openstack/sunbeam-charms
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charm init

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James Page
2021-09-23 09:32:42 +01:00
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[flake8]
max-line-length = 99
select: E,W,F,C,N
exclude:
venv
.git
build
dist
*.egg_info

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venv/
build/
*.charm
.coverage
__pycache__/
*.py[cod]

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/venv
*.py[cod]
*.charm

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# charm-cinder-operator
## Developing
Create and activate a virtualenv with the development requirements:
virtualenv -p python3 venv
source venv/bin/activate
pip install -r requirements-dev.txt
## Code overview
TEMPLATE-TODO:
One of the most important things a consumer of your charm (or library)
needs to know is what set of functionality it provides. Which categories
does it fit into? Which events do you listen to? Which libraries do you
consume? Which ones do you export and how are they used?
## Intended use case
TEMPLATE-TODO:
Why were these decisions made? What's the scope of your charm?
## Roadmap
If this Charm doesn't fulfill all of the initial functionality you were
hoping for or planning on, please add a Roadmap or TODO here
## Testing
The Python operator framework includes a very nice harness for testing
operator behaviour without full deployment. Just `run_tests`:
./run_tests

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# charm-cinder-operator
## Description
TODO: Describe your charm in a few paragraphs of Markdown
## Usage
TODO: Provide high-level usage, such as required config or relations
## Relations
TODO: Provide any relations which are provided or required by your charm
## OCI Images
TODO: Include a link to the default image your charm uses
## Contributing
Please see the [Juju SDK docs](https://juju.is/docs/sdk) for guidelines
on enhancements to this charm following best practice guidelines, and
`CONTRIBUTING.md` for developer guidance.

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charms/cinder-k8s/actions.yaml Normal file
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# Copyright 2021 James Page
# See LICENSE file for licensing details.
#
# TEMPLATE-TODO: change this example to suit your needs.
# If you don't need actions, you can remove the file entirely.
# It ties in to the example _on_fortune_action handler in src/charm.py
#
# Learn more about actions at: https://juju.is/docs/sdk/actions
fortune:
description: Returns a pithy phrase.
params:
fail:
description: "Fail with this message"
type: string
default: ""

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# Learn more about charmcraft.yaml configuration at:
# https://juju.is/docs/sdk/charmcraft-config
type: "charm"
bases:
- build-on:
- name: "ubuntu"
channel: "20.04"
run-on:
- name: "ubuntu"
channel: "20.04"

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charms/cinder-k8s/config.yaml Normal file
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# Copyright 2021 James Page
# See LICENSE file for licensing details.
#
# TEMPLATE-TODO: change this example to suit your needs.
# If you don't need a config, you can remove the file entirely.
# It ties in to the example _on_config_changed handler in src/charm.py
#
# Learn more about config at: https://juju.is/docs/sdk/config
options:
thing:
default: 🎁
description: A thing used by the charm.
type: string

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charms/cinder-k8s/metadata.yaml Normal file
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# Copyright 2021 James Page
# See LICENSE file for licensing details.
# For a complete list of supported options, see:
# https://discourse.charmhub.io/t/charm-metadata-v2/3674/15
name: charm-cinder-operator
display-name: |
TEMPLATE-TODO: fill out a display name for the Charmcraft store
description: |
TEMPLATE-TODO: fill out the charm's description
summary: |
TEMPLATE-TODO: fill out the charm's summary
# TEMPLATE-TODO: replace with containers for your workload (delete for non-k8s)
containers:
httpbin:
resource: httpbin-image
# TEMPLATE-TODO: each container defined above must specify an oci-image resource
resources:
httpbin-image:
type: oci-image
description: OCI image for httpbin (kennethreitz/httpbin)

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-r requirements.txt
coverage
flake8

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ops >= 1.2.0

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charms/cinder-k8s/run_tests Executable file
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#!/bin/sh -e
# Copyright 2021 James Page
# See LICENSE file for licensing details.
if [ -z "$VIRTUAL_ENV" -a -d venv/ ]; then
. venv/bin/activate
fi
if [ -z "$PYTHONPATH" ]; then
export PYTHONPATH="lib:src"
else
export PYTHONPATH="lib:src:$PYTHONPATH"
fi
flake8
coverage run --branch --source=src -m unittest -v "$@"
coverage report -m

