go运行第一个gRPC程序

装置插件

go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.26go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.1

配置环境变量

将%GOPATH%\bin增加到Path中

创立我的项目

我的项目构造

├─practice│  │  go.mod│  │  go.sum│  ││  ├─client│  │  ├─sample_client│  │  │      client.go│  ││  ├─proto│  │  │  helloworld.proto│  ││  └─server│      ├─simple_server│      │      server.go│

编辑helloword.proto

syntax = "proto3";package proto;      // 包名option go_package = '/grpc/service';    // 指定生成的go代码所寄存的门路，不必提前创立service Greeter {  rpc SayHello (HelloRequest) returns (HelloReply) {}}message HelloRequest {  string name = 1;}message HelloReply {  string message = 1;}

生成go代码

# 进入寄存.proto门路下cd proto# 生成代码protoc --go_out=. --go-grpc_out=. *.proto# 最初一个参数为源文件

生成后的目录构造

├─practice│  │  go.mod│  │  go.sum│  ││  ├─client│  │  ├─sample_client│  │  │      client.go│  ││  ├─proto│  │  │  helloworld.proto│  │  ││  │  └─grpc│  │      └─service│  │              helloworld.pb.go│  │              helloworld_grpc.pb.go│  ││  └─server│      ├─simple_server│      │      server.go│

编辑client.go

package mainimport (    "context"    "flag"    "google.golang.org/grpc"    "log"    pb "practice/proto/grpc/service"    "time")const (    defaultName = "world")var (    addr = flag.String("addr", "localhost:50051", "the address to connect to")    name = flag.String("name", defaultName, "Name to greet"))func main() {    flag.Parse()    // 建设连贯    conn, err := grpc.Dial(*addr, grpc.WithInsecure())    if err != nil {        log.Fatalf("did not connect: %v", err)    }    defer conn.Close()    // 实例化client    c := pb.NewGreeterClient(conn)    // 调用rpc，期待同步响应    ctx, cancel := context.WithTimeout(context.Background(), time.Second)    defer cancel()    r, err := c.SayHello(ctx, &pb.HelloRequest{Name: *name})    if err != nil {        log.Fatalf("could not greet: %v", err)    }    log.Printf("Greeting: %s", r.GetMessage())}

server.go

package mainimport (    "context"    "flag"    "fmt"    "google.golang.org/grpc"    "log"    "net"    pb "practice/proto/grpc/service")var (    port = flag.Int("port", 50051, "The server port"))// server is used to implement helloworld.GreeterServer.type server struct {    pb.UnimplementedGreeterServer}func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {    return &pb.HelloReply{Message: "Hello" + in.GetName()}, nil}func (s *server) SayHelloAgain(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error)  {    return &pb.HelloReply{Message: "Hello Again " + in.GetName()}, nil}func main() {    flag.Parse()    // 监听端口    lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", *port))    if err != nil {        log.Fatalf("failed to listen: %v", err)    }    // 实例化server    s := grpc.NewServer()    pb.RegisterGreeterServer(s, &server{})    log.Printf("server listening at %v", lis.Addr())    if err := s.Serve(lis); err != nil {        log.Fatalf("failed to serve: %v", err)    }}

运行

启动服务端

E:\go_workplace\src\practice>go run server/simple_server/server.go2021/11/29 19:22:27 server listening at 127.0.0.1:50051

启动客户端

E:\go_workplace\src\practice>go run client/sample_client/client.go --name cui2021/11/29 19:23:25 Greeting: Hellocui