python grpc异步编程

以下是使用Python grpc实现异步编程的步骤：

1. 安装grpcio和grpcio-tools库

pip install grpcio grpcio-tools

2. 编写.proto文件，定义服务和消息类型

syntax = "proto3";

package helloworld;

service Greeter {
  rpc SayHello (HelloRequest) returns (HelloReply) {}
}

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

3. 使用protoc编译.proto文件，生成Python代码

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

4. 编写服务端代码

import grpc
import helloworld_pb2
import helloworld_pb2_grpc

class Greeter(helloworld_pb2_grpc.GreeterServicer):
    async def SayHello(self, request, context):
        message = 'Hello, %s!' % request.name
        return helloworld_pb2.HelloReply(message=message)

async def serve():
    server = grpc.aio.server()
    helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
    listen_addr = '[::]:50051'
    server.add_insecure_port(listen_addr)
    await server.start()
    print(f'server listening on {listen_addr}')
    await server.wait_for_termination()

if __name__ == '__main__':
    asyncio.run(serve())

5. 编写客户端代码

import grpc
import helloworld_pb2
import helloworld_pb2_grpc

async def run():
    async with grpc.aio.insecure_channel('localhost:50051') as channel:
        stub = helloworld_pb2_grpc.GreeterStub(channel)
        response = await stub.SayHello(helloworld_pb2.HelloRequest(name='world'))
    print("Greeter client received: " + response.message)

if __name__ == '__main__':
    asyncio.run(run())