e407b78506
* Remove six for PY2 compatability since our dependencies are not, PY2 is legacy. * Removed usages of utils from future/past libraries since they are deprecated. This includes 'from __future__ ...' and 'from past...' statements. * Removed compatibility imports for PY2, switched from six imports to standard library imports. * Removed utils code blocks that handle operations depending on PY2/3 versions. * Removed 'from __future__ ...' lines from templates/code generators * Used PY3 syntaxes in place of PY2 compatible blocks. eg: metaclass
46 lines
1,023 B
Python
46 lines
1,023 B
Python
# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
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# MIT License. See license.txt
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'''
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File based locking utility
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'''
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import os
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from time import time
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from frappe.utils import get_site_path, touch_file
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class LockTimeoutError(Exception):
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pass
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def create_lock(name):
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'''Creates a file in the /locks folder by the given name'''
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lock_path = get_lock_path(name)
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if not check_lock(lock_path):
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return touch_file(lock_path)
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else:
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return False
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def lock_exists(name):
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'''Returns True if lock of the given name exists'''
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return os.path.exists(get_lock_path(name))
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def check_lock(path, timeout=600):
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if not os.path.exists(path):
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return False
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if time() - os.path.getmtime(path) > timeout:
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raise LockTimeoutError(path)
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return True
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def delete_lock(name):
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lock_path = get_lock_path(name)
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try:
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os.remove(lock_path)
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except OSError:
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pass
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return True
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def get_lock_path(name):
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name = name.lower()
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locks_dir = 'locks'
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lock_path = get_site_path(locks_dir, name + '.lock')
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return lock_path
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