rpc学习

步骤一.环境准备：

      安装gRPC  :  pip install grpcio

      安装 ProtoBuf 相关的 python 依赖库:  pip install protobuf

      安装 python grpc 的 protobuf 编译工具： pip install grpcio-tools

步骤二.开始定义并编译proto文件：

创建文件夹 my_proto, 在里面写一个helloworld.proto文件

-------------------------helloworld.proto ：------------------------------------

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) {}
}

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

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

 

然后编译这个文件： python -m grpc_tools.protoc -I./ --python_out=. --grpc_python_out=. helloworld.proto

会生成2个文件： 

        helloworld_pb2.py   （包含request(HelloRequest) 和 response(HelloReply) 类）

        helloworld_pb2_grpc.py   （包含生成的 客户端(GreeterStub)和服务端(GreeterServicer)的类。）

步骤三.开始写 client 和 server 代码

----------------------------client.py 开始---------------------------------------------------------------

from __future__ import print_function

import grpc

import helloworld_pb2
import helloworld_pb2_grpc

def run():
    channel = grpc.insecure_channel('localhost:50051')
    stub = helloworld_pb2_grpc.GreeterStub(channel)
    response = stub.SayHello(helloworld_pb2.HelloRequest(name='Hello World！ This is message from client!'))
    print("Greeter client received: " + response.message)

if __name__=='__main__':
    run()

----------------------------server.py 开始---------------------------------------------------------------

# -*- coding=utf-8 -*-

from concurrent import futures
import time
import grpc
import helloworld_pb2
import helloworld_pb2_grpc

_ONE_DAY_IN_SECONDS = 60 * 60 * 24

class Greeter(helloworld_pb2_grpc.GreeterServicer):
    # 工作函数
    def SayHello(self, request, context):
        print(request.name)  
        message = "This message is from Server.And what i want to say is hello " " + request.name + " "";
        return helloworld_pb2.HelloReply(message = message)

def serve():
     # gRPC 服务器
    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
    helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
    server.add_insecure_port('[::]:50051')
    print("sever is opening ,waiting for message...")
    server.start()    # start() 不会阻塞，如果运行时你的代码没有其它的事情可做，你可能需要循环等待。
    try:
        while True:
        time.sleep(_ONE_DAY_IN_SECONDS)
    except KeyboardInterrupt:
        server.stop(0)

if __name__ == "__main__":
    serve()

我们最后的文件结构是这样：

       my_proto  ： helloworld.proto 、helloworld_pb2_grpc.py、 helloworld_pb2.py  、client.py 、server.py

最后：看看运行效果：

>python server.py 
sever is opening ,waiting for message...
Hello World！ This is message from client!
Hello World！ This is message from client!
Hello World！ This is message from client!

>python client.py
Greeter client received: This message is from Server.And what i want to say is hello " Hello World！ This is message from client! "