Eliminate the Python "assembly" package

This completes issue #726. All that cascading activation stuff just
didn't work out as cleanly as I had hoped it would.

10 files changed, 141 insertions, 926 deletions

diff --git a/src/python/src/grpc/_adapter/fore.py b/src/python/src/grpc/_adapter/fore.py
index 6ef9e60006..339c0ef216 100644
--- a/src/python/src/grpc/_adapter/fore.py
+++ b/src/python/src/grpc/_adapter/fore.py
@@ -357,90 +357,3 @@ class ForeLink(ticket_interfaces.ForeLink, activated.Activated):
         self._complete(ticket.operation_id, ticket.payload)
       else:
         self._cancel(ticket.operation_id)
-
-
-class _ActivatedForeLink(ticket_interfaces.ForeLink, activated.Activated):
-
-  def __init__(
-      self, port, request_deserializers, response_serializers,
-      root_certificates, key_chain_pairs):
-    self._port = port
-    self._request_deserializers = request_deserializers
-    self._response_serializers = response_serializers
-    self._root_certificates = root_certificates
-    self._key_chain_pairs = key_chain_pairs
-
-    self._lock = threading.Lock()
-    self._pool = None
-    self._fore_link = None
-    self._rear_link = null.NULL_REAR_LINK
-
-  def join_rear_link(self, rear_link):
-    with self._lock:
-      self._rear_link = null.NULL_REAR_LINK if rear_link is None else rear_link
-      if self._fore_link is not None:
-        self._fore_link.join_rear_link(rear_link)
-
-  def _start(self):
-    with self._lock:
-      self._pool = logging_pool.pool(_THREAD_POOL_SIZE)
-      self._fore_link = ForeLink(
-          self._pool, self._request_deserializers, self._response_serializers,
-          self._root_certificates, self._key_chain_pairs, port=self._port)
-      self._fore_link.join_rear_link(self._rear_link)
-      self._fore_link.start()
-      return self
-
-  def _stop(self):
-    with self._lock:
-      self._fore_link.stop()
-      self._fore_link = None
-      self._pool.shutdown(wait=True)
-      self._pool = None
-
-  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 port(self):
-    with self._lock:
-      return None if self._fore_link is None else self._fore_link.port()
-
-  def accept_back_to_front_ticket(self, ticket):
-    with self._lock:
-      if self._fore_link is not None:
-        self._fore_link.accept_back_to_front_ticket(ticket)
-
-
-def activated_fore_link(
-    port, request_deserializers, response_serializers, root_certificates,
-    key_chain_pairs):
-  """Creates a ForeLink that is also an activated.Activated.
-
-  The returned object is only valid for use between calls to its start and stop
-  methods (or in context when used as a context manager).
-
-  Args:
-    port: The port on which to serve RPCs, or None for a port to be
-      automatically selected.
-    request_deserializers: A dictionary from RPC method names to request object
-      deserializer behaviors.
-    response_serializers: A dictionary from RPC method names to response object
-      serializer behaviors.
-    root_certificates: The PEM-encoded client root certificates as a bytestring
-      or None.
-    key_chain_pairs: A sequence of PEM-encoded private key-certificate chain
-      pairs.
-  """
-  return _ActivatedForeLink(
-      port, request_deserializers, response_serializers, root_certificates,
-      key_chain_pairs)
diff --git a/src/python/src/grpc/_adapter/rear.py b/src/python/src/grpc/_adapter/rear.py
index fc71bf0a6c..62703fab30 100644
--- a/src/python/src/grpc/_adapter/rear.py
+++ b/src/python/src/grpc/_adapter/rear.py
@@ -387,127 +387,3 @@ class RearLink(ticket_interfaces.RearLink, activated.Activated):
       else:
         # NOTE(nathaniel): All other categories are treated as cancellation.
         self._cancel(ticket.operation_id)
-
-
-class _ActivatedRearLink(ticket_interfaces.RearLink, activated.Activated):
-
-  def __init__(
-      self, host, port, request_serializers, response_deserializers, secure,
-      root_certificates, private_key, certificate_chain,
-      server_host_override=None):
-    self._host = host
-    self._port = port
-    self._request_serializers = request_serializers
-    self._response_deserializers = response_deserializers
-    self._secure = secure
-    self._root_certificates = root_certificates
-    self._private_key = private_key
-    self._certificate_chain = certificate_chain
-    self._server_host_override = server_host_override
-
-    self._lock = threading.Lock()
-    self._pool = None
-    self._rear_link = None
-    self._fore_link = null.NULL_FORE_LINK
-
-  def join_fore_link(self, fore_link):
-    with self._lock:
-      self._fore_link = null.NULL_FORE_LINK if fore_link is None else fore_link
-      if self._rear_link is not None:
-        self._rear_link.join_fore_link(self._fore_link)
-
-  def _start(self):
-    with self._lock:
-      self._pool = logging_pool.pool(_THREAD_POOL_SIZE)
-      self._rear_link = RearLink(
-          self._host, self._port, self._pool, self._request_serializers,
-          self._response_deserializers, self._secure, self._root_certificates,
-          self._private_key, self._certificate_chain,
-          server_host_override=self._server_host_override)
-      self._rear_link.join_fore_link(self._fore_link)
-      self._rear_link.start()
-    return self
-
-  def _stop(self):
-    with self._lock:
-      self._rear_link.stop()
-      self._rear_link = None
-      self._pool.shutdown(wait=True)
-      self._pool = None
-
-  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 accept_front_to_back_ticket(self, ticket):
-    with self._lock:
-      if self._rear_link is not None:
-        self._rear_link.accept_front_to_back_ticket(ticket)
-
-
-# TODO(issue 726): reconcile these two creation functions.
-def activated_rear_link(
-    host, port, request_serializers, response_deserializers):
-  """Creates a RearLink that is also an activated.Activated.
-
-  The returned object is only valid for use between calls to its start and stop
-  methods (or in context when used as a context manager).
-
-  Args:
-    host: The host to which to connect for RPC service.
-    port: The port to which to connect for RPC service.
-    request_serializers: A dictionary from RPC method name to request object
-      serializer behavior.
-    response_deserializers: A dictionary from RPC method name to response
-      object deserializer behavior.
-    secure: A boolean indicating whether or not to use a secure connection.
-    root_certificates: The PEM-encoded root certificates or None to ask for
-      them to be retrieved from a default location.
-    private_key: The PEM-encoded private key to use or None if no private key
-      should be used.
-    certificate_chain: The PEM-encoded certificate chain to use or None if no
-      certificate chain should be used.
-  """
-  return _ActivatedRearLink(
-      host, port, request_serializers, response_deserializers, False, None,
-      None, None)
-
-
-
-def secure_activated_rear_link(
-    host, port, request_serializers, response_deserializers, root_certificates,
-    private_key, certificate_chain, server_host_override=None):
-  """Creates a RearLink that is also an activated.Activated.
-
-  The returned object is only valid for use between calls to its start and stop
-  methods (or in context when used as a context manager).
-
-  Args:
-    host: The host to which to connect for RPC service.
-    port: The port to which to connect for RPC service.
-    request_serializers: A dictionary from RPC method name to request object
-      serializer behavior.
-    response_deserializers: A dictionary from RPC method name to response
-      object deserializer behavior.
-    root_certificates: The PEM-encoded root certificates or None to ask for
-      them to be retrieved from a default location.
-    private_key: The PEM-encoded private key to use or None if no private key
-      should be used.
-    certificate_chain: The PEM-encoded certificate chain to use or None if no
-      certificate chain should be used.
-    server_host_override: (For testing only) the target name used for SSL
-      host name checking.
-  """
-  return _ActivatedRearLink(
-      host, port, request_serializers, response_deserializers, True,
-      root_certificates, private_key, certificate_chain,
-      server_host_override=server_host_override)
diff --git a/src/python/src/grpc/early_adopter/_reexport.py b/src/python/src/grpc/early_adopter/_reexport.py
index 3fed8099f6..f3416028e8 100644
--- a/src/python/src/grpc/early_adopter/_reexport.py
+++ b/src/python/src/grpc/early_adopter/_reexport.py
@@ -174,45 +174,6 @@ class _StreamUnarySyncAsync(interfaces.StreamUnarySyncAsync):
     return _ReexportedFuture(self._underlying.future(request_iterator, timeout))
 
