Login

Django Online Now Users - Middleware

Author:
agusmakmun
Posted:
August 5, 2017
Language:
Python
Version:
Not specified
Score:
0 (after 0 ratings)

django online users, usage: {{ request.online_now }} or {{ request.online_now_ids }}, complete tutorial: https://python.web.id/blog/django-count-online-users/, this snippet forked from: https://gist.github.com/dfalk/1472104

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
from django.core.cache import cache
from django.conf import settings

from django.contrib.auth.models import User

ONLINE_THRESHOLD = getattr(settings, 'ONLINE_THRESHOLD', 60 * 15)
ONLINE_MAX = getattr(settings, 'ONLINE_MAX', 50)

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


class OnlineNowMiddleware(object):
    """
    Maintains a list of users who have interacted with the website recently.
    Their user IDs are available as ``online_now_ids`` on the request object,
    and their corresponding users are available (lazily) as the
    ``online_now`` property on the request object.
    """

    def process_request(self, request):
        # First get the index
        uids = cache.get('online-now', [])
        
        # Perform the multiget on the individual online 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 the user is authenticated, add their id to the list
        if request.user.is_authenticated():
            uid = request.user.id
            # If their uid is already in the list, we want to bump it
            # to the top, so we remove the 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 our 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)

More like this

  1. Template tag - list punctuation for a list of items by shapiromatron 2 months, 2 weeks ago
  2. JSONRequestMiddleware adds a .json() method to your HttpRequests by cdcarter 2 months, 3 weeks ago
  3. Serializer factory with Django Rest Framework by julio 9 months, 2 weeks ago
  4. Image compression before saving the new model / work with JPG, PNG by Schleidens 10 months, 1 week ago
  5. Help text hyperlinks by sa2812 11 months ago

Comments

Please login first before commenting.