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functions to be called if an exception or signal
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sGContext manager for running code that must be cleaned up on failure.
The context manager allows you to register functions that will be
called
when an exception (excluding SystemExit) or signal is encountered.
Usage::
handler = ErrorHandler(cleanup1_func, *cleanup1_args,
**cleanup1_kwargs)
handler.register(cleanup2_func, *cleanup2_args, **cleanup2_kwargs)
with handler:
do_something()
Or for one cleanup function::
with ErrorHandler(func, args, kwargs):
do_something()
If an exception is raised out of do_something, the cleanup functions
will
be called in last in first out order. Then the exception is raised.
Similarly, if a signal is encountered, the cleanup functions are called
followed by the previously received signal handler.
Each registered cleanup function is called exactly once. If a
registered
function raises an exception, it is logged and the next function is
called.
Signals received while the registered functions are executing are
deferred until they finish.
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signal handlers for signals in
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function for handling received signals.
Store the received signal. If we are executing the code block in
the body of the context manager, stop by raising signal exit.
:param int signum: number of current signal
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manager for running code that must be cleaned up.
Subclass of ErrorHandler, with the same usage and parameters.
In addition to cleaning up on all signals, also cleans up on
regular exit.
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