[Openstack] Multiple Versions in Openstack API

Thierry Carrez thierry at openstack.org
Thu Mar 3 15:05:30 UTC 2011

Brian Waldon wrote:
> Currently, the Openstack API includes a Versions WSGI application. The
> intended purpose is to detail all versions of the API that are reachable
> by a client. Currently, it only supports "v1.0." As we move towards the
> Cactus release, we need to add support for the new "v1.1" specification.
> The intention of the Versions app seems to be to deploy multiple
> versions of the OS API within the same codebase. Since these two
> versions have significant differences, having to support each in the
> same code seems unnatural.
> With the existing approach, versioning could be accomplished multiple
> ways: version-specific "if" statements, version-specific class
> hierarchies, etc. I feel this is inelegant and could be accomplished a
> much cleaner way. I propose we move the responsibilities of the Versions
> app out of the nova codebase and into the hands of the operator of the
> api endpoints. With this approach, the code would not unnecessarily
> increase in complexity as more versions of the api are released. The
> major drawback of this strategy is that each release of Openstack
> Compute could support a single OS API version.

For the OpenStack API to grow a significant partner ecosystem, it seems
important to me to support at least the recent versions of the API in
new releases of Openstack Compute...

Thierry Carrez (ttx)
Release Manager, OpenStack

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