realms-wiki/reimagine/session.py

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2013-09-26 16:51:15 +03:00
import pickle
from datetime import timedelta
from uuid import uuid4
from redis import Redis
from werkzeug.datastructures import CallbackDict
from flask.sessions import SessionInterface, SessionMixin
class RedisSession(CallbackDict, SessionMixin):
def __init__(self, initial=None, sid=None, new=False):
def on_update(self):
self.modified = True
CallbackDict.__init__(self, initial, on_update)
self.sid = sid
self.new = new
self.modified = False
class RedisSessionInterface(SessionInterface):
serializer = pickle
session_class = RedisSession
def __init__(self, redis=None, prefix='session:'):
if redis is None:
redis = Redis()
self.redis = redis
self.prefix = prefix
def generate_sid(self):
return str(uuid4())
def get_redis_expiration_time(self, app, session):
if session.permanent:
return app.permanent_session_lifetime
return timedelta(days=1)
def open_session(self, app, request):
sid = request.cookies.get(app.session_cookie_name)
if not sid:
sid = self.generate_sid()
return self.session_class(sid=sid)
val = self.redis.get(self.prefix + sid)
if val is not None:
data = self.serializer.loads(val)
return self.session_class(data, sid=sid)
return self.session_class(sid=sid, new=True)
def save_session(self, app, session, response):
domain = self.get_cookie_domain(app)
if not session:
self.redis.delete(self.prefix + session.sid)
if session.modified:
response.delete_cookie(app.session_cookie_name,
domain=domain)
return
redis_exp = self.get_redis_expiration_time(app, session)
cookie_exp = self.get_expiration_time(app, session)
val = self.serializer.dumps(dict(session))
self.redis.setex(self.prefix + session.sid, val,
int(redis_exp.total_seconds()))
response.set_cookie(app.session_cookie_name, session.sid,
expires=cookie_exp, httponly=True,
domain=domain)