Django Middleware and utilities that send "PURGE" request to an upstream cache
Project description
What is it?
This package allows django to purge HTTP cache when a model instance is changed or deleted. It does this by sending “PURGE” requests to one or more upstream HTTP cache (such as Squid or Varnish). This is inspired by Plone CacheFu components.
Usage
In settings.py put ‘django_cachepurge’ before any other application; else it may fail to register some models:
INSTALLED_APPS = ( 'django_cachepurge', ... )
Add the middleware:
MIDDLEWARE_CLASSES = (
...
'django_cachepurge.middleware.CachePurge',
)
Define CACHE_URLS:
CACHE_URLS = 'http://127.0.0.1:3128'
or if you have more than one cache:
CACHE_URLS = ('http://127.0.0.1:3128',
'http://192.168.1.42:3128')
Models
Urls are extracted from models instances on post_save signal. Two sources are used:
instance.get_absolute_url(), if it exists
instance.get_purge_urls(), if it exists. The application expects a list of absolute paths similar to what is provided by get_absolute_url().
Purge request is sent when response has been computed: if an exception occurs the urls are not purged. Purge requests are asynchronous: worker threads handle that so that we don’t have wait to complete all requests before returning the response.
Cache configuration
The cache must be configured to accept and handle “PURGE” requests from the server where the django application is hosted.
Homepage, code, bug tracker
Homepage: http://launchpad.net/django-cachepurge
Code repository: http://code.launchpad.net/django-cachepurge
Report bugs at http://bugs.launchpad.net/django-cachepurge
Contributors
Bertrand Mathieu, Author
Change history
0.3 - 2011-04-01
Compatible with Django 1.3: don’t import django.utils.thread_support
catch NoReverseMatch exception when trying to find an instance’s url
0.2 - 2010-11-22
Accept to purge only site urls, converted if needed into their relative form (i.e, “/some/path/”)
0.1a - 2009-05-25
0.1a: 0.1 released missed some files
Initial release
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