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https://github.com/wassname/catalyst.git
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Eddie Hebert
77af1ca632
Mostly whitespace, line width and other spacing changes. Also, removes use of deprecated has_key in favor of `in` Going forward new patches should pass running `flake8` before submission.
42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
from functools import wraps
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from signal import signal
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class delayed_signals(object):
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"""
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Utility to temporary intercept one or more signals while a function or code
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block is executed, restore their signal handlers at the end of execution,
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and invoke them if the signals were in fact received during execution.
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Can be used either as a decorator or a context manager.
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Pass in an iterable of signals to intercept.
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"""
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def handler(self, signum, frame=None):
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self.got.append({'signum': signum, 'frame': frame})
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def __init__(self, signals):
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self.signals = signals
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self.handlers = {}
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self.got = []
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def __enter__(self):
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for signum in self.signals:
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# signal() returns the old signal handler
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self.handlers[signum] = signal(signum, self.handler)
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def __exit__(self, time, value, traceback):
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for signum, handler in self.handlers.items():
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signal(signum, handler)
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for signum, frame in ((i['signum'], i['frame']) for i in self.got):
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self.handlers[signum](signum, frame)
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def __call__(self, fn):
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@wraps(fn)
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def call_fn(*args, **kwargs):
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with self:
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outval = fn(*args, **kwargs)
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return outval
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return call_fn
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