Previously we would only purge based on URLs, but some of the upcoming
new work requires arbitrary expression purging.
NOTE! Require the creation of the new SQL procecure in the database,
either from varnish.sql or varnish_local.sql depending on if it's prod
or dev.
Previously we required superuser, but that seems a bit excessive. We could
limit it based on specific groups, but for now, we'll allow all staff users.
Now that we have more metadata, we can render this on the main page instead of
on the wiki. This commit copies all the text from the current wiki page, and
uses the new fields in the Version model to render the table on the same URL
as the reference was on before.
This won't happen in production since we don't delete quotes, but it
happens on empty dev environments. It still renders a pretty ugly
frontpage, but it doesn't crash...
This allows all models inherited from PgModel to specify which
URLs to purge by either setting a field or defining a function
called purge_urls, at which point they will be purged whenever
the save signal is fired.
Also implements a form under /admin/purge/ that allows for manual
purging. This should probably be extended in the future to show
the status of the pgq slaves, but that will come later.
Includes a SQL function that posts the expires to a pgq queue. For
a local deployment, this can be replaced with a simple void function
to turn off varnish purging.
Each module now contains a struct.py file that will return all
the URLs that it can generate (yes, this is a small break of the
abstraction of url.py, but we've broken that elsewhere as well),
and also which search-engine-weight (0.1-1.0) that this URL should
be given.
the fact that when pages are served through Varnish, the request will come
from the Varnish server and not from the client.
Create a /system_information page that shows some information about the
connection to help diagnose how the caches work.
part of the core, since it seems like it could be useful for other
kinds of objects as well in the future, but for now only the
software catalogue uses it.
