✨ init project

middleware/limit_ip.go

@@ -0,0 +1,92 @@
+package middleware
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+
+	"go.uber.org/zap"
+
+	"git.echol.cn/loser/lckt/global"
+	"git.echol.cn/loser/lckt/model/common/response"
+	"github.com/gin-gonic/gin"
+)
+
+type LimitConfig struct {
+	// GenerationKey 根据业务生成key 下面CheckOrMark查询生成
+	GenerationKey func(c *gin.Context) string
+	// 检查函数,用户可修改具体逻辑,更加灵活
+	CheckOrMark func(key string, expire int, limit int) error
+	// Expire key 过期时间
+	Expire int
+	// Limit 周期时间
+	Limit int
+}
+
+func (l LimitConfig) LimitWithTime() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if err := l.CheckOrMark(l.GenerationKey(c), l.Expire, l.Limit); err != nil {
+			c.JSON(http.StatusOK, gin.H{"code": response.ERROR, "msg": err.Error()})
+			c.Abort()
+			return
+		} else {
+			c.Next()
+		}
+	}
+}
+
+// DefaultGenerationKey 默认生成key
+func DefaultGenerationKey(c *gin.Context) string {
+	return "GVA_Limit" + c.ClientIP()
+}
+
+func DefaultCheckOrMark(key string, expire int, limit int) (err error) {
+	// 判断是否开启redis
+	if global.GVA_REDIS == nil {
+		return err
+	}
+	if err = SetLimitWithTime(key, limit, time.Duration(expire)*time.Second); err != nil {
+		global.GVA_LOG.Error("limit", zap.Error(err))
+	}
+	return err
+}
+
+func DefaultLimit() gin.HandlerFunc {
+	return LimitConfig{
+		GenerationKey: DefaultGenerationKey,
+		CheckOrMark:   DefaultCheckOrMark,
+		Expire:        global.GVA_CONFIG.System.LimitTimeIP,
+		Limit:         global.GVA_CONFIG.System.LimitCountIP,
+	}.LimitWithTime()
+}
+
+// SetLimitWithTime 设置访问次数
+func SetLimitWithTime(key string, limit int, expiration time.Duration) error {
+	count, err := global.GVA_REDIS.Exists(context.Background(), key).Result()
+	if err != nil {
+		return err
+	}
+	if count == 0 {
+		pipe := global.GVA_REDIS.TxPipeline()
+		pipe.Incr(context.Background(), key)
+		pipe.Expire(context.Background(), key, expiration)
+		_, err = pipe.Exec(context.Background())
+		return err
+	} else {
+		// 次数
+		if times, err := global.GVA_REDIS.Get(context.Background(), key).Int(); err != nil {
+			return err
+		} else {
+			if times >= limit {
+				if t, err := global.GVA_REDIS.PTTL(context.Background(), key).Result(); err != nil {
+					return errors.New("请求太过频繁，请稍后再试")
+				} else {
+					return errors.New("请求太过频繁, 请 " + t.String() + " 秒后尝试")
+				}
+			} else {
+				return global.GVA_REDIS.Incr(context.Background(), key).Err()
+			}
+		}
+	}
+}