"AttributeError: 'module' object has no attribute 'InstanceInfoCache'\n"

[Thang Pham]

In the latest devstack (pulled on 7/3/14), you cannot access an instance's noVNC console on the horizon dashboard after you launched the instance. If you look at the logs, you will find:

INFO nova.console.websocketproxy [req-0851007a-adbb-4aff-b712-0108702efa58 None None] handler exception: 'module' object has no attribute 'InstanceInfoCache'#012Traceback (most recent call last):

  File "/opt/stack/oslo.messaging/oslo/messaging/rpc/dispatcher.py", line 134, in _dispatch_and_reply
    incoming.message))

  File "/opt/stack/oslo.messaging/oslo/messaging/rpc/dispatcher.py", line 177, in _dispatch
    return self._do_dispatch(endpoint, method, ctxt, args)

  File "/opt/stack/oslo.messaging/oslo/messaging/rpc/dispatcher.py", line 123, in _do_dispatch
    result = getattr(endpoint, method)(ctxt, **new_args)

  File "/opt/stack/nova/nova/consoleauth/manager.py", line 128, in check_token
    if self._validate_token(context, token):

  File "/opt/stack/nova/nova/consoleauth/manager.py", line 114, in _validate_token
    instance = objects.Instance.get_by_uuid(context, instance_uuid)

  File "/opt/stack/nova/nova/objects/base.py", line 153, in wrapper
    result = fn(cls, context, *args, **kwargs)

  File "/opt/stack/nova/nova/objects/instance.py", line 312, in get_by_uuid
    return cls._from_db_object(context, cls(), db_inst,

  File "/opt/stack/nova/nova/objects/instance.py", line 288, in _from_db_object
    # passed to us by a backlevel service, things will break

AttributeError: 'module' object has no attribute 'InstanceInfoCache'

This was noted in the following forum post: https://ask.openstack.org/en/question/33966/vnc-in-the-dashbaord-says-failed-to-connect-to-server-code-1006-the-set-up-is-by-devstack-on-ubuntu-1204-with-kvm/

[yong sheng gong (gongysh)]

I am running into this bug too.

[Thang Pham (thang-pham)]

Hi Yong Sheng,

I believe your patch would work, but it leaves me wondering why this code was like this in the first place. I am surprised the unit tests and tempest tests did not pick up this import error. I think all nova/object/instance.py needs is "objects.register_all()" near the top.

Regards,
Thang

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/104952

[Thang Pham (thang-pham)]

The solution is to just add "objects.register_all()" to nova/cmd/consoleauth.py, similar to other nova services.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/104952
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a5dbda3f429d0a1e6cb4fc28b2a620dc2b40fd59
Submitter: Jenkins
Branch: master

commit a5dbda3f429d0a1e6cb4fc28b2a620dc2b40fd59
Author: Thang Pham <email address hidden>
Date: Fri Jul 4 14:53:10 2014 -0400

    Resolve import dependency in consoleauth service

    If you attempt to access an instance's noVNC console on the
    horizon dashboard, an AttributeError is thrown, complaining
    about 'module' object having no attribute 'InstanceInfoCache'.
    This is because the objects are not registered by the consoleauth
    service. This patch fixes this import dependency by registering
    all objects so it could be used by the consoleauth service.

    Change-Id: I4f9b922a077076b156833590762106d5cd2ad276
    Closes-Bug: #1337447