\x18\x01 \x02(\x03\x32\xa4\x01\n\x04Math\x12&\n\x03\x44iv\x12\r.math.DivArgs\x1a\x0e.math.DivReply\"\x00\x12.\n\x07\x44ivMany\x12\r.math.DivArgs\x1a\x0e.math.DivReply\"\x00(\x01\x30\x01\x12#\n\x03\x46ib\x12\r.math.FibArgs\x1a\t.math.Num\"\x00\x30\x01\x12\x1f\n\x03Sum\x12\t.math.Num\x1a\t.math.Num\"\x00(\x01')
-)
-_sym_db.RegisterFileDescriptor(DESCRIPTOR)
-
-
-
-
-_DIVARGS = _descriptor.Descriptor(
-  name='DivArgs',
-  full_name='math.DivArgs',
-  filename=None,
-  file=DESCRIPTOR,
-  containing_type=None,
-  fields=[
-    _descriptor.FieldDescriptor(
-      name='dividend', full_name='math.DivArgs.dividend', index=0,
-      number=1, type=3, cpp_type=2, label=2,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    _descriptor.FieldDescriptor(
-      name='divisor', full_name='math.DivArgs.divisor', index=1,
-      number=2, type=3, cpp_type=2, label=2,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  oneofs=[
-  ],
-  serialized_start=20,
-  serialized_end=64,
-)
-
-
-_DIVREPLY = _descriptor.Descriptor(
-  name='DivReply',
-  full_name='math.DivReply',
-  filename=None,
-  file=DESCRIPTOR,
-  containing_type=None,
-  fields=[
-    _descriptor.FieldDescriptor(
-      name='quotient', full_name='math.DivReply.quotient', index=0,
-      number=1, type=3, cpp_type=2, label=2,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-    _descriptor.FieldDescriptor(
-      name='remainder', full_name='math.DivReply.remainder', index=1,
-      number=2, type=3, cpp_type=2, label=2,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  oneofs=[
-  ],
-  serialized_start=66,
-  serialized_end=113,
-)
-
-
-_FIBARGS = _descriptor.Descriptor(
-  name='FibArgs',
-  full_name='math.FibArgs',
-  filename=None,
-  file=DESCRIPTOR,
-  containing_type=None,
-  fields=[
-    _descriptor.FieldDescriptor(
-      name='limit', full_name='math.FibArgs.limit', index=0,
-      number=1, type=3, cpp_type=2, label=1,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  oneofs=[
-  ],
-  serialized_start=115,
-  serialized_end=139,
-)
-
-
-_NUM = _descriptor.Descriptor(
-  name='Num',
-  full_name='math.Num',
-  filename=None,
-  file=DESCRIPTOR,
-  containing_type=None,
-  fields=[
-    _descriptor.FieldDescriptor(
-      name='num', full_name='math.Num.num', index=0,
-      number=1, type=3, cpp_type=2, label=2,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  oneofs=[
-  ],
-  serialized_start=141,
-  serialized_end=159,
-)
-
-
-_FIBREPLY = _descriptor.Descriptor(
-  name='FibReply',
-  full_name='math.FibReply',
-  filename=None,
-  file=DESCRIPTOR,
-  containing_type=None,
-  fields=[
-    _descriptor.FieldDescriptor(
-      name='count', full_name='math.FibReply.count', index=0,
-      number=1, type=3, cpp_type=2, label=2,
-      has_default_value=False, default_value=0,
-      message_type=None, enum_type=None, containing_type=None,
-      is_extension=False, extension_scope=None,
-      options=None),
-  ],
-  extensions=[
-  ],
-  nested_types=[],
-  enum_types=[
-  ],
-  options=None,
-  is_extendable=False,
-  extension_ranges=[],
-  oneofs=[
-  ],
-  serialized_start=161,
-  serialized_end=186,
-)
-
-DESCRIPTOR.message_types_by_name['DivArgs'] = _DIVARGS
-DESCRIPTOR.message_types_by_name['DivReply'] = _DIVREPLY
-DESCRIPTOR.message_types_by_name['FibArgs'] = _FIBARGS
-DESCRIPTOR.message_types_by_name['Num'] = _NUM
-DESCRIPTOR.message_types_by_name['FibReply'] = _FIBREPLY
-
-DivArgs = _reflection.GeneratedProtocolMessageType('DivArgs', (_message.Message,), dict(
-  DESCRIPTOR = _DIVARGS,
-  __module__ = 'math_pb2'
-  # @@protoc_insertion_point(class_scope:math.DivArgs)
-  ))
-_sym_db.RegisterMessage(DivArgs)
-
-DivReply = _reflection.GeneratedProtocolMessageType('DivReply', (_message.Message,), dict(
-  DESCRIPTOR = _DIVREPLY,
-  __module__ = 'math_pb2'
-  # @@protoc_insertion_point(class_scope:math.DivReply)
-  ))
-_sym_db.RegisterMessage(DivReply)
-
-FibArgs = _reflection.GeneratedProtocolMessageType('FibArgs', (_message.Message,), dict(
-  DESCRIPTOR = _FIBARGS,
-  __module__ = 'math_pb2'
-  # @@protoc_insertion_point(class_scope:math.FibArgs)
-  ))
-_sym_db.RegisterMessage(FibArgs)
-
-Num = _reflection.GeneratedProtocolMessageType('Num', (_message.Message,), dict(
-  DESCRIPTOR = _NUM,
-  __module__ = 'math_pb2'
-  # @@protoc_insertion_point(class_scope:math.Num)
-  ))
-_sym_db.RegisterMessage(Num)
-
-FibReply = _reflection.GeneratedProtocolMessageType('FibReply', (_message.Message,), dict(
-  DESCRIPTOR = _FIBREPLY,
-  __module__ = 'math_pb2'
-  # @@protoc_insertion_point(class_scope:math.FibReply)
-  ))
-_sym_db.RegisterMessage(FibReply)
-
-
-# @@protoc_insertion_point(module_scope)
diff --git a/src/python/grpcio_tests/tests/unit/_links/__init__.py b/src/python/grpcio_tests/tests/unit/_links/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio_tests/tests/unit/_links/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio_tests/tests/unit/_links/_proto_scenarios.py b/src/python/grpcio_tests/tests/unit/_links/_proto_scenarios.py
deleted file mode 100644
index 50661085f9..0000000000
--- a/src/python/grpcio_tests/tests/unit/_links/_proto_scenarios.py
+++ /dev/null
@@ -1,262 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Test scenarios using protocol buffers."""
-
-import abc
-import threading
-
-import six
-
-from tests.unit._junkdrawer import math_pb2
-from tests.unit.framework.common import test_constants
-
-
-class ProtoScenario(six.with_metaclass(abc.ABCMeta)):
-  """An RPC test scenario using protocol buffers."""
-
-  @abc.abstractmethod
-  def group_and_method(self):
-    """Access the test group and method.
-
-    Returns:
-      The test group and method as a pair.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def serialize_request(self, request):
-    """Serialize a request protocol buffer.
-
-    Args:
-      request: A request protocol buffer.
-
-    Returns:
-      The bytestring serialization of the given request protocol buffer.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def deserialize_request(self, request_bytestring):
-    """Deserialize a request protocol buffer.
-
-    Args:
-      request_bytestring: The bytestring serialization of a request protocol
-        buffer.
-
-    Returns:
-      The request protocol buffer deserialized from the given byte string.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def serialize_response(self, response):
-    """Serialize a response protocol buffer.
-
-    Args:
-      response: A response protocol buffer.
-
-    Returns:
-      The bytestring serialization of the given response protocol buffer.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def deserialize_response(self, response_bytestring):
-    """Deserialize a response protocol buffer.
-
-    Args:
-      response_bytestring: The bytestring serialization of a response protocol
-        buffer.
-
-    Returns:
-      The response protocol buffer deserialized from the given byte string.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def requests(self):
-    """Access the sequence of requests for this scenario.
-
-    Returns:
-      A sequence of request protocol buffers.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def response_for_request(self, request):
-    """Access the response for a particular request.
-
-    Args:
-      request: A request protocol buffer.
-
-    Returns:
-      The response protocol buffer appropriate for the given request.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def verify_requests(self, experimental_requests):
-    """Verify the requests transmitted through the system under test.
-
-    Args:
-      experimental_requests: The request protocol buffers transmitted through
-        the system under test.
