如何在用户使用中间件注销时将其删除

Question

我正在使用下面的中间件生成当前登录用户的列表。我遇到的问题是如何在用户注销后自动从online_now和online_now_ids中删除用户。我已经尝试使用信号，但没有success...any的帮助，非常感谢

from django.core.cache import cache
from django.conf import settings
from django.contrib.auth.models import User
from django.utils.deprecation import MiddlewareMixin
from django.dispatch import receiver
from django.contrib.auth.signals import user_logged_out
#Set Environment variables for settings.py

ONLINE_THRESHOLD = getattr(settings, 'ONLINE_THRESHOLD', 30*1)
ONLINE_MAX = getattr(settings, 'ONLINE_MAX', 50)
CACHE_MIDDLEWARE_SECONDS = getattr(settings, 'CACHE_MIDDLEWARE_SECONDS', 10)

def get_online_now(self):
    return User.objects.filter(id__in=self.online_now_ids or [])


class OnlineNowMiddleware(MiddlewareMixin):
    """
    Maintains a list of users who logged into the website.
    User ID's are available as `online_now_ids` on the request object,
    and their corresponding users are available lazzily as the `online_now`
    property on the request object
    """

    def process_request(self, request):
        #Get the index 
        uids = cache.get('online-now', [])

        #multiget on individual uid keys

        online_keys = ['online-%s' % (u,) for u in uids]
        fresh = cache.get_many(online_keys).keys()
        online_now_ids = [int(k.replace('online-','')) for k in fresh]

        #if user is authenticated add id to list
        if request.user.is_authenticated():
            uid = request.user.id
            #if uid in list bump to top
            # and remove earlier entry

            if uid in online_now_ids:
                online_now_ids.remove(uid)
            online_now_ids.append(uid)
            if len(online_now_ids) > ONLINE_MAX:
                del online_now_ids[0]


        #Attach modifications to the request object
        request.__class__.online_now_ids = online_now_ids
        request.__class__.online_now = property(get_online_now)

        #Set the new cache

        cache.set('online-%s' % (request.user.pk), True, ONLINE_THRESHOLD)
        cache.set('online-now', online_now_ids, ONLINE_THRESHOLD)

Answer 1

您可以使用套接字来实现这一点，否则它不会真正向online用户显示。

如果没有套接字，它就不会那么准确，但以下是您可以在步骤中完成的操作：

• 为用户创建最后一个活动(日期时间)字段。(无论您希望以何种方式存储此relationship)
• In，请更改代码以更新用户的OneOnOne字段。

如果user_activity.save() ()：request.user.is_authenticated()：user_activity，c=user_activity user_activity.last_activity = timezone.now()

这就是你所需要的。

查询在线用户(不是精确查询，只是示例)：

User.objects.filter(activities__last_activity__gte=timezone.now() - timedelta(seconds=30))