def get_cache_key(*args, **kwargs):
# Calculating cache key based on func and arguments
md5 = cross.md5()
md5.update('%s.%s' % (func.__module__, func.__name__))
# TODO: make it more civilized
if extra is not None:
if isinstance(extra, (list, tuple)):
md5.update(':'.join(map(str, extra)))
else:
md5.update(str(extra))
if args:
md5.update(repr(args))
if kwargs:
md5.update(repr(sorted(kwargs.items())))
return 'c:%s' % md5.hexdigest()
def _cache_key(self, extra=''):
"""
Compute a cache key for this queryset
"""
md5 = cross.md5()
md5.update('%s.%s' % (self.__class__.__module__, self.__class__.__name__))
md5.update(stamp_fields(self.model)) # Protect from field list changes in model
md5.update(stringify_query(self.query))
# If query results differ depending on database
if self._cacheprofile and not self._cacheprofile['db_agnostic']:
md5.update(self.db)
if extra:
md5.update(str(extra))
# 'flat' attribute changes results formatting for ValuesQuerySet
if hasattr(self, 'flat'):
md5.update(str(self.flat))
return 'q:%s' % md5.hexdigest()
def _key_to_filename(self, key):
"""
Returns a filename corresponding to cache key
"""
digest = cross.md5(key).hexdigest()
return os.path.join(self._dir, digest[-2:], digest[:-2])
def stamp_fields(model):
"""
Returns serialized description of model fields.
"""
stamp = str([(f.name, f.attname, f.db_column, f.__class__) for f in model._meta.fields])
return cross.md5(stamp).hexdigest()
