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"""
Cached, database-backed sessions.
"""
from django.conf import settings
from django.contrib.sessions.backends.db import SessionStore as DBStore
from django.core.cache import cache
KEY_PREFIX = "django.contrib.sessions.cached_db"
class SessionStore(DBStore):
"""
Implements cached, database backed sessions.
"""
def __init__(self, session_key=None):
super(SessionStore, self).__init__(session_key)
def load(self):
data = cache.get(KEY_PREFIX + self.session_key, None)
if data is None:
data = super(SessionStore, self).load()
cache.set(KEY_PREFIX + self.session_key, data,
settings.SESSION_COOKIE_AGE)
return data
def exists(self, session_key):
return super(SessionStore, self).exists(session_key)
def save(self, must_create=False):
super(SessionStore, self).save(must_create)
cache.set(KEY_PREFIX + self.session_key, self._session,
settings.SESSION_COOKIE_AGE)
def delete(self, session_key=None):
super(SessionStore, self).delete(session_key)
cache.delete(KEY_PREFIX + (session_key or self.session_key))
def flush(self):
"""
Removes the current session data from the database and regenerates the
key.
"""
self.clear()
self.delete(self.session_key)
self.create()
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