839 lines
31 KiB
Python
839 lines
31 KiB
Python
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# Copyright 2016 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Service-side implementation of gRPC Python."""
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import collections
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import enum
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import logging
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import threading
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import time
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import six
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import grpc
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from grpc import _common
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from grpc import _interceptor
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from grpc._cython import cygrpc
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from grpc.framework.foundation import callable_util
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_LOGGER = logging.getLogger(__name__)
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_SHUTDOWN_TAG = 'shutdown'
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_REQUEST_CALL_TAG = 'request_call'
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_RECEIVE_CLOSE_ON_SERVER_TOKEN = 'receive_close_on_server'
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_SEND_INITIAL_METADATA_TOKEN = 'send_initial_metadata'
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_RECEIVE_MESSAGE_TOKEN = 'receive_message'
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_SEND_MESSAGE_TOKEN = 'send_message'
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_SEND_INITIAL_METADATA_AND_SEND_MESSAGE_TOKEN = (
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'send_initial_metadata * send_message')
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_SEND_STATUS_FROM_SERVER_TOKEN = 'send_status_from_server'
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_SEND_INITIAL_METADATA_AND_SEND_STATUS_FROM_SERVER_TOKEN = (
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'send_initial_metadata * send_status_from_server')
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_OPEN = 'open'
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_CLOSED = 'closed'
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_CANCELLED = 'cancelled'
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_EMPTY_FLAGS = 0
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_UNEXPECTED_EXIT_SERVER_GRACE = 1.0
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def _serialized_request(request_event):
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return request_event.batch_operations[0].message()
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def _application_code(code):
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cygrpc_code = _common.STATUS_CODE_TO_CYGRPC_STATUS_CODE.get(code)
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return cygrpc.StatusCode.unknown if cygrpc_code is None else cygrpc_code
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def _completion_code(state):
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if state.code is None:
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return cygrpc.StatusCode.ok
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else:
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return _application_code(state.code)
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def _abortion_code(state, code):
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if state.code is None:
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return code
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else:
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return _application_code(state.code)
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def _details(state):
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return b'' if state.details is None else state.details
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class _HandlerCallDetails(
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collections.namedtuple('_HandlerCallDetails', (
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'method',
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'invocation_metadata',
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)), grpc.HandlerCallDetails):
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pass
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class _RPCState(object):
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def __init__(self):
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self.condition = threading.Condition()
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self.due = set()
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self.request = None
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self.client = _OPEN
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self.initial_metadata_allowed = True
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self.disable_next_compression = False
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self.trailing_metadata = None
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self.code = None
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self.details = None
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self.statused = False
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self.rpc_errors = []
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self.callbacks = []
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self.abortion = None
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def _raise_rpc_error(state):
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rpc_error = grpc.RpcError()
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state.rpc_errors.append(rpc_error)
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raise rpc_error
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def _possibly_finish_call(state, token):
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state.due.remove(token)
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if (state.client is _CANCELLED or state.statused) and not state.due:
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callbacks = state.callbacks
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state.callbacks = None
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return state, callbacks
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else:
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return None, ()
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def _send_status_from_server(state, token):
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def send_status_from_server(unused_send_status_from_server_event):
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with state.condition:
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return _possibly_finish_call(state, token)
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return send_status_from_server
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def _abort(state, call, code, details):
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if state.client is not _CANCELLED:
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effective_code = _abortion_code(state, code)
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effective_details = details if state.details is None else state.details
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if state.initial_metadata_allowed:
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operations = (
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cygrpc.SendInitialMetadataOperation(None, _EMPTY_FLAGS),
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cygrpc.SendStatusFromServerOperation(
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state.trailing_metadata, effective_code, effective_details,
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_EMPTY_FLAGS),
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)
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token = _SEND_INITIAL_METADATA_AND_SEND_STATUS_FROM_SERVER_TOKEN
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else:
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operations = (cygrpc.SendStatusFromServerOperation(
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state.trailing_metadata, effective_code, effective_details,
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_EMPTY_FLAGS),)
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token = _SEND_STATUS_FROM_SERVER_TOKEN
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call.start_server_batch(operations,
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_send_status_from_server(state, token))
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state.statused = True
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state.due.add(token)
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def _receive_close_on_server(state):
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def receive_close_on_server(receive_close_on_server_event):
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with state.condition:
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if receive_close_on_server_event.batch_operations[0].cancelled():
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state.client = _CANCELLED
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elif state.client is _OPEN:
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state.client = _CLOSED
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state.condition.notify_all()
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return _possibly_finish_call(state, _RECEIVE_CLOSE_ON_SERVER_TOKEN)
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return receive_close_on_server
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def _receive_message(state, call, request_deserializer):
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def receive_message(receive_message_event):
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serialized_request = _serialized_request(receive_message_event)
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if serialized_request is None:
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with state.condition:
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if state.client is _OPEN:
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state.client = _CLOSED
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state.condition.notify_all()
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return _possibly_finish_call(state, _RECEIVE_MESSAGE_TOKEN)
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else:
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request = _common.deserialize(serialized_request,
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request_deserializer)
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with state.condition:
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if request is None:
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_abort(state, call, cygrpc.StatusCode.internal,
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b'Exception deserializing request!')
