[openstack-dev] [nova] [api] [placement] strategy for placement api structure

Jay Pipes jaypipes at gmail.com
Mon Jun 20 18:00:34 UTC 2016

On 06/20/2016 12:47 PM, Doug Hellmann wrote:
> Excerpts from Jay Pipes's message of 2016-06-20 10:04:06 -0400:
>> On 06/17/2016 11:23 AM, Sylvain Bauza wrote:
>>> +1000 yes to that. Now the devil could be in the details, in particular
>>> how we implement the WSGI server, the corresponding WSGI app and the
>>> associated routing, and that's exactly the problem below.
>> We shouldn't be implementing a WSGI server *at all*. The fact that one
>> cannot run Nova inside a true WSGI server (i.e. Apache/mod_wsgi, uwsgi,
>> etc) is a bad thing.
>>> I certainly understand the concerns of adding yet another library. To be
>>> honest, I tend to even agree with the statement that we could possibly
>>> use Routes without explicitly use nova.wsgi, right ?
>>> In the review, you explain why you don't trust Routes and I respect
>>> that. That said, are those issues logged as real problems for our API
>>> consumers, which are mostly client libraries that we own and other
>>> projects we know, like Horizon ?
>>> If that is a problem for those, is there something we could improve,
>>> instead of just getting rid of it ?
>> For the record, I'm very much in favor of the approach Chris has taken
>> in a framework-less implementation with nothing other than the (tiny)
>> selector library as a dependency. I'd like to see the work move forward.
>> Best,
>> -jay
> It seems like choosing to avoid an existing framework is just going
> to eventually result in another new framework evolving organically
> as things like common aspects like error handling and transactions
> are refactored out of of individual handlers.

WSGI frameworks shouldn't be handling transactions, IMHO. That's a ba d 
coupling problem.

And no, I don't believe this will result in a new framework being 
created, precisely for the reason that no such framework is needed...

> Is it really so bad to just pick a tool already being used in some
> portion of the rest of the community?

As I said, I'm OK with using Routes since it's already in g-r, but I 
just don't see a need for a WSGI framework, especially one that includes 
things like a WSGI server.


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