def _get_session(self, session_id):
"""Return the Quixote Session with given id, or None."""
session_mgr = get_session_manager()
try:
session = session_mgr[session_id]
except KeyError:
session = None
return session
def expire_sessions():
"""Expire user sessions."""
expired_count = get_session_manager().del_sessions(
age=SESSION_EXPIRE_HOURS)
if expired_count:
transaction_commit(None, 'ExpireSessions')