mirror of
https://github.com/Hopiu/django-imagekit.git
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301adc2087
Changed my mind about 04aa72c1f9. It's
just a better description, even if different strategies can change the
behavior so it isn't really very cache-like.
64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
from ..utils import get_singleton
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from django.core.cache import get_cache
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from django.core.exceptions import ImproperlyConfigured
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def get_default_cachefile_backend():
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"""
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Get the default file backend.
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"""
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from django.conf import settings
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return get_singleton(settings.IMAGEKIT_DEFAULT_CACHEFILE_BACKEND,
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'file backend')
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class InvalidFileBackendError(ImproperlyConfigured):
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pass
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class CachedFileBackend(object):
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@property
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def cache(self):
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if not getattr(self, '_cache', None):
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from django.conf import settings
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self._cache = get_cache(settings.IMAGEKIT_CACHE_BACKEND)
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return self._cache
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def get_key(self, file):
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from django.conf import settings
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return '%s%s-exists' % (settings.IMAGEKIT_CACHE_PREFIX, file.name)
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def file_exists(self, file):
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key = self.get_key(file)
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exists = self.cache.get(key)
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if exists is None:
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exists = self._file_exists(file)
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self.cache.set(key, exists)
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return exists
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def ensure_exists(self, file):
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if self.file_exists(file):
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self.create(file)
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self.cache.set(self.get_key(file), True)
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class Simple(CachedFileBackend):
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"""
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The most basic file backend. The storage is consulted to see if the file
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exists.
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"""
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def _file_exists(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 create(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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file.generate(force=True)
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