mirror of
https://github.com/Hopiu/django-imagekit.git
synced 2026-04-12 01:10:58 +00:00
35b807cfa9
This way, there's a creation counterpart to `delete()`. The user shouldn't have to deal with storage backends to create and delete the files, and now they don't.
55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
from django.core.exceptions import ImproperlyConfigured
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from django.utils.importlib import import_module
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class DefaultCacheStateBackend(object):
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def is_invalid(self, file):
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if not getattr(file, '_file', None):
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# No file on object. Have to check storage.
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return not file.storage.exists(file.name)
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return False
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def validate(self, file):
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"""
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Generates a new image by running the processors on the source file.
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"""
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if self.is_invalid(file):
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file.generate(save=True)
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def invalidate(self, file):
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file.delete(save=False)
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def clear(self, file):
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file.delete(save=False)
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_default_cache_state_backend = None
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def get_default_cache_state_backend():
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"""
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Get the default cache state backend. Uses the same method as
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django.core.file.storage.get_storage_class
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"""
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global _default_cache_state_backend
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if not _default_cache_state_backend:
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from ..settings import DEFAULT_CACHE_STATE_BACKEND as import_path
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try:
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dot = import_path.rindex('.')
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except ValueError:
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raise ImproperlyConfigured("%s isn't a cache state backend module." % \
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import_path)
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module, classname = import_path[:dot], import_path[dot+1:]
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try:
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mod = import_module(module)
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except ImportError, e:
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raise ImproperlyConfigured('Error importing cache state module %s: "%s"' % (module, e))
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try:
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cls = getattr(mod, classname)
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_default_cache_state_backend = cls()
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except AttributeError:
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raise ImproperlyConfigured('Cache state backend module "%s" does not define a "%s" class.' % (module, classname))
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return _default_cache_state_backend
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