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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Example on how to create a daemon.
If you are confused on how the daemon library works you can get some ideas
from the tests.
https://pagure.io/python-daemon/blob/master/f/test/test_runner.py
"""
from logging import FileHandler, Formatter, getLogger, info
from os import fork, setsid, getpid
from sys import exit
from time import sleep
class MyDaemon(object):
"""Daemon class. Not for production use, example only."""
def __init__(self):
"""Initialize the paths and the pidfile of the daemon."""
self.stdin_path = '/dev/null'
self.stdout_path = '/dev/null'
self.stderr_path = '/dev/null'
self.pidfile_path = '/var/run/python_daemon.pid'
def create_pidfile(self):
with open(self.pidfile_path, mode='w', encoding='utf-8') as a_file:
a_file.write(str('{}\n'.format(self.pid)))
def detach_process(self):
"""Simple method for daemonizing process."""
newpid = fork()
if newpid > 0:
exit()
else:
setsid()
newpid = fork()
if newpid > 0:
exit()
else:
self.pid = getpid()
self.create_pidfile()
return
def run(self):
"""Entrypoint for the daemon."""
self.detach_process()
# Setup logging
log = getLogger()
handler = FileHandler('/var/log/python_daemon.log')
formatter = Formatter('%(asctime)s %(levelname)s %(message)s')
handler.setFormatter(formatter)
log.addHandler(handler)
log.setLevel('INFO')
while True:
info('I am alive')
sleep(1)
# run the daemon
if __name__ == '__main__':
daemon = MyDaemon()
daemon.run()
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