-
-    Returns:
-      True if the requests satisfy this test scenario; False otherwise.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def verify_responses(self, experimental_responses):
-    """Verify the responses transmitted through the system under test.
-
-    Args:
-      experimental_responses: The response protocol buffers transmitted through
-        the system under test.
-
-    Returns:
-      True if the responses satisfy this test scenario; False otherwise.
-    """
-    raise NotImplementedError()
-
-
-class EmptyScenario(ProtoScenario):
-  """A scenario that transmits no protocol buffers in either direction."""
-
-  def group_and_method(self):
-    return 'math.Math', 'DivMany'
-
-  def serialize_request(self, request):
-    raise ValueError('This should not be necessary to call!')
-
-  def deserialize_request(self, request_bytestring):
-    raise ValueError('This should not be necessary to call!')
-
-  def serialize_response(self, response):
-    raise ValueError('This should not be necessary to call!')
-
-  def deserialize_response(self, response_bytestring):
-    raise ValueError('This should not be necessary to call!')
-
-  def requests(self):
-    return ()
-
-  def response_for_request(self, request):
-    raise ValueError('This should not be necessary to call!')
-
-  def verify_requests(self, experimental_requests):
-    return not experimental_requests
-
-  def verify_responses(self, experimental_responses):
-    return not experimental_responses
-
-
-class BidirectionallyUnaryScenario(ProtoScenario):
-  """A scenario that transmits no protocol buffers in either direction."""
-
-  _DIVIDEND = 59
-  _DIVISOR = 7
-  _QUOTIENT = 8
-  _REMAINDER = 3
-
-  _REQUEST = math_pb2.DivArgs(dividend=_DIVIDEND, divisor=_DIVISOR)
-  _RESPONSE = math_pb2.DivReply(quotient=_QUOTIENT, remainder=_REMAINDER)
-
-  def group_and_method(self):
-    return 'math.Math', 'Div'
-
-  def serialize_request(self, request):
-    return request.SerializeToString()
-
-  def deserialize_request(self, request_bytestring):
-    return math_pb2.DivArgs.FromString(request_bytestring)
-
-  def serialize_response(self, response):
-    return response.SerializeToString()
-
-  def deserialize_response(self, response_bytestring):
-    return math_pb2.DivReply.FromString(response_bytestring)
-
-  def requests(self):
-    return [self._REQUEST]
-
-  def response_for_request(self, request):
-    return self._RESPONSE
-
-  def verify_requests(self, experimental_requests):
-    return tuple(experimental_requests) == (self._REQUEST,)
-
-  def verify_responses(self, experimental_responses):
-    return tuple(experimental_responses) == (self._RESPONSE,)
-
-
-class BidirectionallyStreamingScenario(ProtoScenario):
-  """A scenario that transmits no protocol buffers in either direction."""
-
-  _REQUESTS = tuple(
-      math_pb2.DivArgs(dividend=59 + index, divisor=7 + index)
-      for index in range(test_constants.STREAM_LENGTH))
-
-  def __init__(self):
-    self._lock = threading.Lock()
-    self._responses = []
-
-  def group_and_method(self):
-    return 'math.Math', 'DivMany'
-
-  def serialize_request(self, request):
-    return request.SerializeToString()
-
-  def deserialize_request(self, request_bytestring):
-    return math_pb2.DivArgs.FromString(request_bytestring)
-
-  def serialize_response(self, response):
-    return response.SerializeToString()
-
-  def deserialize_response(self, response_bytestring):
-    return math_pb2.DivReply.FromString(response_bytestring)
-
-  def requests(self):
-    return self._REQUESTS
-
-  def response_for_request(self, request):
-    quotient, remainder = divmod(request.dividend, request.divisor)
-    response = math_pb2.DivReply(quotient=quotient, remainder=remainder)
-    with self._lock:
-      self._responses.append(response)
-    return response
-
-  def verify_requests(self, experimental_requests):
-    return tuple(experimental_requests) == self._REQUESTS
-
-  def verify_responses(self, experimental_responses):
-    with self._lock:
-      return tuple(experimental_responses) == tuple(self._responses)
diff --git a/src/python/grpcio_tests/tests/unit/framework/core/__init__.py b/src/python/grpcio_tests/tests/unit/framework/core/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/core/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/__init__.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/base/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_control.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_control.py
deleted file mode 100644
index 0eb38abf22..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_control.py
+++ /dev/null
@@ -1,570 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Part of the tests of the base interface of RPC Framework."""
-
-from __future__ import division
-
-import abc
-import collections
-import enum
-import random  # pylint: disable=unused-import
-import threading
-import time
-
-import six
-
-from grpc.framework.interfaces.base import base
-from tests.unit.framework.common import test_constants
-from tests.unit.framework.interfaces.base import _sequence
-from tests.unit.framework.interfaces.base import _state
-from tests.unit.framework.interfaces.base import test_interfaces  # pylint: disable=unused-import
-
-_GROUP = 'base test cases test group'
-_METHOD = 'base test cases test method'
-
-_PAYLOAD_RANDOM_SECTION_MAXIMUM_SIZE = test_constants.PAYLOAD_SIZE // 20
-_MINIMUM_PAYLOAD_SIZE = test_constants.PAYLOAD_SIZE // 600
-
-
-def _create_payload(randomness):
-  length = randomness.randint(
-      _MINIMUM_PAYLOAD_SIZE, test_constants.PAYLOAD_SIZE)
-  random_section_length = randomness.randint(
-      0, min(_PAYLOAD_RANDOM_SECTION_MAXIMUM_SIZE, length))
-  random_section = bytes(
-      bytearray(
-          randomness.getrandbits(8) for _ in range(random_section_length)))
-  sevens_section = b'\x07' * (length - random_section_length)
-  return b''.join(randomness.sample((random_section, sevens_section), 2))
-
-
-def _anything_in_flight(state):
-  return (
-      state.invocation_initial_metadata_in_flight is not None or
-      state.invocation_payloads_in_flight or
-      state.invocation_completion_in_flight is not None or
-      state.service_initial_metadata_in_flight is not None or
-      state.service_payloads_in_flight or
-      state.service_completion_in_flight is not None or
-      0 < state.invocation_allowance_in_flight or
-      0 < state.service_allowance_in_flight
-  )
-
-
-def _verify_service_advance_and_update_state(
-    initial_metadata, payload, completion, allowance, state, implementation):
-  if initial_metadata is not None:
-    if state.invocation_initial_metadata_received:
-      return 'Later invocation initial metadata received: %s' % (
-          initial_metadata,)
-    if state.invocation_payloads_received:
-      return 'Invocation initial metadata received after payloads: %s' % (
-          state.invocation_payloads_received)
-    if state.invocation_completion_received:
-      return 'Invocation initial metadata received after invocation completion!'
-    if not implementation.metadata_transmitted(
-        state.invocation_initial_metadata_in_flight, initial_metadata):
-      return 'Invocation initial metadata maltransmitted: %s, %s' % (
-          state.invocation_initial_metadata_in_flight, initial_metadata)
-    else:
-      state.invocation_initial_metadata_in_flight = None
-      state.invocation_initial_metadata_received = True
-
-  if payload is not None:
-    if state.invocation_completion_received:
-      return 'Invocation payload received after invocation completion!'
-    elif not state.invocation_payloads_in_flight:
-      return 'Invocation payload "%s" received but not in flight!' % (payload,)
-    elif state.invocation_payloads_in_flight[0] != payload:
-      return 'Invocation payload mismatch: %s, %s' % (
-          state.invocation_payloads_in_flight[0], payload)
-    elif state.service_side_invocation_allowance < 1:
-      return 'Disallowed invocation payload!'
-    else:
-      state.invocation_payloads_in_flight.pop(0)
-      state.invocation_payloads_received += 1
-      state.service_side_invocation_allowance -= 1
-
-  if completion is not None:
-    if state.invocation_completion_received:
-      return 'Later invocation completion received: %s' % (completion,)
-    elif not implementation.completion_transmitted(
-        state.invocation_completion_in_flight, completion):
-      return 'Invocation completion maltransmitted: %s, %s' % (
-          state.invocation_completion_in_flight, completion)
-    else:
-      state.invocation_completion_in_flight = None
-      state.invocation_completion_received = True
-
-  if allowance is not None:
-    if allowance <= 0:
-      return 'Illegal allowance value: %s' % (allowance,)
-    else:
-      state.service_allowance_in_flight -= allowance
-      state.service_side_service_allowance += allowance
-
-
-def _verify_invocation_advance_and_update_state(
-    initial_metadata, payload, completion, allowance, state, implementation):
-  if initial_metadata is not None:
-    if state.service_initial_metadata_received:
-      return 'Later service initial metadata received: %s' % (initial_metadata,)
-    if state.service_payloads_received:
-      return 'Service initial metadata received after service payloads: %s' % (
-          state.service_payloads_received)
-    if state.service_completion_received:
-      return 'Service initial metadata received after service completion!'
