python---session(tornado中使用)缓存

# coding:utf8
# __author:  Administrator
# date:      2018/3/17 0017
# /usr/bin/env python
import config
import hashlib
import time

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



class MemerySession:
    container = {}
    prex_str="py_session"

    def __init__(self,handler):
        self.handler = handler
        client_random_str = handler.get_cookie(MemerySession.prex_str,None)
        if client_random_str and client_random_str in MemerySession.container:
            self.random_str=client_random_str
        else:
            self.random_str = self.__genarate_random_str()
            MemerySession.container[self.random_str]={}
        expires_time =  time.time() + config.SESSION_EXPIRE
        handler.set_cookie(MemerySession.prex_str,self.random_str,expires=expires_time)

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

    def __setitem__(self, key, value):
        MemerySession.container[self.random_str][key]=value

    def __getitem__(self, key):
        ret = MemerySession.container[self.random_str].get(key, None)
        return ret


class RedisSession:
    pass

class FileSession:
    pass

class MysqlSession:
    pass

import tornado.web
from backend.session.session import BaseSession

class BaseRequestHandler(tornado.web.RequestHandler):
    def initialize(self):
        self.session = BaseSession.get_session_handler(self)

class LoginHandler(BaseRequestHandler):
    def get(self):
        pass

    def post(self):
            #验证成功，缓存信息
            self.session[‘username‘] = ret.username
            self.session[‘email‘] = ret.email