| #!/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 MON charm. |
| |
| See more: https://charmhub.io/osm |
| """ |
| |
| import logging |
| from typing import Any, Dict |
| |
| from charms.data_platform_libs.v0.data_interfaces import DatabaseRequires |
| from charms.kafka_k8s.v0.kafka import KafkaRequires, _KafkaAvailableEvent |
| from charms.observability_libs.v1.kubernetes_service_patch import KubernetesServicePatch |
| from charms.osm_libs.v0.utils import ( |
| CharmError, |
| DebugMode, |
| HostPath, |
| check_container_ready, |
| check_service_active, |
| ) |
| from charms.osm_vca_integrator.v0.vca import VcaDataChangedEvent, VcaRequires |
| from lightkube.models.core_v1 import ServicePort |
| from ops.charm import ActionEvent, CharmBase, CharmEvents |
| from ops.framework import EventSource, StoredState |
| from ops.main import main |
| from ops.model import ActiveStatus, Container |
| |
| from legacy_interfaces import KeystoneClient, PrometheusClient |
| |
| HOSTPATHS = [ |
| HostPath( |
| config="mon-hostpath", |
| container_path="/usr/lib/python3/dist-packages/osm_mon", |
| ), |
| HostPath( |
| config="common-hostpath", |
| container_path="/usr/lib/python3/dist-packages/osm_common", |
| ), |
| HostPath( |
| config="n2vc-hostpath", |
| container_path="/usr/lib/python3/dist-packages/n2vc", |
| ), |
| ] |
| SERVICE_PORT = 8000 |
| |
| logger = logging.getLogger(__name__) |
| |
| |
| class MonEvents(CharmEvents): |
| """MON events.""" |
| |
| vca_data_changed = EventSource(VcaDataChangedEvent) |
| kafka_available = EventSource(_KafkaAvailableEvent) |
| |
| |
| class OsmMonCharm(CharmBase): |
| """OSM MON Kubernetes sidecar charm.""" |
| |
| on = MonEvents() |
| _stored = StoredState() |
| container_name = "mon" |
| service_name = "mon" |
| |
| def __init__(self, *args): |
| super().__init__(*args) |
| self.kafka = KafkaRequires(self) |
| self.mongodb_client = DatabaseRequires(self, "mongodb", database_name="osm") |
| self.prometheus_client = PrometheusClient(self, "prometheus") |
| self.keystone_client = KeystoneClient(self, "keystone") |
| self.vca = VcaRequires(self) |
| self._observe_charm_events() |
| self.container: Container = self.unit.get_container(self.container_name) |
| self.debug_mode = DebugMode(self, self._stored, self.container, HOSTPATHS) |
| self._patch_k8s_service() |
| |
| @property |
| def external_hostname(self) -> str: |
| """External hostname property. |
| |
| Returns: |
| str: the external hostname from config. |
| If not set, return the ClusterIP service name. |
| """ |
| return self.config.get("external-hostname") or self.app.name |
| |
| # --------------------------------------------------------------------------- |
| # Handlers for Charm Events |
| # --------------------------------------------------------------------------- |
| |
| def _on_config_changed(self, _) -> None: |
| """Handler for the config-changed event.""" |
| try: |
| self._validate_config() |
| self._check_relations() |
| # Check if the container is ready. |
| # Eventually it will become ready after the first pebble-ready event. |
| check_container_ready(self.container) |
| if not self.debug_mode.started: |
| self._configure_service(self.container) |
| # Update charm status |
| self._on_update_status() |
| except CharmError as e: |
| logger.debug(e.message) |
| self.unit.status = e.status |
| |
| def _on_update_status(self, _=None) -> None: |
| """Handler for the update-status event.""" |
| try: |
| self._validate_config() |
| self._check_relations() |
| check_container_ready(self.container) |
| if self.debug_mode.started: |
| return |
| check_service_active(self.container, self.service_name) |
| self.unit.status = ActiveStatus() |
| except CharmError as e: |
| logger.debug(e.message) |
| self.unit.status = e.status |
| |
| def _on_required_relation_broken(self, _) -> None: |
| """Handler for the kafka-broken event.""" |
| 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() |
| |
| def _on_get_debug_mode_information_action(self, event: ActionEvent) -> None: |
| """Handler for the get-debug-mode-information action event.""" |
| if not self.debug_mode.started: |
| event.fail("debug-mode has not started. Hint: juju config mon debug-mode=true") |
| return |
| |
| debug_info = { |
| "command": self.debug_mode.command, |
| "password": self.debug_mode.password, |
| } |
| event.set_results(debug_info) |
| |
| # --------------------------------------------------------------------------- |
| # Validation and configuration and more |
| # --------------------------------------------------------------------------- |
| |
| def _observe_charm_events(self) -> None: |
