Dpe 10203 consumer secret by#1838
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…he consumer The standby/consumer side read the shared offer secret with a fixed Juju label, which registers a consumer-side alias under that label. Juju keeps the alias reserved even after the remote secret is force-removed during a dead-DC teardown, so a former standby is left carrying a stale alias it can neither read nor release. The owner-side OFFER_SECRET_LABEL split already breaks the promotion deadlock, but the consumer alias remains an avoidable latent hazard whose safe reuse depends on unverified Juju relabel behaviour. Referencing the secret purely by the id already published in the relation databag — as the MySQL async-replication charm does — means no consumer alias is ever registered and nothing can go stale, closing the DPE-10203 failure class on the consumer side too. This is backward compatible: the id is already present in primary-cluster-data and no peer depends on the alias existing. Signed-off-by: Marcelo Henrique Neppel <marcelo.neppel@canonical.com>
…on reads
After a dead-DC teardown the remote app/unit databag on the dying cross-model
async relation raises ModelError ("permission denied") on any read. Only
_get_primary_cluster was guarded; the sibling reads were not, so they crashed the
hooks that keep a promoted cluster reconciling — replication-offer-relation-joined
and database-peers-relation-changed both died, leaving units wedged in error and
blocking re-replication to a fresh cluster.
Route every async-relation databag read through a shared _safe_databag_get helper
(and a shared _remote_unit_addresses for the two identical endpoint list
comprehensions) that treats an unreadable databag as key-absent, matching the
existing _get_primary_cluster behaviour, so the teardown always reconciles instead
of crashing.
Signed-off-by: Marcelo Henrique Neppel <marcelo.neppel@canonical.com>
ops implements Application.planned_units() via the goal-state hook command, which
fails ("saas application ... not found") while a cross-model SAAS force-removed
during a dead-DC teardown still lingers in goal-state. Every caller — the _patroni
property construction, the degraded-status check, the synchronous-node count and the
backups pre-checks — crashed its hook, cascading through the _patroni property to
wedge the promoted cluster and block re-replication to a fresh cluster.
Route them through a single guarded _planned_units property that falls back to the
current unit count when goal-state is unavailable, so hooks reconcile instead of
crashing (DPE-10203 Issue B).
Signed-off-by: Marcelo Henrique Neppel <marcelo.neppel@canonical.com>
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