Merge ~axino/charm-canonical-is-reviewbot/+git/charm-canonical-is-reviewbot:axino into charm-canonical-is-reviewbot:main

[Junien F]

initial commit

[Barry Price (barryprice)]

Tiny nitpick inline, LGTM otherwise

review: Approve

[Junien F (axino)]

Fixed, thanks !

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change has no commit message, setting status to needs review.

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision 9763831c66fb1ba544d4b657de58f8bac49ee979

diff --git a/.gitignore b/.gitignore
 new file mode 100644
index 0000000..a26d707
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+venv/
+build/
+*.charm
+.tox/
+.coverage
+__pycache__/
+*.py[cod]
+.idea
+.vscode/
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
 new file mode 100644
index 0000000..2969183
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,33 @@
+# Contributing
+
+To make contributions to this charm, you'll need a working [development setup](https://juju.is/docs/sdk/dev-setup).
+
+You can use the environments created by `tox` for development:
+
+```shell
+tox --notest -e unit
+source .tox/unit/bin/activate
+```
+
+## Testing
+
+This project uses `tox` for managing test environments. There are some pre-configured environments
+that can be used for linting and formatting code when you're preparing contributions to the charm:
+
+```shell
+tox -e fmt           # update your code according to linting rules
+tox -e lint          # code style
+tox -e unit          # unit tests
+tox -e integration   # integration tests
+tox                  # runs 'lint' and 'unit' environments
+```
+
+## Build the charm
+
+Build the charm in this git repository using:
+
+```shell
+charmcraft pack
+```
+
+<!-- You may want to include any contribution/style guidelines in this document>
diff --git a/LICENSE b/LICENSE
 new file mode 100644
index 0000000..ecbda55
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
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+   Copyright 2022 Ubuntu
+
+   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
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+   Unless required by applicable law or agreed to in writing, software
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diff --git a/README.md b/README.md
 new file mode 100644
index 0000000..6cca19d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# charm-canonical-is-reviewbot
+
+Charmhub package name: mm-reviewbot-charmers-canonical-is-reviewbot
+More information: https://charmhub.io/mm-reviewbot-charmers-canonical-is-reviewbot
+
+This charm deploys the Canonical IS reviewbot, which helps doing reviews of
+Launchpad merge proposals for the IS team.
diff --git a/charmcraft.yaml b/charmcraft.yaml
 new file mode 100644
index 0000000..900d34a
--- /dev/null
+++ b/charmcraft.yaml
@@ -0,0 +1,11 @@
+# This file configures Charmcraft.
+# See https://juju.is/docs/sdk/charmcraft-config for guidance.
+
+type: charm
+bases:
+  - build-on:
+    - name: ubuntu
+      channel: "22.04"
+    run-on:
+    - name: ubuntu
+      channel: "22.04"
diff --git a/config.yaml b/config.yaml
 new file mode 100644
index 0000000..79e1a0d
--- /dev/null
+++ b/config.yaml
@@ -0,0 +1,30 @@
+# This file defines charm config options, and populates the Configure tab on Charmhub.
+# If your charm does not require configuration options, delete this file entirely.
+#
+# See https://juju.is/docs/config for guidance.
+
+options:
+  launchpad_secret:
+    description: "Launchpad credential secret"
+    default: ""
+    type: string
+  launchpad_token:
+    description: "Launchpad credential token"
+    default: ""
+    type: string
+  mattermost_token:
+    description: "Mattermost API token"
+    default: ""
+    type: string
+  mattermost_channel:
+    description: "Mattermost channel in which to expect review requests"
+    default: ""
+    type: string
+  mattermost_url:
+    description: "Mattermost URL"
+    default: ""
+    type: string
+  mattermost_team:
+    description: "Mattermost team"
+    default: ""
+    type: string
diff --git a/metadata.yaml b/metadata.yaml
 new file mode 100644
index 0000000..83d6842
--- /dev/null
+++ b/metadata.yaml
@@ -0,0 +1,18 @@
+name: canonical-is-reviewbot
+display-name: Mattermost Review Bot
+summary: MatterMost Review Bot charm
+maintainers:
+  - https://launchpad.net/~mm-reviewbot-charmers
