From 22d721d1e4e1208a0cd40979f24e2ffab70a9abf Mon Sep 17 00:00:00 2001
From: Roland Bewick <roland.bewick@gmail.com>
Date: Wed, 25 Sep 2024 13:20:35 +0700
Subject: [PATCH] fix: prevent user starting wails app twice

---
 main_wails.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/main_wails.go b/main_wails.go
index 27764a5d..806ad7cf 100644
--- a/main_wails.go
+++ b/main_wails.go
@@ -6,6 +6,7 @@ package main
 import (
 	"context"
 	"embed"
+	"net"
 
 	"github.com/getAlby/hub/logger"
 	"github.com/getAlby/hub/service"
@@ -20,6 +21,14 @@ var assets embed.FS
 var appIcon []byte
 
 func main() {
+	// Get a port lock on a rare port to prevent the app running twice
+	listener, err := net.Listen("tcp", "0.0.0.0:21420")
+	if err != nil {
+		log.Println("Another instance of Alby Hub is already running.")
+		return
+	}
+	defer listener.Close()
+
 	log.Info("Alby Hub starting in WAILS mode")
 	ctx, cancel := context.WithCancel(context.Background())
 	svc, _ := service.NewService(ctx)