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Pythonic site monitor
#!/usr/bin/env python
# sample usage: checksites.py eriwen.com nixtutor.com yoursite.org
import pickle, os, sys, logging
from httplib import HTTPConnection, socket
from smtplib import SMTP
def email_alert(message, status):
fromaddr = 'you@gmail.com'
toaddrs = 'yourphone@txt.att.net'
server = SMTP('smtp.gmail.com:587')
server.starttls()
server.login('you', 'password')
server.sendmail(fromaddr, toaddrs, 'Subject: %s\r\n%s' % (status, message))
server.quit()
def get_site_status(url):
response = get_response(url)
try:
if getattr(response, 'status') == 200:
return 'up'
except AttributeError:
pass
return 'down'
def get_response(url):
'''Return response object from URL'''
try:
conn = HTTPConnection(url)
conn.request('HEAD', '/')
return conn.getresponse()
except socket.error:
return None
except:
logging.error('Bad URL:', url)
exit(1)
def get_headers(url):
'''Gets all headers from URL request and returns'''
response = get_response(url)
try:
return getattr(response, 'getheaders')()
except AttributeError:
return 'Headers unavailable'
def compare_site_status(prev_results):
'''Report changed status based on previous results'''
def is_status_changed(url):
status = get_site_status(url)
friendly_status = '%s is %s' % (url, status)
print friendly_status
if url in prev_results and prev_results[url] != status:
logging.warning(status)
# Email status messages
email_alert(str(get_headers(url)), friendly_status)
prev_results[url] = status
return is_status_changed
def is_internet_reachable():
'''Checks Google then Yahoo just in case one is down'''
if get_site_status('www.google.com') == 'down' and get_site_status('www.yahoo.com') == 'down':
return False
return True
def load_old_results(file_path):
'''Attempts to load most recent results'''
pickledata = {}
if os.path.isfile(file_path):
picklefile = open(file_path, 'rb')
pickledata = pickle.load(picklefile)
picklefile.close()
return pickledata
def store_results(file_path, data):
'''Pickles results to compare on next run'''
output = open(file_path, 'wb')
pickle.dump(data, output)
output.close()
def main(urls):
# Setup logging to store time
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 is_available
if is_internet_reachable():
status_checker = compare_site_status(pickledata)
map(status_checker, urls)
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__':
# First arg is script name, skip it
main(sys.argv[1:])
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