一个不依赖于cookie的session实现

http://webpython.codepoint.net/cgi_session 里提到几种实现session id传递的方法

1) cookie2) 查询字符串 Query String SID3) 隐藏的表格域 Hidden Field SID

这个session的实现, 由应用自行选择session的生成与传递, 不会依赖于cookie

可用于webpy, bottle等wsgi框架

simplesession.py

#!/usr/bin/env python# -*- coding: utf-8 -*-import pickleimport osimport tracebackimport timeclass Session(dict):    session_path = '/dev/shm/sessions'    session_file = ''    def __init__(self, sessionid):        self.session_file = self.session_path + '/' + sessionid        try:            #Load the session variables from file            with open(self.session_file, 'rb') as fp:                session_data = pickle.load(fp)                self.update(session_data)        except (KeyboardInterrupt, SystemExit):            raise        except:            traceback.print_exc()            #If the file doesn't exist, continue with a blank session.            pass    def save(self):        #save the session variables back to file        if not os.path.exists(self.session_path):            os.makedirs()            os.chmod(self.session_path, 0660)        session_data = dict(self.items())        with open(self.session_file, 'wb') as fp:            pickle.dump(session_data, fp)    def delete(self):        self.clear()        try:            os.remove(self.session_file)        except:            traceback.print_exc()            pass    def cleanup(self, timeout):        now = time.time()        for f in os.listdir(self.session_path):            path = os.path.join(self.session_path, f)            atime = os.stat(path).st_atime            if now - atime > timeout :                os.remove(path)

testhttpserver.py

import webfrom simplesession import Sessionurls = (    "/count", "count",)app = web.application(urls, locals())class count:    def GET(self):        session = Session('5aa51234')        try:            count = session['count']        except KeyError:            count = 1        count = count + 1        session['count'] = count        session.save()        return str(count)if __name__ == "__main__":    app.run()

对于特定的手机应用, session在post数据里,要应用自己取出来