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Diffstat (limited to 'examples/python/helloworld/async_greeter_server_with_graceful_shutdown.py')
-rw-r--r-- | examples/python/helloworld/async_greeter_server_with_graceful_shutdown.py | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/examples/python/helloworld/async_greeter_server_with_graceful_shutdown.py b/examples/python/helloworld/async_greeter_server_with_graceful_shutdown.py new file mode 100644 index 0000000000..ebc03f8d9a --- /dev/null +++ b/examples/python/helloworld/async_greeter_server_with_graceful_shutdown.py @@ -0,0 +1,64 @@ +# Copyright 2021 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. +"""The graceful shutdown example for the asyncio Greeter server.""" + +import asyncio +import logging + +import grpc +import helloworld_pb2 +import helloworld_pb2_grpc + +# Coroutines to be invoked when the event loop is shutting down. +_cleanup_coroutines = [] + + +class Greeter(helloworld_pb2_grpc.GreeterServicer): + + async def SayHello( + self, request: helloworld_pb2.HelloRequest, + context: grpc.aio.ServicerContext) -> helloworld_pb2.HelloReply: + logging.info('Received request, sleeping for 4 seconds...') + await asyncio.sleep(4) + logging.info('Sleep completed, responding') + return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name) + + +async def serve() -> None: + server = grpc.aio.server() + helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server) + listen_addr = '[::]:50051' + server.add_insecure_port(listen_addr) + logging.info("Starting server on %s", listen_addr) + await server.start() + + async def server_graceful_shutdown(): + logging.info("Starting graceful shutdown...") + # Shuts down the server with 0 seconds of grace period. During the + # grace period, the server won't accept new connections and allow + # existing RPCs to continue within the grace period. + await server.stop(5) + + _cleanup_coroutines.append(server_graceful_shutdown()) + await server.wait_for_termination() + + +if __name__ == '__main__': + logging.basicConfig(level=logging.INFO) + loop = asyncio.get_event_loop() + try: + loop.run_until_complete(serve()) + finally: + loop.run_until_complete(*_cleanup_coroutines) + loop.close() |