def process_request(self, request):

        request.horizon = {'dashboard': None,
                           'panel': None,
                           'async_messages': []}
        if not hasattr(request, "user") or not request.user.is_authenticated():
            # proceed no further if the current request is already known
            # not to be authenticated
            # it is CRITICAL to perform this check as early as possible
            # to avoid creating too many sessions
            return None

        if request.is_ajax():
            # if the request is Ajax we do not want to proceed, as clients can
            #  1) create pages with constant polling, which can create race
            #     conditions when a page navigation occurs
            #  2) might leave a user seemingly left logged in forever
            #  3) thrashes db backed session engines with tons of changes
            return None
        # If we use cookie-based sessions, check that the cookie size does not
        # reach the max size accepted by common web browsers.
        if (
            settings.SESSION_ENGINE ==
            'django.contrib.sessions.backends.signed_cookies'
        ):
            max_cookie_size = getattr(
                settings, 'SESSION_COOKIE_MAX_SIZE', None)
            session_cookie_name = getattr(
                settings, 'SESSION_COOKIE_NAME', None)
            session_key = request.COOKIES.get(session_cookie_name)
            if max_cookie_size is not None and session_key is not None:
                cookie_size = sum((
                    len(key) + len(value)
                    for key, value in six.iteritems(request.COOKIES)
                ))
                if cookie_size >= max_cookie_size:
                    LOG.error(
                        'Total Cookie size for user_id: %(user_id)s is '
                        '%(cookie_size)sB >= %(max_cookie_size)sB. '
                        'You need to configure file-based or database-backed '
                        'sessions instead of cookie-based sessions: '
                        'http://docs.openstack.org/developer/horizon/topics/'
                        'deployment.html#session-storage'
                        % {
                            'user_id': request.session.get(
                                'user_id', 'Unknown'),
                            'cookie_size': cookie_size,
                            'max_cookie_size': max_cookie_size,
                        }
                    )

        tz = request.session.get('django_timezone')
        if tz:
            timezone.activate(tz)
Stop monitoring the given L{FileDescriptor} for writing.
dataset/ETHPy150Open openstack/horizon/horizon/middleware.py/HorizonMiddleware.process_request--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/internet/gtk2reactor.py/Gtk2Reactor.removeWriter