4.5 go下grpc开发体验

1. 下载工具

如果觉得下载较慢可以点击这里下载：
protoc-21.3-linux-x86_64.zip
protoc-21.3-win64.zip
下载完成后解压后记得将路径添加到环境变量中

2. 下载go的依赖包

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

3. proto文件

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

4. 生成go文件

protoc -I . helloworld.proto --go_out=plugins=grpc:.

5. 服务端代码

package main
import (
    "context"
    "fmt"
    "google.golang.org/grpc"
    "grpc_demo/hello"
    "net"
)
type Server struct {
}
func (s *Server)  SayHello(ctx context.Context,request *hello.HelloRequest)(*hello.HelloReply,error){
    return &hello.HelloReply{Message:"Hello "+request.Name},nil
}
func main()  {
    g := grpc.NewServer()
    s := Server{}
    hello.RegisterGreeterServer(g,&s)
    lis, err := net.Listen("tcp", fmt.Sprintf(":8080"))
    if err != nil {
        panic("failed to listen: "+err.Error())
    }
    g.Serve(lis)
}

6. 客户端

package main
import (
    "context"
    "fmt"
    "google.golang.org/grpc"
    "grpc_demo/proto"
)
func main()  {
    conn,err := grpc.Dial("127.0.0.1:8080",grpc.WithInsecure())
    if err!=nil{
        panic(err)
    }
    defer conn.Close()
    c := hello.NewGreeterClient(conn)
    r,err := c.SayHello(context.Background(),&hello.HelloRequest{Name:"bobby"})
    if err!=nil{
        panic(err)
    }
    fmt.Println(r.Message)
}