mirror of
https://github.com/Hopiu/django-rosetta.git
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118 lines
4.1 KiB
Python
118 lines
4.1 KiB
Python
import hashlib
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import importlib
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import time
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from django.conf import settings
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from django.core.cache import caches
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from django.core.exceptions import ImproperlyConfigured
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import six
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from .conf import settings as rosetta_settings
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cache = caches[rosetta_settings.ROSETTA_CACHE_NAME]
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class BaseRosettaStorage(object):
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def __init__(self, request):
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self.request = request
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def get(self, key, default=None):
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raise NotImplementedError
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def set(self, key, val):
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raise NotImplementedError
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def has(self, key):
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raise NotImplementedError
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def delete(self, key):
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raise NotImplementedError
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class DummyRosettaStorage(BaseRosettaStorage):
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def get(self, key, default=None):
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return default
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def set(self, key, val):
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pass
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def has(self, key):
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return False
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def delete(self, key):
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pass
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class SessionRosettaStorage(BaseRosettaStorage):
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def __init__(self, request):
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super(SessionRosettaStorage, self).__init__(request)
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if 'signed_cookies' in settings.SESSION_ENGINE and 'pickle' not in settings.SESSION_SERIALIZER.lower():
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raise ImproperlyConfigured("Sorry, but django-rosetta doesn't support the `signed_cookies` SESSION_ENGINE, because rosetta specific session files cannot be serialized.")
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def get(self, key, default=None):
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if key in self.request.session:
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return self.request.session[key]
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return default
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def set(self, key, val):
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self.request.session[key] = val
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def has(self, key):
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return key in self.request.session
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def delete(self, key):
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del(self.request.session[key])
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class CacheRosettaStorage(BaseRosettaStorage):
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# unlike the session storage backend, cache is shared among all users
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# so we need to per-user key prefix, which we store in the session
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def __init__(self, request):
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super(CacheRosettaStorage, self).__init__(request)
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if 'rosetta_cache_storage_key_prefix' in self.request.session:
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self._key_prefix = self.request.session['rosetta_cache_storage_key_prefix']
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else:
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self._key_prefix = hashlib.new('sha1', six.text_type(time.time()).encode('utf8')).hexdigest()
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self.request.session['rosetta_cache_storage_key_prefix'] = self._key_prefix
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if self.request.session['rosetta_cache_storage_key_prefix'] != self._key_prefix:
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raise ImproperlyConfigured("You can't use the CacheRosettaStorage because your Django Session storage doesn't seem to be working. The CacheRosettaStorage relies on the Django Session storage to avoid conflicts.")
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# Make sure we're not using DummyCache
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if 'dummycache' in settings.CACHES[rosetta_settings.ROSETTA_CACHE_NAME]['BACKEND'].lower():
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raise ImproperlyConfigured("You can't use the CacheRosettaStorage if your cache isn't correctly set up (you are using the DummyCache cache backend).")
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# Make sure the cache actually works
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try:
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self.set('rosetta_cache_test', 'rosetta')
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if not self.get('rosetta_cache_test') == 'rosetta':
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raise ImproperlyConfigured("You can't use the CacheRosettaStorage if your cache isn't correctly set up, please double check your Django DATABASES setting and that the cache server is responding.")
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finally:
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self.delete('rosetta_cache_test')
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def get(self, key, default=None):
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# print ('get', self._key_prefix + key)
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return cache.get(self._key_prefix + key, default)
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def set(self, key, val):
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# print ('set', self._key_prefix + key)
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cache.set(self._key_prefix + key, val, 86400)
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def has(self, key):
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# print ('has', self._key_prefix + key)
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return (self._key_prefix + key) in cache
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def delete(self, key):
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# print ('del', self._key_prefix + key)
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cache.delete(self._key_prefix + key)
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def get_storage(request):
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from rosetta.conf import settings
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storage_module, storage_class = settings.STORAGE_CLASS.rsplit('.', 1)
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storage_module = importlib.import_module(storage_module)
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return getattr(storage_module, storage_class)(request)
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