On 07:41 am, ores...@orestis.gr wrote:
On 21 Οκτ 2013, at 10:32 μ.μ., Glyph <gl...@twistedmatrix.com> wrote:
On Oct 20, 2013, at 2:21 AM, Orestis Markou <ores...@orestis.gr>
wrote:
Hello,
Short form of the question:
Are people using Twisted to host WSGI applications AND serve static
files AND replace celery/redis/other?
I'm not personally using it as a WSGI host, but otherwise, yes, a
full-stack application container speaking multiple protocols.
Any pointers on how to best use this in combination with WSGI/Django?
In the past I had a combination of twisted-web (for /static and /media)
and wsgi host (for everything else), all running under the same
Service. Essentially:
os.environ['DJANGO_SETTINGS_MODULE'] = 'myproject.settings'
application = django.core.handlers.wsgi.WSGIHandler()
wsgi_resource = WSGIResource(reactor, reactor.getThreadPool(),
application)
resource = Root(wsgi_resource)
# this could probably be automatically inferred from settings.py
resource.putChild('static', File(...))
resource.putChild('uploaded', File(...))
# other stuff
site = server.Site(resource)
reactor.listenTCP(8000, site)
reactor.run()
This looks about like I'd expect (if my guess that `Root` is an
`IResource` that knows how to split dispatch between the WSGI resource
and its other children). If you have any suggestions for improving the
experience please share them. :)
[snip]
Here's a thought experiment - I'd like to keep URL routing 100% in
Django for anything that hits the DB. I have some code that needs to
spawn an external process to generate an image on-demand (with a layer
of caching on top). In the past I defined a Twisted.Web handler for
that. Could I now expose an internal API that (through Crochet?) do the
spawnProcess dance and come back with image data that Django could then
handle internally (store in a file, whatever). How would the threaded
WSGI container deal with the blocking request (not really blocking, but
that request would stall until the Deferred would be fired).
It will produce roughly the same results as you'd get if you used any
other WSGI container: one of the threads in the thread pool will be kept
unavailable as it waits for the result. This will have the usual
consequence: if your threadpool has a max of N threads and you receive N
requests that need to do this, the N+1th request that needs to be
handled by the WSGI part of your server won't be handled until one of
the previous requests completes (completion frees up one thread which is
then used to handle the N+1th request).
The only difference might be that since you also have non-WSGI content
(all of your static content) even when your thread pool is completely in
use requests for static content will still be satisfied right away.
However, if you previously had a WSGI+lighttpd/whatever then you
probably already had this property as well.
Put another way, Twisted's WSGI container is still just a WSGI
container. Fortunately Twisted has other pieces aside from a WSGI
container. :)
Jean-Paul
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