def _clean_old_sessions(self):
"""
Delete expired sessions from the datastore.
This is only called for CLEAN_CHECK_PERCENT percent of requests because
it could be rather intensive.
"""
duration = datetime.timedelta(seconds=self.session_expire_time)
session_age = datetime.datetime.now() - duration
query = UserSession.all()
query.filter("last_activity <", session_age)
results = query.fetch(1000)
for result in results:
data_query = UserSessionData.all()
query.filter("session", result)
data_results = data_query.fetch(1000)
for data_result in data_results:
data_result.delete()
memcache.delete("sid-" + str(result.key()))
result.delete()
def _get(self, keyname=None):
"""
Return all of the SessionData object unless keyname is specified, in
which case only that instance of SessionData is returned.
Important: This does not interact with memcache and pulls directly
from the datastore.
Args:
keyname: The keyname of the value you are trying to retrieve.
"""
query = UserSessionData.all()
query.filter("session", self.session)
if keyname != None:
query.filter("keyname =", keyname)
results = query.fetch(1000)
if len(results) is 0:
return None
if keyname != None:
return results[0]
return results
def delete_all_sessions(self):
"""
Deletes all sessions and session data from the data store and memcache.
"""
all_sessions_deleted = False
all_data_deleted = False
while not all_sessions_deleted:
query = UserSession.all()
results = query.fetch(1000)
if len(results) is 0:
all_sessions_deleted = True
else:
for result in results:
result.delete()
while not all_data_deleted:
query = UserSessionData.all()
results = query.fetch(1000)
if len(results) is 0:
all_data_deleted = True
else:
for result in results:
result.delete()
def _put(self, keyname, value):
"""
Insert a keyname/value pair into the datastore for the session.
Args:
keyname: The keyname of the mapping.
value: The value of the mapping.
"""
keyname = self._validate_key(keyname)
if value is None:
raise ValueError("You must pass a value to put.")
sessdata = self._get(keyname=keyname)
if sessdata is None:
sessdata = UserSessionData()
sessdata.session = self.session
sessdata.keyname = keyname
sessdata.content = pickle.dumps(value)
self.cache[keyname] = pickle.dumps(value)
sessdata.put()
self._set_memcache()
