whoami7 - Manager
:
/
proc
/
self
/
root
/
opt
/
hc_python
/
lib64
/
python3.8
/
site-packages
/
virtualenv
/
util
/
Upload File:
files >> //proc/self/root/opt/hc_python/lib64/python3.8/site-packages/virtualenv/util/lock.py
"""holds locking functionality that works across processes.""" from __future__ import annotations import logging import os from abc import ABC, abstractmethod from contextlib import contextmanager, suppress from pathlib import Path from threading import Lock, RLock from filelock import FileLock, Timeout class _CountedFileLock(FileLock): def __init__(self, lock_file) -> None: parent = os.path.dirname(lock_file) if not os.path.isdir(parent): with suppress(OSError): os.makedirs(parent) super().__init__(lock_file) self.count = 0 self.thread_safe = RLock() def acquire(self, timeout=None, poll_interval=0.05): if not self.thread_safe.acquire(timeout=-1 if timeout is None else timeout): raise Timeout(self.lock_file) if self.count == 0: super().acquire(timeout, poll_interval) self.count += 1 def release(self, force=False): # noqa: FBT002 with self.thread_safe: if self.count > 0: self.thread_safe.release() if self.count == 1: super().release(force=force) self.count = max(self.count - 1, 0) _lock_store = {} _store_lock = Lock() class PathLockBase(ABC): def __init__(self, folder) -> None: path = Path(folder) self.path = path.resolve() if path.exists() else path def __repr__(self) -> str: return f"{self.__class__.__name__}({self.path})" def __truediv__(self, other): return type(self)(self.path / other) @abstractmethod def __enter__(self): raise NotImplementedError @abstractmethod def __exit__(self, exc_type, exc_val, exc_tb): raise NotImplementedError @abstractmethod @contextmanager def lock_for_key(self, name, no_block=False): # noqa: FBT002 raise NotImplementedError @abstractmethod @contextmanager def non_reentrant_lock_for_key(self, name): raise NotImplementedError class ReentrantFileLock(PathLockBase): def __init__(self, folder) -> None: super().__init__(folder) self._lock = None def _create_lock(self, name=""): lock_file = str(self.path / f"{name}.lock") with _store_lock: if lock_file not in _lock_store: _lock_store[lock_file] = _CountedFileLock(lock_file) return _lock_store[lock_file] @staticmethod def _del_lock(lock): if lock is not None: with _store_lock, lock.thread_safe: if lock.count == 0: _lock_store.pop(lock.lock_file, None) def __del__(self) -> None: self._del_lock(self._lock) def __enter__(self): self._lock = self._create_lock() self._lock_file(self._lock) def __exit__(self, exc_type, exc_val, exc_tb): self._release(self._lock) self._del_lock(self._lock) self._lock = None def _lock_file(self, lock, no_block=False): # noqa: FBT002 # multiple processes might be trying to get a first lock... so we cannot check if this directory exist without # a lock, but that lock might then become expensive, and it's not clear where that lock should live. # Instead here we just ignore if we fail to create the directory. with suppress(OSError): os.makedirs(str(self.path)) try: lock.acquire(0.0001) except Timeout: if no_block: raise logging.debug("lock file %s present, will block until released", lock.lock_file) lock.release() # release the acquire try from above lock.acquire() @staticmethod def _release(lock): lock.release() @contextmanager def lock_for_key(self, name, no_block=False): # noqa: FBT002 lock = self._create_lock(name) try: try: self._lock_file(lock, no_block) yield finally: self._release(lock) finally: self._del_lock(lock) lock = None @contextmanager def non_reentrant_lock_for_key(self, name): with _CountedFileLock(str(self.path / f"{name}.lock")): yield class NoOpFileLock(PathLockBase): def __enter__(self): raise NotImplementedError def __exit__(self, exc_type, exc_val, exc_tb): raise NotImplementedError @contextmanager def lock_for_key(self, name, no_block=False): # noqa: ARG002, FBT002 yield @contextmanager def non_reentrant_lock_for_key(self, name): # noqa: ARG002 yield __all__ = [ "NoOpFileLock", "ReentrantFileLock", "Timeout", ]
Copyright ©2021 || Defacer Indonesia