Comment 20 for bug 1661360

Reviewed: https://review.openstack.org/457283
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=d3c084f23448d1890bfda4a06de246f2be3c1279
Submitter: Jenkins
Branch: master

commit d3c084f23448d1890bfda4a06de246f2be3c1279
Author: Chris Dent <email address hidden>
Date: Mon Apr 17 16:38:49 2017 +0000

    Register osapi_compute when nova-api is wsgi

    When the nova-api services starts from its own standalone binary it
    registers itself in the services table. The original wsgi script in
    nova/wsgi/nova-api.py did not, leading to the bug referenced below.

    The new wsgi script at nova.api.openstack.compute.wsgi, modelled on
    a similar thing used for the placement API, provides the necessary
    service registration.

    If a ServiceTooOld exception happens while trying to register the
    service then a very simple (currently very stubby) application is
    loaded instead of the compute api. This application returns a 500
    and a message.

    Some caveats/todos:

    * wsgi apps managed under mod-wsgi (and presumably other containers)
      are not imported/compiled/run until the first request is made. In
      this case that means the service handling does not happen until
      that first request, somewhat defeating the purpose if the api is a
      bit idle.

    Change-Id: I7c4acfaa6c50ac0e4d6de69eb62ec5bbad72ff85
    Closes-Bug: #1661360