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Edit File : file_lock.py \| Size : 2.29 KB
from __future__ import annotations import contextlib import errno import sys from collections.abc import Generator from typing import Callable if sys.platform == 'win32': # pragma: no cover (windows) import msvcrt # https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/locking # on windows we lock "regions" of files, we don't care about the actual # byte region so we'll just pick some number here. _region = 0xffff @contextlib.contextmanager def _locked( fileno: int, blocked_cb: Callable[[], None], ) -> Generator[None]: try: msvcrt.locking(fileno, msvcrt.LK_NBLCK, _region) except OSError: blocked_cb() while True: try: msvcrt.locking(fileno, msvcrt.LK_LOCK, _region) except OSError as e: # Locking violation. Returned when the _LK_LOCK or _LK_RLCK # flag is specified and the file cannot be locked after 10 # attempts. if e.errno != errno.EDEADLOCK: raise else: break try: yield finally: # From cursory testing, it seems to get unlocked when the file is # closed so this may not be necessary. # The documentation however states: # "Regions should be locked only briefly and should be unlocked # before closing a file or exiting the program." msvcrt.locking(fileno, msvcrt.LK_UNLCK, _region) else: # pragma: win32 no cover import fcntl @contextlib.contextmanager def _locked( fileno: int, blocked_cb: Callable[[], None], ) -> Generator[None]: try: fcntl.flock(fileno, fcntl.LOCK_EX \| fcntl.LOCK_NB) except OSError: # pragma: no cover (tests are single-threaded) blocked_cb() fcntl.flock(fileno, fcntl.LOCK_EX) try: yield finally: fcntl.flock(fileno, fcntl.LOCK_UN) @contextlib.contextmanager def lock( path: str, blocked_cb: Callable[[], None], ) -> Generator[None]: with open(path, 'a+') as f: with _locked(f.fileno(), blocked_cb): yield Back

Edit File : file_lock.py | Size : 2.29 KB

from __future__ import annotations

import contextlib
import errno
import sys
from collections.abc import Generator
from typing import Callable

if sys.platform == 'win32':  # pragma: no cover (windows)
    import msvcrt

# https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/locking

# on windows we lock "regions" of files, we don't care about the actual
    # byte region so we'll just pick *some* number here.
    _region = 0xffff

@contextlib.contextmanager
    def _locked(
            fileno: int,
            blocked_cb: Callable[[], None],
    ) -> Generator[None]:
        try:
            msvcrt.locking(fileno, msvcrt.LK_NBLCK, _region)
        except OSError:
            blocked_cb()
            while True:
                try:
                    msvcrt.locking(fileno, msvcrt.LK_LOCK, _region)
                except OSError as e:
                    # Locking violation. Returned when the _LK_LOCK or _LK_RLCK
                    # flag is specified and the file cannot be locked after 10
                    # attempts.
                    if e.errno != errno.EDEADLOCK:
                        raise
                else:
                    break

try:
            yield
        finally:
            # From cursory testing, it seems to get unlocked when the file is
            # closed so this may not be necessary.
            # The documentation however states:
            # "Regions should be locked only briefly and should be unlocked
            # before closing a file or exiting the program."
            msvcrt.locking(fileno, msvcrt.LK_UNLCK, _region)
else:  # pragma: win32 no cover
    import fcntl

@contextlib.contextmanager
    def _locked(
            fileno: int,
            blocked_cb: Callable[[], None],
    ) -> Generator[None]:
        try:
            fcntl.flock(fileno, fcntl.LOCK_EX | fcntl.LOCK_NB)
        except OSError:  # pragma: no cover (tests are single-threaded)
            blocked_cb()
            fcntl.flock(fileno, fcntl.LOCK_EX)
        try:
            yield
        finally:
            fcntl.flock(fileno, fcntl.LOCK_UN)

@contextlib.contextmanager
def lock(
        path: str,
        blocked_cb: Callable[[], None],
) -> Generator[None]:
    with open(path, 'a+') as f:
        with _locked(f.fileno(), blocked_cb):
            yield

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