go grpc 使用案例

1.创建 .proto文件

syntax = "proto3";
option go_package="../;helloproto"; // 生成pb文件的存放位子 ../ 上一级目录

package helloworld;

service Helloserver {
  rpc SayHello (HelloRequest) returns (HelloReply) {}
}

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

2.代码生成命令

protoc --go_out=./ ./hello.proto


protoc --go-grpc_out=./  hello.proto

前提条件是必须下载protoc.exe和protoc-gen-go.exe  并且加入环境变量

代码生成后的样子

 有两个pb.go结尾的文件

需要提前安装 net 库

cannot find package “golang.org/x/net/http2“_Bug制造者-CSDN博客（安装流程）

3.代码

service代码：

package main

import (
	"context"
	"google.golang.org/grpc"
	"google.golang.org/grpc/reflection"
	"log"
	"net"
	pb "protobuf/grpc/hello"
)

type Helloserver struct {
	pb.UnimplementedHelloserverServer
}
func(this *Helloserver)SayHello(ctx context.Context, in *pb.HelloRequest) (out *pb.HelloReply, err error){
	return &pb.HelloReply{
		Message: "hello grpc ===> " + in.Name,
	},nil
}

func main() {
	lis, err := net.Listen("tcp", ":8080")
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer() // 创建grpc服务
	pb.RegisterHelloserverServer(s, &Helloserver{})
	// Register reflection service on gRPC server.
	reflection.Register(s)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}

}

client

package main

import (
	"context"
	"log"
	"google.golang.org/grpc"
	pb "protobuf/grpc/hello"
)

const (
	address     = "127.0.0.1:8080"
)

func main() {
	conn, err := grpc.Dial(address, grpc.WithInsecure())
	if err != nil {
		log.Fatalf("客户端连接异常: %v", err)
	}
	defer conn.Close()

	c := pb.NewHelloserverClient(conn)//获取GRPC句柄

	r, err := c.SayHello(context.Background(), &pb.HelloRequest{
		Name: "哈哈",
	})
	if err != nil {
		log.Fatalf("could not greet: %v", err)
	}
	log.Printf("####### get server Greeting response: %s", r.Message)
}

go run grpc_server.go

go run grpc_client.go