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jailthread.py
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*- # vi: set ft=python sts=4 ts=4 sw=4 noet : # This file is part of Fail2Ban. # # Fail2Ban is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # Fail2Ban is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Fail2Ban; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. # Author: Cyril Jaquier # __author__ = "Cyril Jaquier" __copyright__ = "Copyright (c) 2004 Cyril Jaquier" __license__ = "GPL" import sys from threading import Thread from abc import abstractmethod from .utils import Utils from ..helpers import excepthook, prctl_set_th_name class JailThread(Thread): """Abstract class for threading elements in Fail2Ban. Attributes ---------- daemon ident name status active : bool Control the state of the thread. idle : bool Control the idle state of the thread. sleeptime : int The time the thread sleeps for in the loop. """ def __init__(self, name=None): super(JailThread, self).__init__(name=name) ## Should going with main thread also: self.daemon = True ## Control the state of the thread (None - was not started, True - active, False - stopped). self.active = None ## Control the idle state of the thread. self.idle = False ## The time the thread sleeps in the loop. self.sleeptime = Utils.DEFAULT_SLEEP_TIME # excepthook workaround for threads, derived from: # http://bugs.python.org/issue1230540#msg91244 run = self.run def run_with_except_hook(*args, **kwargs): try: run(*args, **kwargs) # call on stop callback to do some finalizations: self.onStop() except Exception as e: # avoid very sporadic error "'NoneType' object has no attribute 'exc_info'" (https://bugs.python.org/issue7336) # only extremely fast systems are affected ATM (2.7 / 3.x), if thread ends nothing is available here. if sys is not None: excepthook(*sys.exc_info()) else: print(e) self.run = run_with_except_hook if sys.version_info >= (3,): # pragma: 2.x no cover def _bootstrap(self): prctl_set_th_name(self.name) return super(JailThread, self)._bootstrap(); else: # pragma: 3.x no cover def __bootstrap(self): prctl_set_th_name(self.name) return Thread._Thread__bootstrap(self) @abstractmethod def status(self, flavor="basic"): # pragma: no cover - abstract """Abstract - Should provide status information. """ pass def start(self): """Sets active flag and starts thread. """ self.active = True super(JailThread, self).start() @abstractmethod def onStop(self): # pragma: no cover - absract """Abstract - Called when thread ends (after run). """ pass def stop(self): """Sets `active` property to False, to flag run method to return. """ self.active = False @abstractmethod def run(self): # pragma: no cover - absract """Abstract - Called when thread starts, thread stops when returns. """ pass def join(self): """ Safer join, that could be called also for not started (or ended) threads (used for cleanup). """ ## if cleanup needed - create derivate and call it before join... ## if was really started - should call join: if self.active is not None: super(JailThread, self).join() ## python 2.x replace binding of private __bootstrap method: if sys.version_info < (3,): # pragma: 3.x no cover JailThread._Thread__bootstrap = JailThread._JailThread__bootstrap ## python 3.9, restore isAlive method: elif not hasattr(JailThread, 'isAlive'): # pragma: 2.x no cover JailThread.isAlive = JailThread.is_alive
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