-    if not implementation.metadata_transmitted(
-        state.service_initial_metadata_in_flight, initial_metadata):
-      return 'Service initial metadata maltransmitted: %s, %s' % (
-          state.service_initial_metadata_in_flight, initial_metadata)
-    else:
-      state.service_initial_metadata_in_flight = None
-      state.service_initial_metadata_received = True
-
-  if payload is not None:
-    if state.service_completion_received:
-      return 'Service payload received after service completion!'
-    elif not state.service_payloads_in_flight:
-      return 'Service payload "%s" received but not in flight!' % (payload,)
-    elif state.service_payloads_in_flight[0] != payload:
-      return 'Service payload mismatch: %s, %s' % (
-          state.invocation_payloads_in_flight[0], payload)
-    elif state.invocation_side_service_allowance < 1:
-      return 'Disallowed service payload!'
-    else:
-      state.service_payloads_in_flight.pop(0)
-      state.service_payloads_received += 1
-      state.invocation_side_service_allowance -= 1
-
-  if completion is not None:
-    if state.service_completion_received:
-      return 'Later service completion received: %s' % (completion,)
-    elif not implementation.completion_transmitted(
-        state.service_completion_in_flight, completion):
-      return 'Service completion maltransmitted: %s, %s' % (
-          state.service_completion_in_flight, completion)
-    else:
-      state.service_completion_in_flight = None
-      state.service_completion_received = True
-
-  if allowance is not None:
-    if allowance <= 0:
-      return 'Illegal allowance value: %s' % (allowance,)
-    else:
-      state.invocation_allowance_in_flight -= allowance
-      state.invocation_side_service_allowance += allowance
-
-
-class Invocation(
-    collections.namedtuple(
-        'Invocation',
-        ('group', 'method', 'subscription_kind', 'timeout', 'initial_metadata',
-         'payload', 'completion',))):
-  """A description of operation invocation.
-
-  Attributes:
-    group: The group identifier for the operation.
-    method: The method identifier for the operation.
-    subscription_kind: A base.Subscription.Kind value describing the kind of
-      subscription to use for the operation.
-    timeout: A duration in seconds to pass as the timeout value for the
-      operation.
-    initial_metadata: An object to pass as the initial metadata for the
-      operation or None.
-    payload: An object to pass as a payload value for the operation or None.
-    completion: An object to pass as a completion value for the operation or
-      None.
-  """
-
-
-class OnAdvance(
-    collections.namedtuple(
-        'OnAdvance',
-        ('kind', 'initial_metadata', 'payload', 'completion', 'allowance'))):
-  """Describes action to be taken in a test in response to an advance call.
-
-  Attributes:
-    kind: A Kind value describing the overall kind of response.
-    initial_metadata: An initial metadata value to pass to a call of the advance
-      method of the operator under test. Only valid if kind is Kind.ADVANCE and
-      may be None.
-    payload: A payload value to pass to a call of the advance method of the
-      operator under test. Only valid if kind is Kind.ADVANCE and may be None.
-    completion: A base.Completion value to pass to a call of the advance method
-      of the operator under test. Only valid if kind is Kind.ADVANCE and may be
-      None.
-    allowance: An allowance value to pass to a call of the advance method of the
-      operator under test. Only valid if kind is Kind.ADVANCE and may be None.
-  """
-
-  @enum.unique
-  class Kind(enum.Enum):
-    ADVANCE = 'advance'
-    DEFECT = 'defect'
-    IDLE = 'idle'
-
-
-_DEFECT_ON_ADVANCE = OnAdvance(OnAdvance.Kind.DEFECT, None, None, None, None)
-_IDLE_ON_ADVANCE = OnAdvance(OnAdvance.Kind.IDLE, None, None, None, None)
-
-
-class Instruction(
-    collections.namedtuple(
-        'Instruction',
-        ('kind', 'advance_args', 'advance_kwargs', 'conclude_success',
-         'conclude_message', 'conclude_invocation_outcome_kind',
-         'conclude_service_outcome_kind',))):
-  """"""
-
-  @enum.unique
-  class Kind(enum.Enum):
-    ADVANCE = 'ADVANCE'
-    CANCEL = 'CANCEL'
-    CONCLUDE = 'CONCLUDE'
-
-
-class Controller(six.with_metaclass(abc.ABCMeta)):
-
-  @abc.abstractmethod
-  def failed(self, message):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def serialize_request(self, request):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def deserialize_request(self, serialized_request):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def serialize_response(self, response):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def deserialize_response(self, serialized_response):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def invocation(self):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def poll(self):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def on_service_advance(
-      self, initial_metadata, payload, completion, allowance):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def on_invocation_advance(
-      self, initial_metadata, payload, completion, allowance):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def service_on_termination(self, outcome):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def invocation_on_termination(self, outcome):
-    """"""
-    raise NotImplementedError()
-
-
-class ControllerCreator(six.with_metaclass(abc.ABCMeta)):
-
-  @abc.abstractmethod
-  def name(self):
-    """"""
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def controller(self, implementation, randomness):
-    """"""
-    raise NotImplementedError()
-
-
-class _Remainder(
-    collections.namedtuple(
-        '_Remainder',
-        ('invocation_payloads', 'service_payloads', 'invocation_completion',
-         'service_completion',))):
-  """Describes work remaining to be done in a portion of a test.
-
-  Attributes:
-    invocation_payloads: The number of payloads to be sent from the invocation
-      side of the operation to the service side of the operation.
-    service_payloads: The number of payloads to be sent from the service side of
-      the operation to the invocation side of the operation.
-    invocation_completion: Whether or not completion from the invocation side of
-      the operation should be indicated and has yet to be indicated.
-    service_completion: Whether or not completion from the service side of the
-      operation should be indicated and has yet to be indicated.
-  """
-
-
-class _SequenceController(Controller):
-
-  def __init__(self, sequence, implementation, randomness):
-    """Constructor.
-
-    Args:
-      sequence: A _sequence.Sequence describing the steps to be taken in the
-        test at a relatively high level.
-      implementation: A test_interfaces.Implementation encapsulating the
-        base interface implementation that is the system under test.
-      randomness: A random.Random instance for use in the test.
-    """
-    self._condition = threading.Condition()
-    self._sequence = sequence
-    self._implementation = implementation
-    self._randomness = randomness
-
-    self._until = None
-    self._remaining_elements = None
-    self._poll_next = None
-    self._message = None
-
-    self._state = _state.OperationState()
-    self._todo = None
-
-  # called with self._condition
-  def _failed(self, message):
-    self._message = message
-    self._condition.notify_all()
-
-  def _passed(self, invocation_outcome, service_outcome):
-    self._poll_next = Instruction(
-        Instruction.Kind.CONCLUDE, None, None, True, None, invocation_outcome,
-        service_outcome)
-    self._condition.notify_all()
-
-  def failed(self, message):
-    with self._condition:
-      self._failed(message)
-
-  def serialize_request(self, request):
-    return request + request
-
-  def deserialize_request(self, serialized_request):
-    return serialized_request[:len(serialized_request) // 2]
-
-  def serialize_response(self, response):
-    return response * 3
-
-  def deserialize_response(self, serialized_response):
-    return serialized_response[2 * len(serialized_response) // 3:]
-
-  def invocation(self):
-    with self._condition:
-      self._until = time.time() + self._sequence.maximum_duration
-      self._remaining_elements = list(self._sequence.elements)
-      if self._sequence.invocation.initial_metadata:
-        initial_metadata = self._implementation.invocation_initial_metadata()
-        self._state.invocation_initial_metadata_in_flight = initial_metadata
-      else:
-        initial_metadata = None
-      if self._sequence.invocation.payload:
-        payload = _create_payload(self._randomness)
-        self._state.invocation_payloads_in_flight.append(payload)
-      else:
-        payload = None
-      if self._sequence.invocation.complete:
-        completion = self._implementation.invocation_completion()
-        self._state.invocation_completion_in_flight = completion
-      else:
-        completion = None
-      return Invocation(
-          _GROUP, _METHOD, base.Subscription.Kind.FULL,
-          self._sequence.invocation.timeout, initial_metadata, payload,
-          completion)
-
-  def poll(self):
-    with self._condition:
-      while True:
-        if self._message is not None:
-          return Instruction(
-              Instruction.Kind.CONCLUDE, None, None, False, self._message, None,
-              None)
-        elif self._poll_next:
-          poll_next = self._poll_next
-          self._poll_next = None
-          return poll_next
-        elif self._until < time.time():
-          return Instruction(
-              Instruction.Kind.CONCLUDE, None, None, False,
-              'overran allotted time!', None, None)
-        else:
-          self._condition.wait(timeout=self._until-time.time())
-
-  def on_service_advance(
-      self, initial_metadata, payload, completion, allowance):
-    with self._condition:
-      message = _verify_service_advance_and_update_state(
-          initial_metadata, payload, completion, allowance, self._state,
-          self._implementation)
-      if message is not None:
-        self._failed(message)
-      if self._todo is not None:
-        raise ValueError('TODO!!!')
