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2ca9801956
Catches memcached session key errors related to overly long session keys. This is a long-standing bug, but severity was exacerbated by the addition of cookie-backed session storage, which generates long session values. If an installation switched from cookie-backed session store to memcached, users would not be able to log in because of the server error from overly long memcached keys. git-svn-id: http://code.djangoproject.com/svn/django/trunk@17795 bcc190cf-cafb-0310-a4f2-bffc1f526a37
61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
"""
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Cached, database-backed sessions.
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"""
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from django.conf import settings
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from django.contrib.sessions.backends.db import SessionStore as DBStore
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from django.core.cache import cache
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KEY_PREFIX = "django.contrib.sessions.cached_db"
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class SessionStore(DBStore):
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"""
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Implements cached, database backed sessions.
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"""
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def __init__(self, session_key=None):
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super(SessionStore, self).__init__(session_key)
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@property
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def cache_key(self):
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return KEY_PREFIX + self._get_or_create_session_key()
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def load(self):
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try:
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data = cache.get(self.cache_key, None)
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except Exception as e:
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e_type = str(type(e))
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if e_type != "<class 'memcache.MemcachedKeyLengthError'>":
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raise e
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data = None
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if data is None:
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data = super(SessionStore, self).load()
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cache.set(self.cache_key, data, settings.SESSION_COOKIE_AGE)
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return data
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def exists(self, session_key):
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if (KEY_PREFIX + session_key) in cache:
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return True
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return super(SessionStore, self).exists(session_key)
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def save(self, must_create=False):
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super(SessionStore, self).save(must_create)
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cache.set(self.cache_key, self._session, settings.SESSION_COOKIE_AGE)
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def delete(self, session_key=None):
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super(SessionStore, self).delete(session_key)
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if session_key is None:
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if self.session_key is None:
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return
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session_key = self.session_key
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cache.delete(KEY_PREFIX + session_key)
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def flush(self):
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"""
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Removes the current session data from the database and regenerates the
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key.
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"""
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self.clear()
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self.delete(self.session_key)
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self.create()
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