| #!/usr/bin/env python3 |
| # Copyright 2022 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. |
| # |
| # For those usages not covered by the Apache License, Version 2.0 please |
| # contact: legal@canonical.com |
| # |
| # To get in touch with the maintainers, please contact: |
| # osm-charmers@lists.launchpad.net |
| # |
| # |
| # Learn more at: https://juju.is/docs/sdk |
| |
| """OSM Temporal charm. |
| |
| See more: https://charmhub.io/osm |
| """ |
| |
| import logging |
| import os |
| import socket |
| |
| from log import log_event_handler |
| from typing import Any, Dict |
| |
| from charms.observability_libs.v1.kubernetes_service_patch import KubernetesServicePatch |
| from charms.osm_libs.v0.utils import ( |
| CharmError, |
| check_container_ready, |
| check_service_active, |
| ) |
| from charms.osm_temporal.v0.temporal import TemporalProvides |
| from lightkube.models.core_v1 import ServicePort |
| from ops.charm import CharmBase, LeaderElectedEvent, RelationJoinedEvent |
| from ops.framework import StoredState |
| from ops.main import main |
| from ops.model import ActiveStatus, Container |
| |
| from legacy_interfaces import MysqlClient |
| |
| logger = logging.getLogger(__name__) |
| SERVICE_PORT = 7233 |
| |
| |
| class OsmTemporalCharm(CharmBase): |
| """OSM Temporal Kubernetes sidecar charm.""" |
| |
| _stored = StoredState() |
| container_name = "temporal" |
| service_name = "temporal" |
| |
| def __init__(self, *args): |
| super().__init__(*args) |
| |
| self.db_client = MysqlClient(self, "db") |
| self._observe_charm_events() |
| self.container: Container = self.unit.get_container(self.container_name) |
| self._stored.set_default(leader_ip="") |
| self._stored.set_default(unit_ip="") |
| self.temporal = TemporalProvides(self) |
| self._patch_k8s_service() |
| |
| # --------------------------------------------------------------------------- |
| # Handlers for Charm Events |
| # --------------------------------------------------------------------------- |
| |
| @log_event_handler(logger) |
| def _on_config_changed(self, event) -> None: |
| """Handler for the config-changed event.""" |
| try: |
| self._validate_config() |
| self._check_relations() |
| |
| if self.unit.is_leader(): |
| leader_ip_value = socket.gethostbyname(socket.gethostname()) |
| if leader_ip_value and leader_ip_value != self._stored.leader_ip: |
| self._stored.leader_ip = leader_ip_value |
| |
| unit_ip_value = socket.gethostbyname(socket.gethostname()) |
| if unit_ip_value and unit_ip_value != self._stored.unit_ip: |
| self._stored.unit_ip = unit_ip_value |
| |
| # Check if the container is ready. |
| # Eventually it will become ready after the first pebble-ready event. |
| check_container_ready(self.container) |
| self._configure_service(self.container) |
| self._update_temporal_relation() |
| |
| # Update charm status |
| self._on_update_status(event) |
| except CharmError as e: |
| logger.error(e.message) |
| self.unit.status = e.status |
| |
| @log_event_handler(logger) |
| def _on_update_status(self, _=None) -> None: |
| """Handler for the update-status event.""" |
| try: |
| self._validate_config() |
| self._check_relations() |
| check_service_active(self.container, self.service_name) |
| self.unit.status = ActiveStatus() |
| except CharmError as e: |
| logger.error(e.message) |
| self.unit.status = e.status |
| |
| @log_event_handler(logger) |
| def _on_required_relation_broken(self, event) -> None: |
| """Handler for the kafka-broken event.""" |
| # Check Pebble has started in the container |
| try: |
| check_container_ready(self.container) |
| check_service_active(self.container, self.service_name) |