 
-class _Stub(interfaces.Stub):
-
-  def __init__(self, assembly_stub, cardinalities):
-    self._assembly_stub = assembly_stub
-    self._cardinalities = cardinalities
-
-  def __enter__(self):
-    self._assembly_stub.__enter__()
-    return self
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    self._assembly_stub.__exit__(exc_type, exc_val, exc_tb)
-    return False
-
-  def __getattr__(self, attr):
-    underlying_attr = self._assembly_stub.__getattr__(attr)
-    method_cardinality = self._cardinalities.get(attr)
-    # TODO(nathaniel): unify this trick with its other occurrence in the code.
-    if method_cardinality is None:
-      for name, method_cardinality in self._cardinalities.iteritems():
-        last_slash_index = name.rfind('/')
-        if 0 <= last_slash_index and name[last_slash_index + 1:] == attr:
-          break
-      else:
-        raise AttributeError(attr)
-    if method_cardinality is interfaces.Cardinality.UNARY_UNARY:
-      return _UnaryUnarySyncAsync(underlying_attr)
-    elif method_cardinality is interfaces.Cardinality.UNARY_STREAM:
-      return lambda request, timeout: _CancellableIterator(
-          underlying_attr(request, timeout))
-    elif method_cardinality is interfaces.Cardinality.STREAM_UNARY:
-      return _StreamUnarySyncAsync(underlying_attr)
-    elif method_cardinality is interfaces.Cardinality.STREAM_STREAM:
-      return lambda request_iterator, timeout: _CancellableIterator(
-          underlying_attr(request_iterator, timeout))
-    else:
-      raise AttributeError(attr)
-
-
 def common_cardinalities(early_adopter_cardinalities):
   common_cardinalities = {}
   for name, early_adopter_cardinality in early_adopter_cardinalities.iteritems():
@@ -225,5 +186,13 @@ def rpc_context(face_rpc_context):
   return _RpcContext(face_rpc_context)
 
