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locked_storage.py
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locked_storage.py
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# Copyright 2014 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Lock-safe storage for OAuth2 Credentials.
This module provides the LockStorage base class that is used to provide
optional lock safety to Storage sub-classes.
"""
import os
import threading
from oauth2client.client import Storage as Storage
__author__ = 'jonwayne@google.com (Jon Wayne Parrott)'
class LockedStorage(Storage):
"""Storage base class that provides optional locking."""
def __init__(self, lock=None):
"""Create a LockedStorage instance.
Args:
lock: An optional threading.Lock-like object. Must implement at
least acquire() and release(). Does not need to be re-entrant.
"""
self._lock = lock
def acquire_lock(self):
"""Acquires any lock necessary to access this storage."""
if self._lock is not None:
self._lock.acquire()
def release_lock(self):
"""Releases the storage lock.
Trying to release a lock that isn't held will result in a
RuntimeError.
"""
if self._lock is not None:
self._lock.release()