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47 lines
1.3 KiB
Python
47 lines
1.3 KiB
Python
"""Registers and calls cleanup functions in case of an error."""
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import os
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import signal
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_SIGNALS = [signal.SIGTERM] if os.name == "nt" else
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[signal.SIGTERM, signal.SIGHUP, signal.SIGQUIT,
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signal.SIGXCPU, signal.SIGXFSZ, signal.SIGPWR,]
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class ErrorHandler():
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"""Registers and calls cleanup functions in case of an error."""
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def __init__(self, func=None):
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self.funcs = []
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if func:
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self.funcs.append(func)
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def __enter__(self):
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self.set_signal_handlers()
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def __exit__(self, exec_type, exec_value, traceback):
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if exec_value is not None:
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self.cleanup()
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self.reset_signal_handlers()
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def register(self, func):
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"""Registers func to be called if an error occurs."""
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self.funcs.append(func)
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def cleanup(self):
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"""Calls all registered functions."""
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while self.funcs:
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self.funcs.pop()()
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def set_signal_handlers(self):
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for signal_type in _SIGNALS:
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signal.signal(signal_type, self._signal_handler)
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def reset_signal_handlers(self):
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for signal_type in _SIGNALS:
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signal.signal(signal_type, signal.SIG_DFL)
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def _signal_handler(self, signum, frame):
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self.cleanup()
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signal.signal(signal_type, signal.SIG_DFL)
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os.kill(os.getpid(), signum)
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