feat: implement user and forward max connection limit (#461)

* docs: add implementation plan for max conn limit

* feat: add CLimiters support for websocket reporter

* feat: add max_conn field to user and forward models

* feat: implement max conn limiter dispatching

* feat: add maxConn to user and forward CRUD API

* feat: add max conn UI to user management and forward rules

* fix: load MaxConn in get forward record and add e2e contract test for max conn limit

go-gost/x/socket/limiter.go

@@ -102,3 +102,71 @@ type updateLimiterRequest struct {
 type deleteLimiterRequest struct {
 	Limiter string `json:"limiter"`
 }
+
+func createConnLimiter(req createLimiterRequest) error {
+	name := strings.TrimSpace(req.Data.Name)
+	if name == "" {
+		return errors.New("limiter name is required")
+	}
+	req.Data.Name = name
+
+	if registry.ConnLimiterRegistry().IsRegistered(name) {
+		return errors.New("conn limiter " + name + " already exists")
+	}
+
+	v := parser.ParseConnLimiter(&req.Data)
+
+	if err := registry.ConnLimiterRegistry().Register(name, v); err != nil {
+		return errors.New("conn limiter " + name + " already exists")
+	}
+
+	if c := config.Global(); c != nil {
+		c.CLimiters = append(c.CLimiters, &req.Data)
+	}
+	return nil
+}
+
+func updateConnLimiter(req updateLimiterRequest) error {
+	name := strings.TrimSpace(req.Limiter)
+	req.Data.Name = name
+	if registry.ConnLimiterRegistry().IsRegistered(name) {
+		registry.ConnLimiterRegistry().Unregister(name)
+	}
+
+	v := parser.ParseConnLimiter(&req.Data)
+
+	if err := registry.ConnLimiterRegistry().Register(name, v); err != nil {
+		return errors.New("conn limiter " + name + " already exists")
+	}
+
+	if c := config.Global(); c != nil {
+		for i := range c.CLimiters {
+			if c.CLimiters[i].Name == name {
+				c.CLimiters[i] = &req.Data
+				return nil
+			}
+		}
+		c.CLimiters = append(c.CLimiters, &req.Data)
+	}
+	return nil
+}
+
+func deleteConnLimiter(req deleteLimiterRequest) error {
+	name := strings.TrimSpace(req.Limiter)
+
+	if registry.ConnLimiterRegistry().IsRegistered(name) {
+		registry.ConnLimiterRegistry().Unregister(name)
+	}
+
+	if c := config.Global(); c != nil {
+		limiteres := c.CLimiters
+		c.CLimiters = nil
+		for _, s := range limiteres {
+			if s.Name == name {
+				continue
+			}
+			c.CLimiters = append(c.CLimiters, s)
+		}
+	}
+	return nil
+}

go-gost/x/socket/websocket_reporter.go

@@ -836,6 +836,18 @@ func (w *WebSocketReporter) routeCommand(cmd CommandMessage) {
 		err = w.handleDeleteLimiter(cmd.Data)
 		response.Type = "DeleteLimitersResponse"
 		needSaveConfig = true
+	case "AddCLimiters":
+		err = w.handleAddCLimiter(cmd.Data)
+		response.Type = "AddCLimitersResponse"
+		needSaveConfig = true
+	case "UpdateCLimiters":
+		err = w.handleUpdateCLimiter(cmd.Data)
+		response.Type = "UpdateCLimitersResponse"
+		needSaveConfig = true
+	case "DeleteCLimiters":
+		err = w.handleDeleteCLimiter(cmd.Data)
+		response.Type = "DeleteCLimitersResponse"
+		needSaveConfig = true
 
 	// TCP Ping 诊断命令（只读，不需要保存配置）
 	case "TcpPing":
@@ -1130,6 +1142,67 @@ func (w *WebSocketReporter) handleDeleteLimiter(data interface{}) error {
 	return deleteLimiter(deleteReq)
 }
 
+func (w *WebSocketReporter) handleAddCLimiter(data interface{}) error {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return fmt.Errorf("序列化数据失败: %v", err)
+	}
+
+	var limiterConfig config.LimiterConfig
+	if err := json.Unmarshal(jsonData, &limiterConfig); err != nil {
+		return fmt.Errorf("解析限流器配置失败: %v", err)
+	}
+
+	req := createLimiterRequest{Data: limiterConfig}
+	return createConnLimiter(req)
+}
+
+func (w *WebSocketReporter) handleUpdateCLimiter(data interface{}) error {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return fmt.Errorf("序列化数据失败: %v", err)
+	}
+
+	var updateReq struct {
+		Limiter string               `json:"limiter"`
+		Data    config.LimiterConfig `json:"data"`
+	}
+
+	if err := json.Unmarshal(jsonData, &updateReq); err != nil {
+		var limiterConfig config.LimiterConfig
+		if err := json.Unmarshal(jsonData, &limiterConfig); err != nil {
+			return fmt.Errorf("解析更新请求失败: %v", err)
+		}
+		updateReq.Limiter = limiterConfig.Name
+		updateReq.Data = limiterConfig
+	}
+
+	req := updateLimiterRequest{
+		Limiter: updateReq.Limiter,
+		Data:    updateReq.Data,
+	}
+	return updateConnLimiter(req)
+}
+
+func (w *WebSocketReporter) handleDeleteCLimiter(data interface{}) error {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return fmt.Errorf("序列化数据失败: %v", err)
+	}
+
+	var deleteReq deleteLimiterRequest
+
+	if err := json.Unmarshal(jsonData, &deleteReq); err != nil {
+		var limiterName string
+		if err := json.Unmarshal(jsonData, &limiterName); err != nil {
+			return fmt.Errorf("解析删除请求失败: %v", err)
+		}
+		deleteReq.Limiter = limiterName
+	}
+
+	return deleteConnLimiter(deleteReq)
+}
+
 // handleSetProtocol 处理设置屏蔽协议的命令
 func (w *WebSocketReporter) handleSetProtocol(data interface{}) error {
 	jsonData, err := json.Marshal(data)