mirror of https://gitlab.com/chaica/feed2toot
64 lines
2.5 KiB
Python
64 lines
2.5 KiB
Python
# vim:ts=4:sw=4:ft=python:fileencoding=utf-8
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# Copyright © 2015-2020 Carl Chenet <carl.chenet@ohmytux.com>
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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'''Manage a lock file'''
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# standard libraires imports
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import datetime
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import logging
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import os
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import os.path
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import sys
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class LockFile:
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'''LockFile object'''
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def __init__(self, lockfile, locktimeout):
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'''check the lockfile and the locktimeout'''
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self.lockfile = lockfile
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ltimeout = datetime.timedelta(seconds=locktimeout)
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self.lfdateformat = '%Y-%m-%d_%H-%M-%S'
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# if a lock file exists
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if os.path.exists(self.lockfile):
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if os.path.isfile(self.lockfile):
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with open(self.lockfile, 'r') as lf:
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lfcontent = lf.read().rstrip()
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# lfcontent should be a datetime
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logging.debug('Check if lock file is older than timeout ({timeout} secs)'.format(timeout=locktimeout))
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locktime = datetime.datetime.strptime(lfcontent, self.lfdateformat)
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if locktime < (datetime.datetime.now() - ltimeout):
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# remove the lock file
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logging.debug('Found an expired lock file')
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self.release()
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self.create_lock()
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else:
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# quit because another feed2toot process is running
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logging.debug('Found a valid lock file. Exiting immediately.')
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sys.exit(0)
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else:
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# no lock file. Creating one
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self.create_lock()
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def create_lock(self):
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'''Create a lock file'''
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with open(self.lockfile, 'w') as lf:
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currentdatestring = datetime.datetime.now().strftime(self.lfdateformat)
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lf.write(currentdatestring)
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logging.debug('lockfile {lockfile} created.'.format(lockfile=self.lockfile))
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def release(self):
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'''Release the lockfile'''
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os.remove(self.lockfile)
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logging.debug('Removed lock file.')
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