[Web-SIG] A 'shutdown' function in WSGI

[Sylvain Hellegouarch]

On Tue, Feb 21, 2012 at 10:31 AM, Graham Dumpleton <
graham.dumpleton at gmail.com> wrote:

> On 21 February 2012 20:26, Simon Sapin <simon.sapin at exyr.org> wrote:
> > Le 21/02/2012 09:23, Tarek Ziadé a écrit :
> >
> >>    Instead of having to provide two or three objects separately to a
> >>    server, how about making the callbacks attributes of the application
> >>    callable?
> >>
> >>
> >> can you show us an example ?
> >
> >
> > Proposal:
> >
> > Function-based:
> >
> >    def startup():
> >        return open_resource(something)
> >
> >    def shutdown(resource):
> >        resource.close()
> >
> >    def application(environ, start_response):
> >        # ...
> >        return response_body
> >
> >    application.startup = startup
> >    application.shutdown = shutdown
> >
> > Class-based:
> >
> >    class App(object):
> >        def startup(self):
> >            return open_resource(something)
> >
> >        def shutdown(self, resource):
> >            resource.close()
> >
> >        def __call__(self, environ, start_response):
> >            # ...
> >            return response_body
> >
> >    application = App()
> >
> > The return value of startup() can be any python object and is opaque to
> the
> > server. It is passed as-is to shutdown()
> >
> > startup() could take more parameters. Maybe the application (though can
> we
> > already have it as self for class-based or in a closure for
> function-based)
>
> You do realise you are just reinventing context managers?
>
> With this 'application' do requests.
>
> But then it was sort of suggested that was a bit too radical idea when
> I have mentioned viewing it that way before. :-(
>
>
One might wonder if having access to process management should be part of
WSGI in the first place.

-- 
- Sylvain
http://www.defuze.org
http://twitter.com/lawouach
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