[Zope-dev] Zope2 and WSGI

[Martin Aspeli]

Tres Seaver wrote:

> After a question on the repoze list about running Zope 2.12.x behind a
> WSGI server, I went to try that out.  I came up with a minimal .wsgi
> file to run behind mod_wsgi::
>
>   $ cat src/Zope2/utilities/skel/bin/zope2.wsgi.in
>   from Zope2.Startup.run import configure
>   from Zope2 import startup
>   configure('<<INSTANCE_HOME>>/etc/zope.conf')
>   startup()
>   # mod_wsgi looks for the special name 'application'.
>   from ZPublisher.WSGIPublisher import publish_module as application
>
> which works, mostly, except that all the App.ImageFile stuff, as well as
> anything else using IStreamIterator, doesn't.  Streaming output also
> doesn't work:  I'm not sure what else.

That's pretty cool. :)

I think people will be a bit confused about the relationship between 
this and repoze.zope2, though. Maybe we can make a statement about how 
they differ and whether they ought to be consolidated?

As for IStreamIterator, I think it should work to just return the 
iterator as the WSGI body iterator. At least that works in repoze.zope2.

> I set out to fix these bugs in ZPublisher.WSGIPublisher.WSGIResponse,
> and was dismayed to find it an untested hack-up of the original Publish
> module, with an untested subclass of HTTPResponse, itself almost
> completely test-free.  So I went down the rabbit hole, and got nearly
> 100% coverage of HTTPResponse on my branch, along with cleaning out some
> decade-old fossils.

That's really awesome!

> Remaining work would be to write tests for WSGIResponse, and then tweak
> it (and HTTPResponse) to make doing the Right Thing(TM) possible for
> responses which are more than just a single big string.

Are there any cases other than IStreamIteartor in that case?

> Beyond fixing those bugs:
>
> - - Document using Zope2 behind mod_wsgi.
>
> - - Write a function usable as a PasteDeploy app factory, to allow
>    configuration of Zope2 as the endpoint of a pipeline.  Document
>    this feature.
>
> - - Supply a stripped-down version of WSGIPublisher, delgating the
>    current implementation's "full stack" behavior (error handling,
>    transaction / retry integration) to middleware.  The guts of this
>    can be lifted from repoze.zope2.z2bob. Document using this lighter-
>    weight publisher.

+lots :)

Martin

-- 
Author of `Professional Plone Development`, a book for developers who
want to work with Plone. See http://martinaspeli.net/plone-book