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📁 ..	-	2026-03-27 02:38
📄 __init__.py """ A platform independent file lock that supports the with-statement. .. autodata:: filelock.__version__ :no-value: """ from __future__ import annotations import sys import warnings from typing import TYPE_CHECKING from ._api import AcquireReturnProxy, BaseFileLock from ._error import Timeout from ._soft import SoftFileLock from ._unix import UnixFileLock, has_fcntl from ._windows import WindowsFileLock from .version import version #: version of the project as a string __version__: str = version if sys.platform == "win32": # pragma: win32 cover _FileLock: type[BaseFileLock] = WindowsFileLock else: # pragma: win32 no cover # noqa: PLR5501 if has_fcntl: _FileLock: type[BaseFileLock] = UnixFileLock else: _FileLock = SoftFileLock if warnings is not None: warnings.warn("only soft file lock is available", stacklevel=2) if TYPE_CHECKING: FileLock = SoftFileLock else: #: Alias for the lock, which should be used for the current platform. FileLock = _FileLock __all__ = [ "__version__", "FileLock", "SoftFileLock", "Timeout", "UnixFileLock", "WindowsFileLock", "BaseFileLock", "AcquireReturnProxy", ]	1.18 KB	2026-01-20 12:58
📁 __pycache__	-	2026-03-21 15:45
📄 _api.py from __future__ import annotations import contextlib import logging import os import time import warnings from abc import ABC, abstractmethod from dataclasses import dataclass from threading import local from typing import TYPE_CHECKING, Any, ClassVar from weakref import WeakValueDictionary from ._error import Timeout if TYPE_CHECKING: import sys from types import TracebackType if sys.version_info >= (3, 11): # pragma: no cover (py311+) from typing import Self else: # pragma: no cover (<py311) from typing_extensions import Self _LOGGER = logging.getLogger("filelock") # This is a helper class which is returned by :meth:`BaseFileLock.acquire` and wraps the lock to make sure __enter__ # is not called twice when entering the with statement. If we would simply return self, the lock would be acquired # again in the __enter__ method of the BaseFileLock, but not released again automatically. issue #37 (memory leak) class AcquireReturnProxy: """A context aware object that will release the lock file when exiting.""" def __init__(self, lock: BaseFileLock) -> None: self.lock = lock def __enter__(self) -> BaseFileLock: return self.lock def __exit__( self, exc_type: type[BaseException] \| None, exc_value: BaseException \| None, traceback: TracebackType \| None, ) -> None: self.lock.release() @dataclass class FileLockContext: """A dataclass which holds the context for a ``BaseFileLock`` object.""" # The context is held in a separate class to allow optional use of thread local storage via the # ThreadLocalFileContext class. #: The path to the lock file. lock_file: str #: The default timeout value. timeout: float #: The mode for the lock files mode: int #: The file descriptor for the _lock_file as it is returned by the os.open() function, not None when lock held lock_file_fd: int \| None = None #: The lock counter is used for implementing the nested locking mechanism. lock_counter: int = 0 # When the lock is acquired is increased and the lock is only released, when this value is 0 class ThreadLocalFileContext(FileLockContext, local): """A thread local version of the ``FileLockContext`` class.""" class BaseFileLock(ABC, contextlib.ContextDecorator): """Abstract base class for a file lock object.""" _instances: ClassVar[WeakValueDictionary[str, BaseFileLock]] = WeakValueDictionary() def __new__( # noqa: PLR0913 cls, lock_file: str \| os.PathLike[str], timeout: float = -1, # noqa: ARG003 mode: int = 0o644, # noqa: ARG003 thread_local: bool = True, # noqa: ARG003, FBT001, FBT002 , is_singleton: bool = False, kwargs: dict[str, Any], # capture remaining kwargs for subclasses # noqa: ARG003 ) -> Self: """Create a new lock object or if specified return the singleton instance for the lock file.""" if not is_singleton: return super().__new__(cls) instance = cls._instances.get(str(lock_file)) if not instance: instance = super().