horizon deployment causes KeyError on /project/network-topology/

[Sean Newman]

This bug was found with a Stein deployment on Ubuntu 18.04. Horizon was deployed in LXC containers.

The current deployment of Horizon with the openstack-ansible-os_horizon role appears to cause a KeyError when navigating to /project/network-topology/ in Horizon. I've attached a traceback from the Django debug page.

It looks like the issue is that the OPENSTACK_HYPERVISOR_FEATURES setting doesn't include a 'enable_quotas' feature. I've tried adding both 'enable_quotas': True and 'enable_quotas': False to that dictionary in /etc/horizon/local_settings.py and restarting apache2, and the issue goes away. Whether the 'enable_quotas' is set to True or False does not appear to matter - either way, the network topology page loads without error.

This error also manifests on the project overview page (/project/) as a red pop-up warning in the corner that states "Error: Unable to retrieve limits information.". The Limit Summary section on the overview page will be empty - the pie graphs will not appear. If 'enable_quotas': False is set, the page will load without the pop-up warning and the Volume and Network limits sections will populate with accurate pie graphs. If 'enable_quotas': True is set, the Compute limits sections will also function properly.

I tried setting horizon_config_overrides to modify OPENSTACK_HYPERVISOR_FEATURES, but this simply adds the dictionary within settings.HORIZON_SETTINGS, and does not override settings.OPENSTACK_HYPERVISOR_FEATURES. There does not appear to be a way to override this setting.

[XiaoRuiguo (705437650-6)]

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