判断登陆状态的装饰器

# 判断登陆状态装饰器
def check_login(fn):
    '''校验登陆状态的装饰器'''
    def wrap(request,*args,**kwargs):
        if 'username' not in request.session or 'userid' not in request.session:
            c_username = request.COOKIES.get(('username'))
            c_userid = request.COOKIES.get(('userid'))
            if not c_username and not c_userid:
                return HttpResponseRedirect('/user/login/')
            else:
                # 如果有，回写session
                request.session['username'] = c_username
                request.session['userid'] = c_userid
        return fn(request,*args,**kwargs)
    return wrap