Invalid UUID warning in UUIDFields cannot be escalated to exception

[Balazs Gibizer]

Adding warnings.filterwarnings('error', message=".*invalid UUID.*") to any of the lib's user code to force the warning to become an exception is not possible because the oslo implementation push a warning filter before emitting this warning [1]. As this extra filter becomes the fist filter in the filter list it overrides the filter [2] added by the user code.

[1] https://github.com/openstack/oslo.versionedobjects/blob/339b5f8e57009fd8abcc406d3597d84a2eb1e269/oslo_versionedobjects/fields.py#L350
[2] https://docs.python.org/2/library/warnings.html#warnings.filterwarnings

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/540344

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/540344
Committed: https://git.openstack.org/cgit/openstack/oslo.versionedobjects/commit/?id=0e3526710f67b3b4ebab60864ea060fa9caf9537
Submitter: Zuul
Branch: master

commit 0e3526710f67b3b4ebab60864ea060fa9caf9537
Author: Balazs Gibizer <email address hidden>
Date: Fri Feb 2 12:16:30 2018 +0100

    Allow escalation of UUID validation warning to error

    Today UUIDField emits a warning if the provided value is not a valid
    UUID. However this warning cannot be escalated to an exception through
    the standard warnings module because the validation code also adds a
    warning filter to the warning filter list that overrides the existing
    filters.

    This patch ensures that the 'once' warning filter only added to the
    end of the filter list. This way if the client has already specified
    another filter for this warning (e.g. and error filter) then that
    filter will not be overriden.

    Change-Id: I17cb96d16fcd91195478b738fbdda01b47cfd69d
    Closes-Bug: #1746966

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/oslo.versionedobjects 1.32.0 release.