linux下golang gRPC配置詳解

1.安裝gRPC運行環境

go get google.golang.org/grpc

這里的grpc通俗來說就說用在代碼里的一個類庫，后面的例子可以看到。比較坑的是這里可能需要翻牆.....

2.安裝protoc

這里需要安裝proto buffer的編譯器。首先在官網下載，如c++版本的protobuf-cpp-3.4.1.tar.gz，解壓后進行編譯：

./configure         
make && make install

3.安裝protoc-gen-go

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

4.編寫proto文件

基於protobuf的跨語言的特性，不難想到它自己實現了一套數據類型。這里有一個簡單的例子

//testHello.proto
syntax = "proto3";

package protos;

// The service definition.
service Devops {
    // 定義服務
    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;
}

然后在終端自動生成pb.go:

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

5.編寫服務端

package main

const (
	port = ":50051"
)

type myserver struct{}

//這里myserver實現了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() {
	//綁定端口
	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.編寫客戶端

package main

const (
	address = "localhost:50051"
)

func main()  {
   //grpc.WithInsecure()指定后才不會報錯
	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返回一個DialOption，它在傳輸過程中不保證安全。除非設置WithInsecure，否則grpc.Dial必須指定安全選項。

參考：

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