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else:
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state.request = request
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state.condition.notify_all()
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return _possibly_finish_call(state, _RECEIVE_MESSAGE_TOKEN)
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return receive_message
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def _send_initial_metadata(state):
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def send_initial_metadata(unused_send_initial_metadata_event):
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with state.condition:
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return _possibly_finish_call(state, _SEND_INITIAL_METADATA_TOKEN)
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return send_initial_metadata
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def _send_message(state, token):
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def send_message(unused_send_message_event):
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with state.condition:
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state.condition.notify_all()
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return _possibly_finish_call(state, token)
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return send_message
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class _Context(grpc.ServicerContext):
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def __init__(self, rpc_event, state, request_deserializer):
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self._rpc_event = rpc_event
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self._state = state
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self._request_deserializer = request_deserializer
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def is_active(self):
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with self._state.condition:
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return self._state.client is not _CANCELLED and not self._state.statused
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def time_remaining(self):
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return max(self._rpc_event.call_details.deadline - time.time(), 0)
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def cancel(self):
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self._rpc_event.call.cancel()
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def add_callback(self, callback):
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with self._state.condition:
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if self._state.callbacks is None:
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return False
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else:
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self._state.callbacks.append(callback)
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return True
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def disable_next_message_compression(self):
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with self._state.condition:
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self._state.disable_next_compression = True
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def invocation_metadata(self):
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return self._rpc_event.invocation_metadata
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def peer(self):
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return _common.decode(self._rpc_event.call.peer())
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def peer_identities(self):
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return cygrpc.peer_identities(self._rpc_event.call)
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def peer_identity_key(self):
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id_key = cygrpc.peer_identity_key(self._rpc_event.call)
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return id_key if id_key is None else _common.decode(id_key)
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def auth_context(self):
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return {
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_common.decode(key): value
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for key, value in six.iteritems(
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cygrpc.auth_context(self._rpc_event.call))
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}
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def send_initial_metadata(self, initial_metadata):
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with self._state.condition:
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if self._state.client is _CANCELLED:
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_raise_rpc_error(self._state)
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else:
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if self._state.initial_metadata_allowed:
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operation = cygrpc.SendInitialMetadataOperation(
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initial_metadata, _EMPTY_FLAGS)
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self._rpc_event.call.start_server_batch(
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(operation,), _send_initial_metadata(self._state))
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self._state.initial_metadata_allowed = False
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self._state.due.add(_SEND_INITIAL_METADATA_TOKEN)
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else:
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raise ValueError('Initial metadata no longer allowed!')
