Playing with Python and GeoIP in Debian
Wednesday, October 14, 2009 - 63 commentsYep, I know, in the previous post I said that I'd try to write more often and in small chunks but looks like it's not working...
By the way, today I needed to find out the origin country of an hostname (actually a list of hostnames). As Debian has a GeoIP database available via aptitude, I could accomplish that using this database and the Python's GeoIP module.
First of all I installed the necessary packages
merlin:~# aptitude install geoip-database python-geoip
And then I wrote the following small script that configure the Python's GeoIP module to use the Debian's GeoIP database:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import re
import sys
import GeoIP
# oops, check the usage! :)
if len(sys.argv) != 2:
print 'Usage: %s ADDRESS' % sys.argv[0]
sys.exit(1)
# geoip database from "geoip-database" debian package
GEOIP_DATABASE = '/usr/share/GeoIP/GeoIP.dat'
geoip = GeoIP.open(GEOIP_DATABASE, GeoIP.GEOIP_STANDARD)
# get the country name based in the given input
if re.match('^[0-9]{1,3}(\.[0-9]{1,3}){3}$', sys.argv[1]):
response = geoip.country_name_by_addr(sys.argv[1])
else:
response = geoip.country_name_by_name(sys.argv[1])
# print the response if there is any response
if response:
print response
Some tests to check if it is really working... and it looks like it is. :)
afurlan@merlin:~$ ./hostname_country.py afurlan.org
United States
afurlan@merlin:~$ ./hostname_country.py mandriva.com
France
afurlan@merlin:~$ ./hostname_country.py debian.com
Netherlands
afurlan@merlin:~$ ./hostname_country.py mps.com.br
Brazil
afurlan@merlin:~$ ./hostname_country.py some-nonexistent-domain.org
afurlan@merlin:~$
I think that's all...
Update: I changed the code based on the Bogdano's comment, thanks Bogdano. :)
And, please, never forget: if you found some english bug, warn me and I'll be glad to fix it. :)
>>> a = 2
>>> b = 2
>>> c = range(0, 2)
>>> id(a)
145727276
>>> id(b)
145727276
>>> id(len(c))
145727276
>>> help(id)
Help on built-in function id in module __builtin__:
id(...)
id(object) -> integer
Return the identity of an object. This is guaranteed to be unique among
simultaneously existing objects. (Hint: it's the object's memory address.)
>>>
>>> id(0 + 257)
136353172
>>> id(257)
136353232
O ponto é que um programa tão simples está apoiado em um recurso que é dependente de implementação.
IronPython 1.1.1 (1.1.1) on .NET 2.0.50727.1433
Copyright (c) Microsoft Corporation. All rights reserved.
>>> id(2)
43L
>>> id(2)
44L
In the case of the program above, this behaviour should not affect and/or break the code, but you're right about keeping an implementation-dependent feature. I changed the code and switched the "is" by a "!=" operator.
Thanks for the advice. :)
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