Open Stack

On Tue, Aug 6, 2013 at 2:17 PM, Mac Innes, Kiall <kiall at hp.com> wrote:

> On 06/08/13 21:56, Jonathan LaCour wrote:
> > James Slagle <james.slagle at gmail.com> wrote:
> >
> >> WSME + pecan is being used in Tuskar:
> >> https://github.com/tuskar/tuskar (OpenStack management API)
> >>
> >> We encountered the same issue discussed here.  A solution we settled
> >> on for now was to use a custom Renderer class that could handle
> >> different response codes.  You set the renderer in the call to
> >> pecan.make_app.  This was meant to be a temporary solution until
> >> there's better support in WSME.
> >
> > If there is anything I can do on the Pecan side, let me know! Happy to
> build in new functionality to make this easier, in general. It does seem to
> make sense to be fixed on the WSME side, though.
> >
> > Best --
> >
> > - Jonathan
>
> Nah - this is entirely on the WSME side :)
>
> WSME translate all exceptions that don't extend their ClientExcption to
> HTTP 500, and anything that does to HTTP 400.
>
> Beyond that, you only have the "default status code" to work with - 401,
> 404, 503 etc are all off limits with stock WSME. Literally you have a
> default code for successful requests, and 400 or 500. Nothing else.
>
> It seems like Ceilometer has worked there way around it using the
> "_lookup" method for 404's (but I can't find how they return any other
> status codes..), and libra + tuskar have replaced the WSME error
> handling for something entirely custom.
>
> We're not massively interested in replacing WSME's error handling with
> something custom, so our plan is to just use Pecan and ignore WSME for
> the Designate v2 API. When it's ready, hopefully the switch won't be too
> painful!
>
> Thanks,
> Kiall
>
>
Ironic is also using WSME, and has been bitten by this issue. In certain
situations we want to return either a 200 or a 202, which doesn't work for
the same reasons.

-Deva
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