TypeError at /admin/routers/ issubclass() arg 1 must be a class

[Sean McCully]

I've included the django debug page,

$ neutron router-list
+--------------------------------------+-----------+-----------------------------------------------------------------------------+
| id | name | external_gateway_info |
+--------------------------------------+-----------+-----------------------------------------------------------------------------+
| d54ec5f0-1afa-4b38-a27b-5994425c04ed | my router | {"network_id": "4783f398-8a7e-4e50-8b6f-6141df053d6a", "enable_snat": true} |
+--------------------------------------+-----------+-----------------------------------------------------------------------------+

$ neutron net-list
+--------------------------------------+--------+-----------------------------------------------------+
| id | name | subnets |
+--------------------------------------+--------+-----------------------------------------------------+
| 4783f398-8a7e-4e50-8b6f-6141df053d6a | public | 7595b3d5-2086-48b2-ab08-e4bdccc587ed 192.168.1.0/24 |
+--------------------------------------+--------+-----------------------------------------------------+

$ neutron port-list
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------+
| 7f2d6932-a306-4b0c-9d8c-84731e886e45 | | fa:16:3e:14:ac:ee | {"subnet_id": "7595b3d5-2086-48b2-ab08-e4bdccc587ed", "ip_address": "192.1.1.2"} |
+--------------------------------------+------+-------------------+------------------------------------------------------------------------------------

[Victoria Martinez de la Cruz (vkmc)]

Could you provide the steps to reproduce this and some details about the environment? Thanks!

[Akihiro Motoki (amotoki)]

After reading the raw HTML of the attached horizon-bug.html,
I confirmed ext_net_dict is an empty dict {}.

There are the following possibilities:
(a) Admin user fails to retrieve external network lists
(b) Neutron returns an empty list.
(c) Horizon calls Neutron API with wrong user.

Perhaps it is a bug of not Horizon but Neutron itself, but I am sure with 100%.

If you are using devstack, the detail of Neutron API calls are logged to /var/log/apache2/horizon_error.log.
Please let us know if you can still produce this error.

[Launchpad Janitor (janitor)]

[Expired for OpenStack Dashboard (Horizon) because there has been no activity for 60 days.]

[Matthew D. Wood (woodm1979)]

While not able to recreate the error myself, our error-logging system found this error as well.
The problem is that exceptions.handle is being called when there's no exception.

I'd like to re-open this bug.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/75934

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/75934
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=d9ecd8d15759297a15382d7353482a2eff4b26bb
Submitter: Jenkins
Branch: master

commit d9ecd8d15759297a15382d7353482a2eff4b26bb
Author: woodm1979 <email address hidden>
Date: Mon Feb 24 10:32:36 2014 -0700

    Fix handling of missing external network

    When an external network can't be found, project/routers/index.html will
    result in a type error caused by calling exceptions.handle when no
    exception is present. In this case, an error message should be
    displayed, and the missing-network should be indicated to the user.

    Also added tests for this case.

    Change-Id: I3aaa64de28738051ad84cc587fbb6cfd546f4662
    Closes-Bug: 1220345