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@@ -1,117 +0,0 @@
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-import operator
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-try:
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- import cPickle as pickle
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-except ImportError:
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- import pickle
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-
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-from celery.utils.functional import curry
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-
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-
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-def find_nearest_pickleable_exception(exc):
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- """With an exception instance, iterate over its super classes (by mro)
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- and find the first super exception that is pickleable. It does
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- not go below :exc:`Exception` (i.e. it skips :exc:`Exception`,
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- :class:`BaseException` and :class:`object`). If that happens
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- you should use :exc:`UnpickleableException` instead.
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-
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- :param exc: An exception instance.
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-
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- :returns: the nearest exception if it's not :exc:`Exception` or below,
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- if it is it returns ``None``.
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-
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- :rtype: :exc:`Exception`
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-
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- """
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-
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- unwanted = (Exception, BaseException, object)
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- is_unwanted = lambda exc: any(map(curry(operator.is_, exc), unwanted))
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-
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- mro_ = getattr(exc.__class__, "mro", lambda: [])
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- for supercls in mro_():
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- if is_unwanted(supercls):
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- # only BaseException and object, from here on down,
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- # we don't care about these.
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- return None
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- try:
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- exc_args = getattr(exc, "args", [])
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- superexc = supercls(*exc_args)
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- pickle.dumps(superexc)
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- except:
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- pass
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- else:
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- return superexc
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- return None
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-
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-
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-def create_exception_cls(name, module, parent=None):
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- """Dynamically create an exception class."""
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- if not parent:
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- parent = Exception
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- return type(name, (parent, ), {"__module__": module})
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-
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-
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-class UnpickleableExceptionWrapper(Exception):
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- """Wraps unpickleable exceptions.
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-
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- :param exc_module: see :attr:`exc_module`.
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-
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- :param exc_cls_name: see :attr:`exc_cls_name`.
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-
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- :param exc_args: see :attr:`exc_args`
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-
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- .. attribute:: exc_module
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-
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- The module of the original exception.
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-
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- .. attribute:: exc_cls_name
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-
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- The name of the original exception class.
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-
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- .. attribute:: exc_args
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-
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- The arguments for the original exception.
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-
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- Example
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-
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- >>> try:
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- ... something_raising_unpickleable_exc()
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- >>> except Exception, e:
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- ... exc = UnpickleableException(e.__class__.__module__,
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- ... e.__class__.__name__,
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- ... e.args)
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- ... pickle.dumps(exc) # Works fine.
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-
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- """
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-
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- def __init__(self, exc_module, exc_cls_name, exc_args):
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- self.exc_module = exc_module
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- self.exc_cls_name = exc_cls_name
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- self.exc_args = exc_args
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- super(Exception, self).__init__(exc_module, exc_cls_name, exc_args)
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-
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-
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-def get_pickleable_exception(exc):
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- """Make sure exception is pickleable."""
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- nearest = find_nearest_pickleable_exception(exc)
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- if nearest:
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- return nearest
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-
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- try:
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- pickle.dumps(exc)
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- except pickle.PickleError:
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- excwrapper = UnpickleableExceptionWrapper(
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- exc.__class__.__module__,
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- exc.__class__.__name__,
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- getattr(exc, "args", []))
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- return excwrapper
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- return exc
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-
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-
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-def get_pickled_exception(exc):
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- """Get original exception from exception pickled using
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- :meth:`get_pickleable_exception`."""
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- if isinstance(exc, UnpickleableExceptionWrapper):
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- exc_cls = create_exception_cls(exc.exc_cls_name,
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- exc.exc_module)
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- return exc_cls(*exc.exc_args)
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- return exc
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