实现节点下线功能，优化控制通道和数据通道的连接处理

client/client.go

@@ -43,27 +43,43 @@ func Start() error {
 		return fmt.Errorf("注册节点失败: %w", err)
 	}
 
-	// 建立控制通道
+	// 连接到网关
 	var ctx, cancel = signal.NotifyContext(context.Background(), os.Interrupt, os.Kill)
 	defer cancel()
 
+	var errCh = make(chan error)
 	go func() {
 		for {
 			err = ctrl(ctx, id, host)
 			if err == nil {
+				errCh <- nil
 				return
 			}
+
 			select {
 			case <-ctx.Done():
 				return
 			default:
+				slog.Error("建立控制通道失败", "err", err)
+				slog.Info(fmt.Sprintf("%d 秒后重试", core.RetryInterval))
+			}
+
+			select {
+			case <-ctx.Done():
+				return
+			case <-time.After(time.Duration(core.RetryInterval) * time.Second):
 			}
-			slog.Error("建立控制通道失败", "err", err)
-			slog.Info(fmt.Sprintf("%d 秒后重试", core.RetryInterval))
-			time.Sleep(time.Duration(core.RetryInterval) * time.Second)
 		}
 	}()
 
+	// 等待退出
+	select {
+	case err := <-errCh:
+		if err != nil {
+			slog.Error("控制通道发生错误", "err", err)
+		}
+	}
+
 	// 下线节点
 	slog.Debug("下线节点...")
 	err = report.Offline()

client/report/report.go

@@ -69,5 +69,27 @@ func Online(prov, city, isp string) (id int32, host string, err error) {
 }
 
 func Offline() error {
+	var bytes, err = json.Marshal(map[string]any{
+		"name": env.Name,
+	})
+	if err != nil {
+		return err
+	}
+	var body = strings.NewReader(string(bytes))
+
+	req, err := http.NewRequest("POST", env.EndpointOffline, body)
+	if err != nil {
+		return fmt.Errorf("创建请求失败: %w", err)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("执行请求失败: %w", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return errors.New("状态码: " + resp.Status)
+	}
+
 	return nil
 }