def query_memcache(key):
"""Check if cached permissions are available
Args:
key (string): key of the stored permissions
Returns:
cache (memcache_client): memcache client or None if caching
is not available
permissions_cache (dict): dict with all permissions or None if there
was a cache miss
"""
if not getattr(settings, 'MEMCACHE_MECHANISM', False):
return None, None
cache = _get_cache_manager().cache_object.memcache_client
cached_keys_set = cache.get('permissions:list') or set()
if key not in cached_keys_set:
# We set the permissions:list variable so that we are able to batch
# remove all permissions related keys from memcache
cached_keys_set.add(key)
cache.set('permissions:list', cached_keys_set,
PERMISSION_CACHE_TIMEOUT)
return cache, None
permissions_cache = cache.get(key)
if permissions_cache:
# If the key is both in permissions:list and in memcache itself
# it is safe to return the cached permissions
return cache, permissions_cache
return cache, None
def query_memcache(key):
"""Check if cached permissions are available
Args:
key (string): key of the stored permissions
Returns:
cache (memcache_client): memcache client or None if caching
is not available
permissions_cache (dict): dict with all permissions or None if there
was a cache miss
"""
if not getattr(settings, 'MEMCACHE_MECHANISM', False):
return None, None
cache = _get_cache_manager().cache_object.memcache_client
cached_keys_set = cache.get('permissions:list') or set()
if key not in cached_keys_set:
# We set the permissions:list variable so that we are able to batch
# remove all permissions related keys from memcache
cached_keys_set.add(key)
cache.set('permissions:list', cached_keys_set, PERMISSION_CACHE_TIMEOUT)
return cache, None
permissions_cache = cache.get(key)
if permissions_cache:
# If the key is both in permissions:list and in memcache itself
# it is safe to return the cached permissions
return cache, permissions_cache
return cache, None