| event_handler_mapping = { |
| # Core lifecycle events |
| self.on.mon_pebble_ready: self._on_config_changed, |
| self.on.config_changed: self._on_config_changed, |
| self.on.update_status: self._on_update_status, |
| # Relation events |
| self.on.vca_data_changed: self._on_config_changed, |
| self.on.kafka_available: self._on_config_changed, |
| self.on["kafka"].relation_broken: self._on_required_relation_broken, |
| self.mongodb_client.on.database_created: self._on_config_changed, |
| self.on["mongodb"].relation_broken: self._on_required_relation_broken, |
| # Action events |
| self.on.get_debug_mode_information_action: self._on_get_debug_mode_information_action, |
| } |
| for relation in [self.on[rel_name] for rel_name in ["prometheus", "keystone"]]: |
| 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 _is_database_available(self) -> bool: |
| try: |
| return self.mongodb_client.is_resource_created() |
| except KeyError: |
| return False |
| |
| 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.kafka.host or not self.kafka.port: |
| missing_relations.append("kafka") |
| if not self._is_database_available(): |
| missing_relations.append("mongodb") |
| if self.prometheus_client.is_missing_data_in_app(): |
| missing_relations.append("prometheus") |
| if self.keystone_client.is_missing_data_in_app(): |
| missing_relations.append("keystone") |
| |
| 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 _configure_service(self, container: Container) -> None: |
| """Add Pebble layer with the mon service.""" |
| logger.debug(f"configuring {self.app.name} service") |
| container.add_layer("mon", self._get_layer(), combine=True) |
| container.replan() |
| |
| def _get_layer(self) -> Dict[str, Any]: |
| """Get layer for Pebble.""" |
| environment = { |
| # General configuration |
| "OSMMON_GLOBAL_LOGLEVEL": self.config["log-level"], |
| "OSMMON_OPENSTACK_DEFAULT_GRANULARITY": self.config["openstack-default-granularity"], |
| "OSMMON_GLOBAL_REQUEST_TIMEOUT": self.config["global-request-timeout"], |
| "OSMMON_COLLECTOR_INTERVAL": self.config["collector-interval"], |
| "OSMMON_EVALUATOR_INTERVAL": self.config["evaluator-interval"], |
| "OSMMON_COLLECTOR_VM_INFRA_METRICS": self.config["vm-infra-metrics"], |
| # Kafka configuration |
| "OSMMON_MESSAGE_DRIVER": "kafka", |
| "OSMMON_MESSAGE_HOST": self.kafka.host, |
| "OSMMON_MESSAGE_PORT": self.kafka.port, |
| # Database configuration |
| "OSMMON_DATABASE_DRIVER": "mongo", |
| "OSMMON_DATABASE_URI": self._get_mongodb_uri(), |
| "OSMMON_DATABASE_COMMONKEY": self.config["database-commonkey"], |
| # Prometheus/grafana configuration |
| "OSMMON_PROMETHEUS_URL": f"http://{self.prometheus_client.hostname}:{self.prometheus_client.port}", |
| "OSMMON_PROMETHEUS_USER": self.prometheus_client.user, |
| "OSMMON_PROMETHEUS_PASSWORD": self.prometheus_client.password, |
| "OSMMON_GRAFANA_URL": self.config["grafana-url"], |
| "OSMMON_GRAFANA_USER": self.config["grafana-user"], |
| "OSMMON_GRAFANA_PASSWORD": self.config["grafana-password"], |
| "OSMMON_KEYSTONE_ENABLED": self.config["keystone-enabled"], |
| "OSMMON_KEYSTONE_URL": self.keystone_client.host, |
| "OSMMON_KEYSTONE_DOMAIN_NAME": self.keystone_client.user_domain_name, |
| "OSMMON_KEYSTONE_SERVICE_PROJECT": self.keystone_client.service, |
| "OSMMON_KEYSTONE_SERVICE_USER": self.keystone_client.username, |
| "OSMMON_KEYSTONE_SERVICE_PASSWORD": self.keystone_client.password, |
| "OSMMON_KEYSTONE_SERVICE_PROJECT_DOMAIN_NAME": self.keystone_client.project_domain_name, |
| } |
| logger.info(f"{environment}") |
| if self.vca.data: |
| environment["OSMMON_VCA_HOST"] = self.vca.data.endpoints |
| environment["OSMMON_VCA_SECRET"] = self.vca.data.secret |
| environment["OSMMON_VCA_USER"] = self.vca.data.user |
| environment["OSMMON_VCA_CACERT"] = self.vca.data.cacert |
| return { |
| "summary": "mon layer", |
| "description": "pebble config layer for mon", |
| "services": { |
| self.service_name: { |
| "override": "replace", |
| "summary": "mon service", |
| "command": "/bin/bash -c 'cd /app/osm_mon/ && /bin/bash start.sh'", |
| "startup": "enabled", |
| "user": "appuser", |
| "group": "appuser", |
| "working-dir": "/app/osm_mon", # This parameter has no effect in Juju 2.9.x |
| "environment": environment, |
| } |
| }, |
| } |
| |
| def _get_mongodb_uri(self): |
| return list(self.mongodb_client.fetch_relation_data().values())[0]["uris"] |
| |
| def _patch_k8s_service(self) -> None: |
| port = ServicePort(SERVICE_PORT, name=f"{self.app.name}") |
| self.service_patcher = KubernetesServicePatch(self, [port]) |
| |
| |
| if __name__ == "__main__": # pragma: no cover |
| main(OsmMonCharm) |