+description: |
+  A charm which deploys Mattermost Review Bot on kubernetes.
+  Mattermost is a flexible, open source messaging platform that enables
+  secure team collaboration.
+  This bot allows reviewing Launchpad merge proposals on Mattermost
+containers:
+  reviewbot:
+    resource: reviewbot-image
+resources:
+  reviewbot-image:
+    type: oci-image
+    description: Reviewbot docker image
+    auto-fetch: true
diff --git a/pyproject.toml b/pyproject.toml
 new file mode 100644
index 0000000..3f51442
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,39 @@
+# Testing tools configuration
+[tool.coverage.run]
+branch = true
+
+[tool.coverage.report]
+show_missing = true
+
+[tool.pytest.ini_options]
+minversion = "6.0"
+log_cli_level = "INFO"
+
+# Formatting tools configuration
+[tool.black]
+line-length = 99
+target-version = ["py38"]
+
+# Linting tools configuration
+[tool.ruff]
+line-length = 99
+select = ["E", "W", "F", "C", "N", "D", "I001"]
+extend-ignore = [
+    "D203",
+    "D204",
+    "D213",
+    "D215",
+    "D400",
+    "D404",
+    "D406",
+    "D407",
+    "D408",
+    "D409",
+    "D413",
+]
+ignore = ["E501", "D107"]
+extend-exclude = ["__pycache__", "*.egg_info"]
+per-file-ignores = {"tests/*" = ["D100","D101","D102","D103","D104"]}
+
+[tool.ruff.mccabe]
+max-complexity = 10
diff --git a/requirements.txt b/requirements.txt
 new file mode 100644
index 0000000..56f5f64
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+ops >= 1.5.0
diff --git a/src/charm.py b/src/charm.py
 new file mode 100755
index 0000000..e2bf66d
--- /dev/null
+++ b/src/charm.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+# Copyright 2022 Ubuntu
+# 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.main import main
+from ops.model import ActiveStatus, BlockedStatus, WaitingStatus
+
+# Log messages can be retrieved using juju debug-log
+logger = logging.getLogger(__name__)
+
+VALID_LOG_LEVELS = ["info", "debug", "warning", "error", "critical"]
+
+
+class CharmReviewbotCharm(CharmBase):
+    """Charm the service."""
+
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.framework.observe(self.on.reviewbot_pebble_ready, self._on_reviewbot_pebble_ready)
+        self.framework.observe(self.on.config_changed, self._on_config_changed)
+
+    def _missing_config(self):
+        # All config options must be set
+        missing_config = []
+        for k, v in self.model.config.items():
+            if not v:
+                missing_config.append(k)
+        return missing_config
+
+    def _on_reviewbot_pebble_ready(self, event):
+        """Define and start a workload using the Pebble API.
+
+        Change this example to suit your needs. You'll need to specify the right entrypoint and
+        environment configuration for your specific workload.
+
+        Learn more about interacting with Pebble at at https://juju.is/docs/sdk/pebble.
+        """
+        missing_config = self._missing_config()
+        if missing_config:
+            self.unit.status = BlockedStatus(f"required config not set: '{missing_config}'")
+            return
+        # Get a reference the container attribute on the PebbleReadyEvent
+        container = event.workload
+        # Add initial Pebble config layer using the Pebble API
+        container.add_layer("reviewbot", self._pebble_layer, combine=True)
+        # Make Pebble reevaluate its plan, ensuring any services are started if enabled.
+        container.replan()
+        # Learn more about statuses in the SDK docs:
+        # https://juju.is/docs/sdk/constructs#heading--statuses
+        self.unit.status = ActiveStatus()
+
+    def _get_reviewbot_env_config(self) -> dict:
+        """Return an envConfig with configuration."""
+        env_config = {
+            "REVIEWBOT_LP_SECRET": self.config["launchpad_secret"],
+            "REVIEWBOT_LP_TOKEN": self.config["launchpad_token"],
+            "REVIEWBOT_MM_CHANNEL": self.config["mattermost_channel"],
+            "REVIEWBOT_MM_TEAM": self.config["mattermost_team"],
+            "REVIEWBOT_MM_TOKEN": self.config["mattermost_token"],
+            "REVIEWBOT_MM_URL": self.config["mattermost_url"],
+            "HOME": "/home/reviewbot",  # work around https://github.com/canonical/pebble/issues/183
+        }
+
+        return env_config
+
+    def _on_config_changed(self, event):