 
-def stub(face_stub, cardinalities):
-  return _Stub(face_stub, cardinalities)
+def cancellable_iterator(face_cancellable_iterator):
+  return _CancellableIterator(face_cancellable_iterator)
+
+
+def unary_unary_sync_async(face_unary_unary_multi_callable):
+  return _UnaryUnarySyncAsync(face_unary_unary_multi_callable)
+
+
+def stream_unary_sync_async(face_stream_unary_multi_callable):
+  return _StreamUnarySyncAsync(face_stream_unary_multi_callable)
diff --git a/src/python/src/grpc/early_adopter/implementations.py b/src/python/src/grpc/early_adopter/implementations.py
index b46f94e9fb..1c02f9e4d6 100644
--- a/src/python/src/grpc/early_adopter/implementations.py
+++ b/src/python/src/grpc/early_adopter/implementations.py
@@ -36,7 +36,13 @@ from grpc._adapter import rear as _rear
 from grpc.early_adopter import _face_utilities
 from grpc.early_adopter import _reexport
 from grpc.early_adopter import interfaces
-from grpc.framework.assembly import implementations as _assembly_implementations
+from grpc.framework.base import util as _base_utilities
+from grpc.framework.base.packets import implementations as _tickets_implementations
+from grpc.framework.face import implementations as _face_implementations
+from grpc.framework.foundation import logging_pool
+
+_THREAD_POOL_SIZE = 80
+_ONE_DAY_IN_SECONDS = 24 * 60 * 60
 
 
 class _Server(interfaces.Server):
@@ -50,30 +56,39 @@ class _Server(interfaces.Server):
     else:
       self._key_chain_pairs = ((private_key, certificate_chain),)
 
+    self._pool = None
+    self._back = None
     self._fore_link = None
-    self._server = None
 
   def _start(self):
     with self._lock:
-      if self._server is None:
-        self._fore_link = _fore.activated_fore_link(
-            self._port, self._breakdown.request_deserializers,
+      if self._pool is None:
+        self._pool = logging_pool.pool(_THREAD_POOL_SIZE)
+        servicer = _face_implementations.servicer(
+            self._pool, self._breakdown.implementations, None)
+        self._back = _tickets_implementations.back(
+            servicer, self._pool, self._pool, self._pool, _ONE_DAY_IN_SECONDS,
+            _ONE_DAY_IN_SECONDS)
+        self._fore_link = _fore.ForeLink(
+            self._pool, self._breakdown.request_deserializers,
             self._breakdown.response_serializers, None, self._key_chain_pairs)
-
-        self._server = _assembly_implementations.assemble_service(
-            self._breakdown.implementations, self._fore_link)
-        self._server.start()
+        self._back.join_fore_link(self._fore_link)
+        self._fore_link.join_rear_link(self._back)
+        self._fore_link.start()
       else:
         raise ValueError('Server currently running!')
 
   def _stop(self):
     with self._lock:
-      if self._server is None:
+      if self._pool is None:
         raise ValueError('Server not running!')
       else:
-        self._server.stop()
-        self._server = None
+        self._fore_link.stop()
+        _base_utilities.wait_for_idle(self._back)
+        self._pool.shutdown(wait=True)
         self._fore_link = None
+        self._back = None
+        self._pool = None
 
   def __enter__(self):
     self._start()
@@ -93,11 +108,101 @@ class _Server(interfaces.Server):
     with self._lock:
       return self._fore_link.port()
 