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def set_trailing_metadata(self, trailing_metadata):
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with self._state.condition:
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self._state.trailing_metadata = trailing_metadata
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def abort(self, code, details):
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# treat OK like other invalid arguments: fail the RPC
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if code == grpc.StatusCode.OK:
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_LOGGER.error(
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'abort() called with StatusCode.OK; returning UNKNOWN')
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code = grpc.StatusCode.UNKNOWN
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details = ''
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with self._state.condition:
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self._state.code = code
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self._state.details = _common.encode(details)
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self._state.abortion = Exception()
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raise self._state.abortion
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def set_code(self, code):
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with self._state.condition:
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self._state.code = code
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def set_details(self, details):
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with self._state.condition:
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self._state.details = _common.encode(details)
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class _RequestIterator(object):
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def __init__(self, state, call, request_deserializer):
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self._state = state
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self._call = call
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self._request_deserializer = request_deserializer
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def _raise_or_start_receive_message(self):
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if self._state.client is _CANCELLED:
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_raise_rpc_error(self._state)
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elif self._state.client is _CLOSED or self._state.statused:
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raise StopIteration()
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else:
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self._call.start_server_batch(
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(cygrpc.ReceiveMessageOperation(_EMPTY_FLAGS),),
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_receive_message(self._state, self._call,
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self._request_deserializer))
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self._state.due.add(_RECEIVE_MESSAGE_TOKEN)
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def _look_for_request(self):
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if self._state.client is _CANCELLED:
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_raise_rpc_error(self._state)
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elif (self._state.request is None and
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_RECEIVE_MESSAGE_TOKEN not in self._state.due):
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raise StopIteration()
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else:
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request = self._state.request
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self._state.request = None
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return request
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raise AssertionError() # should never run
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def _next(self):
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with self._state.condition:
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self._raise_or_start_receive_message()
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while True:
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self._state.condition.wait()
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request = self._look_for_request()
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if request is not None:
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return request
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def __iter__(self):
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return self
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def __next__(self):
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return self._next()
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def next(self):
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return self._next()
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def _unary_request(rpc_event, state, request_deserializer):
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def unary_request():
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with state.condition:
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if state.client is _CANCELLED or state.statused:
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return None
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else:
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rpc_event.call.start_server_batch(
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(cygrpc.ReceiveMessageOperation(_EMPTY_FLAGS),),
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_receive_message(state, rpc_event.call,
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request_deserializer))
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state.due.add(_RECEIVE_MESSAGE_TOKEN)
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while True:
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state.condition.wait()
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if state.request is None:
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if state.client is _CLOSED:
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details = '"{}" requires exactly one request message.'.format(
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rpc_event.call_details.method)
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_abort(state, rpc_event.call,
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cygrpc.StatusCode.unimplemented,
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_common.encode(details))
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return None
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elif state.client is _CANCELLED:
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return None
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else:
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request = state.request
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state.request = None
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return request
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return unary_request
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def _call_behavior(rpc_event, state, behavior, argument, request_deserializer):
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||
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context = _Context(rpc_event, state, request_deserializer)
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|
|
try:
|
||
|
|
return behavior(argument, context), True
|
||
|
|
except Exception as exception: # pylint: disable=broad-except
|
||
|
|
with state.condition:
|
||
|
|
if exception is state.abortion:
|
||
|
|
_abort(state, rpc_event.call, cygrpc.StatusCode.unknown,
|
||
|
|
b'RPC Aborted')
|
||
|
|
elif exception not in state.rpc_errors:
|
||
|
|
details = 'Exception calling application: {}'.format(exception)
|
||
|
|
_LOGGER.exception(details)
|
||
|
|
_abort(state, rpc_event.call, cygrpc.StatusCode.unknown,
|
||
|
|
_common.encode(details))
|
||
|
|
return None, False
|
||
|
|
|
||
|
|
|
||
|
|
def _take_response_from_response_iterator(rpc_event, state, response_iterator):
|
||
|
|
try:
|
||
|
|
return next(response_iterator), True
|
||
|
|
except StopIteration:
|
||
|
|
return None, True
|
||
|
|
except Exception as exception: # pylint: disable=broad-except
|
||
|
|
with state.condition:
|
||
|
|
if exception is state.abortion:
|
||
|
|
_abort(state, rpc_event.call, cygrpc.StatusCode.unknown,
|
||
|
|
b'RPC Aborted')
|
||
|
|
elif exception not in state.rpc_errors:
|
||
|
|
details = 'Exception iterating responses: {}'.format(exception)
|
||
|
|
_LOGGER.exception(details)
|
||
|
|
_abort(state, rpc_event.call, cygrpc.StatusCode.unknown,
|
||
|
|
_common.encode(details))
|
||
|
|
return None, False
|
||
|
|
|
||
|
|
|
||
|
|
def _serialize_response(rpc_event, state, response, response_serializer):
|
||
|
|
serialized_response = _common.serialize(response, response_serializer)
|
||
|
|
if serialized_response is None:
|
||
|
|
with state.condition:
|
||
|
|
_abort(state, rpc_event.call, cygrpc.StatusCode.internal,
|
||
|
|
b'Failed to serialize response!')
