UnicodeError when events enabled

[gordon chung]

when enabling events in gate, an occasional unicode error is thrown when attempting to convert incoming notification to Event.

2015-02-11 23:55:48.327 28983 ERROR oslo_messaging.notify.dispatcher [-] Exception during message handling
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher Traceback (most recent call last):
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/notify/dispatcher.py", line 89, in _dispatch_and_handle_error
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher executor_callback)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/notify/dispatcher.py", line 129, in _dispatch
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher metadata)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/opt/stack/new/ceilometer/ceilometer/event/endpoint.py", line 59, in info
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher self.process_notification(notification)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/opt/stack/new/ceilometer/ceilometer/event/endpoint.py", line 63, in process_notification
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher event = self.event_converter.to_event(notification)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/opt/stack/new/ceilometer/ceilometer/event/converter.py", line 351, in to_event
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher return edef.to_event(notification_body)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/opt/stack/new/ceilometer/ceilometer/event/converter.py", line 234, in to_event
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher traits = [trait for trait in traits if trait is not None]
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/opt/stack/new/ceilometer/ceilometer/event/converter.py", line 232, in <genexpr>
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher for t in self.traits)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/opt/stack/new/ceilometer/ceilometer/event/converter.py", line 142, in to_trait
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher value = models.Trait.convert_value(self.trait_type, value)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher File "/opt/stack/new/ceilometer/ceilometer/event/storage/models.py", line 120, in convert_value
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher return str(value)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher UnicodeEncodeError: 'ascii' codec can't encode character u'\u20a1' in position 0: ordinal not in range(128)
2015-02-11 23:55:48.327 28983 TRACE oslo_messaging.notify.dispatcher

http://logs.openstack.org/04/155104/1/check/check-tempest-dsvm-full/95e13c4/logs/screen-ceilometer-anotification.txt.gz?level=TRACE

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/155501
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=7ae6145cb511d6021b75a61028b211874fb0787a
Submitter: Jenkins
Branch: master

commit 7ae6145cb511d6021b75a61028b211874fb0787a
Author: gordon chung <email address hidden>
Date: Thu Feb 12 16:51:43 2015 -0500

    unicode error in event converter

    it's possible that a unicode error be thrown when attempting to
    convert notification to event. this patch uses six to handle this
    issue.

    Closes-Bug: #1421430
    Change-Id: Icf450792fd2921344c2a432e5a72be18dda33ac9