On Mar 17, 6:19 pm, Malcolm Tredinnick <malc...@pointy-stick.com>
wrote:
> On Tue, 2009-03-17 at 00:12 -0700, Ramashish Baranwal wrote:
> > Hi,
>
> > I need to do some cleanup after sending a response to the client. That
> > means I want to send response without returning a response object.
> > Something like-
>
> > def handler(request):
> > # ...
> > resp = HttpResponse(data)
> > # send response in some way (?)
> > # clean up, log, etc..
>
> > I know its unusual to do this, but is there a way to achieve it? If
> > not directly, then a way to setup the cleanup code to run after the
> > response has been sent will also do.
>
> What sort of things do you need to do that can't be done before sending
> back the response? Most of the things I can think of (such as the time
> taken to send the response) are out of scope for Django, since it lives
> at a layer below the stuff that actually interacts with the webserver.
>
> So if this were possible with poking at the deep internals, it would
> involve looking at the handlers. It might be possible to do something
> by, for example, hooking into some parts of the WSGI framework. You'd be
> subclassing Django's existing WSGI handler (or writing your own) in that
> case.
>
> Short answer is, no, it's not really possible, unless you're willing to
> poke at the internals and write your own HTTP handler class.
If using a WSGI hosting mechanism such as mod_wsgi, you could use a
WSGI middleware wrapper that sits outside of Django to trigger a
cleanup handler. Such things are documented in:
http://code.google.com/p/modwsgi/wiki/RegisteringCleanupCode
You just need to implement a registration hook so the cleanup handler
knows what function to call to perform the cleanup. You could possibly
use Python thread locals to to store the callback along with any data,
with cleanup handler getting it from there and then deleting the
thread local references when done.
Graham
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