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web: gunicorn carpool.wsgi |
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from django.core.cache import cache | ||
from django.conf import settings | ||
from django.contrib.auth.models import User | ||
from django.utils.deprecation import MiddlewareMixin | ||
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ONLINE_THRESHOLD = getattr(settings, 'ONLINE_THRESHOLD', 60 * 15) | ||
ONLINE_MAX = getattr(settings, 'ONLINE_MAX', 50) | ||
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def get_online_now(self): | ||
return User.objects.filter(id__in=self.online_now_ids or []) | ||
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class OnlineNowMiddleware(MiddlewareMixin): | ||
""" | ||
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. | ||
""" | ||
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def process_request(self, request): | ||
# First get the index | ||
uids = cache.get('online-now', []) | ||
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# 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] | ||
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# 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] | ||
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# Attach our modifications to the request object | ||
request.__class__.online_now_ids = online_now_ids | ||
request.__class__.online_now = property(get_online_now) | ||
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# Set the new cache | ||
cache.set('online-%s' % (request.user.pk,), True, ONLINE_THRESHOLD) | ||
cache.set('online-now', online_now_ids, ONLINE_THRESHOLD) |
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