mirror of
https://github.com/TeaOSLab/EdgeNode.git
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57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package utils
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import (
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"fmt"
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"github.com/TeaOSLab/EdgeNode/internal/grids"
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"github.com/TeaOSLab/EdgeNode/internal/utils"
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"github.com/dchest/siphash"
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"regexp"
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"strconv"
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)
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var grid = grids.NewGrid(32, grids.NewLimitCountOpt(1000_0000))
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// 正则表达式匹配字符串，并缓存结果
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func MatchStringCache(regex *regexp.Regexp, s string) bool {
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// 如果长度超过4096，大概率是不能重用的
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if len(s) > 4096 {
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return regex.MatchString(s)
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}
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hash := siphash.Hash(0, 0, utils.UnsafeStringToBytes(s))
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key := []byte(fmt.Sprintf("%p_", regex) + strconv.FormatUint(hash, 10))
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item := grid.Read(key)
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if item != nil {
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return item.ValueInt64 == 1
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}
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b := regex.MatchString(s)
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if b {
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grid.WriteInt64(key, 1, 1800)
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} else {
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grid.WriteInt64(key, 0, 1800)
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}
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return b
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}
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// 正则表达式匹配字节slice，并缓存结果
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func MatchBytesCache(regex *regexp.Regexp, byteSlice []byte) bool {
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// 如果长度超过4096，大概率是不能重用的
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if len(byteSlice) > 4096 {
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return regex.Match(byteSlice)
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}
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hash := siphash.Hash(0, 0, byteSlice)
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key := []byte(fmt.Sprintf("%p_", regex) + strconv.FormatUint(hash, 10))
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item := grid.Read(key)
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if item != nil {
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return item.ValueInt64 == 1
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}
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b := regex.Match(byteSlice)
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if b {
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grid.WriteInt64(key, 1, 1800)
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} else {
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grid.WriteInt64(key, 0, 1800)
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}
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return b
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}
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