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annotate gpp/core/middleware.py @ 370:e9a066db3f54

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Adding some try/except around some key points in the code to protect against some IntegrityErrors. We log when these happens but otherwise keep going. Tickets: #160 and #169.
author Brian Neal <bgneal@gmail.com>
date Sun, 06 Mar 2011 00:40:50 +0000
parents a2d388ed106e
children 3fe60148f75c
rev   line source
bgneal@215 1 """Common middleware for the entire project."""
bgneal@227 2 import datetime
bgneal@370 3 import logging
bgneal@227 4
bgneal@370 5 from django.db import IntegrityError
bgneal@215 6 from django.contrib.auth import logout
bgneal@227 7 from django.conf import settings
bgneal@227 8
bgneal@227 9 from core.models import UserLastVisit
bgneal@227 10 from core.models import AnonLastVisit
bgneal@227 11 from core.functions import get_ip
bgneal@227 12
bgneal@215 13
bgneal@215 14 class InactiveUserMiddleware(object):
bgneal@215 15 """
bgneal@215 16 This middleware ensures users with is_active set to False get their
bgneal@215 17 session destroyed and are treated as logged out.
bgneal@215 18 This middleware should come after the 'django.contrib.auth.middleware.
bgneal@215 19 AuthenticationMiddleware' in settings.py.
bgneal@215 20 Idea taken from: http://djangosnippets.org/snippets/1105/
bgneal@215 21 """
bgneal@215 22
bgneal@227 23 def process_view(self, request, view_func, view_args, view_kwargs):
bgneal@215 24 if request.user.is_authenticated() and not request.user.is_active:
bgneal@215 25 logout(request)
bgneal@215 26
bgneal@227 27
bgneal@227 28 ONLINE_COOKIE = 'sg101_online' # online cookie name
bgneal@227 29 ONLINE_TIMEOUT = 10 * 60 # online cookie lifetime in seconds
bgneal@227 30
bgneal@227 31 class WhosOnline(object):
bgneal@227 32 """
bgneal@227 33 This middleware class keeps track of which registered users have
bgneal@227 34 been seen recently, and the number of unique unregistered users.
bgneal@227 35 This middleware should come after the authentication middleware,
bgneal@227 36 as we count on the user attribute being attached to the request.
bgneal@227 37 """
bgneal@227 38
bgneal@227 39 def process_response(self, request, response):
bgneal@227 40 """
bgneal@227 41 Keep track of who is online.
bgneal@227 42 """
bgneal@231 43 # Note that some requests may not have a user attribute
bgneal@231 44 # as these may have been redirected in the middleware chain before
bgneal@231 45 # the auth middleware got a chance to run. If this is the case, just
bgneal@231 46 # bail out. We also ignore AJAX requests.
bgneal@231 47
bgneal@231 48 if not hasattr(request, 'user') or request.is_ajax():
bgneal@229 49 return response
bgneal@227 50
bgneal@227 51 if request.user.is_authenticated():
bgneal@227 52 if request.COOKIES.get(ONLINE_COOKIE) is None:
bgneal@227 53 # update the last seen timestamp
bgneal@227 54 try:
bgneal@227 55 ulv = UserLastVisit.objects.get(user=request.user)
bgneal@227 56 except UserLastVisit.DoesNotExist:
bgneal@227 57 ulv = UserLastVisit(user=request.user)
bgneal@227 58
bgneal@227 59 ulv.last_visit = datetime.datetime.now()
bgneal@227 60 ulv.save()
bgneal@227 61
bgneal@227 62 # set a cookie to expire in 10 minutes or so
bgneal@227 63 response.set_cookie(ONLINE_COOKIE, '1', max_age=ONLINE_TIMEOUT)
bgneal@227 64 else:
bgneal@227 65 if request.COOKIES.get(settings.CSRF_COOKIE_NAME) is not None:
bgneal@227 66 # We have a non-authenticated user that has cookies enabled. This
bgneal@227 67 # means we can track them.
bgneal@227 68 if request.COOKIES.get(ONLINE_COOKIE) is None:
bgneal@227 69 # update the timestamp for this anonymous visitor
bgneal@227 70 ip = get_ip(request)
bgneal@227 71 if ip:
bgneal@227 72 try:
bgneal@227 73 alv = AnonLastVisit.objects.get(ip=ip)
bgneal@227 74 except AnonLastVisit.DoesNotExist:
bgneal@227 75 alv = AnonLastVisit(ip=ip)
bgneal@227 76
bgneal@227 77 alv.last_visit = datetime.datetime.now()
bgneal@370 78
bgneal@370 79 # There is a race condition and sometimes another thread
bgneal@370 80 # saves a record before we do; just log this if it happens.
bgneal@370 81 try:
bgneal@370 82 alv.save()
bgneal@370 83 except IntegrityError:
bgneal@370 84 logging.exception('WhosOnline.process_response')
bgneal@227 85
bgneal@227 86 # set a cookie to expire in 10 minutes or so
bgneal@227 87 response.set_cookie(ONLINE_COOKIE, '1', max_age=ONLINE_TIMEOUT)
bgneal@227 88
bgneal@227 89 return response