|
||
|
|
return None
|
||
|
|
else:
|
||
|
|
return serialized_response
|
||
|
|
|
||
|
|
|
||
|
|
def _send_response(rpc_event, state, serialized_response):
|
||
|
|
with state.condition:
|
||
|
|
if state.client is _CANCELLED or state.statused:
|
||
|
|
return False
|
||
|
|
else:
|
||
|
|
if state.initial_metadata_allowed:
|
||
|
|
operations = (
|
||
|
|
cygrpc.SendInitialMetadataOperation(None, _EMPTY_FLAGS),
|
||
|
|
cygrpc.SendMessageOperation(serialized_response,
|
||
|
|
_EMPTY_FLAGS),
|
||
|
|
)
|
||
|
|
state.initial_metadata_allowed = False
|
||
|
|
token = _SEND_INITIAL_METADATA_AND_SEND_MESSAGE_TOKEN
|
||
|
|
else:
|
||
|
|
operations = (cygrpc.SendMessageOperation(
|
||
|
|
serialized_response, _EMPTY_FLAGS),)
|
||
|
|
token = _SEND_MESSAGE_TOKEN
|
||
|
|
rpc_event.call.start_server_batch(operations,
|
||
|
|
_send_message(state, token))
|
||
|
|
state.due.add(token)
|
||
|
|
while True:
|
||
|
|
state.condition.wait()
|
||
|
|
if token not in state.due:
|
||
|
|
return state.client is not _CANCELLED and not state.statused
|
||
|
|
|
||
|
|
|
||
|
|
def _status(rpc_event, state, serialized_response):
|
||
|
|
with state.condition:
|
||
|
|
if state.client is not _CANCELLED:
|
||
|
|
code = _completion_code(state)
|
||
|
|
details = _details(state)
|
||
|
|
operations = [
|
||
|
|
cygrpc.SendStatusFromServerOperation(
|
||
|
|
state.trailing_metadata, code, details, _EMPTY_FLAGS),
|
||
|
|
]
|
||
|
|
if state.initial_metadata_allowed:
|
||
|
|
operations.append(
|
||
|
|
cygrpc.SendInitialMetadataOperation(None, _EMPTY_FLAGS))
|
||
|
|
if serialized_response is not None:
|
||
|
|
operations.append(
|
||
|
|
cygrpc.SendMessageOperation(serialized_response,
|
||
|
|
_EMPTY_FLAGS))
|
||
|
|
rpc_event.call.start_server_batch(
|
||
|
|
operations,
|
||
|
|
_send_status_from_server(state, _SEND_STATUS_FROM_SERVER_TOKEN))
|
||
|
|
state.statused = True
|
||
|
|
state.due.add(_SEND_STATUS_FROM_SERVER_TOKEN)
|
||
|
|
|
||
|
|
|
||
|
|
def _unary_response_in_pool(rpc_event, state, behavior, argument_thunk,
|
||
|
|
request_deserializer, response_serializer):
|
||
|
|
argument = argument_thunk()
|
||
|
|
if argument is not None:
|
||
|
|
response, proceed = _call_behavior(rpc_event, state, behavior, argument,
|
||
|
|
request_deserializer)
|
||
|
|
if proceed:
|
||
|
|
serialized_response = _serialize_response(
|
||
|
|
rpc_event, state, response, response_serializer)
|
||
|
|
if serialized_response is not None:
|
||
|
|
_status(rpc_event, state, serialized_response)
|
||
|
|
|
||
|
|
|
||
|
|
def _stream_response_in_pool(rpc_event, state, behavior, argument_thunk,
|
||
|
|
request_deserializer, response_serializer):
|
||
|
|
argument = argument_thunk()
|
||
|
|
if argument is not None:
|
||
|
|
response_iterator, proceed = _call_behavior(
|
||
|
|
rpc_event, state, behavior, argument, request_deserializer)
|
||
|
|
if proceed:
|
||
|
|
while True:
|
||
|
|
response, proceed = _take_response_from_response_iterator(
|
||
|
|
rpc_event, state, response_iterator)
|
||
|
|
if proceed:
