istio-pilot goes to Error if the charms related via ingress-auth are not ready

[orfeas-k]

We think that istio-pilot goes to Error state with message hook failed: "ingress-relation-changed" when the charm related via ingress-auth is not ready yet. We 've noticed this while deploying CKF 1.7/edge in an airgapped environment and oidc-gatekeeper was in Blocked. It took some minutes to istio-pilot going to active after we 've configured oidc-gatekeeper (thus it went to active).

Logs from the unit

unit-istio-pilot-0: 13:33:55 ERROR unit.istio-pilot/0.juju-log ingress:16: Uncaught exception while in charm code:
Traceback (most recent call last):
  File "./src/charm.py", line 983, in <module>
    main(Operator)
  File "/var/lib/juju/agents/unit-istio-pilot-0/charm/venv/ops/main.py", line 441, in main
    _emit_charm_event(charm, dispatcher.event_name)
  File "/var/lib/juju/agents/unit-istio-pilot-0/charm/venv/ops/main.py", line 149, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-istio-pilot-0/charm/venv/ops/framework.py", line 354, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-istio-pilot-0/charm/venv/ops/framework.py", line 830, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-istio-pilot-0/charm/venv/ops/framework.py", line 919, in _reemit
    custom_handler(event)
  File "./src/charm.py", line 246, in reconcile
    ingress_auth_data = self._get_ingress_auth_data(event)
  File "./src/charm.py", line 451, in _get_ingress_auth_data
    ingress_auth_data = list(ingress_auth_data.values())[0]
IndexError: list index out of range
unit-istio-pilot-0: 13:33:56 ERROR juju.worker.uniter.operation hook "ingress-relation-changed" (via hook dispatching script: dispatch) failed: exit status 1

which means that it errored out here.

[kimwnasptd]

Bumped into this as well when playing around with the 1.7/stable bundle. This seem to happen quite frequently, so we'll need to prioritize

[orfeas-k]

Closed by #342