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- # -*- coding: utf-8 -*-
- """
- celery.app.annotations
- ~~~~~~~~~~~~~~~~~~~~~~
-
- Annotations is a nice term for monkey patching
- task classes in the configuration.
-
- This prepares and performs the annotations in the
- :setting:`CELERY_ANNOTATIONS` setting.
-
- """
- from __future__ import absolute_import
-
- from celery.five import string_t
- from celery.utils.functional import firstmethod, mlazy
- from celery.utils.imports import instantiate
-
- _first_match = firstmethod('annotate')
- _first_match_any = firstmethod('annotate_any')
-
- __all__ = ['MapAnnotation', 'prepare', 'resolve_all']
-
-
- class MapAnnotation(dict):
-
- def annotate_any(self):
- try:
- return dict(self['*'])
- except KeyError:
- pass
-
- def annotate(self, task):
- try:
- return dict(self[task.name])
- except KeyError:
- pass
-
-
- def prepare(annotations):
- """Expands the :setting:`CELERY_ANNOTATIONS` setting."""
-
- def expand_annotation(annotation):
- if isinstance(annotation, dict):
- return MapAnnotation(annotation)
- elif isinstance(annotation, string_t):
- return mlazy(instantiate, annotation)
- return annotation
-
- if annotations is None:
- return ()
- elif not isinstance(annotations, (list, tuple)):
- annotations = (annotations, )
- return [expand_annotation(anno) for anno in annotations]
-
-
- def resolve_all(anno, task):
- return (x for x in (_first_match(anno, task), _first_match_any(anno)) if x)
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