feat(agent): SIGHUP 重读节点本地配置并热重渲染,不踢在线用户

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/cmd/agent/main.go

@@ -44,6 +44,23 @@ func main() {
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 	defer stop()
 
+	// SIGHUP 重读节点本地配置(acl.json / warp.json)并重渲染。走 sing-box 的 SIGHUP
+	// 热重载路径,在线用户不掉线;重启 agent 则会冷启 sing-box,把所有人踢下线。
+	hup := make(chan os.Signal, 1)
+	signal.Notify(hup, syscall.SIGHUP)
+	defer signal.Stop(hup)
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-hup:
+				log.Printf("[pangolin-agent] SIGHUP: re-reading node-local config (acl.json/warp.json)")
+				agent.SingBox().Refresh()
+			}
+		}
+	}()
+
 	log.Printf("[pangolin-agent] starting (control-plane=%s, version=%s)", cfg.ControlPlaneAddr, cfg.AgentVersion)
 	start := time.Now()
 	if err := agent.Run(ctx); err != nil {