-      elif _anything_in_flight(self._state):
-        return _IDLE_ON_ADVANCE
-      elif self._remaining_elements:
-        element = self._remaining_elements.pop(0)
-        if element.kind is _sequence.Element.Kind.SERVICE_TRANSMISSION:
-          if element.transmission.initial_metadata:
-            initial_metadata = self._implementation.service_initial_metadata()
-            self._state.service_initial_metadata_in_flight = initial_metadata
-          else:
-            initial_metadata = None
-          if element.transmission.payload:
-            payload = _create_payload(self._randomness)
-            self._state.service_payloads_in_flight.append(payload)
-            self._state.service_side_service_allowance -= 1
-          else:
-            payload = None
-          if element.transmission.complete:
-            completion = self._implementation.service_completion()
-            self._state.service_completion_in_flight = completion
-          else:
-            completion = None
-          if (not self._state.invocation_completion_received and
-              0 <= self._state.service_side_invocation_allowance):
-            allowance = 1
-            self._state.service_side_invocation_allowance += 1
-            self._state.invocation_allowance_in_flight += 1
-          else:
-            allowance = None
-          return OnAdvance(
-              OnAdvance.Kind.ADVANCE, initial_metadata, payload, completion,
-              allowance)
-        else:
-          raise ValueError('TODO!!!')
-      else:
-        return _IDLE_ON_ADVANCE
-
-  def on_invocation_advance(
-      self, initial_metadata, payload, completion, allowance):
-    with self._condition:
-      message = _verify_invocation_advance_and_update_state(
-          initial_metadata, payload, completion, allowance, self._state,
-          self._implementation)
-      if message is not None:
-        self._failed(message)
-      if self._todo is not None:
-        raise ValueError('TODO!!!')
-      elif _anything_in_flight(self._state):
-        return _IDLE_ON_ADVANCE
-      elif self._remaining_elements:
-        element = self._remaining_elements.pop(0)
-        if element.kind is _sequence.Element.Kind.INVOCATION_TRANSMISSION:
-          if element.transmission.initial_metadata:
-            initial_metadata = self._implementation.invocation_initial_metadata()
-            self._state.invocation_initial_metadata_in_fight = initial_metadata
-          else:
-            initial_metadata = None
-          if element.transmission.payload:
-            payload = _create_payload(self._randomness)
-            self._state.invocation_payloads_in_flight.append(payload)
-            self._state.invocation_side_invocation_allowance -= 1
-          else:
-            payload = None
-          if element.transmission.complete:
-            completion = self._implementation.invocation_completion()
-            self._state.invocation_completion_in_flight = completion
-          else:
-            completion = None
-          if (not self._state.service_completion_received and
-              0 <= self._state.invocation_side_service_allowance):
-            allowance = 1
-            self._state.invocation_side_service_allowance += 1
-            self._state.service_allowance_in_flight += 1
-          else:
-            allowance = None
-          return OnAdvance(
-              OnAdvance.Kind.ADVANCE, initial_metadata, payload, completion,
-              allowance)
-        else:
-          raise ValueError('TODO!!!')
-      else:
-        return _IDLE_ON_ADVANCE
-
-  def service_on_termination(self, outcome):
-    with self._condition:
-      self._state.service_side_outcome = outcome
-      if self._todo is not None or self._remaining_elements:
-        self._failed('Premature service-side outcome %s!' % (outcome,))
-      elif outcome.kind is not self._sequence.outcome_kinds.service:
-        self._failed(
-            'Incorrect service-side outcome kind: %s should have been %s' % (
-                outcome.kind, self._sequence.outcome_kinds.service))
-      elif self._state.invocation_side_outcome is not None:
-        self._passed(self._state.invocation_side_outcome.kind, outcome.kind)
-
-  def invocation_on_termination(self, outcome):
-    with self._condition:
-      self._state.invocation_side_outcome = outcome
-      if self._todo is not None or self._remaining_elements:
-        self._failed('Premature invocation-side outcome %s!' % (outcome,))
-      elif outcome.kind is not self._sequence.outcome_kinds.invocation:
-        self._failed(
-            'Incorrect invocation-side outcome kind: %s should have been %s' % (
-                outcome.kind, self._sequence.outcome_kinds.invocation))
-      elif self._state.service_side_outcome is not None:
-        self._passed(outcome.kind, self._state.service_side_outcome.kind)
-
-
-class _SequenceControllerCreator(ControllerCreator):
-
-  def __init__(self, sequence):
-    self._sequence = sequence
-
-  def name(self):
-    return self._sequence.name
-
-  def controller(self, implementation, randomness):
-    return _SequenceController(self._sequence, implementation, randomness)
-
-
-CONTROLLER_CREATORS = tuple(
-    _SequenceControllerCreator(sequence) for sequence in _sequence.SEQUENCES)
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_sequence.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_sequence.py
deleted file mode 100644
index 571d0e1e63..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_sequence.py
+++ /dev/null
@@ -1,171 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Part of the tests of the base interface of RPC Framework."""
-
-import collections
-import enum
-
-from grpc.framework.interfaces.base import base
-from tests.unit.framework.common import test_constants
-
-
-class Invocation(
-    collections.namedtuple(
-        'Invocation', ('timeout', 'initial_metadata', 'payload', 'complete',))):
-  """A recipe for operation invocation.
-
-  Attributes:
-    timeout: A duration in seconds to pass to the system under test as the
-      operation's timeout value.
-    initial_metadata: A boolean indicating whether or not to pass initial
-      metadata when invoking the operation.
-    payload: A boolean indicating whether or not to pass a payload when
-      invoking the operation.
-    complete: A boolean indicating whether or not to indicate completion of
-      transmissions from the invoking side of the operation when invoking the
-      operation.
-  """
-
-
-class Transmission(
-    collections.namedtuple(
-        'Transmission', ('initial_metadata', 'payload', 'complete',))):
-  """A recipe for a single transmission in an operation.
-
-  Attributes:
-    initial_metadata: A boolean indicating whether or not to pass initial
-      metadata as part of the transmission.
-    payload: A boolean indicating whether or not to pass a payload as part of
-      the transmission.
-    complete: A boolean indicating whether or not to indicate completion of
-      transmission from the transmitting side of the operation as part of the
-      transmission.
-  """
-
-
-class Intertransmission(
-    collections.namedtuple('Intertransmission', ('invocation', 'service',))):
-  """A recipe for multiple transmissions in an operation.
-
-  Attributes:
-    invocation: An integer describing the number of payloads to send from the
-      invocation side of the operation to the service side.
-    service: An integer describing the number of payloads to send from the
-      service side of the operation to the invocation side.
-  """
-
-
-class Element(collections.namedtuple('Element', ('kind', 'transmission',))):
-  """A sum type for steps to perform when testing an operation.
-
-  Attributes:
-    kind: A Kind value describing the kind of step to perform in the test.
-    transmission: Only valid for kinds Kind.INVOCATION_TRANSMISSION and
-      Kind.SERVICE_TRANSMISSION, a Transmission value describing the details of
-      the transmission to be made.
