server.go

const port = ":50051"

type gravatarService struct{}

func (s *gravatarService) Generate(ctx context.Context, in *pb.GravatarRequest) (*pb.GravatarResponse, error) {
	log.Printf("Received email %v with size %v", in.Email, in.Size)
	return &pb.GravatarResponse{Url: gravatar(in.Email, in.Size)}, nil
}

func main() {
	lis, err := net.Listen("tcp", port)
	if err != nil {
		log.Fatalf("Failed to listen on port: %v", err)
	}

	server := grpc.NewServer()
	pb.RegisterGravatarServiceServer(server, &gravatarService{})
	if err := server.Serve(lis); err != nil {
		log.Fatal(errors.Wrap(err, "Failed to start server!"))
	}
}