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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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94 lines
3.3 KiB
94 lines
3.3 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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"""The Python implementation of the GRPC helloworld.Greeter server.""" |
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from concurrent import futures |
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import argparse |
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import logging |
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import multiprocessing |
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import socket |
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import grpc |
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import helloworld_pb2 |
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import helloworld_pb2_grpc |
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from grpc_reflection.v1alpha import reflection |
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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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_DESCRIPTION = "A general purpose phony server." |
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class Greeter(helloworld_pb2_grpc.GreeterServicer): |
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def __init__(self, hostname: str): |
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self._hostname = hostname if hostname else socket.gethostname() |
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def SayHello(self, request: helloworld_pb2.HelloRequest, |
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context: grpc.ServicerContext) -> helloworld_pb2.HelloReply: |
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return helloworld_pb2.HelloReply( |
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message=f"Hello {request.name} from {self._hostname}!") |
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def serve(port: int, hostname: str): |
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server = grpc.server( |
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futures.ThreadPoolExecutor(max_workers=multiprocessing.cpu_count())) |
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# Add the application servicer to the server. |
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helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(hostname), server) |
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# Create a health check servicer. We use the non-blocking implementation |
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# to avoid thread starvation. |
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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=1)) |
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health_pb2_grpc.add_HealthServicer_to_server(health_servicer, server) |
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# Create a tuple of all of the services we want to export via reflection. |
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services = tuple( |
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service.full_name |
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for service in helloworld_pb2.DESCRIPTOR.services_by_name.values()) + ( |
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reflection.SERVICE_NAME, health.SERVICE_NAME) |
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# Add the reflection service to the server. |
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reflection.enable_server_reflection(services, server) |
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server.add_insecure_port(f"[::]:{port}") |
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server.start() |
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# Mark all services as healthy. |
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overall_server_health = "" |
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for service in services + (overall_server_health,): |
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health_servicer.set(service, health_pb2.HealthCheckResponse.SERVING) |
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# Park the main application thread. |
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server.wait_for_termination() |
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if __name__ == '__main__': |
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parser = argparse.ArgumentParser(description=_DESCRIPTION) |
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parser.add_argument("port", |
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default=50051, |
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type=int, |
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nargs="?", |
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help="The port on which to listen.") |
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parser.add_argument("hostname", |
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type=str, |
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default=None, |
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nargs="?", |
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help="The name clients will see in responses.") |
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args = parser.parse_args() |
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logging.basicConfig() |
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serve(args.port, args.hostname)
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