64 lines
2.5 KiB
Python
64 lines
2.5 KiB
Python
# vim:ts=4:sw=4:ft=python:fileencoding=utf-8
|
|
# Copyright © 2015-2021 Carl Chenet <carl.chenet@ohmytux.com>
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>
|
|
|
|
'''Manage a lock file'''
|
|
|
|
# standard libraires imports
|
|
import datetime
|
|
import logging
|
|
import os
|
|
import os.path
|
|
import sys
|
|
|
|
class LockFile:
|
|
'''LockFile object'''
|
|
def __init__(self, lockfile, locktimeout):
|
|
'''check the lockfile and the locktimeout'''
|
|
self.lockfile = lockfile
|
|
ltimeout = datetime.timedelta(seconds=locktimeout)
|
|
self.lfdateformat = '%Y-%m-%d_%H-%M-%S'
|
|
# if a lock file exists
|
|
if os.path.exists(self.lockfile):
|
|
if os.path.isfile(self.lockfile):
|
|
with open(self.lockfile, 'r') as lf:
|
|
lfcontent = lf.read().rstrip()
|
|
# lfcontent should be a datetime
|
|
logging.debug('Check if lock file is older than timeout ({timeout} secs)'.format(timeout=locktimeout))
|
|
locktime = datetime.datetime.strptime(lfcontent, self.lfdateformat)
|
|
if locktime < (datetime.datetime.now() - ltimeout):
|
|
# remove the lock file
|
|
logging.debug('Found an expired lock file')
|
|
self.release()
|
|
self.create_lock()
|
|
else:
|
|
# quit because another feed2toot process is running
|
|
logging.debug('Found a valid lock file. Exiting immediately.')
|
|
sys.exit(0)
|
|
else:
|
|
# no lock file. Creating one
|
|
self.create_lock()
|
|
|
|
def create_lock(self):
|
|
'''Create a lock file'''
|
|
with open(self.lockfile, 'w') as lf:
|
|
currentdatestring = datetime.datetime.now().strftime(self.lfdateformat)
|
|
lf.write(currentdatestring)
|
|
logging.debug('lockfile {lockfile} created.'.format(lockfile=self.lockfile))
|
|
|
|
def release(self):
|
|
'''Release the lockfile'''
|
|
os.remove(self.lockfile)
|
|
logging.debug('Removed lock file.')
|