-def _build_stub(breakdown, activated_rear_link):
-  assembly_stub = _assembly_implementations.assemble_dynamic_inline_stub(
-      _reexport.common_cardinalities(breakdown.cardinalities),
-      activated_rear_link)
-  return _reexport.stub(assembly_stub, breakdown.cardinalities)
+
+class _Stub(interfaces.Stub):
+
+  def __init__(
+      self, breakdown, host, port, secure, root_certificates, private_key,
+      certificate_chain, server_host_override=None):
+    self._lock = threading.Lock()
+    self._breakdown = breakdown
+    self._host = host
+    self._port = port
+    self._secure = secure
+    self._root_certificates = root_certificates
+    self._private_key = private_key
+    self._certificate_chain = certificate_chain
+    self._server_host_override = server_host_override
+
+    self._pool = None
+    self._front = None
+    self._rear_link = None
+    self._understub = None
+
+  def __enter__(self):
+    with self._lock:
+      if self._pool is None:
+        self._pool = logging_pool.pool(_THREAD_POOL_SIZE)
+        self._front = _tickets_implementations.front(
+            self._pool, self._pool, self._pool)
+        self._rear_link = _rear.RearLink(
+            self._host, self._port, self._pool,
+            self._breakdown.request_serializers,
+            self._breakdown.response_deserializers, self._secure,
+            self._root_certificates, self._private_key, self._certificate_chain,
+            server_host_override=self._server_host_override)
+        self._front.join_rear_link(self._rear_link)
+        self._rear_link.join_fore_link(self._front)
+        self._rear_link.start()
+        self._understub = _face_implementations.dynamic_stub(
+            _reexport.common_cardinalities(self._breakdown.cardinalities),
+            self._front, self._pool, '')
+      else:
+        raise ValueError('Tried to __enter__ already-__enter__ed Stub!')
+    return self
+
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    with self._lock:
+      if self._pool is None:
+        raise ValueError('Tried to __exit__ non-__enter__ed Stub!')
+      else:
+        self._rear_link.stop()
+        _base_utilities.wait_for_idle(self._front)
+        self._pool.shutdown(wait=True)
+        self._rear_link = None
+        self._front = None
+        self._pool = None
+        self._understub = None
+    return False
+
+  def __getattr__(self, attr):
+    with self._lock:
+      if self._pool is None:
+        raise ValueError('Tried to __getattr__ non-__enter__ed Stub!')
+      else:
+        underlying_attr = getattr(self._understub, attr, None)
+        method_cardinality = self._breakdown.cardinalities.get(attr)
+        # TODO(nathaniel): Eliminate this trick.
+        if underlying_attr is None:
+          for method_name, method_cardinality in self._breakdown.cardinalities.iteritems():
+            last_slash_index = method_name.rfind('/')
+            if 0 <= last_slash_index and method_name[last_slash_index + 1:] == attr:
+              underlying_attr = getattr(self._understub, method_name)
+              break
+          else:
+            raise AttributeError(attr)
+        if method_cardinality is interfaces.Cardinality.UNARY_UNARY:
+          return _reexport.unary_unary_sync_async(underlying_attr)
+        elif method_cardinality is interfaces.Cardinality.UNARY_STREAM:
+          return lambda request, timeout: _reexport.cancellable_iterator(
+              underlying_attr(request, timeout))
+        elif method_cardinality is interfaces.Cardinality.STREAM_UNARY:
+          return _reexport.stream_unary_sync_async(underlying_attr)
+        elif method_cardinality is interfaces.Cardinality.STREAM_STREAM:
+          return lambda request_iterator, timeout: (
+              _reexport.cancellable_iterator(underlying_attr(
+                  request_iterator, timeout)))
+        else:
+          raise AttributeError(attr)
+
+
+def _build_stub(
+    methods, host, port, secure, root_certificates, private_key,
+    certificate_chain, server_host_override=None):
+  breakdown = _face_utilities.break_down_invocation(methods)
+  return _Stub(
+      breakdown, host, port, secure, root_certificates, private_key,
+      certificate_chain, server_host_override=server_host_override)
 
 
 def _build_server(methods, port, private_key, certificate_chain):
@@ -118,11 +223,7 @@ def insecure_stub(methods, host, port):
   Returns:
     An interfaces.Stub affording RPC invocation.
   """
-  breakdown = _face_utilities.break_down_invocation(methods)
-  activated_rear_link = _rear.activated_rear_link(
-      host, port, breakdown.request_serializers,
-      breakdown.response_deserializers)
-  return _build_stub(breakdown, activated_rear_link)
+  return _build_stub(methods, host, port, False, None, None, None)
 
 
 def secure_stub(
@@ -148,12 +249,9 @@ def secure_stub(
   Returns:
     An interfaces.Stub affording RPC invocation.
   """
-  breakdown = _face_utilities.break_down_invocation(methods)
-  activated_rear_link = _rear.secure_activated_rear_link(
-      host, port, breakdown.request_serializers,
-      breakdown.response_deserializers, root_certificates, private_key,
+  return _build_stub(
+      methods, host, port, True, root_certificates, private_key,
       certificate_chain, server_host_override=server_host_override)
-  return _build_stub(breakdown, activated_rear_link)
 
