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A memcached backed rate limiting decorator for Django.
Home Page: http://simonwillison.net/2009/Jan/7/ratelimitcache/
This project forked from simonw/ratelimitcache
A memcached backed rate limiting decorator for Django.
Home Page: http://simonwillison.net/2009/Jan/7/ratelimitcache/
ratelimitcache for Django ========================= By Simon Willison - http://simonwillison.net/ A rate limiter that uses Django's cache framework, with no requirement for a persistent data store. More information: http://simonwillison.net/2009/Jan/7/ratelimitcache/ Installation: Place the ratelimitcache.py on your Python path. Configure your CACHE_BACKEND setting. For best results, use the memcached backend - the other backends do not provide an atomic counter increment and so may suffer from less effective limiting due to race conditions. Cache documentation: http://docs.djangoproject.com/en/dev/topics/cache/ Demo: cd demo/ ./manage.py runserver 8008 Now browse to: http://localhost:8008/ http://localhost:8008/debug/ http://localhost:8008/login/ Basic usage (max 20 requests every 3 minutes): from ratelimitcache import ratelimit @ratelimit(minutes = 3, requests = 20) def myview(request): # ... return HttpResponse('...') Protecting a login form, i.e rate limit on IP address and attempted username: from ratelimitcache import ratelimit_post @ratelimit_post(minutes = 3, requests = 10, key_field = 'username') def login(request): # ... return HttpResponse('...') You can also use it directly in urls.py. Here's how you would use it with the login() view function provided by Django: from ratelimitcache import ratelimit_post from django.contrib.auth.views import login urlpatterns = patterns('', #... (r'^login/$', ratelimit_post( minutes = 3, requests = 10, key_field = 'username' )(login)), ) Custom behaviour, e.g. logging when the rate limit condition fails: from ratelimitcache import ratelimit from my_logging_app.models import Log import datetime, pprint class ratelimit_with_logging(ratelimit): def disallowed(self, request): Log.objects.create( ip_address = request.META.get('REMOTE_ADDR'), path = request.path, counters = pprint.pformat( self.get_counters(reqest) ), created = datetime.datetime.now() ) return HttpResponseForbidden('Rate limit exceeded') @ratelimit_with_logging(minutes = 3, requests = 20) def myview(request): # ... return HttpResponse('...')
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