linux下golang gRPC配置详解

1.安装gRPC运行环境

go get google.golang.org/grpc

这里的grpc通俗来说就说用在代码里的一个类库，后面的例子可以看到。比较坑的是这里可能需要翻墙.....

2.安装protoc

这里需要安装proto buffer的编译器。首先在官网下载，如c++版本的protobuf-cpp-3.4.1.tar.gz，解压后进行编译：

./configure         
make && make install

3.安装protoc-gen-go

go get -a github.com/golang/protobuf/protoc-gen-go

4.编写proto文件

基于protobuf的跨语言的特性，不难想到它自己实现了一套数据类型。这里有一个简单的例子

//testHello.proto
syntax = "proto3";

package protos;

// The service definition.
service Devops {
    // 定义服务
    rpc SayHello (HelloRequest) returns (Response) {}
}

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

// The response message
message HelloReply {
    string message = 1;
}

message Response {
    enum StatusCode {
        UNDEFINED = 0;
        SUCCESS = 200;
        FAILURE = 500;
    }
    StatusCode status = 1;
    HelloReply msg = 2;
}

然后在终端自动生成pb.go:

protoc --go_out=plugins=grpc:. testHello.proto

5.编写服务端

package main

const (
	port = ":50051"
)

type myserver struct{}

//这里myserver实现了SayHello
func (s *myserver) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.Response, error) {
	fmt.Print("receive " + in.Name)
	return &pb.Response{
		Status:pb.Response_SUCCESS,
		Msg:&pb.HelloReply{Message:"receive " + in.Name},
	}, nil
}

func main() {
	//绑定端口
	lis, err := net.Listen("tcp", port)
	if err != nil{
		log.Fatal("fail to listen")
	}

	s := grpc.NewServer()
	pb.RegisterDevopsServer(s, &myserver{})
	s.Serve(lis)
}

6.编写客户端

package main

const (
	address = "localhost:50051"
)

func main()  {
   //grpc.WithInsecure()指定后才不会报错
	conn, err := grpc.Dial(address, grpc.WithInsecure())

	if err != nil{
		log.Fatal("error....", err)
	}
	c := pb.NewDevopsClient(conn)
	res, _ := c.SayHello(context.Background(), &pb.HelloRequest{"eeee"})

	fmt.Print(res)
}

WithInsecure returns a DialOption which disables transport security for this ClientConn.
Note that transport security is required unless WithInsecure is set.

WithInsecure返回一个DialOption，它在传输过程中不保证安全。除非设置WithInsecure，否则grpc.Dial必须指定安全选项。

参考：

1.https://github.com/google/protobuf/releases
2.http://www.cnblogs.com/YaoDD/p/5504881.html