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ip2Region.py
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ip2Region.py
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# -*- coding:utf-8 -*-
"""
" ip2region python seacher client module
"
" Author: koma<komazhang@foxmail.com>
" Date : 2015-11-06
"""
import struct, io, socket, sys
class Ip2Region(object):
__INDEX_BLOCK_LENGTH = 12
__TOTAL_HEADER_LENGTH = 8192
__f = None
__headerSip = []
__headerPtr = []
__headerLen = 0
__indexSPtr = 0
__indexLPtr = 0
__indexCount = 0
__dbBinStr = ''
def __init__(self, dbfile):
self.initDatabase(dbfile)
def memorySearch(self, ip):
"""
" memory search method
" param: ip
"""
if not ip.isdigit(): ip = self.ip2long(ip)
if self.__dbBinStr == '':
self.__dbBinStr = self.__f.read() # read all the contents in file
self.__indexSPtr = self.getLong(self.__dbBinStr, 0)
self.__indexLPtr = self.getLong(self.__dbBinStr, 4)
self.__indexCount = int((self.__indexLPtr - self.__indexSPtr) / self.__INDEX_BLOCK_LENGTH) + 1
l, h, dataPtr = (0, self.__indexCount, 0)
while l <= h:
m = int((l + h) >> 1)
p = self.__indexSPtr + m * self.__INDEX_BLOCK_LENGTH
sip = self.getLong(self.__dbBinStr, p)
if ip < sip:
h = m - 1
else:
eip = self.getLong(self.__dbBinStr, p + 4)
if ip > eip:
l = m + 1;
else:
dataPtr = self.getLong(self.__dbBinStr, p + 8)
break
if dataPtr == 0: raise Exception("Data pointer not found")
return self.returnData(dataPtr)
def binarySearch(self, ip):
"""
" binary search method
" param: ip
"""
if not ip.isdigit(): ip = self.ip2long(ip)
if self.__indexCount == 0:
self.__f.seek(0)
superBlock = self.__f.read(8)
self.__indexSPtr = self.getLong(superBlock, 0)
self.__indexLPtr = self.getLong(superBlock, 4)
self.__indexCount = int((self.__indexLPtr - self.__indexSPtr) / self.__INDEX_BLOCK_LENGTH) + 1
l, h, dataPtr = (0, self.__indexCount, 0)
while l <= h:
m = int((l + h) >> 1)
p = m * self.__INDEX_BLOCK_LENGTH
self.__f.seek(self.__indexSPtr + p)
buffer = self.__f.read(self.__INDEX_BLOCK_LENGTH)
sip = self.getLong(buffer, 0)
if ip < sip:
h = m - 1
else:
eip = self.getLong(buffer, 4)
if ip > eip:
l = m + 1
else:
dataPtr = self.getLong(buffer, 8)
break
if dataPtr == 0: raise Exception("Data pointer not found")
return self.returnData(dataPtr)
def btreeSearch(self, ip):
"""
" b-tree search method
" param: ip
"""
if not ip.isdigit(): ip = self.ip2long(ip)
if len(self.__headerSip) < 1:
headerLen = 0
# pass the super block
self.__f.seek(8)
# read the header block
b = self.__f.read(self.__TOTAL_HEADER_LENGTH)
# parse the header block
for i in range(0, len(b), 8):
sip = self.getLong(b, i)
ptr = self.getLong(b, i + 4)
if ptr == 0:
break
self.__headerSip.append(sip)
self.__headerPtr.append(ptr)
headerLen += 1
self.__headerLen = headerLen
l, h, sptr, eptr = (0, self.__headerLen, 0, 0)
while l <= h:
m = int((l + h) >> 1)
if ip == self.__headerSip[m]:
if m > 0:
sptr = self.__headerPtr[m - 1]
eptr = self.__headerPtr[m]
else:
sptr = self.__headerPtr[m]
eptr = self.__headerPtr[m + 1]
break
if ip < self.__headerSip[m]:
if m == 0:
sptr = self.__headerPtr[m]
eptr = self.__headerPtr[m + 1]
break
elif ip > self.__headerSip[m - 1]:
sptr = self.__headerPtr[m - 1]
eptr = self.__headerPtr[m]
break
h = m - 1
else:
if m == self.__headerLen - 1:
sptr = self.__headerPtr[m - 1]
eptr = self.__headerPtr[m]
break
elif ip <= self.__headerSip[m + 1]:
sptr = self.__headerPtr[m]
eptr = self.__headerPtr[m + 1]
break
l = m + 1
if sptr == 0: raise Exception("Index pointer not found")
indexLen = eptr - sptr
self.__f.seek(sptr)
index = self.__f.read(indexLen + self.__INDEX_BLOCK_LENGTH)
l, h, dataPrt = (0, int(indexLen / self.__INDEX_BLOCK_LENGTH), 0)
while l <= h:
m = int((l + h) >> 1)
offset = int(m * self.__INDEX_BLOCK_LENGTH)
sip = self.getLong(index, offset)
if ip < sip:
h = m - 1
else:
eip = self.getLong(index, offset + 4)
if ip > eip:
l = m + 1;
else:
dataPrt = self.getLong(index, offset + 8)
break
if dataPrt == 0: raise Exception("Data pointer not found")
return self.returnData(dataPrt)
def initDatabase(self, dbfile):
"""
" initialize the database for search
" param: dbFile
"""
try:
self.__f = io.open(dbfile, "rb")
except IOError as e:
print("[Error]: %s" % e)
sys.exit()
def returnData(self, dataPtr):
"""
" get ip data from db file by data start ptr
" param: dsptr
"""
dataLen = (dataPtr >> 24) & 0xFF
dataPtr = dataPtr & 0x00FFFFFF
self.__f.seek(dataPtr)
data = self.__f.read(dataLen)
return {
"city_id": self.getLong(data, 0),
"region": data[4:]
}
def ip2long(self, ip):
_ip = socket.inet_aton(ip)
return struct.unpack("!L", _ip)[0]
def isip(self, ip):
p = ip.split(".")
if len(p) != 4: return False
for pp in p:
if not pp.isdigit(): return False
if len(pp) > 3: return False
if int(pp) > 255: return False
return True
def getLong(self, b, offset):
if len(b[offset:offset + 4]) == 4:
return struct.unpack('I', b[offset:offset + 4])[0]
return 0
def close(self):
if self.__f != None:
self.__f.close()
self.__dbBinStr = None
self.__headerPtr = None
self.__headerSip = None