ValueError: Circular reference detected

[Johannes Erdfelt]

jsonutils cannot properly handle the xmlrpclib.DateTime type, causing a recursive loop in the json encoder. Eventually it will fail with this exception:

ValueError: Circular reference detected

This is possible when using the xenapi driver in nova and an exception occurs during a migration. It can then send a notification which includes the arguments to the method that failed, which may include the xmlrpclib.DateTime type that was returned from the XenAPI module.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/8316

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/8316
Committed: http://github.com/openstack/openstack-common/commit/8dbf60c81ba89f578f035e871bde622804053f54
Submitter: Jenkins
Branch: master

commit 8dbf60c81ba89f578f035e871bde622804053f54
Author: Johannes Erdfelt <email address hidden>
Date: Thu Jun 7 23:22:17 2012 +0000

    Handle xmlrpclib.DateTime types when serializing to JSON

    Fixes bug 1010124

    Convert xmlrpclib.DateTime types to datetime so they can be serialized
    without creating an exception.

    Change-Id: Ifcab69ad81d39d7f4066df5c71c6ab6734fb1fab