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Merge pull request #226 from gnes-ai/refactor-grpc-client
feat(grpc-client): add multi-threaded sync grpc client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| # Tencent is pleased to support the open source community by making GNES available. | ||
| # | ||
| # Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved. | ||
| # 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. | ||
|
|
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| import grpc | ||
| import queue | ||
| from concurrent import futures | ||
|
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| from gnes.proto import gnes_pb2_grpc | ||
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| class BaseClient: | ||
|
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| def __init__(self, args): | ||
| self.args = args | ||
|
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| self._channel = grpc.insecure_channel( | ||
| '%s:%d' % (self.args.grpc_host, self.args.grpc_port), | ||
| options={ | ||
| "grpc.max_send_message_length": -1, | ||
| "grpc.max_receive_message_length": -1, | ||
| }.items(), | ||
| ) | ||
|
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| def call(self, request): | ||
| resp = self._stub.Call(request) | ||
| return resp | ||
|
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| def async_call(self, request, callback_fn=None): | ||
| response_future = self._stub.Call.future(self._request) | ||
| if callback_fn: | ||
| response_future.add_done_callback(callback_fn) | ||
| else: | ||
| return response_future | ||
|
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| def send_request(self, request): | ||
| """Non-blocking wrapper for a client's request operation.""" | ||
| raise NotImplementedError | ||
|
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| def start(self): | ||
| # waits for the channel to be ready before we start sending messages | ||
| grpc.channel_ready_future(self._channel).result() | ||
| self._stub = gnes_pb2_grpc.GnesRPCStub(self._channel) | ||
|
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| def stop(self): | ||
| self._channel.close() | ||
| self._stub = None | ||
|
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| def __enter__(self): | ||
| self.start() | ||
| return self | ||
|
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| def __exit__(self, exc_type, exc_val, exc_tb): | ||
| self.close() | ||
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| class UnarySyncClient(BaseClient): | ||
|
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| def __init__(self, args): | ||
| super().__init__(args) | ||
| self._pool = futures.ThreadPoolExecutor( | ||
| max_workers=self.args.max_concurrency) | ||
| self.request_cnt = 0 | ||
| self._response_callbacks = [] | ||
|
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| def send_request(self, request): | ||
| # Send requests in seperate threads to support multiple outstanding rpcs | ||
| self._pool.submit(self._dispatch_request, request) | ||
|
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| def stop(self): | ||
| self._pool.shutdown(wait=True) | ||
| super().stop() | ||
|
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| def _dispatch_request(self, request): | ||
| resp = self._stub.Call(request) | ||
| self._handle_response(self, resp) | ||
|
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| def _handle_response(self, client, response): | ||
| for callback in self._response_callbacks: | ||
| callback(client, response) | ||
|
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| def add_response_callback(self, callback): | ||
| """callback will be invoked as callback(client, response)""" | ||
| self._response_callbacks.append(callback) | ||
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| class _SyncStream(object): | ||
|
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| def __init__(self, stub, handle_response): | ||
| self._stub = stub | ||
| self._handle_response = handle_response | ||
| self._is_streaming = False | ||
| self._request_queue = queue.Queue() | ||
|
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| def send_request(self, request): | ||
| self._request_queue.put(request) | ||
|
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| def start(self): | ||
| self._is_streaming = True | ||
| response_stream = self._stub.StreamCall(self._request_generator()) | ||
| for resp in response_stream: | ||
| self._handle_response(self, resp) | ||
|
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| def stop(self): | ||
| self._is_streaming = False | ||
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| def _request_generator(self): | ||
| while self._is_streaming: | ||
| try: | ||
| request = self._request_queue.get(block=True, timeout=1.0) | ||
| yield request | ||
| except queue.Empty: | ||
| pass | ||
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| class StreamingClient(UnarySyncClient): | ||
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| def __init__(self, args): | ||
| super().__init__(args) | ||
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| self._streams = [ | ||
| _SyncStream(self._stub, self._handle_response) | ||
| for _ in range(self.args.max_concurrency) | ||
| ] | ||
| self._curr_stream = 0 | ||
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| def send_request(self, request): | ||
| # Use a round_robin scheduler to determine what stream to send on | ||
| self._streams[self._curr_stream].send_request(request) | ||
| self._curr_stream = (self._curr_stream + 1) % len(self._streams) | ||
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| def start(self): | ||
| super().start() | ||
| for stream in self._streams: | ||
| self._pool.submit(stream.start) | ||
|
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| def stop(self): | ||
| for stream in self._streams: | ||
| stream.stop() | ||
| super().stop() |
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