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# Copyright 2019 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import enum
cdef str _GRPC_ASYNCIO_ENGINE = os.environ.get('GRPC_ASYNCIO_ENGINE', 'poller').upper()
cdef _AioState _global_aio_state = _AioState()
class AsyncIOEngine(enum.Enum):
# NOTE(lidiz) the support for custom_io_manager is removed in favor of the
# EventEngine project, which will be the only IO platform in Core.
CUSTOM_IO_MANAGER = 'custom_io_manager'
POLLER = 'poller'
cdef _default_asyncio_engine():
return AsyncIOEngine.POLLER
cdef grpc_completion_queue *global_completion_queue():
return _global_aio_state.cq.c_ptr()
cdef class _AioState:
def __cinit__(self):
self.lock = threading.RLock()
self.refcount = 0
self.engine = None
self.cq = None
cdef _initialize_poller():
# Initializes gRPC Core, must be called before other Core API
grpc_init()
# Creates the only completion queue
_global_aio_state.cq = PollerCompletionQueue()
cdef _actual_aio_initialization():
# Picks the engine for gRPC AsyncIO Stack
_global_aio_state.engine = AsyncIOEngine.__members__.get(
_GRPC_ASYNCIO_ENGINE,
_default_asyncio_engine(),
)
_LOGGER.debug('Using %s as I/O engine', _global_aio_state.engine)
# Initializes the process-level state accordingly
if _global_aio_state.engine is AsyncIOEngine.POLLER:
_initialize_poller()
else:
raise ValueError('Unsupported engine type [%s]' % _global_aio_state.engine)
def _grpc_shutdown_wrapper(_):
"""A thin Python wrapper of Core's shutdown function.
Define functions are not allowed in "cdef" functions, and Cython complains
about a simple lambda with a C function.
"""
grpc_shutdown()
cdef _actual_aio_shutdown():
if _global_aio_state.engine is AsyncIOEngine.POLLER:
(<PollerCompletionQueue>_global_aio_state.cq).shutdown()
grpc_shutdown()
else:
raise ValueError('Unsupported engine type [%s]' % _global_aio_state.engine)
cdef _initialize_per_loop():
cdef object loop = get_working_loop()
if _global_aio_state.engine is AsyncIOEngine.POLLER:
_global_aio_state.cq.bind_loop(loop)
cpdef init_grpc_aio():
"""Initializes the gRPC AsyncIO module.
Expected to be invoked on critical class constructors.
E.g., AioChannel, AioServer.
"""
with _global_aio_state.lock:
_global_aio_state.refcount += 1
if _global_aio_state.refcount == 1:
_actual_aio_initialization()
_initialize_per_loop()
cpdef shutdown_grpc_aio():
"""Shuts down the gRPC AsyncIO module.
Expected to be invoked on critical class destructors.
E.g., AioChannel, AioServer.
"""
with _global_aio_state.lock:
assert _global_aio_state.refcount > 0
_global_aio_state.refcount -= 1
if not _global_aio_state.refcount:
_actual_aio_shutdown()
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