mirror of
https://github.com/TeaOSLab/EdgeNode.git
synced 2025-11-04 16:00:25 +08:00
98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
package utils
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import (
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teaconst "github.com/TeaOSLab/EdgeNode/internal/const"
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"github.com/TeaOSLab/EdgeNode/internal/re"
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"github.com/TeaOSLab/EdgeNode/internal/ttlcache"
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"github.com/TeaOSLab/EdgeNode/internal/utils/cachehits"
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"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
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"github.com/cespare/xxhash"
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"strconv"
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)
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var cache = ttlcache.NewCache[int8]()
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var cacheHits *cachehits.Stat
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func init() {
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if !teaconst.IsMain {
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return
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}
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cacheHits = cachehits.NewStat(5)
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}
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const (
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maxCacheDataSize = 1024
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)
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type CacheLife = int64
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const (
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CacheDisabled CacheLife = 0
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CacheShortLife CacheLife = 600
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CacheMiddleLife CacheLife = 1800
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CacheLongLife CacheLife = 7200
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)
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// MatchStringCache 正则表达式匹配字符串，并缓存结果
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func MatchStringCache(regex *re.Regexp, s string, cacheLife CacheLife) bool {
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if regex == nil {
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return false
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}
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var regIdString = regex.IdString()
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// 如果长度超过一定数量，大概率是不能重用的
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if cacheLife <= 0 || len(s) > maxCacheDataSize || !cacheHits.IsGood(regIdString) {
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return regex.MatchString(s)
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}
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var hash = xxhash.Sum64String(s)
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var key = regIdString + "@" + strconv.FormatUint(hash, 10)
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var item = cache.Read(key)
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if item != nil {
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cacheHits.IncreaseHit(regIdString)
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return item.Value == 1
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}
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var b = regex.MatchString(s)
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if b {
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cache.Write(key, 1, fasttime.Now().Unix()+cacheLife)
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} else {
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cache.Write(key, 0, fasttime.Now().Unix()+cacheLife)
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}
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cacheHits.IncreaseCached(regIdString)
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return b
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}
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// MatchBytesCache 正则表达式匹配字节slice，并缓存结果
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func MatchBytesCache(regex *re.Regexp, byteSlice []byte, cacheLife CacheLife) bool {
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if regex == nil {
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return false
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}
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var regIdString = regex.IdString()
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// 如果长度超过一定数量，大概率是不能重用的
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if cacheLife <= 0 || len(byteSlice) > maxCacheDataSize || !cacheHits.IsGood(regIdString) {
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return regex.Match(byteSlice)
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}
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var hash = xxhash.Sum64(byteSlice)
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var key = regIdString + "@" + strconv.FormatUint(hash, 10)
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var item = cache.Read(key)
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if item != nil {
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cacheHits.IncreaseHit(regIdString)
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return item.Value == 1
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}
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if item != nil {
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return item.Value == 1
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}
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var b = regex.Match(byteSlice)
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if b {
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cache.Write(key, 1, fasttime.Now().Unix()+cacheLife)
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} else {
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cache.Write(key, 0, fasttime.Now().Unix()+cacheLife)
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}
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cacheHits.IncreaseCached(regIdString)
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return b
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}
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