diff options
Diffstat (limited to 'oauth2client/contrib/_fcntl_opener.py')
-rw-r--r-- | oauth2client/contrib/_fcntl_opener.py | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/oauth2client/contrib/_fcntl_opener.py b/oauth2client/contrib/_fcntl_opener.py deleted file mode 100644 index ae6c85b..0000000 --- a/oauth2client/contrib/_fcntl_opener.py +++ /dev/null @@ -1,81 +0,0 @@ -# Copyright 2016 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. - -import errno -import fcntl -import time - -from oauth2client.contrib import locked_file - - -class _FcntlOpener(locked_file._Opener): - """Open, lock, and unlock a file using fcntl.lockf.""" - - def open_and_lock(self, timeout, delay): - """Open the file and lock it. - - Args: - timeout: float, How long to try to lock for. - delay: float, How long to wait between retries - - Raises: - AlreadyLockedException: if the lock is already acquired. - IOError: if the open fails. - CredentialsFileSymbolicLinkError: if the file is a symbolic - link. - """ - if self._locked: - raise locked_file.AlreadyLockedException( - 'File {0} is already locked'.format(self._filename)) - start_time = time.time() - - locked_file.validate_file(self._filename) - try: - self._fh = open(self._filename, self._mode) - except IOError as e: - # If we can't access with _mode, try _fallback_mode and - # don't lock. - if e.errno in (errno.EPERM, errno.EACCES): - self._fh = open(self._filename, self._fallback_mode) - return - - # We opened in _mode, try to lock the file. - while True: - try: - fcntl.lockf(self._fh.fileno(), fcntl.LOCK_EX) - self._locked = True - return - except IOError as e: - # If not retrying, then just pass on the error. - if timeout == 0: - raise - if e.errno != errno.EACCES: - raise - # We could not acquire the lock. Try again. - if (time.time() - start_time) >= timeout: - locked_file.logger.warn('Could not lock %s in %s seconds', - self._filename, timeout) - if self._fh: - self._fh.close() - self._fh = open(self._filename, self._fallback_mode) - return - time.sleep(delay) - - def unlock_and_close(self): - """Close and unlock the file using the fcntl.lockf primitive.""" - if self._locked: - fcntl.lockf(self._fh.fileno(), fcntl.LOCK_UN) - self._locked = False - if self._fh: - self._fh.close() |