update: 整理项目结构 重写中间件 提高复用性

internal/middleware/requestid.go

@@ -0,0 +1,32 @@
+package middleware
+
+import (
+	"fmt"
+	"sync/atomic"
+
+	"github.com/gin-gonic/gin"
+)
+
+const RequestIDKey = "reqID"
+
+var globalReqID atomic.Int64
+
+// RequestID 生成自增的请求 ID 并注入上下文及响应头
+func RequestID() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		id := globalReqID.Add(1)
+		c.Set(RequestIDKey, id)
+		c.Writer.Header().Set("X-Request-ID", fmt.Sprintf("%d", id))
+		c.Next()
+	}
+}
+
+// GetReqID 从上下文中获取请求 ID
+func GetReqID(c *gin.Context) int64 {
+	if v, ok := c.Get(RequestIDKey); ok {
+		if id, ok2 := v.(int64); ok2 {
+			return id
+		}
+	}
+	return 0
+}