Scripts for website monitoring using Python

gistfile1.py

# Sample usage: "checksites.py eriwen.com nixtutor.com ..."

import pickle, os, sys, logging
from httplib import HTTPConnection
from smtplib import SMTP

def email_alert(alert,subject='You have an alert'):
    fromaddr = "[email protected]"
    toaddrs = "[email protected]"

    # Add the From: and To: headers at the start!
    msg = "From: %s\r\nSubject: %s\r\nTo: %s\r\n\r\n%s" % (fromaddr, subject, toaddrs, alert)

    server = smtplib.SMTP('localhost')
    server.sendmail(fromaddr, toaddrs, msg)
    server.quit()

def is_url_reachable(url):
	try:
		conn = HTTPConnection(url)
		conn.request("HEAD", "/")
		if conn.getresponse().status != 200:
			return False
		return True
	except: 
		logging.error('Bad URL:', url)
		raise
		
def get_headers(url):
	try:
		conn = HTTPConnection(url)
		conn.request("HEAD", "/")
		response = conn.getresponse()
		return response.getheaders()
	except: 
		logging.error('Bad URL:', url)
		raise

def is_internet_reachable():
	'''Checks Google then Yahoo just in case one is down'''
	if not is_url_reachable('www.google.com') or not is_url_reachable('www.yahoo.com'):
		return False
	return True
	
def load_old_results(file_path):
	pickledata = {}
	if os.path.isfile('data.pkl'):
		picklefile = open('data.pkl','rb')
		pickledata = pickle.load(picklefile)
		picklefile.close()
	return pickledata
	
def store_results(file_path, data):
	output = open(file_path,'wb')
        pickle.dump(data, output)
        output.close()
	
def main(*args):
	# Setup logging - going to store time info in here
	logging.basicConfig(level=logging.WARNING, filename='checksites.log', 
			format='%(asctime)s %(levelname)s: %(message)s', 
			datefmt='%Y-%m-%d %H:%M:%S')
	
	# Load previous data
	pickle_file = 'data.pkl'
	pickledata = load_old_results(pickle_file)
		
	# Check sites only if Internet available
	if is_internet_reachable():
		# Skip the first arg since that is the name of the script
		for url in args[0][1:]:
			available = is_url_reachable(url)
			status = '%s is down' % url
			if available:
				status = '%s is up' % url
			print status
			if url in pickledata and pickledata[url] != available:
				# Send status messages wherever
				logging.warning(status)
				email_alert(str(get_headers(url)), status)
			pickledata[url] = available
	else:
		logging.error('Either the world ended or we are not connected to the net.')
		
	# Store results in pickle file
	store_results(pickle_file, pickledata)

if __name__ == '__main__':
	main(sys.argv)

I am new to python. Can this script send an email when the site is down?

I am new to python. Can this script send an email when the site is down?

yes it does send email when the website is down

can this script check the total active users on the website??

can this script check the total active users on the website??

nope

can this script monitor HTTPS connections also?

what is we have multiple websites to moniot at a time?how can we do it with this script