Question

我正在研究django1.10的宠物项目，尝试使用频道。我有一个中间件，我想导入并挂钩到myapp.I想要＆＃39; ip＆＃39;，＆＃39; user_agent＆＃39; ＆＃39; session_key可以＆＃39;从中间件挂钩到我的channel / sessions.py的参数。由于我还在掌握python和django，我非常感谢有关如何将我的中间件类SessionMiddleware挂钩到我的channels / sessions.py的任何帮助。

中间件的相关代码是：

class SessionMiddleware(MiddlewareMixin):
    """
    Middleware that provides ip and user_agent to the session store.
    """
    def process_request(self, request):
        engine = import_module(settings.SESSION_ENGINE)
        session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME, None)
        request.session = engine.SessionStore(
            ip=request.META.get('REMOTE_ADDR', ''),
            user_agent=request.META.get('HTTP_USER_AGENT', ''),
            session_key=session_key
        )

channels / sessions.py是：

def inner(message, *args, **kwargs):
        # Make sure there's NOT a http_session already
        if hasattr(message, "http_session"):
            return func(message, *args, **kwargs)
        try:
            # We want to parse the WebSocket (or similar HTTP-lite) message
            # to get cookies and GET, but we need to add in a few things that
            # might not have been there.
            if "method" not in message.content:
                message.content['method'] = "FAKE"
            request = AsgiRequest(message)
        except Exception as e:
            raise ValueError("Cannot parse HTTP message - are you sure this is a HTTP consumer? %s" % e)
        # Make sure there's a session key
        session_key = request.GET.get("session_key", None)

        if session_key is None:
            session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME, None)
        # Make a session storage

        if session_key:
            session_engine = import_module(settings.SESSION_ENGINE)
            session = session_engine.SessionStore(session_key=session_key,user_agent=user_agent,ip=ip)
        else:
            session = None
        message.http_session = session
        # Run the consumer
        result = func(message, *args, **kwargs)
        # Persist session if needed (won't be saved if error happens)
        if session is not None and session.modified:
            session.save()
        return result
    return inner

这个问题可能很简单，需要理解基本的python类/函数import.I能够导入模块和类SessionMiddleware;我试图定义＆＃39; ip＆＃39;，＆＃39; user_agent＆＃39 ;和＆＃39; session_key＆＃39;作为channels / sessions.py中的全局变量（可能因为我收到错误而遗漏了一些东西）：

NameError：name＆＃39; user_agent＆＃39;没有定义。

`当我尝试在#Make中的if语句中分配＆＃39; session＆＃39;在channels / sessions.py中的会话存储：

session = session_engine.SessionStore（session_key = session_key，user_agent = user_agent，ip = ip）

我很难理解以下内容： 1.什么是pythonic方式来呼叫＆＃39; ip＆＃39;，＆＃39; user_agent＆＃39;和＆＃39; session_key＆＃39;我的channels / sessions.py的参数。 2.如何使这些参数在channels / sessions.py中具有全局范围。

如何在另一个（导入的）中间件类的方法中调用和定义变量？

0 个答案: