resource_provider API handler does not return specific error codes

[Jay Pipes]

There are a few places in the resource_provider.py placement API handler module that need to be updated to return custom error codes.

Custom error codes were added in the last few months or so. They allow the caller to determine what exact issue occurred on the server to, for example, cause a 409 Conflict to be returned.

In the resource_provider handler, look for places where we are raising an HTTPConfict exception and add in a "comment" attribute for the exception.

Here's an example of this being done in the allocation handler:

https://github.com/openstack/nova/blob/dbfba3951325524da184ddb681f71fd88e5ee81c/nova/api/openstack/placement/handlers/allocation.py#L335

For CannotDeleteParentProvider, you will want to create a new custom error code in this file:

https://github.com/openstack/nova/blob/dbfba3951325524da184ddb681f71fd88e5ee81c/nova/api/openstack/placement/errors.py

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/579423

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 18.0.0.0b3 development milestone.