Gestionnaire de fichiers - Editer - /usr/lib/python2.7/site-packages/vdo/utils/Timeout.py
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# # Copyright (c) 2018 Red Hat, Inc. # # This program 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. # # This program 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 this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. # """ Timeout - context manager that implements a timeout. $Id: //eng/vdo-releases/magnesium/src/python/vdo/utils/Timeout.py#1 $ """ import signal ######################################################################## class TimeoutError(Exception): """Exception raised when a block times out.""" def __init__(self, msg = None, *args, **kwargs): super(TimeoutError, self).__init__(*args, **kwargs) if msg is None: msg = "timeout" self._msg = msg def __str__(self): return self._msg ######################################################################## class Timeout(object): """Context manager for running a block of commands under a timeout. If the block times out, a TimeoutError is raised. Arguments: seconds (int) - timeout in seconds msg (str) - message to supply to TimeoutError """ ###################################################################### # Public methods ###################################################################### ###################################################################### # Overridden methods ###################################################################### def __enter__(self): # Establish the alarm handler and set the alarm to go off. self.__oldHandler = signal.signal(signal.SIGALRM, lambda _signum, _frame : self._timeout()) signal.alarm(self.__seconds) return self ###################################################################### def __exit__(self, exceptionType, exceptionValue, traceback): # Turn off the alarm and re-establish the previous alarm handler. signal.alarm(0) signal.signal(signal.SIGALRM, self.__oldHandler) # Don't suppress exceptions. return False ###################################################################### def __init__(self, seconds, msg = None): self.__seconds = seconds self.__msg = msg self.__oldHandler = None ###################################################################### # Protected methods ###################################################################### def _timeout(self): """ Method invoked if the alarm goes off. """ raise TimeoutError(self.__msg) ###################################################################### # Private methods ######################################################################
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