__new__(cls) cls._instances[str(lock_file)] = instance return instance # type: ignore[return-value] # https://github.com/python/mypy/issues/15322 def __init__( # noqa: PLR0913 self, lock_file: str \| os.PathLike[str], timeout: float = -1, mode: int = 0o644, thread_local: bool = True, # noqa: FBT001, FBT002 , is_singleton: bool = False, ) -> None: """ Create a new lock object. :param lock_file: path to the file :param timeout: default timeout when acquiring the lock, in seconds. It will be used as fallback value in \ the acquire method, if no timeout value (``None``) is given. If you want to disable the timeout, set it \ to a negative value. A timeout of 0 means, that there is exactly one attempt to acquire the file lock. :param mode: file permissions for the lockfile :param thread_local: Whether this object's internal context should be thread local or not. If this is set to \ ``False`` then the lock will be reentrant across threads. :param is_singleton: If this is set to ``True`` then only one instance of this class will be created \ per lock file. This is useful if you want to use the lock object for reentrant locking without needing \ to pass the same object around. """ self._is_thread_local = thread_local self._is_singleton = is_singleton # Create the context. Note that external code should not work with the context directly and should instead use # properties of this class. kwargs: dict[str, Any] = { "lock_file": os.fspath(lock_file), "timeout": timeout, "mode": mode, } self._context: FileLockContext = (ThreadLocalFileContext if thread_local else FileLockContext)(*kwargs) def is_thread_local(self) -> bool: """:return: a flag indicating if this lock is thread local or not""" return self._is_thread_local @property def is_singleton(self) -> bool: """:return: a flag indicating if this lock is singleton or not""" return self._is_singleton @property def lock_file(self) -> str: """:return: path to the lock file""" return self._context.lock_file @property def timeout(self) -> float: """ :return: the default timeout value, in seconds .. versionadded:: 2.0.0 """ return self._context.timeout @timeout.setter def timeout(self, value: float \| str) -> None: """ Change the default timeout value. :param value: the new value, in seconds """ self._context.timeout = float(value) @abstractmethod def _acquire(self) -> None: """If the file lock could be acquired, self._context.lock_file_fd holds the file descriptor of the lock file.""" raise NotImplementedError @abstractmethod def _release(self) -> None: """Releases the lock and sets self._context.lock_file_fd to None.""" raise NotImplementedError @property def is_locked(self) -> bool: """ :return: A boolean indicating if the lock file is holding the lock currently. .. versionchanged:: 2.0.0 This was previously a method and is now a property. """ return self._context.lock_file_fd is not None @property def lock_counter(self) -> int: """:return: The number of times this lock has been acquired (but not yet released).""" return self._context.lock_counter def acquire( self, timeout: float \| None = None, poll_interval: float = 0.05, , poll_intervall: float \| None = None, blocking: bool = True, ) -> AcquireReturnProxy: """ Try to acquire the file lock. :param timeout: maximum wait time for acquiring the lock, ``None`` means use the default :attr:`~timeout` is and if ``timeout < 0``, there is no timeout and this method will block until the lock could be acquired :param poll_interval: interval of trying to acquire the lock file :param poll_intervall: deprecated, kept for backwards compatibility, use ``poll_interval`` instead :param blocking: defaults to True. If False, function will return immediately if it cannot obtain a lock on the first attempt. Otherwise, this method will block until the timeout expires or the lock is acquired. :raises Timeout: if fails to acquire lock within the timeout period :return: a context object that will unlock the file when the context is exited .. code-block:: python # You can use this method in the context manager (recommended) with lock.acquire(): pass # Or use an equivalent try-finally construct: lock.acquire() try: pass finally: lock.release() .. versionchanged:: 2.0.0 This method returns now a proxy object instead of self, so that it can be used in a with statement without side effects. """ # Use the default timeout, if no timeout is provided. if timeout is None: timeout = self._context.timeout if poll_intervall is not None: msg = "use poll_interval instead of poll_intervall" warnings.warn(msg, DeprecationWarning, stacklevel=2) poll_interval = poll_intervall # Increment the number right at the beginning. We can still undo it, if something fails. self._context.lock_counter += 1 lock_id = id(self) lock_filename = self.lock_file start_time = time.perf_counter() try: while True: if not self.is_locked: _LOGGER.debug("Attempting to acquire lock %s on %s", lock_id, lock_filename) self._acquire() if self.is_locked: _LOGGER.debug("Lock %s acquired on %s", lock_id, lock_filename) break if blocking is False: _LOGGER.debug("Failed to immediately acquire lock %s on %s", lock_id, lock_filename) raise Timeout(lock_filename) # noqa: TRY301 if 0 <= timeout < time.perf_counter() - start_time: _LOGGER.debug("Timeout