Dec 062015
 

After waiting for several years, we finally got fiber internet connection two months ago.
Sadly in these two months we have had three occasions when we had no connection to internet at all.
Last time, a couple of days ago, it was out for more than 24 hours!
This is way worse than I expected, and much worse than the old ADSL connection we had before.
On the good side is, that when we actually have connection, it works really good.

But to have better statistics on the connection reliability I made a small python program.

#!/usr/bin/python2 -tt
# Joakim Wesslen

'''
Check internet connection and log result to file
'''

"""
The MIT License (MIT)

Copyright (c) 2015 Joakim Wesslen

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

"""

import sys
import time
import urllib2
import socket


logfile = "ispwatcher.txt"
loop_delay_minutes = 30
seconds_per_minute = 60

urls = [
'www.dn.se',
'www.sds.se',
'www.svd.se',
'www.cnn.com',
'www.bbc.co.uk',
'www.dmi.dk',
'www.nrk.no'
]


def getdatetime():
	'''Get date time string'''
	return time.strftime("%Y-%m-%d_%H:%M:%S")


def check_url(url):
	'''check url connection'''
	try:
		response=urllib2.urlopen('http://' + url, timeout=10)
		return True
	except urllib2.URLError as err: 
		pass

	dt = getdatetime()
	s = "Error: {}: {}".format(dt, url)
	print s
	write_result(dt, s)
	return False


def check_urls(urls):
	'''check list of urls'''
	results = []
	for url in urls:
		res = check_url(url)
		results.append(res)
	return results


def calc_result(results):
	'''
	calculate the result of check_urls.
	if one url is accessible, we are connected.
	'''
	if True	in results:
		result = "connected"
	else:
		result = "disconnected"
	return result		


def write_result(dt, result):
	'''write result string to file with datetime'''
	s = "{}: {}".format(dt, result)
	print s
	with open(logfile, "a") as txt_file:
		txt_file.write(s + "\n")


def wait_minutes(minutes):
	'''wait some minutes'''
	time.sleep(minutes * seconds_per_minute)


def get_lock(process_name):
	'''make sure only one instance exists'''
	global lock_socket
	lock_socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
	try:
		lock_socket.bind('\0' + process_name)
	except socket.error:
		print "Already running"
		sys.exit()


def close_lock():
	'''release the lock'''
	global lock_socket
	try:
		lock_socket.close()
	except socket.error:
		print "close_lock exception!"


def main(args):
	try:
		while True:
			dt = getdatetime()
			results = check_urls(urls)
			result = calc_result(results)
			write_result(dt, result)
			wait_minutes(loop_delay_minutes)
	except KeyboardInterrupt:
		print 'Stopped by user'
		close_lock()
		sys.exit(0)


if __name__ == '__main__':
	get_lock('ispwatcher')
	sys.exit(main(sys.argv[1:]))

The program checks internet connection two times per hour, and writes the result to a file.
I put it on a Raspberry Pi, connected directly to the router, and also set up a cron job to make sure it runs.
The cron job starts the script every half-hour, and is done as:

00 * * * * /home/pi/ispwatcher.sh
30 * * * * /home/pi/ispwatcher.sh

The shell script is simply starting the python program.

As you can see the python program makes sure only one instance is running, so this setup should be okay I hope.
Let's see what the result will show.

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