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67 lines
2.1 KiB
Python
67 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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from __future__ import (absolute_import, division, print_function,
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unicode_literals)
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import signal
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class JobTimeoutException(Exception):
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"""Raised when a job takes longer to complete than the allowed maximum
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timeout value.
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"""
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pass
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class BaseDeathPenalty(object):
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"""Base class to setup job timeouts."""
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def __init__(self, timeout):
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self._timeout = timeout
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def __enter__(self):
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self.setup_death_penalty()
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def __exit__(self, type, value, traceback):
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# Always cancel immediately, since we're done
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try:
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self.cancel_death_penalty()
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except JobTimeoutException:
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# Weird case: we're done with the with body, but now the alarm is
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# fired. We may safely ignore this situation and consider the
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# body done.
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pass
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# __exit__ may return True to supress further exception handling. We
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# don't want to suppress any exceptions here, since all errors should
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# just pass through, JobTimeoutException being handled normally to the
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# invoking context.
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return False
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def setup_death_penalty(self):
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raise NotImplementedError()
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def cancel_death_penalty(self):
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raise NotImplementedError()
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class UnixSignalDeathPenalty(BaseDeathPenalty):
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def handle_death_penalty(self, signum, frame):
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raise JobTimeoutException('Job exceeded maximum timeout '
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'value ({0} seconds)'.format(self._timeout))
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def setup_death_penalty(self):
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"""Sets up an alarm signal and a signal handler that raises
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a JobTimeoutException after the timeout amount (expressed in
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seconds).
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"""
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signal.signal(signal.SIGALRM, self.handle_death_penalty)
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signal.alarm(self._timeout)
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def cancel_death_penalty(self):
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"""Removes the death penalty alarm and puts back the system into
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default signal handling.
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"""
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signal.alarm(0)
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signal.signal(signal.SIGALRM, signal.SIG_DFL)
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