listen address cli flag

cmd/itko-monitor/main.go

@@ -13,6 +13,7 @@ import (
 func main() {
 	// Parse the command-line flags
 	storeAddress := flag.String("store-address", "", "Tile storage url. Must end with a trailing slash.")
+	listenAddress := flag.String("listen-address", "", "IP and port to listen on for incoming connections.")
 	maskSize := flag.Int("mask-size", 0, "Mask size for the quadtree.")
 	flag.Parse()
 
@@ -22,13 +23,19 @@ func main() {
 		os.Exit(1)   // Exit with a non-zero status
 	}
 
+	if *listenAddress == "" {
+		fmt.Println("Error: -listen-address flag must be set")
+		flag.Usage() // Print the usage message
+		os.Exit(1)   // Exit with a non-zero status
+	}
+
 	if *maskSize == 0 {
 		fmt.Println("Error: -mask-size flag must be set")
 		flag.Usage() // Print the usage message
 		os.Exit(1)   // Exit with a non-zero status
 	}
 
-	listener, err := net.Listen("tcp", "localhost:8080")
+	listener, err := net.Listen("tcp", *listenAddress)
 	if err != nil {
 		log.Fatalf("failed to bind to address: %v", err)
 	}