优化IP名单同步速度

internal/firewalls/nftables/expration.go

@@ -0,0 +1,62 @@
+// Copyright 2023 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package nftables
+
+import (
+	"sync"
+	"time"
+)
+
+type Expiration struct {
+	m map[string]time.Time // key => expires time
+
+	lastGCAt int64
+
+	locker sync.RWMutex
+}
+
+func NewExpiration() *Expiration {
+	return &Expiration{
+		m: map[string]time.Time{},
+	}
+}
+
+func (this *Expiration) AddUnsafe(key []byte, expires time.Time) {
+	this.m[string(key)] = expires
+}
+
+func (this *Expiration) Add(key []byte, expires time.Time) {
+	this.locker.Lock()
+	this.m[string(key)] = expires
+	this.gc()
+	this.locker.Unlock()
+}
+
+func (this *Expiration) Remove(key []byte) {
+	this.locker.Lock()
+	delete(this.m, string(key))
+	this.locker.Unlock()
+}
+
+func (this *Expiration) Contains(key []byte) bool {
+	this.locker.RLock()
+	_, ok := this.m[string(key)]
+	this.locker.RUnlock()
+	return ok
+}
+
+func (this *Expiration) gc() {
+	// we won't gc too frequently
+	var currentTime = time.Now().Unix()
+	if this.lastGCAt >= currentTime {
+		return
+	}
+	this.lastGCAt = currentTime
+
+	var now = time.Now().Add(-10 * time.Second) // gc elements expired before 10 seconds ago
+	for key, expires := range this.m {
+		if expires.Year() >= 2000 && now.After(expires) {
+			delete(this.m, key)
+		}
+	}
+}