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#!/usr/bin/env python
import memcache
import time
import re

'''
on local side, pls add cronjob. 
be noticed that the url is formatted. you may specify your own cgi path.

*/30 * * * * curl -s DOMAIN.com/1p/`curl -s ifconfig.me/ip` >/dev/null

'''

def timestr():
	return time.strftime('%Y-%m-%d %X')

def validateIP(ip):
	return re.match(r'^(?:\d{1,3}\.){3}\d{1,3}', ip)

class IP(object):
	def __init__(self):
		self.mc = memcache.Client(['127.0.0.1:11211'])
	
	def get(self):
		return (self.mc.get('ip'), self.mc.get('touched'), self.mc.get('updated'))

	def set(self, ip):
 		(i, t, u)=self.get()
		self._update_touched_time()
		if ip!=i and validateIP(ip):
			self._update_updated_time()
			self.mc.set('ip', ip)

	def _update_touched_time(self):
		self.mc.set('touched', timestr())

	def _update_updated_time(self):
		self.mc.set('updated', timestr())

def get_v(p, regex=None):
    """return cgi GET parameter; strip white spaces at both ends if any;
    if verify pattern provided, do match test; only return matched values.
    Note: it uses re.match to check , not re.search.
    """
    import cgi
    form = cgi.FieldStorage()
    value= form.getfirst(p)

    if not value:
        return None
    value=value.strip()

    if regex is not None:
        import re
        if re.match(regex+"$",value):
            return value
        else:
            return None
    else:
         return value

def main():
	print "content-type: text/plain\n"
	i=IP()
	ip=get_v("ip")
	full=get_v('full')
	
	if ip:
		i.set(ip)
	if full:
		info=i.get()
		head=('IP', 'Touched', 'Updated')
		ret=zip(head, info)
		for r in ret:
			print "%s:\t%s" % (r[0], r[1])
	else:
		print i.get()[0]
	

if __name__=='__main__'	:
	main()