[openstack-dev] [nova] [rfc] drop XML from v3 API entirely

David Kranz dkranz at redhat.com
Tue Jan 14 15:50:15 UTC 2014

On 01/14/2014 10:37 AM, Thomas Goirand wrote:
> On 01/13/2014 10:38 PM, Sean Dague wrote:
>> I know we've been here before, but I want to raise this again while
>> there is still time left in icehouse.
>> I would like to propose that the Nova v3 API removes the XML payload
>> entirely. It adds complexity to the Nova code, and it requires
>> duplicating all our test resources, because we need to do everything
>> onces for JSON and once for XML. Even worse, the dual payload strategy
>> that nova employed leaked out to a lot of other projects, so they now
>> think maintaining 2 payloads is a good thing (which I would argue it is
>> not).
>> As we started talking about reducing tempest concurrency in the gate, I
>> was starting to think a lot about what we could shed that would let us
>> keep up a high level of testing, but bring our overall time back down.
>> The fact that Nova provides an extremely wide testing surface makes this
>> challenging.
>> I think it would be a much better situation if the Nova API is a single
>> payload type. The work on the jsonschema validation is also something
>> where I think we could get to a fully discoverable API, which would be
>> huge.
>> If we never ship v3 API with XML as stable, we can deprecate it
>> entirely, and let it die with v2 ( probably a year out ).
>>      -Sean
> Sean,
> +1
> I think this is a very good idea. Also, I'd like to point out that
> supporting XML adds more "attack surface". In other words: we had CVEs
> because of some nasty XML attacks, and it's always better to remove
> useless code and complexity whenever possible.
> Just one thing: is the AWS EC2 API using Json as well?
No, unless they do a really good job of hiding it. And Google Compute 
Engine uses only json.


More information about the OpenStack-dev mailing list