Golang을 사용하여 RESTful API를 구축하고 gRPC를 사용하는 방법은 무엇입니까?

package main

import (
    "github.com/gin-gonic/gin"
)

func main() {
    router := gin.Default()
    
    router.GET("/hello", HelloHandler)
    router.Run() // 监听端口
}

func HelloHandler(c *gin.Context) {
    c.JSON(200, gin.H{
        "message": "Hello, world!",
    })
}

syntax = "proto3";
package example;
message HelloRequest {
  string name = 1;
}
message HelloResponse {
  string message = 1;
}
service HelloService {
  rpc SayHello (HelloRequest) returns (HelloResponse);
}

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

package main

import (
    "context"
    "fmt"
    "log"
    "net"

    "example/hello"

    "google.golang.org/grpc"
)

type helloServer struct{}

func (s *helloServer) SayHello(ctx context.Context, req *hello.HelloRequest) (*hello.HelloResponse, error) {
    return &hello.HelloResponse{Message: "Hello, " + req.Name}, nil
}

func main() {
    lis, err := net.Listen("tcp", ":5000")
    if err != nil {
        log.Fatalf("failed to listen: %v", err)
    }
    s := grpc.NewServer()
    hello.RegisterHelloServiceServer(s, &helloServer{})
    log.Println("gRPC server listening on port 5000")
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}