|
||
|
|
if response is None:
|
||
|
|
_status(rpc_event, state, None)
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
serialized_response = _serialize_response(
|
||
|
|
rpc_event, state, response, response_serializer)
|
||
|
|
if serialized_response is not None:
|
||
|
|
proceed = _send_response(rpc_event, state,
|
||
|
|
serialized_response)
|
||
|
|
if not proceed:
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
|
||
|
|
|
||
|
|
def _handle_unary_unary(rpc_event, state, method_handler, thread_pool):
|
||
|
|
unary_request = _unary_request(rpc_event, state,
|
||
|
|
method_handler.request_deserializer)
|
||
|
|
return thread_pool.submit(_unary_response_in_pool, rpc_event, state,
|
||
|
|
method_handler.unary_unary, unary_request,
|
||
|
|
method_handler.request_deserializer,
|
||
|
|
method_handler.response_serializer)
|
||
|
|
|
||
|
|
|
||
|
|
def _handle_unary_stream(rpc_event, state, method_handler, thread_pool):
|
||
|
|
unary_request = _unary_request(rpc_event, state,
|
||
|
|
method_handler.request_deserializer)
|
||
|
|
return thread_pool.submit(_stream_response_in_pool, rpc_event, state,
|
||
|
|
method_handler.unary_stream, unary_request,
|
||
|
|
method_handler.request_deserializer,
|
||
|
|
method_handler.response_serializer)
|
||
|
|
|
||
|
|
|
||
|
|
def _handle_stream_unary(rpc_event, state, method_handler, thread_pool):
|
||
|
|
request_iterator = _RequestIterator(state, rpc_event.call,
|
||
|
|
method_handler.request_deserializer)
|
||
|
|
return thread_pool.submit(
|
||
|
|
_unary_response_in_pool, rpc_event, state, method_handler.stream_unary,
|
||
|
|
lambda: request_iterator, method_handler.request_deserializer,
|
||
|
|
method_handler.response_serializer)
|
||
|
|
|
||
|
|
|
||
|
|
def _handle_stream_stream(rpc_event, state, method_handler, thread_pool):
|
||
|
|
request_iterator = _RequestIterator(state, rpc_event.call,
|
||
|
|
method_handler.request_deserializer)
|
||
|
|
return thread_pool.submit(
|
||
|
|
_stream_response_in_pool, rpc_event, state,
|
||
|
|
method_handler.stream_stream, lambda: request_iterator,
|
||
|
|
method_handler.request_deserializer, method_handler.response_serializer)
|
||
|
|
|
||
|
|
|
||
|
|
def _find_method_handler(rpc_event, generic_handlers, interceptor_pipeline):
|
||
|
|
|
||
|
|
def query_handlers(handler_call_details):
|
||
|
|
for generic_handler in generic_handlers:
|
||
|
|
method_handler = generic_handler.service(handler_call_details)
|
||
|
|
if method_handler is not None:
|
||
|
|
return method_handler
|
||
|
|
return None
|
||
|
|
|
||
|
|
handler_call_details = _HandlerCallDetails(
|
||
|
|
_common.decode(rpc_event.call_details.method),
|
||
|
|
rpc_event.invocation_metadata)
|
||
|
|
|
||
|
|
if interceptor_pipeline is not None:
|
||
|
|
return interceptor_pipeline.execute(query_handlers,
|
||
|
|
handler_call_details)
|
||
|
|
else:
|
||
|
|
return query_handlers(handler_call_details)
|
||
|
|
|
||
|
|
|
||
|
|
def _reject_rpc(rpc_event, status, details):
|
||
|
|
operations = (
|
||
|
|
