example grpc go server

main.go

package main
import (
 "context"
 "log"
 "net"
 "google.golang.org/grpc"
 pb "github.com/akursat/grpc-country/countrypb"
)
const (
 port = ":50051"
)
type server struct {
 pb.UnimplementedCountryServiceServer
}
func(s * server) GetCountries(ctx context.Context, in * pb.GetCountriesRequest)( * pb.GetCountriesResponse, error) {
 log.Printf("Received GetCountriesRequest: %v", in )
countries := [] * pb.Country {
 {
 Id: 1,
 Name: "Turkey",
 Flag: "https://upload.wikimedia.org/wikipedia/commons/b/b4/Flag_of_Turkey.svg",
 }, {
 Id: 2,
 Name: "Iran",
 Flag: "https://tr.wikipedia.org/wiki/%C4%B0ran#/media/Dosya:Flag_of_Iran.svg",
 }, {
 Id: 3,
 Name: "China",
 Flag: "https://tr.wikipedia.org/wiki/%C3%87in#/media/Dosya:Flag_of_the_People's_Republic_of_China.svg",
 },
}
 return &pb.GetCountriesResponse {
 Countries: countries,
 }, nil
}
func(s * server) AddCountry(ctx context.Context, in * pb.AddCountryRequest)( * pb.AddCountryResponse, error) {
 log.Printf("Received AddCountryRequest: %v", in )
return &pb.AddCountryResponse {
 Success: "Country added.",
 }, nil
}
func main() {
 log.Printf("Starting server: %v", port)
 lis, err := net.Listen("tcp", port)
 if err != nil {
 log.Fatalf("failed to listen: %v", err)
 }
 s := grpc.NewServer()
 pb.RegisterCountryServiceServer(s, & server {})
 if err := s.Serve(lis);
 err != nil {
 log.Fatalf("failed to serve: %v", err)
 }
}