getMyPublicIP.py

#!/usr/bin/python

import urllib2
import threading
import re
import Queue
import sys


# The fourth URL returns a 403 error which python dies on, so I wrap this grab_ip function with exception handling.
# This function (and thereby thread) only acts if it sees a HTTP 200 return code.
# The regex for onlyIP grabs all of the IP addresses in the HTTP response and I just return the first IP in that list (which should be the right IP).
# And this function puts this IP address onto the ip_queue that was passed to it which is a clean asynchronous signalling mechanism for the main thread.

def grab_ip(url, ip_queue):
  try:
    urlResource = urllib2.urlopen(url)
    if urlResource.getcode() == 200:
      data = urlResource.read()
      onlyIP = re.findall(r'[0-9]+(?:\.[0-9]+){3}',data)
      ip_queue.put(onlyIP[0])
  except:
    pass


# I did not know about Python's Queue module before this, but it is awesome.  Highly functional asynchronous data tool.  Awesome.  And core python!

ip_queue = Queue.Queue()


# In retrospect, I really should have just had a variable that was parsed by a simple for loop, but here are the threads all spelled out.

first = threading.Thread(target=grab_ip, args=("http://checkip.amazonaws.com/", ip_queue))
first.daemon = True
first.start()

second = threading.Thread(target=grab_ip, args=("http://checkip.dyndns.org/", ip_queue))
second.daemon = True
second.start()

third = threading.Thread(target=grab_ip, args=("http://ifconfig.me/ip", ip_queue))
third.daemon = True
third.start()

fourth = threading.Thread(target=grab_ip, args=("http://corz.org/ip/", ip_queue))
fourth.daemon = True
fourth.start()

# These two queue get requests basically wait for the threads above to return results and then I move the main thread to conclusion.

firstIP =  ip_queue.get()
secondIP =  ip_queue.get()

# I am assuming these IP addresses are the same for the sake of this problem, but who knows, they could be different...

print firstIP

# Lets go ahead and quit as soon as we've printed the IP to the command line

sys.exit(0)