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- # -*- coding: utf-8 -*-
- """
- celery.utils.objects
- ~~~~~~~~~~~~~~~~~~~~
- Object related utilities including introspection, etc.
- """
- from __future__ import absolute_import
- __all__ = ['mro_lookup']
- def mro_lookup(cls, attr, stop=(), monkey_patched=[]):
- """Return the first node by MRO order that defines an attribute.
- :keyword stop: A list of types that if reached will stop the search.
- :keyword monkey_patched: Use one of the stop classes if the attr's
- module origin is not in this list, this to detect monkey patched
- attributes.
- :returns None: if the attribute was not found.
- """
- for node in cls.mro():
- if node in stop:
- try:
- attr = node.__dict__[attr]
- module_origin = attr.__module__
- except (AttributeError, KeyError):
- pass
- else:
- if module_origin not in monkey_patched:
- return node
- return
- if attr in node.__dict__:
- return node
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