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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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75 lines
2.6 KiB
75 lines
2.6 KiB
2 years ago
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# Copyright 2023 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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"""The Python implementation of the GRPC helloworld.Greeter server with health checking."""
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from concurrent import futures
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import logging
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import threading
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from time import sleep
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import grpc
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from grpc_health.v1 import health
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from grpc_health.v1 import health_pb2
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from grpc_health.v1 import health_pb2_grpc
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import helloworld_pb2
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import helloworld_pb2_grpc
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class Greeter(helloworld_pb2_grpc.GreeterServicer):
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def SayHello(self, request, context):
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return helloworld_pb2.HelloReply(message=request.name)
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def _toggle_health(health_servicer: health.HealthServicer, service: str):
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next_status = health_pb2.HealthCheckResponse.SERVING
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while True:
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if next_status == health_pb2.HealthCheckResponse.SERVING:
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next_status = health_pb2.HealthCheckResponse.NOT_SERVING
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else:
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next_status = health_pb2.HealthCheckResponse.SERVING
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health_servicer.set(service, next_status)
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sleep(5)
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def _configure_health_server(server: grpc.Server):
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health_servicer = health.HealthServicer(
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experimental_non_blocking=True,
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experimental_thread_pool=futures.ThreadPoolExecutor(max_workers=10))
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health_pb2_grpc.add_HealthServicer_to_server(health_servicer, server)
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# Use a daemon thread to toggle health status
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toggle_health_status_thread = threading.Thread(target=_toggle_health,
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args=(health_servicer,
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"helloworld.Greeter"),
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daemon=True)
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toggle_health_status_thread.start()
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def serve():
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port = '50051'
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server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
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helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
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server.add_insecure_port('[::]:' + port)
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_configure_health_server(server)
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server.start()
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print("Server started, listening on " + port)
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server.wait_for_termination()
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if __name__ == '__main__':
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logging.basicConfig()
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serve()
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