[DPE-2994] No more relational databag usage (#166)

* Removing databag usage from the charm

.github/workflows/integration_test_juju3.yaml

@@ -0,0 +1,28 @@
+name: integration-tests-juju3
+
+on:
+  pull_request:
+  workflow_call:
+
+jobs:
+  integration-test-juju3:
+    name: Integration Test on Juju3
+    uses: canonical/operator-workflows/.github/workflows/integration_test.yaml@main
+    secrets: inherit
+    with:
+      extra-arguments: >-
+        --openstack-rc=${GITHUB_WORKSPACE}/openrc
+        --kube-config=${GITHUB_WORKSPACE}/kube-config
+        --screenshot-dir=/tmp
+      juju-channel: 3.1/stable
+      channel: 1.27-strict/stable
+      modules: '["test_addon", "test_core"]'
+      pre-run-script: |
+        -c "sudo microk8s enable hostpath-storage
+          sudo microk8s kubectl -n kube-system rollout status -w deployment/hostpath-provisioner
+          sudo microk8s config > ${GITHUB_WORKSPACE}/kube-config
+          chmod +x tests/integration/pre_run_script_juju3.sh
+          ./tests/integration/pre_run_script_juju3.sh"
+      test-tox-env: "integration-juju3"
+      setup-devstack-swift: true
+      trivy-image-config: ./trivy.yaml

src/charm.py

@@ -604,13 +604,15 @@ def _current_effective_db_info(self) -> Optional[types_.DatabaseConfig]:
         relation = self.model.get_relation(self._DATABASE_RELATION_NAME)
         if not relation or relation.app is None:
             return None
-        host, port = self._parse_database_endpoints(relation.data[relation.app].get("endpoints"))
+        host, port = self._parse_database_endpoints(
+            self.database.fetch_relation_field(relation.id, "endpoints")
+        )
         return types_.DatabaseConfig(
             hostname=host,
             port=port,
-            database=relation.data[relation.app].get("database"),
-            username=relation.data[relation.app].get("username"),
-            password=relation.data[relation.app].get("password"),
+            database=self.database.fetch_relation_field(relation.id, "database"),
+            username=self.database.fetch_relation_field(relation.id, "username"),
+            password=self.database.fetch_relation_field(relation.id, "password"),
         )
 
     def _test_database_connectivity(self):

tests/integration/pre_run_script_juju3.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Copyright 2023 Canonical Ltd.
+# See LICENSE file for licensing details.
+
+# Pre-run script for integration test operator-workflows action.
+# https://github.com/canonical/operator-workflows/blob/main/.github/workflows/integration_test.yaml
+
+# Jenkins machine agent charm is deployed on lxd and Jenkins-k8s server charm is deployed on
+# microk8s.
+
+TESTING_MODEL="$(juju switch)"
+
+# lxd should be install and init by a previous step in integration test action.
+echo "bootstrapping lxd juju controller"
+sg snap_microk8s -c "microk8s status --wait-ready"
+sg snap_microk8s -c "juju bootstrap localhost localhost"
+
+echo "Switching to testing model"
+sg snap_microk8s -c "juju switch $TESTING_MODEL"

tests/integration/requirements_juju3.txt

@@ -0,0 +1,13 @@
+cosl
+juju>=3.2.2
+kubernetes>=25.3,<26
+macaroonbakery==1.3.1
+pillow
+pytest
+pytest-cov
+pytest-operator
+python-keystoneclient
+python-swiftclient
+requests
+types-PyYAML
+types-requests

tox.ini

@@ -114,3 +114,11 @@ deps =
     -r{toxinidir}/tests/integration/requirements.txt
 commands =
     pytest {[vars]tst_path} -v --tb native --ignore={[vars]tst_path}unit --log-cli-level=INFO -s {posargs}
+
+[testenv:integration-juju3]
+description = Run integration tests using Juju 3
+deps =
+    -r{toxinidir}/requirements.txt
+    -r{toxinidir}/tests/integration/requirements_juju3.txt
+commands =
+    pytest {[vars]tst_path} -v --tb native --ignore={[vars]tst_path}unit --log-cli-level=INFO -s {posargs}