mirror of
https://github.com/TeaOSLab/EdgeAPI.git
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131 lines
2.6 KiB
Go
131 lines
2.6 KiB
Go
// 源码改自：https://github.com/lionsoul2014/ip2region/blob/master/binding/golang/ip2region/ip2Region.go
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package iplibrary
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import (
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"errors"
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"io/ioutil"
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"strconv"
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"strings"
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)
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const (
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IndexBlockLength = 12
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)
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var err error
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type IP2Region struct {
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headerSip []int64
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headerPtr []int64
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headerLen int64
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// super block index info
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firstIndexPtr int64
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lastIndexPtr int64
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totalBlocks int64
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dbData []byte
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}
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type IpInfo struct {
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CityId int64
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Country string
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Region string
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Province string
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City string
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ISP string
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}
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func (ip IpInfo) String() string {
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return strconv.FormatInt(ip.CityId, 10) + "|" + ip.Country + "|" + ip.Region + "|" + ip.Province + "|" + ip.City + "|" + ip.ISP
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}
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func getIpInfo(cityId int64, line []byte) *IpInfo {
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lineSlice := strings.Split(string(line), "|")
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ipInfo := &IpInfo{}
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length := len(lineSlice)
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ipInfo.CityId = cityId
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if length < 5 {
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for i := 0; i <= 5-length; i++ {
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lineSlice = append(lineSlice, "")
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}
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}
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ipInfo.Country = lineSlice[0]
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ipInfo.Region = lineSlice[1]
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ipInfo.Province = lineSlice[2]
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ipInfo.City = lineSlice[3]
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ipInfo.ISP = lineSlice[4]
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return ipInfo
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}
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func NewIP2Region(path string) (*IP2Region, error) {
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var region = &IP2Region{}
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region.dbData, err = ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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region.firstIndexPtr = region.ipLongAtOffset(0)
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region.lastIndexPtr = region.ipLongAtOffset(4)
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region.totalBlocks = (region.lastIndexPtr-region.firstIndexPtr)/IndexBlockLength + 1
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return region, nil
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}
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func (this *IP2Region) MemorySearch(ipStr string) (ipInfo *IpInfo, err error) {
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ip, err := ip2long(ipStr)
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if err != nil {
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return nil, err
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}
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h := this.totalBlocks
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var dataPtr, l int64
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for l <= h {
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m := (l + h) >> 1
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p := this.firstIndexPtr + m*IndexBlockLength
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sip := this.ipLongAtOffset(p)
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if ip < sip {
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h = m - 1
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} else {
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eip := this.ipLongAtOffset(p + 4)
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if ip > eip {
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l = m + 1
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} else {
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dataPtr = this.ipLongAtOffset(p + 8)
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break
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}
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}
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}
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if dataPtr == 0 {
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return nil, nil
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}
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dataLen := (dataPtr >> 24) & 0xFF
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dataPtr = dataPtr & 0x00FFFFFF
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return getIpInfo(this.ipLongAtOffset(dataPtr), this.dbData[(dataPtr)+4:dataPtr+dataLen]), nil
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}
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func (this *IP2Region) ipLongAtOffset(offset int64) int64 {
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return int64(this.dbData[offset]) |
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int64(this.dbData[offset+1])<<8 |
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int64(this.dbData[offset+2])<<16 |
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int64(this.dbData[offset+3])<<24
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}
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func ip2long(IpStr string) (int64, error) {
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bits := strings.Split(IpStr, ".")
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if len(bits) != 4 {
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return 0, errors.New("ip format error")
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}
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var sum int64
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for i, n := range bits {
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bit, _ := strconv.ParseInt(n, 10, 64)
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sum += bit << uint(24-8*i)
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}
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return sum, nil
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}
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