-  """
-
-  @enum.unique
-  class Kind(enum.Enum):
-    INVOCATION_TRANSMISSION = 'invocation transmission'
-    SERVICE_TRANSMISSION = 'service transmission'
-    INTERTRANSMISSION = 'intertransmission'
-    INVOCATION_CANCEL = 'invocation cancel'
-    SERVICE_CANCEL = 'service cancel'
-    INVOCATION_FAILURE = 'invocation failure'
-    SERVICE_FAILURE = 'service failure'
-
-
-class OutcomeKinds(
-    collections.namedtuple('Outcome', ('invocation', 'service',))):
-  """A description of the expected outcome of an operation test.
-
-  Attributes:
-    invocation: The base.Outcome.Kind value expected on the invocation side of
-      the operation.
-    service: The base.Outcome.Kind value expected on the service side of the
-      operation.
-  """
-
-
-class Sequence(
-    collections.namedtuple(
-        'Sequence',
-        ('name', 'maximum_duration', 'invocation', 'elements',
-         'outcome_kinds',))):
-  """Describes at a high level steps to perform in a test.
-
-  Attributes:
-    name: The string name of the sequence.
-    maximum_duration: A length of time in seconds to allow for the test before
-      declaring it to have failed.
-    invocation: An Invocation value describing how to invoke the operation
-      under test.
-    elements: A sequence of Element values describing at coarse granularity
-      actions to take during the operation under test.
-    outcome_kinds: An OutcomeKinds value describing the expected outcome kinds
-      of the test.
-  """
-
-_EASY = Sequence(
-    'Easy',
-    test_constants.TIME_ALLOWANCE,
-    Invocation(test_constants.LONG_TIMEOUT, True, True, True),
-    (
-        Element(
-            Element.Kind.SERVICE_TRANSMISSION, Transmission(True, True, True)),
-    ),
-    OutcomeKinds(base.Outcome.Kind.COMPLETED, base.Outcome.Kind.COMPLETED))
-
-_PEASY = Sequence(
-    'Peasy',
-    test_constants.TIME_ALLOWANCE,
-    Invocation(test_constants.LONG_TIMEOUT, True, True, False),
-    (
-        Element(
-            Element.Kind.SERVICE_TRANSMISSION, Transmission(True, True, False)),
-        Element(
-            Element.Kind.INVOCATION_TRANSMISSION,
-            Transmission(False, True, True)),
-        Element(
-            Element.Kind.SERVICE_TRANSMISSION, Transmission(False, True, True)),
-    ),
-    OutcomeKinds(base.Outcome.Kind.COMPLETED, base.Outcome.Kind.COMPLETED))
-
-
-# TODO(issue 2959): Finish this test suite. This tuple of sequences should
-# contain at least the values in the Cartesian product of (half-duplex,
-# full-duplex) * (zero payloads, one payload, test_constants.STREAM_LENGTH
-# payloads) * (completion, cancellation, expiration, programming defect in
-# servicer code).
-SEQUENCES = (
-    _EASY,
-    _PEASY,
-)
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_state.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_state.py
deleted file mode 100644
index 21cf33aeb6..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/_state.py
+++ /dev/null
@@ -1,55 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Part of the tests of the base interface of RPC Framework."""
-
-
-class OperationState(object):
-
-  def __init__(self):
-    self.invocation_initial_metadata_in_flight = None
-    self.invocation_initial_metadata_received = False
-    self.invocation_payloads_in_flight = []
-    self.invocation_payloads_received = 0
-    self.invocation_completion_in_flight = None
-    self.invocation_completion_received = False
-    self.service_initial_metadata_in_flight = None
-    self.service_initial_metadata_received = False
-    self.service_payloads_in_flight = []
-    self.service_payloads_received = 0
-    self.service_completion_in_flight = None
-    self.service_completion_received = False
-    self.invocation_side_invocation_allowance = 1
-    self.invocation_side_service_allowance = 1
-    self.service_side_invocation_allowance = 1
-    self.service_side_service_allowance = 1
-    self.invocation_allowance_in_flight = 0
-    self.service_allowance_in_flight = 0
-    self.invocation_side_outcome = None
-    self.service_side_outcome = None
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_cases.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_cases.py
deleted file mode 100644
index 5d16bf98be..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_cases.py
+++ /dev/null
@@ -1,279 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Tests of the base interface of RPC Framework."""
-
-from __future__ import division
-
-import logging
-import random
-import threading
-import time
-import unittest
-
-from grpc.framework.foundation import logging_pool
-from grpc.framework.interfaces.base import base
-from grpc.framework.interfaces.base import utilities
-from tests.unit.framework.common import test_constants
-from tests.unit.framework.interfaces.base import _control
-from tests.unit.framework.interfaces.base import test_interfaces
-
-_SYNCHRONICITY_VARIATION = (('Sync', False), ('Async', True))
-
-_EMPTY_OUTCOME_KIND_DICT = {
-    outcome_kind: 0 for outcome_kind in base.Outcome.Kind}
-
-
-class _Serialization(test_interfaces.Serialization):
-
-  def serialize_request(self, request):
-    return request + request
-
-  def deserialize_request(self, serialized_request):
-    return serialized_request[:len(serialized_request) // 2]
-
-  def serialize_response(self, response):
-    return response * 3
-
-  def deserialize_response(self, serialized_response):
-    return serialized_response[2 * len(serialized_response) // 3:]
-
-
-def _advance(quadruples, operator, controller):
-  try:
-    for quadruple in quadruples:
-      operator.advance(
-          initial_metadata=quadruple[0], payload=quadruple[1],
-          completion=quadruple[2], allowance=quadruple[3])
-  except Exception as e:  # pylint: disable=broad-except
-    controller.failed('Exception on advance: %e' % e)
-
-
-class _Operator(base.Operator):
-
-  def __init__(self, controller, on_advance, pool, operator_under_test):
-    self._condition = threading.Condition()
-    self._controller = controller
-    self._on_advance = on_advance
-    self._pool = pool
-    self._operator_under_test = operator_under_test
-    self._pending_advances = []
-
-  def set_operator_under_test(self, operator_under_test):
-    with self._condition:
-      self._operator_under_test = operator_under_test
-      pent_advances = self._pending_advances
-      self._pending_advances = []
-      pool = self._pool
-      controller = self._controller
-
-    if pool is None:
-      _advance(pent_advances, operator_under_test, controller)
-    else:
-      pool.submit(_advance, pent_advances, operator_under_test, controller)
-
-  def advance(
-      self, initial_metadata=None, payload=None, completion=None,
-      allowance=None):
-    on_advance = self._on_advance(
-        initial_metadata, payload, completion, allowance)
-    if on_advance.kind is _control.OnAdvance.Kind.ADVANCE:
-      with self._condition:
-        pool = self._pool
-        operator_under_test = self._operator_under_test
-        controller = self._controller
-
-      quadruple = (
-          on_advance.initial_metadata, on_advance.payload,
-          on_advance.completion, on_advance.allowance)
-      if pool is None:
-        _advance((quadruple,), operator_under_test, controller)
-      else:
-        pool.submit(_advance, (quadruple,), operator_under_test, controller)
-    elif on_advance.kind is _control.OnAdvance.Kind.DEFECT:
-      raise ValueError(
-          'Deliberately raised exception from Operator.advance (in a test)!')
-
-
-class _ProtocolReceiver(base.ProtocolReceiver):
-
-  def __init__(self):
-    self._condition = threading.Condition()
-    self._contexts = []
-
-  def context(self, protocol_context):
-    with self._condition:
-      self._contexts.append(protocol_context)
-
-
-class _Servicer(base.Servicer):
-  """A base.Servicer with instrumented for testing."""
-
-  def __init__(self, group, method, controllers, pool):
-    self._condition = threading.Condition()
-    self._group = group
-    self._method = method
-    self._pool = pool
-    self._controllers = list(controllers)
-
-  def service(self, group, method, context, output_operator):
-    with self._condition:
-      controller = self._controllers.pop(0)
-      if group != self._group or method != self._method:
-        controller.fail(
-            '%s != %s or %s != %s' % (group, self._group, method, self._method))
-        raise base.NoSuchMethodError(None, None)
-      else:
-        operator = _Operator(
-            controller, controller.on_service_advance, self._pool,
-            output_operator)
-        outcome = context.add_termination_callback(
-            controller.service_on_termination)
-        if outcome is not None:
-          controller.service_on_termination(outcome)
-        return utilities.full_subscription(operator, _ProtocolReceiver())
-
-
-class _OperationTest(unittest.TestCase):
-
-  def setUp(self):
-    if self._synchronicity_variation:
-      self._pool = logging_pool.pool(test_constants.POOL_SIZE)
-    else:
-      self._pool = None
-    self._controller = self._controller_creator.controller(
-        self._implementation, self._randomness)
-
-  def tearDown(self):
-    if self._synchronicity_variation:
-      self._pool.shutdown(wait=True)
-    else:
-      self._pool = None
-
-  def test_operation(self):
-    invocation = self._controller.invocation()
-    if invocation.subscription_kind is base.Subscription.Kind.FULL:
-      test_operator = _Operator(
-          self._controller, self._controller.on_invocation_advance,
-          self._pool, None)
-      subscription = utilities.full_subscription(
-          test_operator, _ProtocolReceiver())
-    else:
-      # TODO(nathaniel): support and test other subscription kinds.
