Add initial charm code

Co-authored-by: Marius Oprin <moprin@cloudbasesolutions.com>

src/layer.yaml

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+includes:
+  - layer:openstack
+  - interface:dashboard-plugin
+options:
+  basic:
+    use_venv: True
+    include_system_packages: False
+repo: https://github.com/openstack/charm-magnum-dashboard
+config:
+  deletes:
+    - debug
+    - verbose
+    - use-internal-endpoints
+    - use-syslog
+    - ssl_ca
+    - ssl_cert
+    - ssl_key

src/lib/charm/openstack/magnum_dashboard.py

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+# Copyright 2021 Canonical Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import os
+
+import charms_openstack.adapters
+import charms_openstack.charm
+
+
+class MagnumDashboardCharm(charms_openstack.charm.OpenStackCharm):
+    release = 'rocky'
+    name = 'octavia-dashboard'
+    packages = ['python3-magnum-ui']
+    python_version = 3
+    adapters_class = charms_openstack.adapters.OpenStackRelationAdapters
+    required_relations = ['dashboard']
+
+    def enable_ui_plugin(self):
+        source = '/etc/openstack-dashboard/enabled'
+        destination = '/usr/lib/python3/dist-packages/openstack_dashboard/local/enabled'
+        for filename in os.listdir(source):
+            if "container_infra" in filename:
+                src = os.path.join(source, filename)
+                dst = os.path.join(destination, filename)
+                os.symlink(src, dst)

src/metadata.yaml

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+name: magnum-dashboard
+summary: Openstack Magnum Dashboard
+maintainer: Marius Oprin<moprin@cloudbasesolutions.com>
+description: |
+   This is the dashboard for the OpenStack COE service, Magnum.
+tags:
+- openstack
+series:
+- bionic
+- focal
+- groovy
+subordinate: true
+requires:
+  dashboard:
+    interface: dashboard-plugin
+    scope: container

src/reactive/magnum_dashboard.py

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+# Copyright 2018 Canonical Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import charms.reactive as reactive
+
+import charms_openstack.bus
+import charms_openstack.charm as charm
+
+charms_openstack.bus.discover()
+
+# Use the charms.openstack defaults for common states and hooks
+charm.use_defaults(
+    'charm.installed',
+    'config.changed',
+    'update-status',
+    'upgrade-charm')
+
+
+@reactive.when('dashboard.available')
+def dashboard_available():
+    """Relation to OpenStack Dashboard principal charm complete.
+    """
+    with charm.provide_charm_instance() as magnum_dashboard_charm:
+        dashboard_relation = reactive.endpoint_from_flag('dashboard.available')
+        dashboard_relation.publish_plugin_info(
+            "", None,
+            conflicting_packages=magnum_dashboard_charm.purge_packages,
+            install_packages=magnum_dashboard_charm.packages)
+        magnum_dashboard_charm.enable_ui_plugin()
+        magnum_dashboard_charm.assess_status()