 
 def insecure_server(methods, port):
diff --git a/src/python/src/grpc/framework/assembly/__init__.py b/src/python/src/grpc/framework/assembly/__init__.py
deleted file mode 100644
index 7086519106..0000000000
--- a/src/python/src/grpc/framework/assembly/__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/src/grpc/framework/assembly/implementations.py b/src/python/src/grpc/framework/assembly/implementations.py
deleted file mode 100644
index 24afcbeb6d..0000000000
--- a/src/python/src/grpc/framework/assembly/implementations.py
+++ /dev/null
@@ -1,264 +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 for assembling RPC framework values."""
-
-import threading
-
-# tickets_interfaces, face_interfaces, and activated are referenced from
-# specification in this module.
-from grpc.framework.assembly import interfaces
-from grpc.framework.base import util as base_utilities
-from grpc.framework.base.packets import implementations as tickets_implementations
-from grpc.framework.base.packets import interfaces as tickets_interfaces  # pylint: disable=unused-import
-from grpc.framework.common import cardinality
-from grpc.framework.common import style
-from grpc.framework.face import implementations as face_implementations
-from grpc.framework.face import interfaces as face_interfaces  # pylint: disable=unused-import
-from grpc.framework.face import utilities as face_utilities
-from grpc.framework.foundation import activated  # pylint: disable=unused-import
-from grpc.framework.foundation import logging_pool
-
-_ONE_DAY_IN_SECONDS = 60 * 60 * 24
-_THREAD_POOL_SIZE = 100
-
-
-class _FaceStub(object):
-
-  def __init__(self, rear_link):
-    self._rear_link = rear_link
-    self._lock = threading.Lock()
-    self._pool = None
-    self._front = None
-    self._under_stub = None
-
-  def __enter__(self):
-    with self._lock:
-      self._pool = logging_pool.pool(_THREAD_POOL_SIZE)
-      self._front = tickets_implementations.front(
-          self._pool, self._pool, self._pool)
-      self._rear_link.start()
-      self._rear_link.join_fore_link(self._front)
-      self._front.join_rear_link(self._rear_link)
-      self._under_stub = face_implementations.generic_stub(self._front, self._pool)
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    with self._lock:
-      self._under_stub = None
-      self._rear_link.stop()
-      base_utilities.wait_for_idle(self._front)
-      self._front = None
-      self._pool.shutdown(wait=True)
-      self._pool = None
-    return False
-
-  def __getattr__(self, attr):
-    with self._lock:
-      if self._under_stub is None:
-        raise ValueError('Called out of context!')
-      else:
-        return getattr(self._under_stub, attr)
-
-
-def _behaviors(method_cardinalities, front, pool):
-  behaviors = {}
-  stub = face_implementations.generic_stub(front, pool)
-  for name, method_cardinality in method_cardinalities.iteritems():
-    if method_cardinality is cardinality.Cardinality.UNARY_UNARY:
-      behaviors[name] = stub.unary_unary_multi_callable(name)
-    elif method_cardinality is cardinality.Cardinality.UNARY_STREAM:
-      behaviors[name] = lambda request, context, bound_name=name: (
-          stub.inline_value_in_stream_out(bound_name, request, context))
-    elif method_cardinality is cardinality.Cardinality.STREAM_UNARY:
-      behaviors[name] = stub.stream_unary_multi_callable(name)
-    elif method_cardinality is cardinality.Cardinality.STREAM_STREAM:
-      behaviors[name] = lambda request_iterator, context, bound_name=name: (
-          stub.inline_stream_in_stream_out(
-              bound_name, request_iterator, context))
-  return behaviors
-
-
-class _DynamicInlineStub(object):
-
-  def __init__(self, cardinalities, rear_link):
-    self._cardinalities = cardinalities
-    self._rear_link = rear_link
-    self._lock = threading.Lock()
-    self._pool = None
-    self._front = None
-    self._behaviors = None
-
-  def __enter__(self):
-    with self._lock:
-      self._pool = logging_pool.pool(_THREAD_POOL_SIZE)
-      self._front = tickets_implementations.front(
-          self._pool, self._pool, self._pool)
-      self._rear_link.start()
-      self._rear_link.join_fore_link(self._front)
-      self._front.join_rear_link(self._rear_link)
-      self._behaviors = _behaviors(
-          self._cardinalities, self._front, self._pool)
-      return self
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    with self._lock:
-      self._behaviors = None
-      self._rear_link.stop()
-      base_utilities.wait_for_idle(self._front)
-      self._front = None
-      self._pool.shutdown(wait=True)
-      self._pool = None
-    return False
-
-  def __getattr__(self, attr):
-    with self._lock:
-      behavior = self._behaviors.get(attr)
-      if behavior is None:
-        for name, behavior in self._behaviors.iteritems():
-          last_slash_index = name.rfind('/')
-          if 0 <= last_slash_index and name[last_slash_index + 1:] == attr:
-            return behavior
-        else:
-          raise AttributeError(
-              '_DynamicInlineStub instance has no attribute "%s"!' % attr)
-      else:
-        return behavior
-
-
-class _ServiceAssembly(interfaces.Server):
-
-  def __init__(self, implementations, fore_link):
-    self._implementations = implementations
-    self._fore_link = fore_link
-    self._lock = threading.Lock()
-    self._pool = None
-    self._back = None
-
-  def _start(self):
-    with self._lock:
-      self._pool = logging_pool.pool(_THREAD_POOL_SIZE)
-      servicer = face_implementations.servicer(
-          self._pool, self._implementations, None)
-      self._back = tickets_implementations.back(
-          servicer, self._pool, self._pool, self._pool, _ONE_DAY_IN_SECONDS,
-          _ONE_DAY_IN_SECONDS)
-      self._fore_link.start()
-      self._fore_link.join_rear_link(self._back)
-      self._back.join_fore_link(self._fore_link)
-
-  def _stop(self):
-    with self._lock:
-      self._fore_link.stop()
-      base_utilities.wait_for_idle(self._back)
-      self._back = None
-      self._pool.shutdown(wait=True)
-      self._pool = None
-
-  def __enter__(self):
-    self._start()
-    return self
-
-  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 port(self):
-    with self._lock:
-      return self._fore_link.port()
-
-
-def assemble_face_stub(activated_rear_link):
