golang下grpc框架的使用编写示例

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

syntax = "proto3";
package services;
option go_package = "./;proto";
service Greeter {
    rpc SayHello (HelloRequest) returns (HelloReply);
}
message HelloRequest {
    string name = 1;
}
message HelloReply {
    string message = 1;
}

cd到proto目录下
命令：protoc -I . hello.proto   --go_out=plugins=grpc:.
命令解释：
protoc -I .：在当前路径下寻找hello.proto文件
--go_out=plugins=grpc:.  ：生成go语言的proto文件放在当前路径下

package main
import (
	"context"
	"file_test/grpc_go/proto"
	"net"

	"google.golang.org/grpc"
)
type Server struct {}
// 业务逻辑
func (s *Server) SayHello(ctx context.Context, request *proto.HelloRequest) (*proto.HelloReply, error) {
	res := &proto.HelloReply{
		Message: "hello " + request.Name,
	}
	return res, nil
}
// 启动rpc的server服务
func start() {
	// 1.实例化server
	g := grpc.NewServer()
	// 2.注册逻辑到server中
	proto.RegisterGreeterServer(g,&Server{})
	// 3.启动server
	lis,err:=net.Listen("tcp","127.0.0.1:8081")
	if err !=nil{
		panic("监听错误:"+err.Error())
	}

	err = g.Serve(lis)
	if err !=nil{
		panic("启动错误:"+err.Error())
	}
}
func main() {
	start()
}

package main
import (
	"context"
	"file_test/grpc_go/proto"
	"fmt"

	"google.golang.org/grpc"
)
// rpc调用
func clientRpc(body map[string]string) (res *proto.HelloReply, err error) {
	name := body["name"]
	conn, err := grpc.Dial("127.0.0.1:8081", grpc.WithInsecure())
	if err != nil {
		return nil,err
	}
	defer conn.Close()
	rpc := proto.NewGreeterClient(conn)
	response, err := rpc.SayHello(context.Background(), &proto.HelloRequest{Name: name})
	if err != nil {
		return nil,err
	}
	return response,nil
}
// 业务代码
func start() {
	body := make(map[string]string)
	body["name"] = "jeff"
	response,err := clientRpc(body)
	if err!=nil{
		fmt.Println("rpc调用失败:",err)
		return
	}
	fmt.Println(response.Message)
}
func main() {
	start()
}
//结果：
hello jeff