fix: 判断 conn 是否存在，防止 NOP

main.go

@@ -12,13 +12,17 @@ func main() {
 	if err := config.LoadConfig(); err != nil {
 		log.Fatalf("Error loading config: %v", err)
 	}
+	addr := fmt.Sprintf("%s:%d", config.Conf.Server.Host, config.Conf.Server.Port)
 
 	r := gin.Default()
-
 	router.SetupRoutes(r)
 
-	addr := fmt.Sprintf("%s:%d", config.Conf.Server.Host, config.Conf.Server.Port)
-	if err := r.Run(addr); err != nil {
-		fmt.Println("Failed to start server:", err)
-	}
+	go func() {
+		err := r.Run(addr)
+		if err != nil {
+			fmt.Println("Failed to start server:", err)
+		}
+	}()
+
+	select {}
 }

router/handler/onvif/subscription.go

@@ -14,7 +14,16 @@ func CreateEventSubscription(c *gin.Context) {
 	xaddr := c.Param("xaddr")
 	callbackURL := event.AttributedURIType(fmt.Sprintf("%s/onvif/subscriptions/%s/callback", config.Conf.App.URL, xaddr))
 	log.Printf("CreateEventSubscription callback URL: %s", callbackURL)
-	result, err := conns[xaddr].SubscribeEvents(callbackURL, "PT60S")
+
+	conn := conns[xaddr]
+	if conn == nil {
+		c.JSON(http.StatusNotFound, gin.H{
+			"message": "Connection not found",
+		})
+		return
+	}
+
+	result, err := conn.SubscribeEvents(callbackURL, "PT60S")
 	if err != nil {
 		c.JSON(http.StatusServiceUnavailable, gin.H{
 			"message": err.Error(),