I'm reading the docs on sys.exc_info() but I can't tell for sure
whether I'm using it safely to get a snapshot of an exception and
reraise it later. The use case is a class which acts like a deferred
callable, a callable that will be called at some point in the future
(possibly in a different thread) and whose result or raised exception
is to be stored as an attribute. This will be available by calling the
result() method, which returns the original result or reraises the
exception:
class JobRequest(object):
def __init__(self, *args, **kwds):
self.args = args
self.kwds = kwds
self._exc_info = None
def __call__(self):
raise NotImplementedError('Abstract method')
def process(self):
try:
self._result = self(*self.args, **self.kwds)
except:
self._exc_info = sys.exc_info()
else:
self._exc_info = None
def result(self):
if self._exc_info is not None:
type,exception,traceback = self._exc_info
raise type,exception,traceback
try: return self._result
except AttributeError:
raise UnprocessedRequestError()
class UnprocessedRequestError(RuntimeError):
pass
So far it seems it works as expected but I'd like to know if this is
error-prone and why.
George
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