V1 and V2 APIs need to be started from the same script

[Doug Hellmann]

We need the same script to start both the V1 and V2 APIs for ceilometer for backwards compatibility.

[Doug Hellmann (doug-hellmann)]

See comments on https://review.openstack.org/#/c/17406/

[Angus Salkeld (asalkeld)]

As far as a solution goes:

I was thinking of starting each in it's own greenthread (maybe use the service infrastructure) and v2 api listens
on the metering_port and the v1 api listens on metering_port+1. then the v2 api redirects all v1 requests to
the +1 port.

Any other suggestions?

[Lianhao Lu (lianhao-lu)]

How about applying wsme/pecan to v1 api? What's the effort compared to port redirection?

[Doug Hellmann (doug-hellmann)]

They are both wsgi apps with unique path prefixes. We just need to load them into a wsgi container like gunicorn or mod_wsgi. We should not build a new tool.

[Angus Salkeld (asalkeld)]

gunicorn looks good, in fedora and ubuntu.

[Angus Salkeld (asalkeld)]

Any routes experts out there?
Almost there but need to make a generic route setup.

https://review.openstack.org/#/c/23147/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/23147
Committed: http://github.com/openstack/ceilometer/commit/fa6bdc284ccd3af20839ea92f17caae465a63d82
Submitter: Jenkins
Branch: master

commit fa6bdc284ccd3af20839ea92f17caae465a63d82
Author: Angus Salkeld <email address hidden>
Date: Fri Mar 8 15:28:25 2013 +1100

    Start both v1 and v2 api from one daemon.

    - Move bin/ceilometer-api-v2 to bin/ceilometer-api
    - use VersionSelectorApplication() as the base application.

    bug #1086381
    Change-Id: Ia74938eb351fc374450932a91b21c0755afca2e5
    Signed-off-by: Angus Salkeld <email address hidden>