Process monitor template with logger and email notifier (daemonized)

If you are looking for a template to write a fast copy-and-paste script (daemonized) for monitoring one process... you can get some ideas from this:

	#!/usr/bin/env python
	import os, smtplib
	from sys import exit
	from time import sleep, gmtime, strftime
	########## Configuration here ##############
	processname = 'init'
	checkseconds = 5
	maxalerts = 2
	sender = 'notify@domain.com'
	receivers = ['myemail@mymail.com']
	emailpassword = 'myemailpass'
	smtpserver = 'smtp.server.net'
	logfilename = 'monitor.log'
	########## End configuration ###########
	message = ("From: Monitor <%s>\r\nTo: Warning <%s>\r\nSubject: e-mail Alert Monitor\r\nProcess is down!" % (sender, ", ".join(receivers)))
	fail = 0
	#Crazy logger
	def writelog (message):
	global logfile
	try:
	# This tries to open an existing file but creates a new file if necessary.
	logfile = open(logfilename, "a")
	try:
	logfile.write(message)
	finally:
	logfile.close()
	except IOError:
	pass
	# Notifying via Email
	def advice():
	try:
	smtpObj = smtplib.SMTP(smtpserver, 25)
	smtpObj.login (sender,emailpassword)
	smtpObj.sendmail(sender, receivers, message)
	writelog ("%s Successfully sent email\n" % (strftime("%d %b %Y %H:%M:%S", gmtime())))
	smtpObj.quit()
	except SMTPException:
	writelog ("%s Error: unable to send email\n" % (strftime("%d %b %Y %H:%M:%S", gmtime())))
	# print ("exiting...")
	# exit (1)
	# Vicente trick of the hell
	def monitor():
	global fail
	tmp = os.popen("ps -Af").read()
	proccount = tmp.count(processname)
	if proccount < 1:
	fail = fail + 1
	writelog ('%s %s **STOPPED** (alert %d)\n' % (strftime("%d %b %Y %H:%M:%S", gmtime()), processname, fail))
	if fail == maxalerts:
	advice()
	else:
	fail = 0
	sleep(checkseconds)
	def main():
	while 1:
	monitor()
	# Dual fork hack to make process run as a daemon thanks to Active Programmer Network
	if __name__ == "__main__":
	try:
	pid = os.fork()
	if pid > 0:
	exit(0)
	except OSError, e:
	exit(1)
	os.chdir("/tmp")
	os.setsid()
	os.umask(0)
	try:
	pid = os.fork()
	if pid > 0:
	exit(0)
	except OSError, e:
	exit(1)
	main()

view raw process_mon.py hosted with ❤ by GitHub