+        """Handle changed configuration."""
+        missing_config = self._missing_config()
+        if missing_config:
+            self.unit.status = BlockedStatus(f"required config not set: '{missing_config}'")
+            return
+
+        # The config is good, so update the configuration of the workload
+        container = self.unit.get_container("reviewbot")
+        # Verify that we can connect to the Pebble API in the workload container
+        if container.can_connect():
+            # Push an updated layer with the new config
+            container.add_layer("reviewbot", self._pebble_layer, combine=True)
+            container.replan()
+
+            self.unit.status = ActiveStatus()
+        else:
+            # We were unable to connect to the Pebble API, so we defer this event
+            event.defer()
+            self.unit.status = WaitingStatus("waiting for Pebble API")
+
+    @property
+    def _pebble_layer(self):
+        """Return a dictionary representing a Pebble layer."""
+        return {
+            "summary": "reviewbot layer",
+            "description": "pebble config layer for reviewbot",
+            "services": {
+                "reviewbot": {
+                    "override": "replace",
+                    "summary": "reviewbot",
+                    "user": "reviewbot",
+                    "group": "reviewbot",
+                    "command": "/app/bot.py",
+                    "startup": "enabled",
+                    "environment": self._get_reviewbot_env_config(),
+                },
+            },
+        }
+
+
+if __name__ == "__main__":  # pragma: nocover
+    main(CharmReviewbotCharm)
diff --git a/tests/unit/test_charm.py b/tests/unit/test_charm.py
 new file mode 100644
index 0000000..3399c04
--- /dev/null
+++ b/tests/unit/test_charm.py
@@ -0,0 +1,108 @@
+# Copyright 2022 Ubuntu
+# See LICENSE file for licensing details.
+#
+# Learn more about testing at: https://juju.is/docs/sdk/testing
+
+import unittest
+
+import ops.testing
+from charm import CharmReviewbotCharm
+from ops.model import ActiveStatus, BlockedStatus, WaitingStatus
+from ops.testing import Harness
+
+
+class TestCharm(unittest.TestCase):
+    base_config = {
+        "launchpad_secret": "lps",
+        "launchpad_token": "lpt",
+        "mattermost_token": "mmtok",
+        "mattermost_channel": "mmc",
+        "mattermost_url": "mmu",
+        "mattermost_team": "mmt",
+    }
+
+    def setUp(self):
+        # Enable more accurate simulation of container networking.
+        # For more information, see https://juju.is/docs/sdk/testing#heading--simulate-can-connect
+        ops.testing.SIMULATE_CAN_CONNECT = True
+        self.addCleanup(setattr, ops.testing, "SIMULATE_CAN_CONNECT", False)
+
+        self.harness = Harness(CharmReviewbotCharm)
+        self.addCleanup(self.harness.cleanup)
+        self.harness.begin()
+
+    def test_reviewbot_pebble_ready(self):
+        # Expected plan after Pebble ready with default config
+        expected_plan = {
+            "services": {
+                "reviewbot": {
+                    "override": "replace",
+                    "summary": "reviewbot",
+                    "command": "/app/bot.py",
+                    "startup": "enabled",
+                    "environment": {
+                        "REVIEWBOT_LP_SECRET": "lps",
+                        "REVIEWBOT_LP_TOKEN": "lpt",
+                        "REVIEWBOT_MM_CHANNEL": "mmc",
+                        "REVIEWBOT_MM_TEAM": "mmt",
+                        "REVIEWBOT_MM_TOKEN": "mmtok",
+                        "REVIEWBOT_MM_URL": "mmu",
+                        "HOME": "/home/reviewbot",
+                    },
+                    "user": "reviewbot",
+                    "group": "reviewbot",
+                }
+            },
+        }
+        # Simulate the container coming up and emission of pebble-ready event
+        self.harness.update_config(self.base_config)
+        self.harness.container_pebble_ready("reviewbot")
+        # Get the plan now we've run PebbleReady
+        updated_plan = self.harness.get_container_pebble_plan("reviewbot").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("reviewbot").get_service("reviewbot")
+        self.assertTrue(service.is_running())
+        # Ensure we set an ActiveStatus with no message