-      self.fail('Non-full subscriptions not yet supported!')
-
-    servicer = _Servicer(
-        invocation.group, invocation.method, (self._controller,), self._pool)
-
-    invocation_end, service_end, memo = self._implementation.instantiate(
-        {(invocation.group, invocation.method): _Serialization()}, servicer)
-
-    try:
-      invocation_end.start()
-      service_end.start()
-      operation_context, operator_under_test = invocation_end.operate(
-          invocation.group, invocation.method, subscription, invocation.timeout,
-          initial_metadata=invocation.initial_metadata, payload=invocation.payload,
-          completion=invocation.completion)
-      test_operator.set_operator_under_test(operator_under_test)
-      outcome = operation_context.add_termination_callback(
-          self._controller.invocation_on_termination)
-      if outcome is not None:
-        self._controller.invocation_on_termination(outcome)
-    except Exception as e:  # pylint: disable=broad-except
-      self._controller.failed('Exception on invocation: %s' % e)
-      self.fail(e)
-
-    while True:
-      instruction = self._controller.poll()
-      if instruction.kind is _control.Instruction.Kind.ADVANCE:
-        try:
-          test_operator.advance(
-              *instruction.advance_args, **instruction.advance_kwargs)
-        except Exception as e:  # pylint: disable=broad-except
-          self._controller.failed('Exception on instructed advance: %s' % e)
-      elif instruction.kind is _control.Instruction.Kind.CANCEL:
-        try:
-          operation_context.cancel()
-        except Exception as e:  # pylint: disable=broad-except
-          self._controller.failed('Exception on cancel: %s' % e)
-      elif instruction.kind is _control.Instruction.Kind.CONCLUDE:
-        break
-
-    invocation_stop_event = invocation_end.stop(0)
-    service_stop_event = service_end.stop(0)
-    invocation_stop_event.wait()
-    service_stop_event.wait()
-    invocation_stats = invocation_end.operation_stats()
-    service_stats = service_end.operation_stats()
-
-    self._implementation.destantiate(memo)
-
-    self.assertTrue(
-        instruction.conclude_success, msg=instruction.conclude_message)
-
-    expected_invocation_stats = dict(_EMPTY_OUTCOME_KIND_DICT)
-    expected_invocation_stats[
-        instruction.conclude_invocation_outcome_kind] += 1
-    self.assertDictEqual(expected_invocation_stats, invocation_stats)
-    expected_service_stats = dict(_EMPTY_OUTCOME_KIND_DICT)
-    expected_service_stats[instruction.conclude_service_outcome_kind] += 1
-    self.assertDictEqual(expected_service_stats, service_stats)
-
-
-def test_cases(implementation):
-  """Creates unittest.TestCase classes for a given Base implementation.
-
-  Args:
-    implementation: A test_interfaces.Implementation specifying creation and
-      destruction of the Base implementation under test.
-
-  Returns:
-    A sequence of subclasses of unittest.TestCase defining tests of the
-      specified Base layer implementation.
-  """
-  random_seed = hash(time.time())
-  logging.warning('Random seed for this execution: %s', random_seed)
-  randomness = random.Random(x=random_seed)
-
-  test_case_classes = []
-  for synchronicity_variation in _SYNCHRONICITY_VARIATION:
-    for controller_creator in _control.CONTROLLER_CREATORS:
-      name = ''.join(
-          (synchronicity_variation[0], controller_creator.name(), 'Test',))
-      test_case_classes.append(
-          type(name, (_OperationTest,),
-               {'_implementation': implementation,
-                '_randomness': randomness,
-                '_synchronicity_variation': synchronicity_variation[1],
-                '_controller_creator': controller_creator,
-                '__module__': implementation.__module__,
-               }))
-
-  return test_case_classes
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_interfaces.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_interfaces.py
deleted file mode 100644
index 5eba475ba8..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/base/test_interfaces.py
+++ /dev/null
@@ -1,186 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Interfaces used in tests of implementations of the Base layer."""
-
-import abc
-
-import six
-
-from grpc.framework.interfaces.base import base  # pylint: disable=unused-import
-
-
-class Serialization(six.with_metaclass(abc.ABCMeta)):
-  """Specifies serialization and deserialization of test payloads."""
-
-  def serialize_request(self, request):
-    """Serializes a request value used in a test.
-
-    Args:
-      request: A request value created by a test.
-
-    Returns:
-      A bytestring that is the serialization of the given request.
-    """
-    raise NotImplementedError()
-
-  def deserialize_request(self, serialized_request):
-    """Deserializes a request value used in a test.
-
-    Args:
-      serialized_request: A bytestring that is the serialization of some request
-        used in a test.
-
-    Returns:
-      The request value encoded by the given bytestring.
-    """
-    raise NotImplementedError()
-
-  def serialize_response(self, response):
-    """Serializes a response value used in a test.
-
-    Args:
-      response: A response value created by a test.
-
-    Returns:
-      A bytestring that is the serialization of the given response.
-    """
-    raise NotImplementedError()
-
-  def deserialize_response(self, serialized_response):
-    """Deserializes a response value used in a test.
-
-    Args:
-      serialized_response: A bytestring that is the serialization of some
-        response used in a test.
-
-    Returns:
-      The response value encoded by the given bytestring.
-    """
-    raise NotImplementedError()
-
-
-class Implementation(six.with_metaclass(abc.ABCMeta)):
-  """Specifies an implementation of the Base layer."""
-
-  @abc.abstractmethod
-  def instantiate(self, serializations, servicer):
-    """Instantiates the Base layer implementation to be used in a test.
-
-    Args:
-      serializations: A dict from group-method pair to Serialization object
-        specifying how to serialize and deserialize payload values used in the
-        test.
-      servicer: A base.Servicer object to be called to service RPCs made during
-        the test.
-
-    Returns:
-      A sequence of length three the first element of which is a
-        base.End to be used to invoke RPCs, the second element of which is a
-        base.End to be used to service invoked RPCs, and the third element of
-        which is an arbitrary memo object to be kept and passed to destantiate
-        at the conclusion of the test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def destantiate(self, memo):
-    """Destroys the Base layer implementation under test.
-
-    Args:
-      memo: The object from the third position of the return value of a call to
-        instantiate.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def invocation_initial_metadata(self):
-    """Provides an operation's invocation-side initial metadata.
-
-    Returns:
-      A value to use for an operation's invocation-side initial metadata, or
-        None.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def service_initial_metadata(self):
-    """Provides an operation's service-side initial metadata.
-
-    Returns:
-      A value to use for an operation's service-side initial metadata, or
-        None.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def invocation_completion(self):
-    """Provides an operation's invocation-side completion.
-
-    Returns:
-      A base.Completion to use for an operation's invocation-side completion.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def service_completion(self):
-    """Provides an operation's service-side completion.
-
-    Returns:
-      A base.Completion to use for an operation's service-side completion.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def metadata_transmitted(self, original_metadata, transmitted_metadata):
-    """Identifies whether or not metadata was properly transmitted.
-
-    Args:
-      original_metadata: A metadata value passed to the system under test.
-      transmitted_metadata: The same metadata value after having been
-        transmitted through the system under test.
-
-    Returns:
-      Whether or not the metadata was properly transmitted.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def completion_transmitted(self, original_completion, transmitted_completion):
-    """Identifies whether or not a base.Completion was properly transmitted.
-
-    Args:
-      original_completion: A base.Completion passed to the system under test.
-      transmitted_completion: The same completion value after having been
-        transmitted through the system under test.
-
-    Returns:
-      Whether or not the completion was properly transmitted.
