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Flask SessionStore by redis with msgpack serialized

参考老外代码写了个用于Flask框架的基于redis的session实现,采用msgpack进行序列化。


# -*- coding:utf-8 -*-
"""

lib/RedisSessionStore.py
~~~~~~~~~~~~~~

Flask, session store in redis

ref by https://gist.github.com/994937

:author: linnchord@gmail.com
:date:2011-08-04

"""
import redis
from flask import Flask, request, session, json
from werkzeug.contrib.sessions import Session, SessionStore
import msgpack

class RedisSessionStore(SessionStore):

    def __init__(self, key_prefix=None, host='127.0.0.1', port=6379, dbindex=1, expire=1800):
        SessionStore.__init__(self)

        self.redis = redis.Redis(host,port,dbindex)
        self.key_prefix = key_prefix
        self.expire = expire

    def save(self,session):
        key = self._get_session_key(session.sid)
        data = msgpack.Packer().pack(dict(session))
        #print "set session {0}:{1}".format(key, data)
        self.redis.setex(key, data, self.expire)

    def delete(self, session):
        key = self._get_session_key(session.sid)
        self.redis.delete(key)

    def get(self, sid):
        key = self._get_session_key(sid)
        data = self.redis.get(key)
        if data is not None:
            self.redis.setex(key, data, self.expire)
            un = msgpack.Unpacker()
            un.feed(data)
            data = un.unpack()
        else:
            data = {}

        return self.session_class(data, sid, False)


    def _get_session_key(self,sid):
        key = self.key_prefix + sid
        if isinstance(key, unicode):
          key = key.encode('utf-8')
        return key

    
    @staticmethod
    def init_app(app):
        app.session_store = RedisSessionStore(
            app.config['SESSION_KEY_PREFIX'],
            app.config['SESSION_REDIS_HOST'],
            app.config['SESSION_REDIS_PORT'],
            app.config['SESSION_REDIS_DB'],
            app.config['SESSION_LIFETIME']
        )
        app.session_key = app.config['SESSION_KEY']
    

class SessionMixin(object):

  __slots__ = ('session_key', 'session_store')

  def open_session(self, request):
    sid = request.cookies.get(self.session_key, None)
    if sid is None:
        return self.session_store.new()
    else:
        return self.session_store.get(sid)

  def save_session(self, session, response):
    if session.should_save:
        self.session_store.save(session)
        response.set_cookie(self.session_key, session.sid)
    return response


class MyFlask(SessionMixin, Flask): pass

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

HOW TO USE

app = MyFlask(__name__)
RedisSessionStore.init_app(app)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

APP CONFIG:

SESSION_REDIS_HOST = '127.0.0.1'
SESSION_REDIS_PORT = 6379
SESSION_REDIS_DB = 1

SESSION_KEY = '_myapp_sid'
SESSION_KEY_PREFIX = 'session_myapp_'

SESSION_LIFETIME = 900

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