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# 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)
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