cygrpc.SendInitialMetadataOperation(None, _EMPTY_FLAGS),
|
||
|
|
cygrpc.ReceiveCloseOnServerOperation(_EMPTY_FLAGS),
|
||
|
|
cygrpc.SendStatusFromServerOperation(None, status, details,
|
||
|
|
_EMPTY_FLAGS),
|
||
|
|
)
|
||
|
|
rpc_state = _RPCState()
|
||
|
|
rpc_event.call.start_server_batch(operations,
|
||
|
|
lambda ignored_event: (rpc_state, (),))
|
||
|
|
return rpc_state
|
||
|
|
|
||
|
|
|
||
|
|
def _handle_with_method_handler(rpc_event, method_handler, thread_pool):
|
||
|
|
state = _RPCState()
|
||
|
|
with state.condition:
|
||
|
|
rpc_event.call.start_server_batch(
|
||
|
|
(cygrpc.ReceiveCloseOnServerOperation(_EMPTY_FLAGS),),
|
||
|
|
_receive_close_on_server(state))
|
||
|
|
state.due.add(_RECEIVE_CLOSE_ON_SERVER_TOKEN)
|
||
|
|
if method_handler.request_streaming:
|
||
|
|
if method_handler.response_streaming:
|
||
|
|
return state, _handle_stream_stream(rpc_event, state,
|
||
|
|
method_handler, thread_pool)
|
||
|
|
else:
|
||
|
|
return state, _handle_stream_unary(rpc_event, state,
|
||
|
|
method_handler, thread_pool)
|
||
|
|
else:
|
||
|
|
if method_handler.response_streaming:
|
||
|
|
return state, _handle_unary_stream(rpc_event, state,
|
||
|
|
method_handler, thread_pool)
|
||
|
|
else:
|
||
|
|
return state, _handle_unary_unary(rpc_event, state,
|
||
|
|
method_handler, thread_pool)
|
||
|
|
|
||
|
|
|
||
|
|
def _handle_call(rpc_event, generic_handlers, interceptor_pipeline, thread_pool,
|
||
|
|
concurrency_exceeded):
|
||
|
|
if not rpc_event.success:
|
||
|
|
return None, None
|
||
|
|
if rpc_event.call_details.method is not None:
|
||
|
|
try:
|
||
|
|
method_handler = _find_method_handler(rpc_event, generic_handlers,
|
||
|
|
interceptor_pipeline)
|
||
|
|
except Exception as exception: # pylint: disable=broad-except
|
||
|
|
details = 'Exception servicing handler: {}'.format(exception)
|
||
|
|
_LOGGER.exception(details)
|
||
|
|
return _reject_rpc(rpc_event, cygrpc.StatusCode.unknown,
|
||
|
|
b'Error in service handler!'), None
|
||
|
|
if method_handler is None:
|
||
|
|
return _reject_rpc(rpc_event, cygrpc.StatusCode.unimplemented,
|
||
|
|
b'Method not found!'), None
|
||
|
|
elif concurrency_exceeded:
|
||
|
|
return _reject_rpc(rpc_event, cygrpc.StatusCode.resource_exhausted,
|
||
|
|
b'Concurrent RPC limit exceeded!'), None
|
||
|
|
else:
|
||
|
|
return _handle_with_method_handler(rpc_event, method_handler,
|
||
|
|
thread_pool)
|
||
|
|
else:
|
||
|
|
return None, None
|
||
|
|
|
||
|
|
|
||
|
|
@enum.unique
|
||
|
|
class _ServerStage(enum.Enum):
|
||
|
|
STOPPED = 'stopped'
|
||
|
|
STARTED = 'started'
|
||
|
|
GRACE = 'grace'
|
||
|
|
|
||
|
|
|
||
|
|
class _ServerState(object):
|
||
|
|
|
||
|
|
# pylint: disable=too-many-arguments
|
||
|
|
def __init__(self, completion_queue, server, generic_handlers,
|
||
|
|
interceptor_pipeline, thread_pool, maximum_concurrent_rpcs):
|
||
|
|
self.lock = threading.RLock()
|
||
|
|
self.completion_queue = completion_queue
|
||
|
|
self.server = server
|
||
|
|
self.generic_handlers = list(generic_handlers)
