grpc-function-sayhello.go

func (s *server) SayHello(ctx context.Context, in *api.HelloRequest) (*api.HelloResponse, error) {
	tracer := otel.GetTracerProvider().Tracer("webserver-grpc")
	_, span := tracer.Start(ctx, "SayHello-span")
	defer span.End()

	fmt.Println(ctx)
	log.Printf("Received: %v\n", in.GetGreeting())
	time.Sleep(50 * time.Millisecond)

	return &api.HelloResponse{Reply: "Hello " + in.Greeting}, nil
}