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