Creating main.go

Before creating main.go file we are assuming that the user has created a go.mod with the name github.com/myuser/myrepo, if not please refer to Creating go.mod file. The import here is using the path to the generated files in proto/helloworld relative to the root of the repository.

  1. package main
  3. import (
  4.     "context"
  5.     "log"
  6.     "net"
  8.     "google.golang.org/grpc"
  10.     helloworldpb "github.com/myuser/myrepo/proto/helloworld"
  11. )
  13. type server struct{
  14.     helloworldpb.UnimplementedGreeterServer
  15. }
  17. func NewServer() *server {
  18.     return &server{}
  19. }
  21. func (s *server) SayHello(ctx context.Context, in *helloworldpb.HelloRequest) (*helloworldpb.HelloReply, error) {
  22.     return &helloworldpb.HelloReply{Message: in.Name + " world"}, nil
  23. }
  25. func main() {
  26.     // Create a listener on TCP port
  27.     lis, err := net.Listen("tcp", ":8080")
  28.     if err != nil {
  29.         log.Fatalln("Failed to listen:", err)
  30.     }
  32.     // Create a gRPC server object
  33.     s := grpc.NewServer()
  34.     // Attach the Greeter service to the server
  35.     helloworldpb.RegisterGreeterServer(s, &server{})
  36.     // Serve gRPC Server
  37.     log.Println("Serving gRPC on 0.0.0.0:8080")
  38.     log.Fatal(s.Serve(lis))
  39. }

Read More

For more refer to gRPC docs https://grpc.io/docs/languages/go/.

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