git clone https://github.com/grpc/grpc-go.git $GOPATH/src/google.golang.org/grpc

go get -u github.com/golang/protobuf/{proto,protoc-gen-go}

git clone https://github.com/protocolbuffers/protobuf.git
cd $GOPATH/src/github.com/protocolbuffers/
./autogen.sh
./configure
make -j12
make install

git https://github.com/googleapis/go-genproto.git

[root@wangjq]# protoc --version
libprotoc 3.10.0

[root@wangjq demo]# tree
.
├── client
│   └── main.go
├── example
│   └── data.proto
└── server└── main.go3 directories, 4 files

syntax = "proto3"; //指定proto版本

package proto;//定义请求结构
message HelloRequest{string name=1;
}//定义响应结构
message HelloReply{string message=1;
}//定义Hello服务
service Hello{//定义服务中的方法
    rpc SayHello(HelloRequest) returns (HelloReply){}
}

protoc -I . --go_out=plugins=grpc:. ./data.proto 

package mainimport (pb "demo/example""fmt""golang.org/x/net/context""google.golang.org/grpc""net"
)const (//gRPC服务地址Address = "127.0.0.1:50052"
)//定义一个helloServer并实现约定的接口
type helloService struct{}func (h helloService) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {resp := new(pb.HelloReply)resp.Message = "hello" + in.Name + "." return resp, nil
}var HelloServer = helloService{}func main() {listen, err := net.Listen("tcp", Address)if err != nil {fmt.Printf("failed to listen:%v", err)}//实现gRPC Servers := grpc.NewServer()//注册helloServer为客户端提供服务pb.RegisterHelloServer(s, HelloServer) //内部调用了s.RegisterServer()fmt.Println("Listen on" + Address)s.Serve(listen)
}

package mainimport (pb "demo/example""fmt""golang.org/x/net/context""google.golang.org/grpc"
)const (Address = "127.0.0.1:50052"
)func main() {//连接gRPC服务器conn, err := grpc.Dial(Address, grpc.WithInsecure())if err != nil {fmt.Println(err)}   defer conn.Close()//初始化客户端c := pb.NewHelloClient(conn)//调用方法reqBody := new(pb.HelloRequest)reqBody.Name = "gRPC"r, err := c.SayHello(context.Background(), reqBody)if err != nil {fmt.Println(err)}fmt.Println(r.Message)
}

服务端运行：
[root@wangjq demo]# go run server/main.go
Listen on127.0.0.1:50052客户端运行：
[root@wangjq demo]# go run client/main.go
hellogRPC.