-  """Assembles a face_interfaces.GenericStub.
-
-  The returned object is a context manager and may only be used in context to
-  invoke RPCs.
-
-  Args:
-    activated_rear_link: An object that is both a tickets_interfaces.RearLink
-      and an activated.Activated. The object should be in the inactive state
-      when passed to this method.
-
-  Returns:
-    A face_interfaces.GenericStub on which, in context, RPCs can be invoked.
-  """
-  return _FaceStub(activated_rear_link)
-
-
-def assemble_dynamic_inline_stub(cardinalities, activated_rear_link):
-  """Assembles a stub with method names for attributes.
-
-  The returned object is a context manager and may only be used in context to
-  invoke RPCs.
-
-  The returned object, when used in context, will respond to attribute access
-  as follows: if the requested attribute is the name of a unary-unary RPC
-  method, the value of the attribute will be a
-  face_interfaces.UnaryUnaryMultiCallable with which to invoke the RPC method.
-  If the requested attribute is the name of a unary-stream RPC method, the
-  value of the attribute will be a face_interfaces.UnaryStreamMultiCallable
-  with which to invoke the RPC method. If the requested attribute is the name
-  of a stream-unary RPC method, the value of the attribute will be a
-  face_interfaces.StreamUnaryMultiCallable with which to invoke the RPC method.
-  If the requested attribute is the name of a stream-stream RPC method, the
-  value of the attribute will be a face_interfaces.StreamStreamMultiCallable
-  with which to invoke the RPC method.
-
-  Args:
-    cardinalities: A dictionary from RPC method name to cardinality.Cardinality
-      value identifying the cardinality of the named RPC method.
-    activated_rear_link: An object that is both a tickets_interfaces.RearLink
-      and an activated.Activated. The object should be in the inactive state
-      when passed to this method.
-
-  Returns:
-    A face_interfaces.DynamicStub on which, in context, RPCs can be invoked.
-  """
-  return _DynamicInlineStub(cardinalities, activated_rear_link)
-
-
-def assemble_service(implementations, activated_fore_link):
-  """Assembles the service-side of the RPC Framework stack.
-
-  Args:
-    implementations: A dictionary from RPC method name to
-      face_interfaces.MethodImplementation.
-    activated_fore_link: An object that is both a tickets_interfaces.ForeLink
-      and an activated.Activated. The object should be in the inactive state
-      when passed to this method.
-
-  Returns:
-    An interfaces.Server encapsulating RPC service.
-  """
-  return _ServiceAssembly(implementations, activated_fore_link)
diff --git a/src/python/src/grpc/framework/assembly/implementations_test.py b/src/python/src/grpc/framework/assembly/implementations_test.py
deleted file mode 100644
index 5540edff7a..0000000000
--- a/src/python/src/grpc/framework/assembly/implementations_test.py
+++ /dev/null
@@ -1,288 +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): Expand this test coverage.
-
-"""Test of the GRPC-backed ForeLink and RearLink."""
-
-import threading
-import unittest
-
-from grpc.framework.assembly import implementations
-from grpc.framework.base import interfaces
-from grpc.framework.base.packets import packets as tickets
-from grpc.framework.base.packets import interfaces as tickets_interfaces
-from grpc.framework.base.packets import null
-from grpc.framework.face import utilities as face_utilities
-from grpc.framework.foundation import logging_pool
-from grpc._junkdrawer import math_pb2
-
-DIV = 'Div'
-DIV_MANY = 'DivMany'
-FIB = 'Fib'
-SUM = 'Sum'
-
-def _fibbonacci(limit):
-  left, right = 0, 1
-  for _ in xrange(limit):
-    yield left
-    left, right = right, left + right
-
-
-def _div(request, unused_context):
-  return math_pb2.DivReply(
-      quotient=request.dividend / request.divisor,
-      remainder=request.dividend % request.divisor)
-
-
-def _div_many(request_iterator, unused_context):
-  for request in request_iterator:
-    yield math_pb2.DivReply(
-        quotient=request.dividend / request.divisor,
-        remainder=request.dividend % request.divisor)
-
-
-def _fib(request, unused_context):
-  for number in _fibbonacci(request.limit):
-    yield math_pb2.Num(num=number)
-
-
-def _sum(request_iterator, unused_context):
-  accumulation = 0
-  for request in request_iterator:
-    accumulation += request.num
-  return math_pb2.Num(num=accumulation)
-
-
-_IMPLEMENTATIONS = {
-    DIV: face_utilities.unary_unary_inline(_div),
-    DIV_MANY: face_utilities.stream_stream_inline(_div_many),
-    FIB: face_utilities.unary_stream_inline(_fib),
-    SUM: face_utilities.stream_unary_inline(_sum),
-}
-
-_CARDINALITIES = {
-    name: implementation.cardinality
-    for name, implementation in _IMPLEMENTATIONS.iteritems()}
-
-_TIMEOUT = 10
-
-
-class PipeLink(tickets_interfaces.ForeLink, tickets_interfaces.RearLink):
-
-  def __init__(self):
-    self._fore_lock = threading.Lock()
-    self._fore_link = null.NULL_FORE_LINK
-    self._rear_lock = threading.Lock()
-    self._rear_link = null.NULL_REAR_LINK
-
-  def __enter__(self):
-    return self
-
-  def __exit__(self, exc_type, exc_val, exc_tb):
-    return False
-
-  def start(self):
-    pass
-
-  def stop(self):
-    pass
-
-  def accept_back_to_front_ticket(self, ticket):
-    with self._fore_lock:
-      self._fore_link.accept_back_to_front_ticket(ticket)
-
-  def join_rear_link(self, rear_link):
-    with self._rear_lock:
-      self._rear_link = null.NULL_REAR_LINK if rear_link is None else rear_link
-
-  def accept_front_to_back_ticket(self, ticket):
-    with self._rear_lock:
-      self._rear_link.accept_front_to_back_ticket(ticket)
-
-  def join_fore_link(self, fore_link):
-    with self._fore_lock:
-      self._fore_link = null.NULL_FORE_LINK if fore_link is None else fore_link
-
-
-class FaceStubTest(unittest.TestCase):
-
-  def testUnaryUnary(self):
-    divisor = 7
-    dividend = 13
-    expected_quotient = 1
-    expected_remainder = 6
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    face_stub = implementations.assemble_face_stub(pipe)
-
-    service.start()
-    try:
-      with face_stub:
-        response = face_stub.blocking_value_in_value_out(
-            DIV, math_pb2.DivArgs(divisor=divisor, dividend=dividend),
-            _TIMEOUT)
-        self.assertEqual(expected_quotient, response.quotient)
