我的Django项目在很大程度上依赖于会话,而Framework在此方面做得很好。它管理会话Cookie,会话数据库等,大部分通过SessionMiddleware完成。
但是有些视图明确不需要会话。这些视图通常显示为页面的条目。
我可以从创建新会话的SessionMiddleware中排除这些视图吗?如果新的(匿名)用户访问了此类视图并离开,则无需在会话表中设置Cookie或创建数据库记录。
我采用了“自适应中间件”的方式,因为看起来会话是仅在访问会话时创建的,或者(如果是全新的会话,则是在SessionMiddleware中处理响应期间创建的。)>
所以我创建了这个中间件,扩展了SessionMiddleware
:
from django.contrib.sessions.middleware import SessionMiddleware from django.http import HttpRequest class ConditionalSessionMiddleware(SessionMiddleware): def process_request(self, request: HttpRequest): # Default: We need a Session setattr(request, '_conditional_session_middleware_session_required', True) return super(ConditionalSessionMiddleware, self).process_request(request) def process_response(self, request: HttpRequest, response): # Is still a Session required? required = getattr(request, '_conditional_session_middleware_session_required', True) # or is the user not anonymous? if required or not request.user.is_anonymous: return super(ConditionalSessionMiddleware, self).process_response(request, response) else: return response
要使用它,我创建了一个简单的函数装饰器:
from types import MethodType class NoSessionUsed(object): def __init__(self, f): self.__func = f def __call__(self, instance, request: HttpRequest, *args, **kwargs): # Mark request that we don't need a session setattr(request, '_conditional_session_middleware_session_required', False) func_return = self.__func(instance, request, *args, **kwargs) return func_return def __get__(self, instance, owner): if instance: return MethodType(self, instance) else: return self
在基于类的视图中,我在
dispatch
方法上使用装饰器:
@NoSessionUsed def dispatch(self, request, *args, **kwargs): return super(ShortLinkView, self).dispatch(request, *args, **kwargs)
当然有缺点:
这可能不是完美的解决方案,但是它很简单,对我有用。