on acquiring lock %s on %s", lock_id, lock_filename) raise Timeout(lock_filename) # noqa: TRY301 msg = "Lock %s not acquired on %s, waiting %s seconds ..." _LOGGER.debug(msg, lock_id, lock_filename, poll_interval) time.sleep(poll_interval) except BaseException: # Something did go wrong, so decrement the counter. self._context.lock_counter = max(0, self._context.lock_counter - 1) raise return AcquireReturnProxy(lock=self) def release(self, force: bool = False) -> None: # noqa: FBT001, FBT002 """ Releases the file lock. Please note, that the lock is only completely released, if the lock counter is 0. Also note, that the lock file itself is not automatically deleted. :param force: If true, the lock counter is ignored and the lock is released in every case/ """ if self.is_locked: self._context.lock_counter -= 1 if self._context.lock_counter == 0 or force: lock_id, lock_filename = id(self), self.lock_file _LOGGER.debug("Attempting to release lock %s on %s", lock_id, lock_filename) self._release() self._context.lock_counter = 0 _LOGGER.debug("Lock %s released on %s", lock_id, lock_filename) def __enter__(self) -> Self: """ Acquire the lock. :return: the lock object """ self.acquire() return self def __exit__( self, exc_type: type[BaseException] \| None, exc_value: BaseException \| None, traceback: TracebackType \| None, ) -> None: """ Release the lock. :param exc_type: the exception type if raised :param exc_value: the exception value if raised :param traceback: the exception traceback if raised """ self.release() def __del__(self) -> None: """Called when the lock object is deleted.""" self.release(force=True) __all__ = [ "BaseFileLock", "AcquireReturnProxy", ]	11.58 KB	2026-01-20 12:58
📄 _error.py from __future__ import annotations from typing import Any class Timeout(TimeoutError): # noqa: N818 """Raised when the lock could not be acquired in timeout seconds.""" def __init__(self, lock_file: str) -> None: super().__init__() self._lock_file = lock_file def __reduce__(self) -> str \| tuple[Any, ...]: return self.__class__, (self._lock_file,) # Properly pickle the exception def __str__(self) -> str: return f"The file lock '{self._lock_file}' could not be acquired." def __repr__(self) -> str: return f"{self.__class__.__name__}({self.lock_file!r})" @property def lock_file(self) -> str: """:return: The path of the file lock.""" return self._lock_file __all__ = [ "Timeout", ]	787 B	2026-01-20 12:58
📄 _soft.py from __future__ import annotations import os import sys from contextlib import suppress from errno import EACCES, EEXIST from pathlib import Path from ._api import BaseFileLock from ._util import ensure_directory_exists, raise_on_not_writable_file class SoftFileLock(BaseFileLock): """Simply watches the existence of the lock file.""" def _acquire(self) -> None: raise_on_not_writable_file(self.lock_file) ensure_directory_exists(self.lock_file) # first check for exists and read-only mode as the open will mask this case as EEXIST flags = ( os.O_WRONLY # open for writing only \| os.O_CREAT \| os.O_EXCL # together with above raise EEXIST if the file specified by filename exists \| os.O_TRUNC # truncate the file to zero byte ) try: file_handler = os.open(self.lock_file, flags, self._context.mode) except OSError as exception: # re-raise unless expected exception if not ( exception.errno == EEXIST # lock already exist or (exception.errno == EACCES and sys.platform == "win32") # has no access to this lock ): # pragma: win32 no cover raise else: self._context.lock_file_fd = file_handler def _release(self) -> None: assert self._context.lock_file_fd is not None # noqa: S101 os.close(self._context.lock_file_fd) # the lock file is definitely not None self._context.lock_file_fd = None with suppress(OSError): # the file is already deleted and that's what we want Path(self.lock_file).unlink() __all__ = [ "SoftFileLock", ]	1.67 KB	2026-01-20 12:58
📄 _unix.py from __future__ import annotations import os import sys from contextlib import suppress from errno import ENOSYS from typing import cast from ._api import BaseFileLock from ._util import ensure_directory_exists #: a flag to indicate if the fcntl API is available has_fcntl = False if sys.platform == "win32": # pragma: win32 cover class UnixFileLock(BaseFileLock): """Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems.""" def _acquire(self) -> None: raise NotImplementedError def _release(self) -> None: raise NotImplementedError else: # pragma: win32 no cover try: import fcntl except ImportError: pass else: has_fcntl = True class UnixFileLock(BaseFileLock): """Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems.""" def _acquire(self) -> None: