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annotate gpp/forums/middleware.py @ 197:2baadae33f2e

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Got autocomplete working for the member search. Updated django and ran into a bug where url tags with comma separated kwargs starting consuming tons of CPU throughput. The work-around is to cut over to using spaces between arguments. This is now allowed to be consistent with other tags. Did some query optimization for the news app.
author Brian Neal <bgneal@gmail.com>
date Sat, 10 Apr 2010 04:32:24 +0000
parents 2eb3984ccb15
children
rev   line source
bgneal@160 1 """
bgneal@160 2 Middleware for the forums application.
bgneal@160 3 """
bgneal@160 4 import datetime
bgneal@160 5
bgneal@160 6 from django.core.cache import cache
bgneal@160 7 from django.conf import settings
bgneal@160 8
bgneal@160 9
bgneal@160 10 USER_ONLINE_TIMEOUT = datetime.timedelta(minutes=15)
bgneal@160 11 USERS_ONLINE_KEY = 'users_online'
bgneal@160 12 GUESTS_ONLINE_KEY = 'guests_online'
bgneal@160 13 USERS_CACHE_TIMEOUT = 60 * 60 * 24 # units are seconds
bgneal@160 14
bgneal@160 15
bgneal@160 16 class WhosOnline(object):
bgneal@160 17 """
bgneal@160 18 This middleware class keeps track of which registered users have
bgneal@160 19 been seen recently, and the number of unique unregistered users.
bgneal@160 20 We use the Django cache system to store this information.
bgneal@160 21 This middleware should come after the authentication middleware,
bgneal@160 22 as we count on the user attribute being attached to the request.
bgneal@160 23 """
bgneal@160 24
bgneal@160 25 def process_request(self, request):
bgneal@160 26 """
bgneal@160 27 Keep track of who is online.
bgneal@160 28 """
bgneal@160 29 now = datetime.datetime.now()
bgneal@160 30 cutoff = now - USER_ONLINE_TIMEOUT
bgneal@160 31 users_online = cache.get(USERS_ONLINE_KEY, {})
bgneal@160 32 guests_online = cache.get(GUESTS_ONLINE_KEY, {})
bgneal@160 33
bgneal@160 34 # update timestamp for user
bgneal@160 35 if request.user.is_authenticated():
bgneal@160 36 users_online[request.user.username] = now
bgneal@160 37 else:
bgneal@160 38 sid = request.COOKIES.get(settings.SESSION_COOKIE_NAME, '')
bgneal@160 39 guests_online[sid] = now
bgneal@160 40
bgneal@160 41 # expire old records
bgneal@160 42 for username, timestamp in users_online.items():
bgneal@160 43 if timestamp < cutoff:
bgneal@160 44 del users_online[username]
bgneal@160 45
bgneal@160 46 for sid, timestamp in guests_online.items():
bgneal@160 47 if timestamp < cutoff:
bgneal@160 48 del guests_online[sid]
bgneal@160 49
bgneal@160 50 cache.set(USERS_ONLINE_KEY, users_online, USERS_CACHE_TIMEOUT)
bgneal@160 51 cache.set(GUESTS_ONLINE_KEY, guests_online, USERS_CACHE_TIMEOUT)