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ip2Region.go
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ip2Region.go
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package ip2region
import (
"os"
"strings"
"strconv"
"io/ioutil"
"errors"
)
const (
INDEX_BLOCK_LENGTH = 12
TOTAL_HEADER_LENGTH = 8192
)
var err error
var ipInfo IpInfo
type Ip2Region struct {
// db file handler
dbFileHandler *os.File
//header block info
headerSip []int64
headerPtr []int64
headerLen int64
// super block index info
firstIndexPtr int64
lastIndexPtr int64
totalBlocks int64
// for memory mode only
// the original db binary string
dbBinStr []byte
dbFile string
}
type IpInfo struct {
CityId int64
Country string
Region string
Province string
City string
ISP string
}
func (ip IpInfo)String() string {
return strconv.FormatInt(ip.CityId, 10) + "|" + ip.Country + "|" + ip.Region + "|" + ip.Province + "|" + ip.City + "|" + ip.ISP
}
func getIpInfo(cityId int64, line []byte) IpInfo {
lineSlice := strings.Split(string(line), "|")
ipInfo := IpInfo{}
length := len(lineSlice)
ipInfo.CityId = cityId
if length < 5 {
for i := 0; i <= 5 - length; i++ {
lineSlice = append(lineSlice, "")
}
}
ipInfo.Country = lineSlice[0]
ipInfo.Region = lineSlice[1]
ipInfo.Province = lineSlice[2]
ipInfo.City = lineSlice[3]
ipInfo.ISP = lineSlice[4]
return ipInfo
}
func New(path string) (*Ip2Region, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
return &Ip2Region{
dbFile:path,
dbFileHandler:file,
}, nil
}
func (this *Ip2Region) Close() {
this.dbFileHandler.Close()
}
func (this *Ip2Region) MemorySearch(ipStr string) (ipInfo IpInfo, err error) {
ipInfo = IpInfo{}
if this.totalBlocks == 0 {
this.dbBinStr, err = ioutil.ReadFile(this.dbFile)
if err != nil {
return ipInfo, err
}
this.firstIndexPtr = getLong(this.dbBinStr, 0)
this.lastIndexPtr = getLong(this.dbBinStr, 4)
this.totalBlocks = (this.lastIndexPtr - this.firstIndexPtr) / INDEX_BLOCK_LENGTH + 1
}
ip, err := ip2long(ipStr)
if err != nil {
return ipInfo, err
}
h := this.totalBlocks
var dataPtr, l int64;
for (l <= h) {
m := (l + h) >> 1
p := this.firstIndexPtr + m * INDEX_BLOCK_LENGTH
sip := getLong(this.dbBinStr, p)
if ip < sip {
h = m - 1
} else {
eip := getLong(this.dbBinStr, p + 4)
if ip > eip {
l = m + 1
} else {
dataPtr = getLong(this.dbBinStr, p + 8)
break;
}
}
}
if dataPtr == 0 {
return ipInfo, errors.New("not found")
}
dataLen := ((dataPtr >> 24) & 0xFF)
dataPtr = (dataPtr & 0x00FFFFFF);
ipInfo = getIpInfo(getLong(this.dbBinStr, dataPtr), this.dbBinStr[(dataPtr) + 4:dataPtr + dataLen])
return ipInfo, nil
}
func (this *Ip2Region)BinarySearch(ipStr string) (ipInfo IpInfo, err error) {
ipInfo = IpInfo{}
if this.totalBlocks == 0 {
this.dbFileHandler.Seek(0, 0)
superBlock := make([]byte, 8)
this.dbFileHandler.Read(superBlock)
this.firstIndexPtr = getLong(superBlock, 0)
this.lastIndexPtr = getLong(superBlock, 4)
this.totalBlocks = (this.lastIndexPtr - this.firstIndexPtr) / INDEX_BLOCK_LENGTH + 1
}
var l, dataPtr, p int64
h := this.totalBlocks
ip, err := ip2long(ipStr)
if err != nil {
return
}
for (l <= h) {
m := (l + h) >> 1
