func LimitFreqs(queueName string, count uint, timeWindow int64) bool {
 currTime := time.Now().Unix()
 length := uint(ListLen(queueName))
 if length < count {
  ListPush(queueName, currTime)
  return true
 }
 //队列满了,取出最早访问的时间
 earlyTime, _ := strconv.ParseInt(ListIndex(queueName, int64(length)-1), 10, 64)
 //说明最早期的时间还在时间窗口内,还没过期,所以不允许通过
 if currTime-earlyTime <= timeWindow {
  return false
 } else {
  //说明最早期的访问应该过期了,去掉最早期的
  ListPop(queueName)
  ListPush(queueName, currTime)
 }
 return true
}

package redis

import (
  "context"
  "github.com/go-redis/redis/v8"
  "github.com/taoshihan1991/miaosha/setting"
  "log"
  "sync"
  "time"
)

var rdb *redis.Client
var ctx = context.Background()
var mutex sync.Mutex

func NewRedis() {
  rdb = redis.NewClient(&redis.Options{
    Addr:   setting.Redis.Ip + ":" + setting.Redis.Port,
    Password: "", // no password set
    DB:    0, // use default DB
  })
}
func Lock(key string) bool {
  mutex.Lock()
  defer mutex.Unlock()
  bool, err := rdb.SetNX(ctx, key, 1, 10*time.Second).Result()
  if err != nil {
    log.Println(err.Error())
  }
  return bool
}
func UnLock(key string) int64 {
  nums, err := rdb.Del(ctx, key).Result()
  if err != nil {
    log.Println(err.Error())
    return 0
  }
  return nums
}