ensure_directory_exists(self.lock_file) open_flags = os.O_RDWR \| os.O_CREAT \| os.O_TRUNC fd = os.open(self.lock_file, open_flags, self._context.mode) with suppress(PermissionError): # This locked is not owned by this UID os.fchmod(fd, self._context.mode) try: fcntl.flock(fd, fcntl.LOCK_EX \| fcntl.LOCK_NB) except OSError as exception: os.close(fd) if exception.errno == ENOSYS: # NotImplemented error msg = "FileSystem does not appear to support flock; user SoftFileLock instead" raise NotImplementedError(msg) from exception else: self._context.lock_file_fd = fd def _release(self) -> None: # Do not remove the lockfile: # https://github.com/tox-dev/py-filelock/issues/31 # https://stackoverflow.com/questions/17708885/flock-removing-locked-file-without-race-condition fd = cast(int, self._context.lock_file_fd) self._context.lock_file_fd = None fcntl.flock(fd, fcntl.LOCK_UN) os.close(fd) __all__ = [ "has_fcntl", "UnixFileLock", ]	2.11 KB	2026-01-20 12:58
📄 _util.py from __future__ import annotations import os import stat import sys from errno import EACCES, EISDIR from pathlib import Path def raise_on_not_writable_file(filename: str) -> None: """ Raise an exception if attempting to open the file for writing would fail. This is done so files that will never be writable can be separated from files that are writable but currently locked :param filename: file to check :raises OSError: as if the file was opened for writing. """ try: # use stat to do exists + can write to check without race condition file_stat = os.stat(filename) # noqa: PTH116 except OSError: return # swallow does not exist or other errors if file_stat.st_mtime != 0: # if os.stat returns but modification is zero that's an invalid os.stat - ignore it if not (file_stat.st_mode & stat.S_IWUSR): raise PermissionError(EACCES, "Permission denied", filename) if stat.S_ISDIR(file_stat.st_mode): if sys.platform == "win32": # pragma: win32 cover # On Windows, this is PermissionError raise PermissionError(EACCES, "Permission denied", filename) else: # pragma: win32 no cover # noqa: RET506 # On linux / macOS, this is IsADirectoryError raise IsADirectoryError(EISDIR, "Is a directory", filename) def ensure_directory_exists(filename: Path \| str) -> None: """ Ensure the directory containing the file exists (create it if necessary) :param filename: file. """ Path(filename).parent.mkdir(parents=True, exist_ok=True) __all__ = [ "raise_on_not_writable_file", "ensure_directory_exists", ]	1.67 KB	2026-01-20 12:58
📄 _windows.py from __future__ import annotations import os import sys from contextlib import suppress from errno import EACCES from pathlib import Path from typing import cast from ._api import BaseFileLock from ._util import ensure_directory_exists, raise_on_not_writable_file if sys.platform == "win32": # pragma: win32 cover import msvcrt class WindowsFileLock(BaseFileLock): """Uses the :func:`msvcrt.locking` function to hard lock the lock file on Windows systems.""" def _acquire(self) -> None: raise_on_not_writable_file(self.lock_file) ensure_directory_exists(self.lock_file) flags = ( os.O_RDWR # open for read and write \| os.O_CREAT # create file if not exists \| os.O_TRUNC # truncate file if not empty ) try: fd = os.open(self.lock_file, flags, self._context.mode) except OSError as exception: if exception.errno != EACCES: # has no access to this lock raise else: try: msvcrt.locking(fd, msvcrt.LK_NBLCK, 1) except OSError as exception: os.close(fd) # close file first if exception.errno != EACCES: # file is already locked raise else: self._context.lock_file_fd = fd def _release(self) -> None: fd = cast(int, self._context.lock_file_fd) self._context.lock_file_fd = None msvcrt.locking(fd, msvcrt.LK_UNLCK, 1) os.close(fd) with suppress(OSError): # Probably another instance of the application hat acquired the file lock. Path(self.lock_file).unlink() else: # pragma: win32 no cover class WindowsFileLock(BaseFileLock): """Uses the :func:`msvcrt.locking` function to hard lock the lock file on Windows systems.""" def _acquire(self) -> None: raise NotImplementedError def _release(self) -> None: raise NotImplementedError __all__ = [ "WindowsFileLock", ]	2.13 KB	2026-01-20 12:58
📄 py.typed	0 B	2026-01-20 12:58
📄 version.py # file generated by setuptools_scm # don't change, don't track in version control TYPE_CHECKING = False if TYPE_CHECKING: from typing import Tuple, Union VERSION_TUPLE = Tuple[Union[int, str], ...] else: VERSION_TUPLE = object version: str __version__: str __version_tuple__: VERSION_TUPLE version_tuple: VERSION_TUPLE __version__ = version = '3.13.1' __version_tuple__ = version_tuple = (3, 13, 1)	413 B	2026-01-20 12:58

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