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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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92 lines
3.2 KiB
92 lines
3.2 KiB
# Copyright 2020 The 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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from concurrent.futures import ThreadPoolExecutor |
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import logging |
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import threading |
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import time |
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from typing import Iterable |
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from google.protobuf.json_format import MessageToJson |
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import grpc |
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import phone_pb2 |
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import phone_pb2_grpc |
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def create_state_response( |
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call_state: phone_pb2.CallState.State) -> phone_pb2.StreamCallResponse: |
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response = phone_pb2.StreamCallResponse() |
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response.call_state.state = call_state |
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return response |
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class Phone(phone_pb2_grpc.PhoneServicer): |
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def __init__(self): |
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self._id_counter = 0 |
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self._lock = threading.RLock() |
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def _create_call_session(self) -> phone_pb2.CallInfo: |
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call_info = phone_pb2.CallInfo() |
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with self._lock: |
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call_info.session_id = str(self._id_counter) |
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self._id_counter += 1 |
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call_info.media = "https://link.to.audio.resources" |
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logging.info("Created a call session [%s]", MessageToJson(call_info)) |
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return call_info |
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def _clean_call_session(self, call_info: phone_pb2.CallInfo) -> None: |
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logging.info("Call session cleaned [%s]", MessageToJson(call_info)) |
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def StreamCall( |
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self, request_iterator: Iterable[phone_pb2.StreamCallRequest], |
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context: grpc.ServicerContext |
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) -> Iterable[phone_pb2.StreamCallResponse]: |
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try: |
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request = next(request_iterator) |
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logging.info("Received a phone call request for number [%s]", |
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request.phone_number) |
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except StopIteration: |
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raise RuntimeError("Failed to receive call request") |
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# Simulate the acceptance of call request |
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time.sleep(1) |
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yield create_state_response(phone_pb2.CallState.NEW) |
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# Simulate the start of the call session |
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time.sleep(1) |
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call_info = self._create_call_session() |
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context.add_callback(lambda: self._clean_call_session(call_info)) |
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response = phone_pb2.StreamCallResponse() |
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response.call_info.session_id = call_info.session_id |
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response.call_info.media = call_info.media |
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yield response |
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yield create_state_response(phone_pb2.CallState.ACTIVE) |
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# Simulate the end of the call |
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time.sleep(2) |
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yield create_state_response(phone_pb2.CallState.ENDED) |
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logging.info("Call finished [%s]", request.phone_number) |
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def serve(address: str) -> None: |
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server = grpc.server(ThreadPoolExecutor()) |
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phone_pb2_grpc.add_PhoneServicer_to_server(Phone(), server) |
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server.add_insecure_port(address) |
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server.start() |
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logging.info("Server serving at %s", address) |
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server.wait_for_termination() |
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if __name__ == "__main__": |
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logging.basicConfig(level=logging.INFO) |
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serve("[::]:50051")
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