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75 lines
2.4 KiB
75 lines
2.4 KiB
# 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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) |
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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( |
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target=_toggle_health, |
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args=(health_servicer, "helloworld.Greeter"), |
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daemon=True, |
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) |
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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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