p = m * INDEX_BLOCK_LENGTH
_, err = this.dbFileHandler.Seek(this.firstIndexPtr + p, 0)
if err != nil {
return
}
buffer := make([]byte, INDEX_BLOCK_LENGTH)
_, err = this.dbFileHandler.Read(buffer)
if err != nil {
}
sip := getLong(buffer, 0)
if ip < sip {
h = m - 1
} else {
eip := getLong(buffer, 4)
if ip > eip {
l = m + 1
} else {
dataPtr = getLong(buffer, 8)
break;
}
}
}
if dataPtr == 0 {
err = errors.New("not found")
return
}
dataLen := ((dataPtr >> 24) & 0xFF)
dataPtr = (dataPtr & 0x00FFFFFF);
this.dbFileHandler.Seek(dataPtr, 0)
data := make([]byte, dataLen)
this.dbFileHandler.Read(data)
ipInfo = getIpInfo(getLong(data, 0), data[4:dataLen])
err = nil
return
}
func (this *Ip2Region) BtreeSearch(ipStr string) (ipInfo IpInfo, err error) {
ipInfo = IpInfo{}
ip, err := ip2long(ipStr)
if this.headerLen == 0 {
this.dbFileHandler.Seek(8, 0)
buffer := make([]byte, TOTAL_HEADER_LENGTH)
this.dbFileHandler.Read(buffer)
var idx int64;
for i := 0; i < TOTAL_HEADER_LENGTH; i += 8 {
startIp := getLong(buffer, int64(i))
dataPar := getLong(buffer, int64(i + 4))
if dataPar == 0 {
break
}
this.headerSip = append(this.headerSip, startIp)
this.headerPtr = append(this.headerPtr, dataPar)
idx ++;
}
this.headerLen = idx
}
var l, sptr, eptr int64
h := this.headerLen
for l <= h {
m := int64(l + h) >> 1
if m < this.headerLen {
if ip == this.headerSip[m] {
if m > 0 {
sptr = this.headerPtr[m - 1]
eptr = this.headerPtr[m]
} else {
sptr = this.headerPtr[m]
eptr = this.headerPtr[m + 1]
}
break
}
if ip < this.headerSip[m] {
if m == 0 {
sptr = this.headerPtr[m]
eptr = this.headerPtr[m + 1]
break
} else if ip > this.headerSip[m - 1] {
sptr = this.headerPtr[m - 1]
eptr = this.headerPtr[m]
break
}
h = m - 1
} else {
if m == this.headerLen - 1 {
sptr = this.headerPtr[m - 1]
eptr = this.headerPtr[m]
break
} else if ip <= this.headerSip[m + 1] {
sptr = this.headerPtr[m ]
eptr = this.headerPtr[m + 1]
break
}
l = m + 1
}
}
}
if sptr == 0 {
err = errors.New("not found")
return
}
blockLen := eptr - sptr
this.dbFileHandler.Seek(sptr, 0)
index := make([]byte, blockLen + INDEX_BLOCK_LENGTH)
this.dbFileHandler.Read(index)
var dataptr int64
h = blockLen / INDEX_BLOCK_LENGTH
l = 0
for l <= h {
m := int64(l + h) >> 1
p := m * INDEX_BLOCK_LENGTH
sip := getLong(index, p)
if ip < sip {
h = m - 1;
} else {
eip := getLong(index, p + 4)
if ip > eip {
l = m + 1
} else {
dataptr = getLong(index, p + 8)
break
}
}
}
if dataptr == 0 {
err = errors.New("not found")
return
}
dataLen := (dataptr >> 24) & 0xFF
dataPtr := dataptr & 0x00FFFFFF
this.dbFileHandler.Seek(dataPtr, 0)
data := make([]byte, dataLen)
this.dbFileHandler.Read(data)
ipInfo = getIpInfo(getLong(data, 0), data[4:])
return
}
func getLong(b []byte, offset int64) int64 {
val := (int64(b[offset ]) |
int64(b[offset + 1]) << 8 |
int64(b[offset + 2]) << 16 |
int64(b[offset + 3]) << 24)
return val
}
func ip2long(IpStr string) (int64, error) {
bits := strings.Split(IpStr, ".")
if len(bits) != 4 {
return 0, errors.New("ip format error")
}
var sum int64
for i, n := range bits {
bit, _ := strconv.ParseInt(n, 10, 64)
sum += bit << uint(24 - 8 * i)
}
return sum, nil
}