+        self.assertEqual(self.harness.model.unit.status, ActiveStatus())
+
+    def test_reviewbot_pebble_ready_no_config(self):
+        # Expect an empty plan when a config item is missing
+        expected_plan = {}
+        # Simulate the container coming up and emission of pebble-ready event
+        self.harness.container_pebble_ready("reviewbot")
+        # Get the plan now we've run PebbleReady
+        updated_plan = self.harness.get_container_pebble_plan("reviewbot").to_dict()
+        # Check we've got the plan we expected
+        self.assertEqual(expected_plan, updated_plan)
+        # Ensure we got a BlockedStatus
+        self.assertIsInstance(self.harness.model.unit.status, BlockedStatus)
+
+    def test_config_changed_valid_can_connect(self):
+        # Ensure the simulated Pebble API is reachable
+        self.harness.set_can_connect("reviewbot", True)
+        # Trigger a config-changed event with an updated value
+        changed_config = self.base_config.copy()
+        changed_config["launchpad_secret"] = "CHANGED"
+        self.harness.update_config(changed_config)
+        # Get the plan now we've run PebbleReady
+        updated_plan = self.harness.get_container_pebble_plan("reviewbot").to_dict()
+        updated_env = updated_plan["services"]["reviewbot"]["environment"]
+        # Check the config change was effective
+        self.assertEqual(updated_env["REVIEWBOT_LP_SECRET"], "CHANGED")
+        self.assertEqual(self.harness.model.unit.status, ActiveStatus())
+
+    def test_config_changed_valid_cannot_connect(self):
+        # Trigger a config-changed event with an updated value
+        self.harness.update_config(self.base_config)
+        # Check the charm is in WaitingStatus
+        self.assertIsInstance(self.harness.model.unit.status, WaitingStatus)
+
+    def test_config_changed_invalid(self):
+        # Ensure the simulated Pebble API is reachable
+        self.harness.set_can_connect("reviewbot", True)
+        # Trigger a config-changed event with an updated value
+        self.harness.update_config({})
+        # Check the charm is in BlockedStatus
+        self.assertIsInstance(self.harness.model.unit.status, BlockedStatus)
diff --git a/tox.ini b/tox.ini
 new file mode 100644
index 0000000..d4284f8
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,84 @@
+# Copyright 2022 Ubuntu
+# See LICENSE file for licensing details.
+
+[tox]
+skipsdist=True
+skip_missing_interpreters = True
+envlist = fmt, lint, unit
+
+[vars]
+src_path = {toxinidir}/src/
+tst_path = {toxinidir}/tests/
+;lib_path = {toxinidir}/lib/charms/operator_name_with_underscores
+all_path = {[vars]src_path} {[vars]tst_path} 
+
+[testenv]
+setenv =
+  PYTHONPATH = {toxinidir}:{toxinidir}/lib:{[vars]src_path}
+  PYTHONBREAKPOINT=pdb.set_trace
+  PY_COLORS=1
+passenv =
+  PYTHONPATH
+  CHARM_BUILD_DIR
+  MODEL_SETTINGS
+
+[testenv:fmt]
+description = Apply coding style standards to code
+deps =
+    black
+    ruff
+commands =
+    black {[vars]all_path}
+    ruff --fix {[vars]all_path}
+
+[testenv:lint]
+description = Check code against coding style standards
+deps =
+    black
+    ruff
+    codespell
+commands =
+    # uncomment the following line if this charm owns a lib
+    # codespell {[vars]lib_path}
+    codespell {toxinidir} \
+              --skip {toxinidir}/.git \
+              --skip {toxinidir}/.tox \
+              --skip {toxinidir}/build \
+              --skip {toxinidir}/lib \
+              --skip {toxinidir}/venv \
+              --skip {toxinidir}/.mypy_cache \
+              --skip {toxinidir}/icon.svg
+    
+    ruff {[vars]all_path}
+    black --check --diff {[vars]all_path}
+
+[testenv:unit]
+description = Run unit tests
+deps =
+    pytest
+    coverage[toml]
+    -r{toxinidir}/requirements.txt
+commands =
+    coverage run --source={[vars]src_path} \
+                 -m pytest \
+                 --ignore={[vars]tst_path}integration \
+                 --tb native \
+                 -v \
+                 -s \
+                 {posargs}
+    coverage report
+
+[testenv:integration]
+description = Run integration tests
+deps =
+    pytest
+    juju
+    pytest-operator
+    -r{toxinidir}/requirements.txt
+commands =
+    pytest -v \
+           -s \
+           --tb native \
+           --ignore={[vars]tst_path}unit \
+           --log-cli-level=INFO \
+           {posargs}