-        self.assertEqual(expected_remainder, response.remainder)
-    finally:
-      service.stop()
-
-  def testUnaryStream(self):
-    stream_length = 29
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    face_stub = implementations.assemble_face_stub(pipe)
-
-    with service, face_stub:
-      responses = list(
-          face_stub.inline_value_in_stream_out(
-              FIB, math_pb2.FibArgs(limit=stream_length), _TIMEOUT))
-      numbers = [response.num for response in responses]
-      for early, middle, later in zip(numbers, numbers[1:], numbers[2:]):
-        self.assertEqual(early + middle, later)
-
-  def testStreamUnary(self):
-    stream_length = 13
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    face_stub = implementations.assemble_face_stub(pipe)
-
-    with service, face_stub:
-      multi_callable = face_stub.stream_unary_multi_callable(SUM)
-      response_future = multi_callable.future(
-          (math_pb2.Num(num=index) for index in range(stream_length)),
-          _TIMEOUT)
-      self.assertEqual(
-          (stream_length * (stream_length - 1)) / 2,
-          response_future.result().num)
-
-  def testStreamStream(self):
-    stream_length = 17
-    divisor_offset = 7
-    dividend_offset = 17
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    face_stub = implementations.assemble_face_stub(pipe)
-
-    with service, face_stub:
-      response_iterator = face_stub.inline_stream_in_stream_out(
-          DIV_MANY,
-          (math_pb2.DivArgs(
-               divisor=divisor_offset + index,
-               dividend=dividend_offset + index)
-           for index in range(stream_length)),
-          _TIMEOUT)
-      for index, response in enumerate(response_iterator):
-        self.assertEqual(
-            (dividend_offset + index) / (divisor_offset + index),
-            response.quotient)
-        self.assertEqual(
-            (dividend_offset + index) % (divisor_offset + index),
-            response.remainder)
-      self.assertEqual(stream_length, index + 1)
-
-
-class DynamicInlineStubTest(unittest.TestCase):
-
-  def testUnaryUnary(self):
-    divisor = 59
-    dividend = 973
-    expected_quotient = dividend / divisor
-    expected_remainder = dividend % divisor
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    dynamic_stub = implementations.assemble_dynamic_inline_stub(
-        _CARDINALITIES, pipe)
-
-    service.start()
-    with dynamic_stub:
-      response = dynamic_stub.Div(
-          math_pb2.DivArgs(divisor=divisor, dividend=dividend), _TIMEOUT)
-      self.assertEqual(expected_quotient, response.quotient)
-      self.assertEqual(expected_remainder, response.remainder)
-    service.stop()
-
-  def testUnaryStream(self):
-    stream_length = 43
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    dynamic_stub = implementations.assemble_dynamic_inline_stub(
-        _CARDINALITIES, pipe)
-
-    with service, dynamic_stub:
-      response_iterator = dynamic_stub.Fib(
-          math_pb2.FibArgs(limit=stream_length), _TIMEOUT)
-      numbers = tuple(response.num for response in response_iterator)
-      for early, middle, later in zip(numbers, numbers[:1], numbers[:2]):
-        self.assertEqual(early + middle, later)
-      self.assertEqual(stream_length, len(numbers))
-
-  def testStreamUnary(self):
-    stream_length = 127
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    dynamic_stub = implementations.assemble_dynamic_inline_stub(
-        _CARDINALITIES, pipe)
-
-    with service, dynamic_stub:
-      response_future = dynamic_stub.Sum.future(
-          (math_pb2.Num(num=index) for index in range(stream_length)),
-          _TIMEOUT)
-      self.assertEqual(
-          (stream_length * (stream_length - 1)) / 2,
-          response_future.result().num)
-
-  def testStreamStream(self):
-    stream_length = 179
-    divisor_offset = 71
-    dividend_offset = 1763
-    pipe = PipeLink()
-    service = implementations.assemble_service(_IMPLEMENTATIONS, pipe)
-    dynamic_stub = implementations.assemble_dynamic_inline_stub(
-        _CARDINALITIES, pipe)
-
-    with service, dynamic_stub:
-      response_iterator = dynamic_stub.DivMany(
-          (math_pb2.DivArgs(
-               divisor=divisor_offset + index,
-               dividend=dividend_offset + index)
-           for index in range(stream_length)),
-          _TIMEOUT)
-      for index, response in enumerate(response_iterator):
-        self.assertEqual(
-            (dividend_offset + index) / (divisor_offset + index),
-            response.quotient)
-        self.assertEqual(
-            (dividend_offset + index) % (divisor_offset + index),
-            response.remainder)
-      self.assertEqual(stream_length, index + 1)
-
-
-if __name__ == '__main__':
-  unittest.main()
diff --git a/src/python/src/grpc/framework/assembly/interfaces.py b/src/python/src/grpc/framework/assembly/interfaces.py
deleted file mode 100644
index c469dc4fd2..0000000000
--- a/src/python/src/grpc/framework/assembly/interfaces.py
+++ /dev/null
@@ -1,58 +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): The assembly layer only exists to smooth out wrinkles in
-# the face layer. The two should be squashed together as soon as manageable.
-"""Interfaces for assembling RPC Framework values."""
-
-import abc
-
-from grpc.framework.foundation import activated
-
-
-class Server(activated.Activated):
-  """The server interface.
-
-  Aside from being able to be activated and deactivated, objects of this type
-  are able to report the port on which they are servicing RPCs.
-  """
-  __metaclass__ = abc.ABCMeta
-
-  # TODO(issue 726): This is an abstraction violation; not every Server is
-  # necessarily serving over a network at all.
-  @abc.abstractmethod
-  def port(self):
-    """Identifies the port on which this Server is servicing RPCs.
-
-    This method may only be called while the server is active.
-
-    Returns:
-      The number of the port on which this Server is servicing RPCs.
-    """
-    raise NotImplementedError()
diff --git a/src/python/src/grpc/framework/face/implementations.py b/src/python/src/grpc/framework/face/implementations.py
index e8d91a3c91..4a6de52974 100644
--- a/src/python/src/grpc/framework/face/implementations.py
+++ b/src/python/src/grpc/framework/face/implementations.py
@@ -213,14 +213,14 @@ class _DynamicStub(interfaces.DynamicStub):
     self._pool = pool
 
