✨ feat(middleware): add HTTP statistics middleware

middleware/stats.go

@@ -0,0 +1,41 @@
+package middleware
+
+import (
+	"sync/atomic"
+
+	"github.com/gin-gonic/gin"
+)
+
+// HTTPStats 存储HTTP统计信息
+type HTTPStats struct {
+	activeConnections int64
+}
+
+var globalStats = &HTTPStats{}
+
+// StatsMiddleware 统计中间件
+func StatsMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		// 增加活跃连接数
+		atomic.AddInt64(&globalStats.activeConnections, 1)
+		
+		// 确保在请求结束时减少连接数
+		defer func() {
+			atomic.AddInt64(&globalStats.activeConnections, -1)
+		}()
+		
+		c.Next()
+	}
+}
+
+// StatsInfo 统计信息结构
+type StatsInfo struct {
+	ActiveConnections int64 `json:"active_connections"`
+}
+
+// GetStats 获取统计信息
+func GetStats() StatsInfo {
+	return StatsInfo{
+		ActiveConnections: atomic.LoadInt64(&globalStats.activeConnections),
+	}
+}