V2 Zone Import/Export API requires a breaking change

[Kiall Mac Innes]

The V2 Zone Import/Export API requires a breaking change in order to work reliably for large zones.

Large zones may take longer than the allowed API call time to parse, nevermind INSERT, depending on the various timeouts etc. In order to allow for large zones to be imported/exported, these APIs must be converted to full async tasks, see example below. In the meantime, in order to call APIv2 stable, I suggest we either remove the zone import/export code, or we migrate it to the no-contract admin API, allowing us to re-introduce in V2 for Liberty.

e.g. an import example:

POST /zones/tasks/import

202 Accepted
{"id": "<task ID>", "status": PENDING}

.. Wait 1 second... Task is NOT done

GET /zones/tasks/import/<task ID>

200 OK
{"id": "<task ID>", "status": PENDING}

.. Wait 5 minutes... Task is done

GET /zones/tasks/import/<task ID>

200 OK
{"id": "<task ID>", "status": COMPLETE, "zone_id": <Zone ID>}

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/173220
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=aba646b94f07ad55eef09999f6a14ecb14ab25f1
Submitter: Jenkins
Branch: master

commit aba646b94f07ad55eef09999f6a14ecb14ab25f1
Author: Graham Hayes <email address hidden>
Date: Tue Apr 14 10:47:38 2015 +0200

    Move Zone Import / Export to /admin API

    * Moves zonefile import/export to admin API due to issues with non
      async action of import / export
    * Added policy checks to allow restriction of usage
    * Fixed 500 Error on invalid Content-Type when using body_dict()
    Closes-Bug: #1443366
    Change-Id: Iea0f2077f24da9bb1a93d5ac9aadced402343405
    APIImpact: Move zone import / export to /admin