feat: 封装 sendWs 工具函数，统一 WebSocket 消息格式

backend/gateway/internal/ws/client.go

@@ -36,6 +36,47 @@ func NewClient(hub *Hub, conn *websocket.Conn) *Client {
 	}
 }
 
+// sendWs 发送 WebSocket 消息，自动生成 seq、cmd、timestamp
+func (c *Client) sendWs(cmd string, data interface{}) error {
+	// 生成唯一请求ID
+	seq := "req_" + time.Now().Format("20060102150405") + "_" + generateRandomString(8)
+
+	// 构建消息
+	message := map[string]interface{}{
+		"seq":       seq,
+		"cmd":       cmd,
+		"data":      data,
+		"timestamp": time.Now().UnixMilli(),
+	}
+
+	// 将消息转换为 JSON
+	msgBytes, err := json.Marshal(message)
+	if err != nil {
+		log.Printf("error marshaling message: %v", err)
+		return err
+	}
+
+	// 写入 WebSocket 连接
+	c.conn.SetWriteDeadline(time.Now().Add(writeWait))
+	if err := c.conn.WriteMessage(websocket.TextMessage, msgBytes); err != nil {
+		log.Printf("error writing message: %v", err)
+		return err
+	}
+
+	return nil
+}
+
+// generateRandomString 生成随机字符串
+func generateRandomString(length int) string {
+	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	result := make([]byte, length)
+	for i := range result {
+		result[i] = charset[time.Now().UnixNano()%int64(len(charset))]
+		time.Sleep(1 * time.Nanosecond)
+	}
+	return string(result)
+}
+
 func (c *Client) readPump() {
 	defer func() {
 		c.hub.unregister <- c
@@ -244,14 +285,10 @@ func (c *Client) handleNewCommand(seq string, cmd string, data interface{}) {
 
 			if !accountOk || !passwordOk {
 				// 回复错误信息
-				errorResponse := map[string]interface{}{
-					"seq":       seq,
-					"cmd":       cmd,
+				c.sendWs(cmd, map[string]interface{}{
 					"type":    "error",
 					"content": "Invalid register command: missing account or password",
-					"timestamp": time.Now().UnixMilli(),
-				}
-				c.sendJSON(errorResponse)
+				})
 				return
 			}
 
@@ -262,21 +299,15 @@ func (c *Client) handleNewCommand(seq string, cmd string, data interface{}) {
 					resp, err := c.hub.userService.Register(nil, account, password)
 					if err != nil {
 						// 回复错误信息
-						errorResponse := map[string]interface{}{
-							"seq":       seq,
-							"cmd":       cmd,
+						c.sendWs(cmd, map[string]interface{}{
 							"type":    "error",
 							"content": "Register failed: " + err.Error(),
-							"timestamp": time.Now().UnixMilli(),
-						}
-						c.sendJSON(errorResponse)
+						})
 						return
 					}
 
 					// 回复成功信息
-					successResponse := map[string]interface{}{
-						"seq":       seq,
-						"cmd":       cmd,
+					c.sendWs(cmd, map[string]interface{}{
 						"type":    "text",
 						"content": "Register successful",
 						"data": map[string]interface{}{
@@ -285,48 +316,25 @@ func (c *Client) handleNewCommand(seq string, cmd string, data interface{}) {
 							"message": resp.Response.Message,
 							"code":    resp.Response.Code,
 						},
-						"timestamp": time.Now().UnixMilli(),
-					}
-					c.sendJSON(successResponse)
+					})
 				}()
 			} else {
 				// 回复错误信息
-				errorResponse := map[string]interface{}{
-					"seq":       seq,
-					"cmd":       cmd,
+				c.sendWs(cmd, map[string]interface{}{
 					"type":    "error",
 					"content": "User service not available",
-					"timestamp": time.Now().UnixMilli(),
-				}
-				c.sendJSON(errorResponse)
+				})
 			}
 		}
 		return
 	default:
 		// 其他命令处理
-		response := map[string]interface{}{
-			"seq":       seq,
-			"cmd":       cmd,
+		c.sendWs(cmd, map[string]interface{}{
 			"type":    "text",
 			"content": "Command executed successfully",
 			"data":    data,
-			"timestamp": time.Now().UnixMilli(),
-		}
-		c.sendJSON(response)
+		})
 	}
 }
 
-func (c *Client) sendJSON(data interface{}) {
-	// 将数据转换为 JSON 并发送
-	msgBytes, err := json.Marshal(data)
-	if err != nil {
-		log.Printf("error marshaling message: %v", err)
-		return
-	}
 
-	// 写入 WebSocket 连接
-	c.conn.SetWriteDeadline(time.Now().Add(writeWait))
-	if err := c.conn.WriteMessage(websocket.TextMessage, msgBytes); err != nil {
-		log.Printf("error writing message: %v", err)
-	}
-}