Ruby gem geoip and Rack::GeoIPCountry

Samson Wu — Thu, 25 Feb 2010 08:51:44 +0000

wikipedia上对于geolocation的解释是这样的：

Geolocation is the identification of the real-world geographic location of an Internet-connected computer, mobile device, website visitor or other.

检测的方法貌似也有很多：

Geolocation can be performed by associating a geographic location with the Internet Protocol (IP) address, MAC address, RFID, hardware embedded article/production number, embedded software number (such as UUID, Exif/IPTC/XMP or modern steganography), invoice, Wi-Fi connection location, or device GPS coordinates, or other, perhaps self-disclosed information.

（班门弄斧一下先，呵呵呵呵）

ruby里面取到geo信息的一个相对方便的办法是使用rubygem geoip，虽然本质上还是使用maxmind的data，但是免去了编译和安装其c library的麻烦。

安装gem并下载其depend到的geoip database：

$ sudo gem install geoip

$ wget http://geolite.maxmind.com/download/geoip/database/GeoLiteCountry/GeoIP.dat.gz && gunzip GeoIP.dat.gz

如果想要城市信息，还可以下载稍微大一点的带city info的free database：

$ wget http://geolite.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz && gunzip GeoLiteCity.dat.gz

简单的测试一下：

require 'rubygems'
require 'geoip'

p GeoIP.new('GeoIP.dat').country("google.com")
p GeoIP.new('GeoLiteCity.dat').city("baidu.com")

alright, looks good:

["google.com", "66.249.91.104", 225, "US", "USA", "United States", "NA"]
["baidu.com", "220.181.6.81", "CN", "CHN", "China", "AS", "22", "Beijing", "", 39.9289, 116.3883]

由于geo的普遍性，把其做成可以plug&play的Rack middleware绝对是个好主意，这就是接下来要介绍的Rack::GeoIPCountry，CodeRack Contest的first place。

其原理就是调用geoip gem获得访问IP的geo信息并写入request header，这样后面的app或者middleware就能读到并处理了。

同样写个简单的middleware测试一下：

require 'geo_ip_country'

class GeoTest
def initialize(app)
@app = app
end

def call(env)
puts "Remote Address: #{env['REMOTE_ADDR']}"
puts "GeoIP Country ID: #{env['X_GEOIP_COUNTRY_ID']}"
puts "GeoIP Country Code: #{env['X_GEOIP_COUNTRY_CODE']}"
puts "GeoIP Country Code3: #{env['X_GEOIP_COUNTRY_CODE3']}"
puts "GeoIP Country: #{env['X_GEOIP_COUNTRY']}"
puts "GeoIP Continent: #{env['X_GEOIP_CONTINENT']}"
@app.call(env)
end
end

use Rack::ContentLength
use Rack::GeoIPCountry
use GeoTest

run Proc.new { |env| [200, { 'Content-Type' => 'text/html' }, 'OK'] }

rackup起来后，访问http://localhost:9292，确认console下输出了我们想要的geo信息：

Remote Address: 127.0.0.1
GeoIP Country ID: 0
GeoIP Country Code: --
GeoIP Country Code3: --
GeoIP Country: N/A
GeoIP Continent: --
127.0.0.1 - - [25/Feb/2010 16:36:11] "GET / HTTP/1.1" 200 2 0.0016

当然上面的127.0.0.1是不会有任何信息的，local network也是不会在database里面找到对应的，只有当真正的外网ip hit到我们的server时，我们才能看到有意义的geo信息。

Samson's Weblog » geo

Ruby gem geoip and Rack::GeoIPCountry

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