| self.container.stop(self.container_name) |
| except CharmError: |
| pass |
| self._on_update_status(event) |
| |
| # --------------------------------------------------------------------------- |
| # Validation and configuration and more |
| # --------------------------------------------------------------------------- |
| |
| def _observe_charm_events(self) -> None: |
| event_handler_mapping = { |
| # Core lifecycle events |
| self.on.temporal_pebble_ready: self._on_config_changed, |
| self.on.config_changed: self._on_config_changed, |
| self.on.update_status: self._on_update_status, |
| self.on.temporal_relation_joined: self._update_temporal_relation, |
| } |
| |
| # Relation events |
| for relation in [self.on[rel_name] for rel_name in ["db"]]: |
| event_handler_mapping[relation.relation_changed] = self._on_config_changed |
| event_handler_mapping[relation.relation_broken] = self._on_required_relation_broken |
| |
| for event, handler in event_handler_mapping.items(): |
| self.framework.observe(event, handler) |
| |
| def _validate_config(self) -> None: |
| """Validate charm configuration. |
| |
| Raises: |
| CharmError: if charm configuration is invalid. |
| """ |
| logger.debug("validating charm config") |
| |
| def _check_relations(self) -> None: |
| """Validate charm relations. |
| |
| Raises: |
| CharmError: if charm configuration is invalid. |
| """ |
| logger.debug("check for missing relations") |
| missing_relations = [] |
| |
| if not self.config.get("mysql-uri") and self.db_client.is_missing_data_in_unit(): |
| missing_relations.append("db") |
| |
| if missing_relations: |
| relations_str = ", ".join(missing_relations) |
| one_relation_missing = len(missing_relations) == 1 |
| error_msg = f'need {relations_str} relation{"" if one_relation_missing else "s"}' |
| logger.warning(error_msg) |
| raise CharmError(error_msg) |
| |
| def _update_temporal_relation(self, event: RelationJoinedEvent = None) -> None: |
| """Handler for the temporal-relation-joined event.""" |
| logger.info(f"isLeader? {self.unit.is_leader()}") |
| if self.unit.is_leader(): |
| self.temporal.set_host_info( |
| self.app.name, SERVICE_PORT, event.relation if event else None |
| ) |
| logger.info(f"temporal host info set to {self.app.name} : {SERVICE_PORT}") |
| |
| def _patch_k8s_service(self) -> None: |
| port = ServicePort(SERVICE_PORT, name=f"{self.app.name}") |
| self.service_patcher = KubernetesServicePatch(self, [port]) |
| |
| def _configure_service(self, container: Container) -> None: |
| """Add Pebble layer with the temporal service.""" |
| logger.debug(f"configuring {self.app.name} service") |
| logger.info(f"{self._get_layer()}") |
| container.add_layer("temporal", self._get_layer(), combine=True) |
| container.replan() |
| |
| def _get_layer(self) -> Dict[str, Any]: |
| """Get layer for Pebble.""" |
| return { |
| "summary": "Temporal layer", |
| "description": "pebble config layer for Temporal", |
| "services": { |
| self.service_name: { |
| "override": "replace", |
| "summary": "temporal service", |
| "command": "/etc/temporal/entrypoint.sh autosetup", |
| "startup": "enabled", |
| "user": "root", |
| "group": "root", |
| "ports": [ |
| 7233, |
| ], |
| "environment": { |
| "DB": "mysql", |
| "DB_PORT": self.db_client.port, |
| "MYSQL_PWD": self.db_client.root_password, |
| "MYSQL_SEEDS": self.db_client.host, |
| "MYSQL_USER": "root", |
| "MYSQL_TX_ISOLATION_COMPAT": "true", |
| "BIND_ON_IP": "0.0.0.0", |
| "TEMPORAL_BROADCAST_ADDRESS": self._stored.unit_ip, |
| }, |
| }, |
| }, |
| } |
| |
| |
| if __name__ == "__main__": # pragma: no cover |
| main(OsmTemporalCharm) |