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Locked file interface that should work on Unix and Windows pythons. This module first tries to use fcntl locking to ensure serialized access to a file, then falls back on a lock file if that is unavialable. Usage: f = LockedFile('filename', 'r+b', 'rb') f.open_and_lock() if f.is_locked(): print('Acquired filename with r+b mode') f.file_handle().write('locked data') else: print('Acquired filename with rb mode') f.unlock_and_close()
Author: cache@google.com (David T McWherter)
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CredentialsFileSymbolicLinkError Credentials files must not be symbolic links. |
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AlreadyLockedException Trying to lock a file that has already been locked by the LockedFile. |
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_Opener Base class for different locking primitives. |
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_PosixOpener Lock files using Posix advisory lock files. |
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LockedFile Represent a file that has exclusive access. |
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logger = logging.getLogger(__name__)
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_FcntlOpener = None
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_Win32Opener = None
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