qqzeng-ip.dat是一個特殊格式的dat文件，可以快速的查找IP對應的地理位置信息。據作者測試的結果來看，是100萬ip查找速度0.5秒。

當然這和語言有非常大的關系，python的循環性能一直是為人所詬病的。目前python版本測試的結果是10萬IP的查找速度是3.X秒左右，還算夠用，畢竟真實情況下的30秒~5分鐘內的日志不太可能出現一批數據中的不重復IP超過10萬個。

作者提供了解析dat的java/c/php腳本，但沒有提供python版本的。所以我就寫了一個，以供需要用python語言讀取ip的地理位置信息使用。

代碼如下：

#coding:utf-8

import os

import math

import socket

import struct

import io

from io import SEEK_SET

path = os.path.normpath(os.path.dirname(os.path.abspath(__file__)) + "/qqzeng-ip-utf8.dat")

class IpSearch(object):

fp = None

firstStartIpOffset = None

lastStartIpOffset = None

preStartOffset = None

preEndOffset = None

ipCount = None

prefixCount = None

prefixList = dict()

def __init__(self):

self.fp = io.open(path,"rb")

buff = self.fp.read(16)

self.firstStartIpOffset = self.bytesToLong(buff[0],buff[1],buff[2],buff[3])

self.lastStartIpOffset = self.bytesToLong(buff[4],buff[5],buff[6],buff[7])

self.preStartOffset = self.bytesToLong(buff[8],buff[9],buff[10],buff[11])

self.preEndOffset = self.bytesToLong(buff[12],buff[13],buff[14],buff[15])

self.ipCount = (self.lastStartIpOffset - self.firstStartIpOffset) / 12 + 1

self.prefixCount = (self.preEndOffset - self.preStartOffset) / 9 + 1

self.fp.seek(self.preStartOffset,SEEK_SET)

preBuff = self.fp.read(self.prefixCount*9)

for k in range(0,self.prefixCount):

i = k*9

startIndex = self.bytesToLong(preBuff[1+i],preBuff[2+i],preBuff[3+i],preBuff[4+i])

endIndex = self.bytesToLong(preBuff[5+i],preBuff[6+i],preBuff[7+i],preBuff[8+i])

self.prefixList[ord(preBuff[i])] = {

"start_index":startIndex,

"end_index":endIndex

}

def __del__(self):

if self.fp != None:

self.fp.close()

def get(self,ip):

if ip == '':

return ""

high = 0

low = 0

startIp = 0

endIp = 0

localOffset = 0

localLength = 0

prefix = ip.split(".")[0]

prefix = int(prefix)

ipnum = self.ip2unit(ip)

if prefix in self.prefixList.keys():

index = self.prefixList[prefix]

low = index["start_index"]

high = index["end_index"]

else:

return ""

left = low if low == high else self.binarySearch(low,high,ipnum)

left,startIp,endIp,localOffset,localLength = self.getIndex(left,startIp,endIp,localOffset,localLength)

if startIp <= ipnum and endIp >= ipnum:

return self.getLocal(localOffset,localLength)

else:

return ""

def getLocal(self,localOffset,localLength):

self.fp.seek(localOffset,SEEK_SET)

return self.fp.read(localLength)

def getIndex(self,left,startIp,endIp,localOffset,localLength):

leftOffset = self.firstStartIpOffset + left*12

self.fp.seek(leftOffset,SEEK_SET)

buff = self.fp.read(12)

startIp = self.bytesToLong(buff[0],buff[1],buff[2],buff[3])

endIp = self.bytesToLong(buff[4],buff[5],buff[6],buff[7])

r3 = (ord(buff[8]) << 0 | ord(buff[9]) << 8 | ord(buff[10]) << 16)

if r3 < 0:

r3 += 4294967296

localOffset = r3

localLength = ord(buff[11])

return [left,startIp,endIp,localOffset,localLength]

def binarySearch(self,low,high,k):

m = 0

while low <= high:

mid = (low + high)/2

endIpNum = self.getEndIpNum(mid)

if endIpNum >= k:

m = mid

if mid == 0:

break

high = mid - 1

else:

low = mid + 1

return m

def getEndIpNum(self,left):

leftOffset = self.firstStartIpOffset + (left*12) + 4

self.fp.seek(leftOffset,SEEK_SET)

buf = self.fp.read(4)

return self.bytesToLong(buf[0],buf[1],buf[2],buf[3])

def ip2unit(self,ip):

lip = self.ip2long(ip)

if lip < 0:

lip += 4294967296

return lip

def ip2long(self,ip):

packedIP = socket.inet_aton(ip)

return struct.unpack("!L", packedIP)[0]

def bytesToLong(self,a,b,c,d):

iplong = (ord(a) << 0) | (ord(b) << 8) | (ord(c) << 16) | (ord(d) << 24)

if iplong < 0:

iplong += 4294967296

return iplong

if __name__ == '__main__':

ipSearch = IpSearch()

print ipSearch.get("210.51.200.123").decode("utf-8").encode("gbk")

import time

startTime = time.time()

for i in range(0,100000):

ipSearch.get("210.51.200.123")

endTime = time.time()

print "time waste:",endTime-startTime

測試結果如下：

與百度查出的IP信息進行對比：

還挺不錯的，對吧。

總結

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