Initial commit

.flake8

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+[flake8]
+max-line-length = 99
+select: E,W,F,C,N
+exclude:
+  venv
+  .git
+  build
+  dist
+  *.egg_info

.gitignore

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+*.py[cod]
+*.charm
+*~
+.tox
+.coverage
+__pycache__
+build
+venv

.jujuignore

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+/venv
+*.py[cod]
+*.charm

README.md

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+# juju-controller
+
+## Description
+
+The Juju controller hosts and manages Juju models.
+
+## Usage
+
+The controller provides an endpoint to integrate with a dashboard.
+
+## Developing
+
+Create and activate a virtualenv with the development requirements:
+
+    virtualenv -p python3 venv
+    source venv/bin/activate
+    pip install -r requirements-dev.txt
+
+## Testing
+
+The Python operator framework includes a very nice harness for testing
+operator behaviour without full deployment. Just `run_tests`:
+
+    ./run_tests

config.yaml

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+# Copyright 2021 Canonical Ltd.
+# Licensed under the GPLv3, see LICENSE file for details.
+
+options:
+  controller-url:
+    default: ""
+    description: The URL used to access the controller API.
+    type: string
+  model-url-template:
+    default: ""
+    description: The URL template used to access a model API.
+    type: string
+  identity-provider-url:
+    default: ""
+    description: The URL used to access an external identity provider.
+    type: string
+  is-juju:
+    default: true
+    description: Whether this is a standalone Juju controller
+    type: boolean

metadata.yaml

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+# Copyright 2021 Canonical Ltd.
+# Licensed under the GPLv3, see LICENSE file for details.
+name: juju-controller
+description: |
+  The Juju controller charm is used to expose various pieces
+  of functionality of a Juju controller.
+summary: |
+  The Juju controller.
+series:
+  - xenial
+  - bionic
+  - focal
+provides:
+  dashboard:
+    interface: juju-dashboard

requirements-dev.txt

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+-r requirements.txt
+coverage
+flake8

requirements.txt

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+ops

run_tests

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+#!/bin/sh -e
+# Copyright 2021 Canonical Ltd.
+# Licensed under the GPLv3, see LICENSE file for details.
+
+if [ -z "$VIRTUAL_ENV" -a -d venv/ ]; then
+    . venv/bin/activate
+fi
+
+if [ -z "$PYTHONPATH" ]; then
+    export PYTHONPATH=src
+else
+    export PYTHONPATH="src:$PYTHONPATH"
+fi
+
+flake8
+coverage run --source=src -m unittest -v "$@"
+coverage report -m

src/charm.py

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+#!/usr/bin/env python3
+# Copyright 2021 Canonical Ltd.
+# Licensed under the GPLv3, see LICENSE file for details.
+
+import logging
+
+from ops.charm import CharmBase
+from ops.main import main
+from ops.framework import StoredState
+
+logger = logging.getLogger(__name__)
+
+
+class JujuControllerCharm(CharmBase):
+    _stored = StoredState()
+
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.framework.observe(self.on.config_changed, self._on_config_changed)
+        self._stored.set_default(things=[])
+
+    def _on_config_changed(self, _):
+        current = self.config["controller-url"]
+        if current not in self._stored.things:
+            logger.critical("got a new controller-url: %r", current)
+            self._stored.things.append(current)
+
+
+if __name__ == "__main__":
+    main(JujuControllerCharm)

tests/test_charm.py

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+# Copyright 2021 Canonical Ltd.
+# Licensed under the GPLv3, see LICENSE file for details.
+
+import unittest
+
+from ops.testing import Harness
+from charm import JujuControllerCharm
+
+
+class TestCharm(unittest.TestCase):
+    def test_config_changed(self):
+        harness = Harness(JujuControllerCharm)
+        self.addCleanup(harness.cleanup)
+        harness.begin()
+        self.assertEqual(list(harness.charm._stored.things), [])
+        harness.update_config({"controller-url": "https://controller"})
+        self.assertEqual(list(harness.charm._stored.things), ["https://controller"])