1 # -*- coding: utf-8 -*- 2 """ 3 webapp2_extras.appengine.sessions_memcache 4 ========================================== 5 6 Extended sessions stored in memcache. 7 8 :copyright: 2011 by tipfy.org. 9 :license: Apache Sotware License, see LICENSE for details. 10 """ 11 from google.appengine.api import memcache 12 13 from webapp2_extras import sessions 14 15 16 class MemcacheSessionFactory(sessions.CustomBackendSessionFactory): 17 """A session factory that stores data serialized in memcache. 18 19 To use memcache sessions, pass this class as the `factory` keyword to 20 :meth:`webapp2_extras.sessions.SessionStore.get_session`:: 21 22 from webapp2_extras import sessions_memcache 23 24 # [...] 25 26 session = self.session_store.get_session( 27 name='mc_session', 28 factory=sessions_memcache.MemcacheSessionFactory) 29 30 See in :meth:`webapp2_extras.sessions.SessionStore` an example of how to 31 make sessions available in a :class:`webapp2.RequestHandler`. 32 """ 33 34 def _get_by_sid(self, sid): 35 """Returns a session given a session id.""" 36 if self._is_valid_sid(sid): 37 data = memcache.get(sid) 38 if data is not None: 39 self.sid = sid 40 return sessions.SessionDict(self, data=data) 41 42 self.sid = self._get_new_sid() 43 return sessions.SessionDict(self, new=True) 44 45 def save_session(self, response): 46 if self.session is None or not self.session.modified: 47 return 48 49 memcache.set(self.sid, dict(self.session)) 50 self.session_store.save_secure_cookie( 51 response, self.name, {'_sid': self.sid}, **self.session_args) 52
