On Mar 6, 2008, at 10:56 AM, David Reid wrote:
On Mar 6, 2008, at 2:00 AM, Manlio Perillo wrote:
I think that having a "pure" asynchronous WSGI implementation in
Twisted Web that implements this extension can be a good starting
point for trying to standardize asynchronous web applications.
P.S.: the wsgi.pause_output extension, proposed some years ago here
by Donovan Preston should be very easy to implement using ngx.poll,
and a pipe.
Does anyone support said extension? Does everyone support the same
pause_output? Or just functions of the same name?
It shouldn't be very hard to add support for it to Twisted.web2's
WSGI implementation either, but I don't much see the point if no one
else supports it. I'm not convinced that WSGI is at all a useful
means of writing asynchronous web applications. I think WSGI's only
benefit is that it allows you to almost write your application code
once and run it on multiple containers.
I'd have to disagree (slightly). There's nothing about WSGI that makes
it only applicable to one approach or another (that is, synchronous
versus asynchronous). It's just as easy to write a Deferred-using
asynchronous application as a blocking one.
The real issue is that a "proper" WSGI app gets informed of it's
environment by the wsgi.multithreaded and wsgi.multiprocess environ
variables, so if you really wanted a write-once-run-anywhere, you'd
need to be able to handle both scenarios.
As far as Twisted's WSGI implementation, it should probably support
both approaches, maybe where some kind of argument to the WSGIResource
class constructor determines what it specifies in the environ
dictionary. It should be the responsibility of the WSGI application
itself to do the right thing depending on what's inside the environ
dict.
Also, as an aside, I have recently ported web2's WSGI support back to
web1, and am using it on a production site with much success. I'd like
to contribute it, but I have little to no time to participate in the
Twisted review process. Anyone who would like a copy is welcome to it,
however...
-phil
_______________________________________________
Twisted-web mailing list
[email protected]
http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-web
