| # 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)) |