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#!/usr/bin/env python3
# Copyright 2021 James Page
# See LICENSE file for licensing details.
#
# Learn more at: https://juju.is/docs/sdk
"""Charm the service.
Refer to the following post for a quick-start guide that will help you
develop a new k8s charm using the Operator Framework:
https://discourse.charmhub.io/t/4208
"""
import logging
from ops.charm import CharmBase
from ops.framework import StoredState
from ops.main import main
from ops.model import ActiveStatus
logger = logging.getLogger(__name__)
class CharmCinderOperatorCharm(CharmBase):
"""Charm the service."""
_stored = StoredState()
def __init__(self, *args):
super().__init__(*args)
self.framework.observe(self.on.httpbin_pebble_ready, self._on_httpbin_pebble_ready)
self.framework.observe(self.on.config_changed, self._on_config_changed)
self.framework.observe(self.on.fortune_action, self._on_fortune_action)
self._stored.set_default(things=[])
def _on_httpbin_pebble_ready(self, event):
"""Define and start a workload using the Pebble API.
TEMPLATE-TODO: change this example to suit your needs.
You'll need to specify the right entrypoint and environment
configuration for your specific workload. Tip: you can see the
standard entrypoint of an existing container using docker inspect
Learn more about Pebble layers at https://github.com/canonical/pebble
"""
# Get a reference the container attribute on the PebbleReadyEvent
container = event.workload
# Define an initial Pebble layer configuration
pebble_layer = {
"summary": "httpbin layer",
"description": "pebble config layer for httpbin",
"services": {
"httpbin": {
"override": "replace",
"summary": "httpbin",
"command": "gunicorn -b 0.0.0.0:80 httpbin:app -k gevent",
"startup": "enabled",
"environment": {"thing": self.model.config["thing"]},
}
},
}
# Add intial Pebble config layer using the Pebble API
container.add_layer("httpbin", pebble_layer, combine=True)
# Autostart any services that were defined with startup: enabled
container.autostart()
# Learn more about statuses in the SDK docs:
# https://juju.is/docs/sdk/constructs#heading--statuses
self.unit.status = ActiveStatus()
def _on_config_changed(self, _):
"""Just an example to show how to deal with changed configuration.
TEMPLATE-TODO: change this example to suit your needs.
If you don't need to handle config, you can remove this method,
the hook created in __init__.py for it, the corresponding test,
and the config.py file.
Learn more about config at https://juju.is/docs/sdk/config
"""
current = self.config["thing"]
if current not in self._stored.things:
logger.debug("found a new thing: %r", current)
self._stored.things.append(current)
def _on_fortune_action(self, event):
"""Just an example to show how to receive actions.
TEMPLATE-TODO: change this example to suit your needs.
If you don't need to handle actions, you can remove this method,
the hook created in __init__.py for it, the corresponding test,
and the actions.py file.
Learn more about actions at https://juju.is/docs/sdk/actions
"""
fail = event.params["fail"]
if fail:
event.fail(fail)
else:
event.set_results({"fortune": "A bug in the code is worth two in the documentation."})
if __name__ == "__main__":
main(CharmCinderOperatorCharm)

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charms/cinder-k8s/tests/__init__.py Normal file
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# Copyright 2021 James Page
# See LICENSE file for licensing details.
#
# Learn more about testing at: https://juju.is/docs/sdk/testing
import unittest
from unittest.mock import Mock
from charm import CharmCinderOperatorCharm
from ops.model import ActiveStatus
from ops.testing import Harness
class TestCharm(unittest.TestCase):
def setUp(self):
self.harness = Harness(CharmCinderOperatorCharm)
self.addCleanup(self.harness.cleanup)
self.harness.begin()
def test_config_changed(self):
self.assertEqual(list(self.harness.charm._stored.things), [])
self.harness.update_config({"thing": "foo"})
self.assertEqual(list(self.harness.charm._stored.things), ["foo"])
def test_action(self):
# the harness doesn't (yet!) help much with actions themselves
action_event = Mock(params={"fail": ""})
self.harness.charm._on_fortune_action(action_event)
self.assertTrue(action_event.set_results.called)
def test_action_fail(self):
action_event = Mock(params={"fail": "fail this"})
self.harness.charm._on_fortune_action(action_event)
self.assertEqual(action_event.fail.call_args, [("fail this",)])
def test_httpbin_pebble_ready(self):
# Check the initial Pebble plan is empty
initial_plan = self.harness.get_container_pebble_plan("httpbin")
self.assertEqual(initial_plan.to_yaml(), "{}\n")
# Expected plan after Pebble ready with default config
expected_plan = {
"services": {
"httpbin": {
"override": "replace",
"summary": "httpbin",
"command": "gunicorn -b 0.0.0.0:80 httpbin:app -k gevent",
"startup": "enabled",
"environment": {"thing": "🎁"},
}
},
}
# Get the httpbin container from the model
container = self.harness.model.unit.get_container("httpbin")
# Emit the PebbleReadyEvent carrying the httpbin container
self.harness.charm.on.httpbin_pebble_ready.emit(container)
# Get the plan now we've run PebbleReady
updated_plan = self.harness.get_container_pebble_plan("httpbin").to_dict()
# Check we've got the plan we expected
self.assertEqual(expected_plan, updated_plan)
# Check the service was started
service = self.harness.model.unit.get_container("httpbin").get_service("httpbin")
self.assertTrue(service.is_running())
# Ensure we set an ActiveStatus with no message
self.assertEqual(self.harness.model.unit.status, ActiveStatus())