[DPE-10887] refactor(relations): adopt the single-kernel client relation - #1900
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Move the database (client) relation provider into the single-kernel library: delete the charm's src/relations/postgresql_provider.py and its tests, and wire the provider events through the lib's DatabaseManager. The charm implements get_resource_provider so the lib's ConfigManager reads substrate resources via the resource_provider injection contract (lib #215) on the db-provider lib branch. Pin the lib at the rebased test/02-db-events tip (archive-URL SHA, since the db-provider stack is not yet published to PyPI), stacked on the skl-01 16.3.5 update_config adoption. Signed-off-by: Marcelo Henrique Neppel <marcelo.neppel@canonical.com>
…relation The client-relation subsystem the branch adopts is now on 16/edge and published: the pin moves from the pre-release archive-URL stopgap (706cd21, the validated stack tip) to the released 16.3.6 from PyPI (extras: postgresql, vm) — the sdist is byte-identical to the validated tree, so the adoption code is unchanged apart from the wiring that follows the lib's review rework: the charm is now the composition root constructing DatabaseProvides and DatabaseManager, and the endpoint inputs (online Patroni members on VM, client TLS files) are gathered caller-side and threaded into update_endpoints, as the lib no longer holds peer-manager references. Signed-off-by: Marcelo Henrique Neppel <marcelo.neppel@canonical.com>
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Issue
src/relations/postgresql_provider.py(645 lines) is a near-copy of the K8s charm's version of the same file, and the library now owns the postgresql-client relation.Solution
Deletes the charm's provider and its tests, and constructs
single_kernel_postgresql.events.database.DatabaseEventsHandlerinstead. The remaining call sites move to the manager:oversee_users()now takes the PostgreSQL client,update_endpoints()takes an optional relation id rather than an event.The library pin is the published
16.3.6from PyPI. Following the library review, the charm is the composition root for the client-relation subsystem: it constructsDatabaseProvidesandDatabaseManageritself and passes the manager to the events handler.update_endpointstakes its inputs caller-side — the online Patroni members (gathered only on the leader, so non-leader units fire no extra REST calls) and the client TLS files.Two seams close with it:
refresh_endpointsis gone.ConfigManagerholds the database manager and refreshes endpoints itself.update_configno longer takes a user hash._collect_user_relationsdelegates to the manager, and the hash is derived from the same relation data the user-databases map comes from, sogenerate_user_hashhad nothing left to do.relations_user_databases_mapstays here — its computation diverges between the substrates and belongs to the core event-loop phase.Checklist