log messages for sockets

cmd/udpsocket/main.go

@@ -23,6 +23,7 @@ func CheckDownloaded(filename string) bool {
 }
 
 func main() {
+	log.Println("Program started")
 	pid := os.Getpid()
 	if err := os.WriteFile(filepath.Join(consts.DefaultLinux_d, "udp.pid"), []byte(fmt.Sprint(pid)), 0664); err != nil {
 		fmt.Println("error saving subprocess pid", err)
@@ -37,6 +38,7 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
+	log.Println("Started connection listener")
 	defer conn.Close()
 	buf := make([]byte, 1500)
 
@@ -46,12 +48,15 @@ func main() {
 			log.Println("error creating udp socket", err)
 		}
 		msg := string(buf[:n])
+		log.Printf("Received message : %s\n", msg)
 		if !strings.HasPrefix(msg, "Q:") {
+			log.Println("error: invalid message, this message don't follow the protocol")
 			continue
 		}
 		filename := strings.TrimPrefix(msg, "Q:")
 		if CheckDownloaded(filename) {
 			reply := fmt.Sprintf("H:%s:%d", filename, cfg.Config.HttpPort)
+			log.Printf("Package founded in cache dir, answering with: '%s'\n", reply)
 			conn.WriteToUDP([]byte(reply), remote)
 		}
 	}