-    """
-    raise NotImplementedError()
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/face/_receiver.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/face/_receiver.py
deleted file mode 100644
index 48f31fc677..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/face/_receiver.py
+++ /dev/null
@@ -1,95 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""A utility useful in tests of asynchronous, event-driven interfaces."""
-
-import threading
-
-from grpc.framework.interfaces.face import face
-
-
-class Receiver(face.ResponseReceiver):
-  """A utility object useful in tests of asynchronous code."""
-
-  def __init__(self):
-    self._condition = threading.Condition()
-    self._initial_metadata = None
-    self._responses = []
-    self._terminal_metadata = None
-    self._code = None
-    self._details = None
-    self._completed = False
-    self._abortion = None
-
-  def abort(self, abortion):
-    with self._condition:
-      self._abortion = abortion
-      self._condition.notify_all()
-
-  def initial_metadata(self, initial_metadata):
-    with self._condition:
-      self._initial_metadata = initial_metadata
-
-  def response(self, response):
-    with self._condition:
-      self._responses.append(response)
-
-  def complete(self, terminal_metadata, code, details):
-    with self._condition:
-      self._terminal_metadata = terminal_metadata
-      self._code = code
-      self._details = details
-      self._completed = True
-      self._condition.notify_all()
-
-  def block_until_terminated(self):
-    with self._condition:
-      while self._abortion is None and not self._completed:
-        self._condition.wait()
-
-  def unary_response(self):
-    with self._condition:
-      if self._abortion is not None:
-        raise AssertionError('Aborted: "{}"!'.format(self._abortion))
-      elif len(self._responses) != 1:
-        raise AssertionError(
-            '%d responses received, not exactly one!', len(self._responses))
-      else:
-        return self._responses[0]
-
-  def stream_responses(self):
-    with self._condition:
-      if self._abortion is None:
-        return list(self._responses)
-      else:
-        raise AssertionError('Aborted: "{}"!'.format(self._abortion))
-
-  def abortion(self):
-    with self._condition:
-      return self._abortion
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/links/__init__.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/links/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/links/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/links/test_cases.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/links/test_cases.py
deleted file mode 100644
index 608e64119e..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/links/test_cases.py
+++ /dev/null
@@ -1,327 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""Tests of the links interface of RPC Framework."""
-
-# unittest is referenced from specification in this module.
-import abc
-import unittest  # pylint: disable=unused-import
-
-import six
-
-from grpc.framework.interfaces.links import links
-from tests.unit.framework.common import test_constants
-from tests.unit.framework.interfaces.links import test_utilities
-
-
-def at_least_n_payloads_received_predicate(n):
-  def predicate(ticket_sequence):
-    payload_count = 0
-    for ticket in ticket_sequence:
-      if ticket.payload is not None:
-        payload_count += 1
-        if n <= payload_count:
-          return True
-    else:
-      return False
-  return predicate
-
-
-def terminated(ticket_sequence):
-  return ticket_sequence and ticket_sequence[-1].termination is not None
-
-_TRANSMISSION_GROUP = 'test.Group'
-_TRANSMISSION_METHOD = 'TestMethod'
-
-
-class TransmissionTest(six.with_metaclass(abc.ABCMeta)):
-  """Tests ticket transmission between two connected links.
-
-  This class must be mixed into a unittest.TestCase that implements the abstract
-  methods it provides.
-  """
-
-  # This is a unittest.TestCase mix-in.
-  # pylint: disable=invalid-name
-
-  @abc.abstractmethod
-  def create_transmitting_links(self):
-    """Creates two connected links for use in this test.
-
-    Returns:
-      Two links.Links, the first of which will be used on the invocation side
-        of RPCs and the second of which will be used on the service side of
-        RPCs.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def destroy_transmitting_links(self, invocation_side_link, service_side_link):
-    """Destroys the two connected links created for this test.
-
-
-    Args:
-      invocation_side_link: The link used on the invocation side of RPCs in
-        this test.
-      service_side_link: The link used on the service side of RPCs in this
-        test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def create_invocation_initial_metadata(self):
-    """Creates a value for use as invocation-side initial metadata.
-
-    Returns:
-      A metadata value appropriate for use as invocation-side initial metadata
-        or None if invocation-side initial metadata transmission is not
-        supported by the links under test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def create_invocation_terminal_metadata(self):
-    """Creates a value for use as invocation-side terminal metadata.
-
-    Returns:
-      A metadata value appropriate for use as invocation-side terminal
-        metadata or None if invocation-side terminal metadata transmission is
-        not supported by the links under test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def create_service_initial_metadata(self):
-    """Creates a value for use as service-side initial metadata.
-
-    Returns:
-      A metadata value appropriate for use as service-side initial metadata or
-        None if service-side initial metadata transmission is not supported by
-        the links under test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def create_service_terminal_metadata(self):
-    """Creates a value for use as service-side terminal metadata.
-
-    Returns:
-      A metadata value appropriate for use as service-side terminal metadata or
-        None if service-side terminal metadata transmission is not supported by
-        the links under test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def create_invocation_completion(self):
-    """Creates values for use as invocation-side code and message.
-
-    Returns:
-      An invocation-side code value and an invocation-side message value.
-        Either or both may be None if invocation-side code and/or
-        invocation-side message transmission is not supported by the links
-        under test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def create_service_completion(self):
-    """Creates values for use as service-side code and message.
-
-    Returns:
-      A service-side code value and a service-side message value. Either or
-        both may be None if service-side code and/or service-side message
-        transmission is not supported by the links under test.
-    """
-    raise NotImplementedError()
-
-  @abc.abstractmethod
-  def assertMetadataTransmitted(self, original_metadata, transmitted_metadata):
-    """Asserts that transmitted_metadata contains original_metadata.
-
-    Args:
-      original_metadata: A metadata object used in this test.
-      transmitted_metadata: A metadata object obtained after transmission
-        through the system under test.
-
-    Raises:
-      AssertionError: if the transmitted_metadata object does not contain
-        original_metadata.
-    """
-    raise NotImplementedError()
-
-  def group_and_method(self):
-    """Returns the group and method used in this test case.
-
-    Returns:
-      A pair of the group and method used in this test case.
-    """
-    return _TRANSMISSION_GROUP, _TRANSMISSION_METHOD
-
-  def serialize_request(self, request):
-    """Serializes a request value used in this test case.
-
-    Args:
-      request: A request value created by this test case.
-
-    Returns:
-      A bytestring that is the serialization of the given request.
-    """
-    return request
-
-  def deserialize_request(self, serialized_request):
-    """Deserializes a request value used in this test case.
-
-    Args:
-      serialized_request: A bytestring that is the serialization of some request
-        used in this test case.
-
-    Returns:
-      The request value encoded by the given bytestring.
-    """
-    return serialized_request
-
-  def serialize_response(self, response):
-    """Serializes a response value used in this test case.
-
-    Args:
-      response: A response value created by this test case.
-
-    Returns:
-      A bytestring that is the serialization of the given response.
-    """
-    return response
-
-  def deserialize_response(self, serialized_response):
-    """Deserializes a response value used in this test case.
-
-    Args:
-      serialized_response: A bytestring that is the serialization of some
-        response used in this test case.
-
-    Returns:
-      The response value encoded by the given bytestring.
