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from django.core.cache import cache 

from django.conf import settings 

from django.utils import importlib 

from django.core.exceptions import ImproperlyConfigured 

import hashlib 

import time 

import six 

 

 

class BaseRosettaStorage(object): 

    def __init__(self, request): 

        self.request = request 

 

    def get(self, key, default=None): 

        raise NotImplementedError 

 

    def set(self, key, val): 

        raise NotImplementedError 

 

    def has(self, key): 

        raise NotImplementedError 

 

    def delete(self, key): 

        raise NotImplementedError 

 

 

class DummyRosettaStorage(BaseRosettaStorage): 

    def get(self, key, default=None): 

        return default 

 

    def set(self, key, val): 

        pass 

 

    def has(self, key): 

        return False 

 

    def delete(self, key): 

        pass 

 

 

class SessionRosettaStorage(BaseRosettaStorage): 

    def get(self, key, default=None): 

        if key in self.request.session: 

            return self.request.session[key] 

        return default 

 

    def set(self, key, val): 

        self.request.session[key] = val 

 

    def has(self, key): 

        return key in self.request.session 

 

    def delete(self, key): 

        del(self.request.session[key]) 

 

 

class CacheRosettaStorage(BaseRosettaStorage): 

    # unlike the session storage backend, cache is shared among all users 

    # so we need to per-user key prefix, which we store in the session 

    def __init__(self, request): 

        super(CacheRosettaStorage, self).__init__(request) 

 

        if 'rosetta_cache_storage_key_prefix' in self.request.session: 

            self._key_prefix = self.request.session['rosetta_cache_storage_key_prefix'] 

        else: 

            self._key_prefix = hashlib.new('sha1', six.text_type(time.time()).encode('utf8')).hexdigest() 

            self.request.session['rosetta_cache_storage_key_prefix'] = self._key_prefix 

 

70        if self.request.session['rosetta_cache_storage_key_prefix'] != self._key_prefix: 

            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.") 

 

        # Make sure we're not using DummyCache 

74        if 'dummycache' in settings.CACHES['default']['BACKEND'].lower(): 

            raise ImproperlyConfigured("You can't use the CacheRosettaStorage if your cache isn't correctly set up (you are use the DummyCache cache backend).") 

 

        # Make sure the actually actually works 

        try: 

            self.set('rosetta_cache_test', 'rosetta') 

80            if not self.get('rosetta_cache_test') == 'rosetta': 

                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.") 

        finally: 

            self.delete('rosetta_cache_test') 

 

    def get(self, key, default=None): 

        #print ('get', self._key_prefix + key) 

        return cache.get(self._key_prefix + key, default) 

 

    def set(self, key, val): 

        #print ('set', self._key_prefix + key) 

        cache.set(self._key_prefix + key, val, 86400) 

 

    def has(self, key): 

        #print ('has', self._key_prefix + key) 

        return (self._key_prefix + key) in cache 

 

    def delete(self, key): 

        #print ('del', self._key_prefix + key) 

        cache.delete(self._key_prefix + key) 

 

 

def get_storage(request): 

    from rosetta.conf import settings 

    storage_module, storage_class = settings.STORAGE_CLASS.rsplit('.', 1) 

    storage_module = importlib.import_module(storage_module) 

    return getattr(storage_module, storage_class)(request)