webup

Python Web Reloader

I’m currently writing a python script to analyse web servers for connectivity. Due to various issues I have encountered whilst running this and other sites such as DDOS attacks and Mysql failing due to lack of memory. So far it probes a given site to see if it is active. If it detects connectivity it will attempt to restart the apache server.
One cool thing I learnt whilst doing this was correctly logging the output of the script using the python logging lib. The next update in this project will be to add a feature whereby it will e-mail and attach these logs for viewing by an admin should the site be down. Another idea I’m mulling  over is the ability to tail the access log of apache and detect if a site is currently under attack. Then hopefully update the IPTables to block that address.
The code so far – Note this is still in development!


import requests
import sys
import subprocess
import logging
class WebUp():
    def __init__(self):
        if(len(sys.argv) < 2) :
            print ('Usage : python webup.py http://example.com')
            sys.exit()
        self.url = sys.argv[1]

	logging.basicConfig(filename='/home/usrname/WebUp.log',format='%(asctime)s %(levelname)s:%(message)s', level=logging.DEBUG, datefmt='%d/%m/%Y %I:%M:%S %p')
    def checkURL(self):
        try:
         r = requests.head(self.url)
	 if r.status_code == 200:
	         logging.info("Website OK" + str(r.status_code))
         return r.status_code == 200
        except ( requests.exceptions.RequestException) as e:
#            print("Connection Error " + str(e))
            self.handleError(e)
    def handleError(self,e):
        # Log error 
        # Get latest tail of access.log
        # Attach to e-mail?
        # Exit
        logging.warning('Website is down due to:' + str(e))
	# restart apache
	logging.info("Attempting to restart apache2 service")
	p = subprocess.Popen("sudo service apache2 restart", shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        for line in p.stdout.readlines():
		print (line)
        retval = p.wait()
	self.checkURL()
if __name__ == '__main__':
    checker = WebUp()
    checker.checkURL()


A-Level Mock Assesment

A-Level Mock Assessment 2016

Based upon the WJEC A-Level specification I have put together a practical mock exam for students studying for the 2016 practical exam.
You can find it here

The exam contains similar questions to that of the exam whereby:
The first section is about their ability to demonstrate that they can read, understand and fix code.
There is a series of broken code that they should fill in.
I have also made a video tutorial on how to tackle part one which can be found here

The second part of the practical is to create a similar User interface.
They are then required to implement various algorithms such as saving information to files and then searching that file for a particular record.
A video tutorial on how to tackle part two can be found here