|
||
|
|
self.interceptor_pipeline = interceptor_pipeline
|
||
|
|
self.thread_pool = thread_pool
|
||
|
|
self.stage = _ServerStage.STOPPED
|
||
|
|
self.shutdown_events = None
|
||
|
|
self.maximum_concurrent_rpcs = maximum_concurrent_rpcs
|
||
|
|
self.active_rpc_count = 0
|
||
|
|
|
||
|
|
# TODO(https://github.com/grpc/grpc/issues/6597): eliminate these fields.
|
||
|
|
self.rpc_states = set()
|
||
|
|
self.due = set()
|
||
|
|
|
||
|
|
|
||
|
|
def _add_generic_handlers(state, generic_handlers):
|
||
|
|
with state.lock:
|
||
|
|
state.generic_handlers.extend(generic_handlers)
|
||
|
|
|
||
|
|
|
||
|
|
def _add_insecure_port(state, address):
|
||
|
|
with state.lock:
|
||
|
|
return state.server.add_http2_port(address)
|
||
|
|
|
||
|
|
|
||
|
|
def _add_secure_port(state, address, server_credentials):
|
||
|
|
with state.lock:
|
||
|
|
return state.server.add_http2_port(address,
|
||
|
|
server_credentials._credentials)
|
||
|
|
|
||
|
|
|
||
|
|
def _request_call(state):
|
||
|
|
state.server.request_call(state.completion_queue, state.completion_queue,
|
||
|
|
_REQUEST_CALL_TAG)
|
||
|
|
state.due.add(_REQUEST_CALL_TAG)
|
||
|
|
|
||
|
|
|
||
|
|
# TODO(https://github.com/grpc/grpc/issues/6597): delete this function.
|
||
|
|
def _stop_serving(state):
|
||
|
|
if not state.rpc_states and not state.due:
|
||
|
|
for shutdown_event in state.shutdown_events:
|
||
|
|
shutdown_event.set()
|
||
|
|
state.stage = _ServerStage.STOPPED
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
def _on_call_completed(state):
|
||
|
|
with state.lock:
|
||
|
|
state.active_rpc_count -= 1
|
||
|
|
|
||
|
|
|
||
|
|
def _serve(state):
|
||
|
|
while True:
|
||
|
|
event = state.completion_queue.poll()
|
||
|
|
if event.tag is _SHUTDOWN_TAG:
|
||
|
|
with state.lock:
|
||
|
|
state.due.remove(_SHUTDOWN_TAG)
|
||
|
|
if _stop_serving(state):
|
||
|
|
return
|
||
|
|
elif event.tag is _REQUEST_CALL_TAG:
|
||
|
|
with state.lock:
|
||
|
|
state.due.remove(_REQUEST_CALL_TAG)
|
||
|
|
concurrency_exceeded = (
|
||
|
|
state.maximum_concurrent_rpcs is not None and
|
||
|
|
state.active_rpc_count >= state.maximum_concurrent_rpcs)
|
||
|
|
rpc_state, rpc_future = _handle_call(
|
||
|
|
event, state.generic_handlers, state.interceptor_pipeline,
|
||
|
|
state.thread_pool, concurrency_exceeded)
|
||
|
|
if rpc_state is not None:
|
||
|
|
state.rpc_states.add(rpc_state)
|
||
|
|
if rpc_future is not None:
|
||
|
|
state.active_rpc_count += 1
|
||
|
|
rpc_future.add_done_callback(
|
||
|
|
lambda unused_future: _on_call_completed(state))
|
||
|
|
if state.stage is _ServerStage.STARTED:
|
||
|
|
_request_call(state)
|
||
|
|
elif _stop_serving(state):
|
||
|
|
return
|
||
|
|
else:
|
||
|
|
rpc_state, callbacks = event.tag(event)
|
||
|
|
for callback in callbacks:
|
||
|
|
callable_util.call_logging_exceptions(
|
||
|
|
callback, 'Exception calling callback!')
|
||
|
|
if rpc_state is not None:
|
||
|
|
with state.lock:
|
||
|
|
state.rpc_states.remove(rpc_state)
|
||
|
|
if _stop_serving(state):
