GRPC使用

代码地址：http//gitee.com/zqwlai/go-test/grpc

 

1. 定义proto

syntax = "proto3";

option java_multiple_files = true;
option go_package = "./g";
package g;

// The greeting service definition.
service Greeter {
  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;
}

 

在当前目录执行 protoc -I . --go_out=plugins=grpc:. helloworld.proto，会在g/目录下生成helloworld.pb.go



2. 服务端

//go:generate protoc -I ../helloworld --go_out=plugins=grpc:../helloworld ../helloworld/helloworld.proto

package main

import (
    "github.com/go-test/grpc/g"
    "log"
    "net"

    "golang.org/x/net/context"
    "google.golang.org/grpc"

    "google.golang.org/grpc/reflection"
)

const (
    port = ":30000"
)

// server is used to implement helloworld.GreeterServer.
type server struct{}

// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *g.HelloRequest) (*g.HelloReply, error) {
    return &g.HelloReply{Message: "Hello " + in.Name}, nil
}

func main() {
    lis, err := net.Listen("tcp", port)
    if err != nil {
        log.Fatalf("failed to listen: %v", err)
    }
    s := grpc.NewServer()
    g.RegisterGreeterServer(s, &server{})
    // Register reflection service on gRPC server.
    reflection.Register(s)
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}

 

3. 客户端

package main

import (
    "log"
    "os"

    "github.com/go-test/grpc/g"
    "golang.org/x/net/context"
    "google.golang.org/grpc"
        "time"
)

const (
    address     = "localhost:30000"
    defaultName = "world"
)

func main() {
    // Set up a connection to the server.
    conn, err := grpc.Dial(address, grpc.WithInsecure())
    if err != nil {
        log.Fatalf("did not connect: %v", err)
    }
    defer conn.Close()
    c := g.NewGreeterClient(conn)

    // Contact the server and print out its response.
    name := defaultName
    if len(os.Args) > 1 {
        name = os.Args[1]
    }
    r, err := c.SayHello(context.Background(), &g.HelloRequest{Name: name})
    if err != nil {
        log.Fatalf("could not greet: %v", err)
    }
    log.Printf("Greeting: %s", r.Message)
        time.Sleep(5*time.Second)
}