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[Vadym Markov <2008132@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Reproduced issue on the environment with TF Neutron backend and enabled
'enable_fip_topology_check' config option. OVN backend is not affected
in any case, combination of any Neutron backend and disabled
'enable_fip_topology_check' also not affected.

It is possible to remove all FIPs from port via CLI at the TF
environment. In case of enabled topology check it leads to error during
FIP associate and disassociate operations.

Sample of traceback:

2023-01-12 11:23:41.841408   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/dashboards/project/instances/forms.py", line 436
, in __init__
2023-01-12 11:23:41.841412     targets = api.neutron.floating_ip_target_list_by_instance(
2023-01-12 11:23:41.841415   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 1631, in floating_ip_targe
t_list_by_instance
2023-01-12 11:23:41.841419     return FloatingIpManager(request).list_targets_by_instance(
2023-01-12 11:23:41.841425   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 757, in list_targets_by_in
stance
2023-01-12 11:23:41.841429     reachable_subnets = self._get_reachable_subnets(
2023-01-12 11:23:41.841433   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 690, in _get_reachable_sub
nets
2023-01-12 11:23:41.841436     reachable_subnets = set(p.fixed_ips[0]['subnet_id']
2023-01-12 11:23:41.841440   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 690, in <genexpr>
2023-01-12 11:23:41.841444     reachable_subnets = set(p.fixed_ips[0]['subnet_id']
2023-01-12 11:23:41.841446 IndexError: list index out of range

It leads to "Error occured" popup alert at the dashboard and reload of
Instances page.

It would be great to catch this error and provide user more reasonable
message

** Affects: horizon
     Importance: Undecided
         Status: In Progress

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https://bugs.launchpad.net/bugs/2008132

Title:
  Unable to associate FIP with Tungstenfabric Neutron backend

Status in OpenStack Dashboard (Horizon):
  In Progress

Bug description:
  Reproduced issue on the environment with TF Neutron backend and
  enabled 'enable_fip_topology_check' config option. OVN backend is not
  affected in any case, combination of any Neutron backend and disabled
  'enable_fip_topology_check' also not affected.

  It is possible to remove all FIPs from port via CLI at the TF
  environment. In case of enabled topology check it leads to error
  during FIP associate and disassociate operations.

  Sample of traceback:

  2023-01-12 11:23:41.841408   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/dashboards/project/instances/forms.py", line 436
  , in __init__
  2023-01-12 11:23:41.841412     targets = api.neutron.floating_ip_target_list_by_instance(
  2023-01-12 11:23:41.841415   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 1631, in floating_ip_targe
  t_list_by_instance
  2023-01-12 11:23:41.841419     return FloatingIpManager(request).list_targets_by_instance(
  2023-01-12 11:23:41.841425   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 757, in list_targets_by_in
  stance
  2023-01-12 11:23:41.841429     reachable_subnets = self._get_reachable_subnets(
  2023-01-12 11:23:41.841433   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 690, in _get_reachable_sub
  nets
  2023-01-12 11:23:41.841436     reachable_subnets = set(p.fixed_ips[0]['subnet_id']
  2023-01-12 11:23:41.841440   File "/var/lib/openstack/lib/python3.8/site-packages/openstack_dashboard/api/neutron.py", line 690, in <genexpr>
  2023-01-12 11:23:41.841444     reachable_subnets = set(p.fixed_ips[0]['subnet_id']
  2023-01-12 11:23:41.841446 IndexError: list index out of range

  It leads to "Error occured" popup alert at the dashboard and reload of
  Instances page.

  It would be great to catch this error and provide user more reasonable
  message

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