|
||
|
|
return
|
||
|
|
# We want to force the deletion of the previous event
|
||
|
|
# ~before~ we poll again; if the event has a reference
|
||
|
|
# to a shutdown Call object, this can induce spinlock.
|
||
|
|
event = None
|
||
|
|
|
||
|
|
|
||
|
|
def _stop(state, grace):
|
||
|
|
with state.lock:
|
||
|
|
if state.stage is _ServerStage.STOPPED:
|
||
|
|
shutdown_event = threading.Event()
|
||
|
|
shutdown_event.set()
|
||
|
|
return shutdown_event
|
||
|
|
else:
|
||
|
|
if state.stage is _ServerStage.STARTED:
|
||
|
|
state.server.shutdown(state.completion_queue, _SHUTDOWN_TAG)
|
||
|
|
state.stage = _ServerStage.GRACE
|
||
|
|
state.shutdown_events = []
|
||
|
|
state.due.add(_SHUTDOWN_TAG)
|
||
|
|
shutdown_event = threading.Event()
|
||
|
|
state.shutdown_events.append(shutdown_event)
|
||
|
|
if grace is None:
|
||
|
|
state.server.cancel_all_calls()
|
||
|
|
else:
|
||
|
|
|
||
|
|
def cancel_all_calls_after_grace():
|
||
|
|
shutdown_event.wait(timeout=grace)
|
||
|
|
with state.lock:
|
||
|
|
state.server.cancel_all_calls()
|
||
|
|
|
||
|
|
thread = threading.Thread(target=cancel_all_calls_after_grace)
|
||
|
|
thread.start()
|
||
|
|
return shutdown_event
|
||
|
|
shutdown_event.wait()
|
||
|
|
return shutdown_event
|
||
|
|
|
||
|
|
|
||
|
|
def _start(state):
|
||
|
|
with state.lock:
|
||
|
|
if state.stage is not _ServerStage.STOPPED:
|
||
|
|
raise ValueError('Cannot start already-started server!')
|
||
|
|
state.server.start()
|
||
|
|
state.stage = _ServerStage.STARTED
|
||
|
|
_request_call(state)
|
||
|
|
|
||
|
|
thread = threading.Thread(target=_serve, args=(state,))
|
||
|
|
thread.daemon = True
|
||
|
|
thread.start()
|
||
|
|
|
||
|
|
|
||
|
|
def _validate_generic_rpc_handlers(generic_rpc_handlers):
|
||
|
|
for generic_rpc_handler in generic_rpc_handlers:
|
||
|
|
service_attribute = getattr(generic_rpc_handler, 'service', None)
|
||
|
|
if service_attribute is None:
|
||
|
|
raise AttributeError(
|
||
|
|
'"{}" must conform to grpc.GenericRpcHandler type but does '
|
||
|
|
'not have "service" method!'.format(generic_rpc_handler))
|
||
|
|
|
||
|
|
|
||
|
|
class _Server(grpc.Server):
|
||
|
|
|
||
|
|
# pylint: disable=too-many-arguments
|
||
|
|
def __init__(self, thread_pool, generic_handlers, interceptors, options,
|
||
|
|
maximum_concurrent_rpcs):
|
||
|
|
completion_queue = cygrpc.CompletionQueue()
|
||
|
|
server = cygrpc.Server(options)
|
||
|
|
server.register_completion_queue(completion_queue)
|
||
|
|
self._state = _ServerState(completion_queue, server, generic_handlers,
|
||
|
|
_interceptor.service_pipeline(interceptors),
|
||
|
|
thread_pool, maximum_concurrent_rpcs)
|
||
|
|
|
||
|
|
def add_generic_rpc_handlers(self, generic_rpc_handlers):
|
||
|
|
_validate_generic_rpc_handlers(generic_rpc_handlers)
|
||
|
|
_add_generic_handlers(self._state, generic_rpc_handlers)
|
||
|
|
|
||
|
|
def add_insecure_port(self, address):
|
||
|
|
return _add_insecure_port(self._state, _common.encode(address))
|
||
|
|
|
||
|
|
def add_secure_port(self, address, server_credentials):
|
||
|
|
return _add_secure_port(self._state, _common.encode(address),
|
||
|
|
server_credentials)
|
||
|
|
|
||
|
|
def start(self):
|
||
|
|
_start(self._state)
|
||
|
|
|
||
|
|
def stop(self, grace):
|
||
|
|
return _stop(self._state, grace)
|
||
|
|
|
||
|
|
def __del__(self):
|
||
|
|
_stop(self._state, None)
|
||
|
|
|
||
|
|
|
||
|
|
def create_server(thread_pool, generic_rpc_handlers, interceptors, options,
|
||
|
|
maximum_concurrent_rpcs):
|
||
|
|
_validate_generic_rpc_handlers(generic_rpc_handlers)
|
||
|
|
return _Server(thread_pool, generic_rpc_handlers, interceptors, options,
|
||
|
|
maximum_concurrent_rpcs)
|