Fix Services & Update the middleware && others

internal/middleware/request_id.go

@@ -0,0 +1,39 @@
+// Filename: internal/middleware/request_id.go
+
+package middleware
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+)
+
+// RequestIDMiddleware 请求 ID 追踪中间件
+func RequestIDMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		// 1. 尝试从 Header 获取现有的 Request ID
+		requestID := c.GetHeader("X-Request-Id")
+
+		// 2. 如果没有，生成新的
+		if requestID == "" {
+			requestID = uuid.New().String()
+		}
+
+		// 3. 设置到 Context
+		c.Set("request_id", requestID)
+
+		// 4. 返回给客户端（用于追踪）
+		c.Writer.Header().Set("X-Request-Id", requestID)
+
+		c.Next()
+	}
+}
+
+// GetRequestID 获取当前请求的 Request ID
+func GetRequestID(c *gin.Context) string {
+	if id, exists := c.Get("request_id"); exists {
+		if requestID, ok := id.(string); ok {
+			return requestID
+		}
+	}
+	return ""
+}