-    """
-    return serialized_response
-
-  def _assert_is_valid_metadata_payload_sequence(
-      self, ticket_sequence, payloads, initial_metadata, terminal_metadata):
-    initial_metadata_seen = False
-    seen_payloads = []
-    terminal_metadata_seen = False
-
-    for ticket in ticket_sequence:
-      if ticket.initial_metadata is not None:
-        self.assertFalse(initial_metadata_seen)
-        self.assertFalse(seen_payloads)
-        self.assertFalse(terminal_metadata_seen)
-        self.assertMetadataTransmitted(initial_metadata, ticket.initial_metadata)
-        initial_metadata_seen = True
-
-      if ticket.payload is not None:
-        self.assertFalse(terminal_metadata_seen)
-        seen_payloads.append(ticket.payload)
-
-      if ticket.terminal_metadata is not None:
-        self.assertFalse(terminal_metadata_seen)
-        self.assertMetadataTransmitted(terminal_metadata, ticket.terminal_metadata)
-        terminal_metadata_seen = True
-    self.assertSequenceEqual(payloads, seen_payloads)
-
-  def _assert_is_valid_invocation_sequence(
-      self, ticket_sequence, group, method, payloads, initial_metadata,
-      terminal_metadata, termination):
-    self.assertLess(0, len(ticket_sequence))
-    self.assertEqual(group, ticket_sequence[0].group)
-    self.assertEqual(method, ticket_sequence[0].method)
-    self._assert_is_valid_metadata_payload_sequence(
-        ticket_sequence, payloads, initial_metadata, terminal_metadata)
-    self.assertIs(termination, ticket_sequence[-1].termination)
-
-  def _assert_is_valid_service_sequence(
-      self, ticket_sequence, payloads, initial_metadata, terminal_metadata,
-      code, message, termination):
-    self.assertLess(0, len(ticket_sequence))
-    self._assert_is_valid_metadata_payload_sequence(
-        ticket_sequence, payloads, initial_metadata, terminal_metadata)
-    self.assertEqual(code, ticket_sequence[-1].code)
-    self.assertEqual(message, ticket_sequence[-1].message)
-    self.assertIs(termination, ticket_sequence[-1].termination)
-
-  def setUp(self):
-    self._invocation_link, self._service_link = self.create_transmitting_links()
-    self._invocation_mate = test_utilities.RecordingLink()
-    self._service_mate = test_utilities.RecordingLink()
-    self._invocation_link.join_link(self._invocation_mate)
-    self._service_link.join_link(self._service_mate)
-
-  def tearDown(self):
-    self.destroy_transmitting_links(self._invocation_link, self._service_link)
-
-  def testSimplestRoundTrip(self):
-    """Tests transmission of one ticket in each direction."""
-    invocation_operation_id = object()
-    invocation_payload = b'\x07' * 1023
-    timeout = test_constants.LONG_TIMEOUT
-    invocation_initial_metadata = self.create_invocation_initial_metadata()
-    invocation_terminal_metadata = self.create_invocation_terminal_metadata()
-    invocation_code, invocation_message = self.create_invocation_completion()
-    service_payload = b'\x08' * 1025
-    service_initial_metadata = self.create_service_initial_metadata()
-    service_terminal_metadata = self.create_service_terminal_metadata()
-    service_code, service_message = self.create_service_completion()
-
-    original_invocation_ticket = links.Ticket(
-        invocation_operation_id, 0, _TRANSMISSION_GROUP, _TRANSMISSION_METHOD,
-        links.Ticket.Subscription.FULL, timeout, 0, invocation_initial_metadata,
-        invocation_payload, invocation_terminal_metadata, invocation_code,
-        invocation_message, links.Ticket.Termination.COMPLETION, None)
-    self._invocation_link.accept_ticket(original_invocation_ticket)
-
-    self._service_mate.block_until_tickets_satisfy(
-        at_least_n_payloads_received_predicate(1))
-    service_operation_id = self._service_mate.tickets()[0].operation_id
-
-    self._service_mate.block_until_tickets_satisfy(terminated)
-    self._assert_is_valid_invocation_sequence(
-        self._service_mate.tickets(), _TRANSMISSION_GROUP, _TRANSMISSION_METHOD,
-        (invocation_payload,), invocation_initial_metadata,
-        invocation_terminal_metadata, links.Ticket.Termination.COMPLETION)
-
-    original_service_ticket = links.Ticket(
-        service_operation_id, 0, None, None, links.Ticket.Subscription.FULL,
-        timeout, 0, service_initial_metadata, service_payload,
-        service_terminal_metadata, service_code, service_message,
-        links.Ticket.Termination.COMPLETION, None)
-    self._service_link.accept_ticket(original_service_ticket)
-    self._invocation_mate.block_until_tickets_satisfy(terminated)
-    self._assert_is_valid_service_sequence(
-        self._invocation_mate.tickets(), (service_payload,),
-        service_initial_metadata, service_terminal_metadata, service_code,
-        service_message, links.Ticket.Termination.COMPLETION)
diff --git a/src/python/grpcio_tests/tests/unit/framework/interfaces/links/test_utilities.py b/src/python/grpcio_tests/tests/unit/framework/interfaces/links/test_utilities.py
deleted file mode 100644
index 39c7f2fc63..0000000000
--- a/src/python/grpcio_tests/tests/unit/framework/interfaces/links/test_utilities.py
+++ /dev/null
@@ -1,167 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior appropriate for use in tests."""
-
-import logging
-import threading
-import time
-
-from grpc.framework.interfaces.links import links
-from grpc.framework.interfaces.links import utilities
-
-# A more-or-less arbitrary limit on the length of raw data values to be logged.
-_UNCOMFORTABLY_LONG = 48
-
-
-def _safe_for_log_ticket(ticket):
-  """Creates a safe-for-printing-to-the-log ticket for a given ticket.
-
-  Args:
-    ticket: Any links.Ticket.
-
-  Returns:
-    A links.Ticket that is as much as can be equal to the given ticket but
-      possibly features values like the string "<payload of length 972321>" in
-      place of the actual values of the given ticket.
-  """
-  if isinstance(ticket.payload, (basestring,)):
-    payload_length = len(ticket.payload)
-  else:
-    payload_length = -1
-  if payload_length < _UNCOMFORTABLY_LONG:
-    return ticket
-  else:
-    return links.Ticket(
-        ticket.operation_id, ticket.sequence_number,
-        ticket.group, ticket.method, ticket.subscription, ticket.timeout,
-        ticket.allowance, ticket.initial_metadata,
-        '<payload of length {}>'.format(payload_length),
-        ticket.terminal_metadata, ticket.code, ticket.message,
-        ticket.termination, None)
-
-
-class RecordingLink(links.Link):
-  """A Link that records every ticket passed to it."""
-
-  def __init__(self):
-    self._condition = threading.Condition()
-    self._tickets = []
-
-  def accept_ticket(self, ticket):
-    with self._condition:
-      self._tickets.append(ticket)
-      self._condition.notify_all()
-
-  def join_link(self, link):
-    pass
-
-  def block_until_tickets_satisfy(self, predicate):
-    """Blocks until the received tickets satisfy the given predicate.
-
-    Args:
-      predicate: A callable that takes a sequence of tickets and returns a
-        boolean value.
-    """
-    with self._condition:
-      while not predicate(self._tickets):
-        self._condition.wait()
-
-  def tickets(self):
-    """Returns a copy of the list of all tickets received by this Link."""
-    with self._condition:
-      return tuple(self._tickets)
-
-
-class _Pipe(object):
-  """A conduit that logs all tickets passed through it."""
-
-  def __init__(self, name):
-    self._lock = threading.Lock()
-    self._name = name
-    self._left_mate = utilities.NULL_LINK
-    self._right_mate = utilities.NULL_LINK
-
-  def accept_left_to_right_ticket(self, ticket):
-    with self._lock:
-      logging.warning(
-          '%s: moving left to right through %s: %s', time.time(), self._name,
-          _safe_for_log_ticket(ticket))
-      try:
-        self._right_mate.accept_ticket(ticket)
-      except Exception as e:  # pylint: disable=broad-except
-        logging.exception(e)
-
-  def accept_right_to_left_ticket(self, ticket):
-    with self._lock:
-      logging.warning(
-          '%s: moving right to left through %s: %s', time.time(), self._name,
-          _safe_for_log_ticket(ticket))
-      try:
-        self._left_mate.accept_ticket(ticket)
-      except Exception as e:  # pylint: disable=broad-except
-        logging.exception(e)
-
-  def join_left_mate(self, left_mate):
-    with self._lock:
-      self._left_mate = utilities.NULL_LINK if left_mate is None else left_mate
-
-  def join_right_mate(self, right_mate):
-    with self._lock:
-      self._right_mate = (
-          utilities.NULL_LINK if right_mate is None else right_mate)
-
-
-class _Facade(links.Link):
-
-  def __init__(self, accept, join):
-    self._accept = accept
-    self._join = join
-
-  def accept_ticket(self, ticket):
-    self._accept(ticket)
-
-  def join_link(self, link):
-    self._join(link)
-
-
-def logging_links(name):
-  """Creates a conduit that logs all tickets passed through it.
-
-  Args:
-    name: A name to use for the conduit to identify itself in logging output.
-
-  Returns:
-    Two links.Links, the first of which is the "left" side of the conduit
-      and the second of which is the "right" side of the conduit.
-  """
-  pipe = _Pipe(name)
-  left_facade = _Facade(pipe.accept_left_to_right_ticket, pipe.join_left_mate)
-  right_facade = _Facade(pipe.accept_right_to_left_ticket, pipe.join_right_mate)
-  return left_facade, right_facade