   def __getattr__(self, attr):
-    cardinality = self._cardinalities.get(attr)
-    if cardinality is cardinality.Cardinality.UNARY_UNARY:
+    method_cardinality = self._cardinalities.get(attr)
+    if method_cardinality is cardinality.Cardinality.UNARY_UNARY:
       return _UnaryUnaryMultiCallable(self._front, attr)
-    elif cardinality is cardinality.Cardinality.UNARY_STREAM:
+    elif method_cardinality is cardinality.Cardinality.UNARY_STREAM:
       return _UnaryStreamMultiCallable(self._front, attr)
-    elif cardinality is cardinality.Cardinality.STREAM_UNARY:
+    elif method_cardinality is cardinality.Cardinality.STREAM_UNARY:
       return _StreamUnaryMultiCallable(self._front, attr, self._pool)
-    elif cardinality is cardinality.Cardinality.STREAM_STREAM:
+    elif method_cardinality is cardinality.Cardinality.STREAM_STREAM:
       return _StreamStreamMultiCallable(self._front, attr, self._pool)
     else:
       raise AttributeError('_DynamicStub object has no attribute "%s"!' % attr)
@@ -315,4 +315,4 @@ def dynamic_stub(cardinalities, front, pool, prefix):
     An interfaces.DynamicStub that performs RPCs via the given
       base_interfaces.Front.
   """
-  return _DynamicStub(cardinalities, front, pool, prefix)
+  return _DynamicStub(cardinalities, front, pool)
diff --git a/src/python/src/setup.py b/src/python/src/setup.py
index cdb82a9dc3..a513a2811b 100644
--- a/src/python/src/setup.py
+++ b/src/python/src/setup.py
@@ -64,7 +64,6 @@ _PACKAGES = (
     'grpc._junkdrawer',
     'grpc.early_adopter',
     'grpc.framework',
-    'grpc.framework.assembly',
     'grpc.framework.base',
     'grpc.framework.base.packets',
     'grpc.framework.common',