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message Person {
    int32 id = 1;
    string name = 2;
    string email  =3;
}

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python -m pip install grpcio
python -m pip install grpcio-tools

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git clone -b v1.64.0 --depth 1 --shallow-submodules https://github.com/grpc/grpc
cd grpc/examples/python/helloworld

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python greeter_server.py

# 出力
Server started, listening on 50051

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python greeter_client.py

## レスポンス
Will try to greet world ...
Greeter client received: Hello, you!

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cd grpc/examples/protos

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syntax = "proto3";

option java_multiple_files = true;
option java_package = "io.grpc.examples.helloworld";
option java_outer_classname = "HelloWorldProto";
option objc_class_prefix = "HLW";

package helloworld;

// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply) {}

  // 以下の1行を追加
  rpc SayHelloAgain (HelloRequest) returns (HelloReply) {}

  rpc SayHelloStreamReply (HelloRequest) returns (stream HelloReply) {}

  rpc SayHelloBidiStream (stream HelloRequest) returns (stream HelloReply) {}
}

// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}

// The response message containing the greetings
message HelloReply {
  string message = 1;
}

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cd examples/python/helloworld

python -m grpc_tools.protoc -I../../protos --python_out=. --pyi_out=. --grpc_python_out=. ../../protos/helloworld.proto

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ls -l

-rw-r--r--@ 1 xx  xx  1823  9  1 18:12 helloworld_pb2.py
-rw-r--r--@ 1 xx  xx  578  9  1 18:12 helloworld_pb2.pyi
-rw-r--r--@ 1 xx  xx  7018  9  1 18:12 helloworld_pb2_grpc.py

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from concurrent import futures
import logging

import grpc
import helloworld_pb2
import helloworld_pb2_grpc


class Greeter(helloworld_pb2_grpc.GreeterServicer):
    def SayHello(self, request, context):
        return helloworld_pb2.HelloReply(message="Hello, %s!" % request.name)
    # 以下の関数を追加
    def SayHelloAgain(self, request, context):
        return helloworld_pb2.HelloReply(message="Hello Again, %s!" % request.name)

def serve():
    port = "50051"
    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
    helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
    server.add_insecure_port("[::]:" + port)
    server.start()
    print("Server started, listening on " + port)
    server.wait_for_termination()


if __name__ == "__main__":
    logging.basicConfig()
    serve()

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def run():
    # NOTE(gRPC Python Team): .close() is possible on a channel and should be
    # used in circumstances in which the with statement does not fit the needs
    # of the code.
    print("Will try to greet world ...")
    with grpc.insecure_channel("localhost:50051") as channel:
        stub = helloworld_pb2_grpc.GreeterStub(channel)
        response = stub.SayHello(helloworld_pb2.HelloRequest(name="you"))
        print("Greeter client received: " + response.message)
        response = stub.SayHelloAgain(helloworld_pb2.HelloRequest(name="you"))
        print("Greeter client received: " + response.message)

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python greeter_server.py
python greeter_client.py

# 出力
Greeter client received: Hello, you!
Greeter client received: Hello Again, you!