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78 lines
1.7 KiB
78 lines
1.7 KiB
package tools
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import (
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"log"
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"sync"
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"time"
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)
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type LimitQueeMap struct {
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sync.RWMutex
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LimitQueue map[string][]int64
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}
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func (l *LimitQueeMap) readMap(key string) ([]int64, bool) {
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l.RLock()
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value, ok := l.LimitQueue[key]
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l.RUnlock()
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return value, ok
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}
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func (l *LimitQueeMap) writeMap(key string, value []int64) {
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l.Lock()
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l.LimitQueue[key] = value
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l.Unlock()
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}
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var LimitQueue = &LimitQueeMap{
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LimitQueue: make(map[string][]int64),
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}
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var ok bool
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func NewLimitQueue() {
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cleanLimitQueue()
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}
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func cleanLimitQueue() {
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go func() {
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for {
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log.Println("cleanLimitQueue start...")
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LimitQueue.LimitQueue = nil
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now := time.Now()
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// 计算下一个零点
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next := now.Add(time.Hour * 24)
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next = time.Date(next.Year(), next.Month(), next.Day(), 0, 0, 0, 0, next.Location())
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t := time.NewTimer(next.Sub(now))
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<-t.C
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}
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}()
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}
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//单机时间滑动窗口限流法
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func LimitFreqSingle(queueName string, count uint, timeWindow int64) bool {
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currTime := time.Now().Unix()
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if LimitQueue.LimitQueue == nil {
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LimitQueue.LimitQueue = make(map[string][]int64)
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}
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if _, ok = LimitQueue.readMap(queueName); !ok {
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LimitQueue.writeMap(queueName, make([]int64, 0))
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return true
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}
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q, _ := LimitQueue.readMap(queueName)
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//队列未满
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if uint(len(q)) < count {
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LimitQueue.writeMap(queueName, append(q, currTime))
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return true
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}
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//队列满了,取出最早访问的时间
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earlyTime := q[0]
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//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
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if currTime-earlyTime <= timeWindow {
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return false
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} else {
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//说明最早期的访问应该过期了,去掉最早期的
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q = q[1:]
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LimitQueue.writeMap(queueName, append(q, currTime))
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}
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return true
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}
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