python---redis实现自定义session

SESSION_EXPIRE = 60

SESSION_TYPE = ‘Redis‘

pool = redis.ConnectionPool(host="localhost",port=6379)
redi_conn = redis.Redis(connection_pool=pool)

class BaseSession:
    @classmethod
    def get_session_handler(cls,handler):
        if config.SESSION_TYPE == "Memery":
            obj = MemerySession(handler)
        elif config.SESSION_TYPE == "Mamcache":
            obj = MemcacheSession(handler)
        elif config.SESSION_TYPE == "Redis":
            obj = RedisSession(handler)
        return obj

class RedisSession:
    session_id = "py_session"

    def __init__(self,handler):
        self.handler = handler
        #从客户端获取随机字符串
        client_random_str = self.handler.get_cookie(MemcacheSession.session_id)
        #如果获取到了字符串
        if client_random_str and redi_conn.exists(client_random_str):
            self.random_str = client_random_str
        else:
            self.random_str = self.__genarate_random_str()
            redi_conn.hset(self.random_str,None,None)
        redi_conn.expire(self.random_str,config.SESSION_EXPIRE)
        expires_time = time.time() + config.SESSION_EXPIRE
        handler.set_cookie(MemerySession.prex_str, self.random_str, expires=expires_time)

    def __setitem__(self, key, value):
        redi_conn.hget(self.random_str,key)
        redi_conn.hset(self.random_str, key,value)
        redi_conn.expire(self.random_str, config.SESSION_EXPIRE)

    def __getitem__(self, item):
        ret = redi_conn.hget(self.random_str,item)
        return ret

    def __delitem__(self, key):
        redi_conn.hdel(self.random_str,key)
        redi_conn.expire(self.random_str, config.SESSION_EXPIRE)

    def __genarate_random_str(self):
        obj = hashlib.md5()
        obj.update(bytes(str(time.time()),encoding="utf8"))
        random_str=obj.hexdigest()
        return random_str

　　　　　　if str(self.session[‘code‘].lower(),encoding="utf8") != self.get_argument(‘code‘).lower():
                status[‘status‘] = False
                status[‘error‘] = "验证码错误"