[DPE-2278] Add libpq's connection string URI format to uri field in…

… relation databag (#545)

* set URI on charm

* test uri in connection

* add await

* debug

* revert test changes

src/relations/postgresql_provider.py

@@ -109,6 +109,12 @@ def _on_database_requested(self, event: DatabaseRequestedEvent) -> None:
                 f"{self.charm.primary_endpoint}:{DATABASE_PORT}",
             )
 
+            # Set connection string URI.
+            self.database_provides.set_uris(
+                event.relation.id,
+                f"postgresql://{user}:{password}@{self.charm.primary_endpoint}:{DATABASE_PORT}/{database}",
+            )
+
             # Update the read-only endpoint.
             self.update_read_only_endpoint(event)
 

tests/unit/test_postgresql_provider.py

@@ -126,6 +126,7 @@ def test_on_database_requested(harness):
             "username": user,
             "password": "test-password",
             "read-only-endpoints": "postgresql-k8s-replicas.None.svc.cluster.local:5432",
+            "uris": f"postgresql://{user}:[email protected]:5432/{DATABASE}",
             "version": POSTGRESQL_VERSION,
             "database": f"{DATABASE}",
         }
@@ -140,6 +141,7 @@ def test_on_database_requested(harness):
         assert harness.get_relation_data(rel_id, harness.charm.app.name) == {
             "data": f'{{"database": "{DATABASE}", "extra-user-roles": "{EXTRA_USER_ROLES}"}}',
             "endpoints": "postgresql-k8s-primary.None.svc.cluster.local:5432",
+            "uris": f"postgresql://{user}:[email protected]:5432/{DATABASE}",
             "read-only-endpoints": "postgresql-k8s-replicas.None.svc.cluster.local:5432",
         }
 
@@ -151,6 +153,7 @@ def test_on_database_requested(harness):
             "data": f'{{"database": "{DATABASE}", "extra-user-roles": "{EXTRA_USER_ROLES}"}}',
             "endpoints": "postgresql-k8s-primary.None.svc.cluster.local:5432",
             "read-only-endpoints": "postgresql-k8s-replicas.None.svc.cluster.local:5432",
+            "uris": f"postgresql://{user}:[email protected]:5432/{DATABASE}",
         }
 
         # BlockedStatus due to a PostgreSQLGetPostgreSQLVersionError.