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#!/usr/bin/python
#
# Copyright (C) 2014 Ipsilon project Contributors, for licensee see COPYING
import base64
from cherrypy.lib.sessions import Session
from ipsilon.util.data import SqlStore, SqlQuery
import threading
try:
import cPickle as pickle
except ImportError:
import pickle
SESSION_COLUMNS = ['id', 'data', 'expiration_time']
class SqlSession(Session):
dburi = None
_db = None
_proto = 2
locks = {}
@classmethod
def setup(cls, **kwargs):
"""Initialization from cherrypy"""
for k, v in kwargs.items():
if k == 'storage_dburi':
cls.dburi = v
cls._db = SqlStore(cls.dburi)
def _exists(self):
q = SqlQuery(self._db, 'sessions', SESSION_COLUMNS)
result = q.select({'id': self.id})
return True if result.fetchone() else False
def _load(self):
q = SqlQuery(self._db, 'sessions', SESSION_COLUMNS)
result = q.select({'id': self.id})
r = result.fetchone()
if r:
data = str(base64.b64decode(r[1]))
return pickle.loads(data)
def _save(self, expiration_time):
q = None
try:
q = SqlQuery(self._db, 'sessions', SESSION_COLUMNS, trans=True)
q.delete({'id': self.id})
data = pickle.dumps((self._data, expiration_time), self._proto)
q.insert((self.id, base64.b64encode(data), expiration_time))
q.commit()
except Exception: # pylint: disable=broad-except
if q:
q.rollback()
raise
def _delete(self):
q = SqlQuery(self._db, 'sessions', SESSION_COLUMNS)
q.delete({'id': self.id})
# copy what RamSession does for now
def acquire_lock(self):
"""Acquire an exclusive lock on the currently-loaded session data."""
self.locked = True
self.locks.setdefault(self.id, threading.RLock()).acquire()
def release_lock(self):
"""Release the lock on the currently-loaded session data."""
self.locks[self.id].release()
self.locked = False
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