installers/charm/mon/src/charm.py

   1 #!/usr/bin/env python3
   2 # Copyright 2021 Canonical Ltd.
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License"); you may
   5 # not use this file except in compliance with the License. You may obtain
   6 # a copy of the License at
   7 #
   8 #         http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  12 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  13 # License for the specific language governing permissions and limitations
  14 # under the License.
  15 #
  16 # For those usages not covered by the Apache License, Version 2.0 please
  17 # contact: legal@canonical.com
  18 #
  19 # To get in touch with the maintainers, please contact:
  20 # osm-charmers@lists.launchpad.net
  21 ##
  22
  23 # pylint: disable=E0213
  24
  25
  26 import logging
  27 from typing import NoReturn
  28
  29 from ops.main import main
  30
  31 from opslib.osm.charm import CharmedOsmBase, RelationsMissing
  32
  33 from opslib.osm.pod import (
  34     ContainerV3Builder,
  35     PodSpecV3Builder,
  36 )
  37
  38 from opslib.osm.validator import (
  39     ModelValidator,
  40     validator,
  41 )
  42
  43 from opslib.osm.interfaces.kafka import KafkaClient
  44 from opslib.osm.interfaces.mongo import MongoClient
  45 from opslib.osm.interfaces.prometheus import PrometheusClient
  46
  47
  48 logger = logging.getLogger(__name__)
  49
  50 PORT = 8000
  51
  52
  53 class ConfigModel(ModelValidator):
  54     vca_host: str
  55     vca_user: str
  56     vca_password: str
  57     vca_cacert: str
  58     database_commonkey: str
  59     log_level: str
  60     openstack_default_granularity: int
  61     global_request_timeout: int
  62     collector_interval: int
  63     evaluator_interval: int
  64     grafana_url: str
  65     grafana_user: str
  66     grafana_password: str
  67
  68     @validator("log_level")
  69     def validate_log_level(cls, v):
  70         if v not in {"INFO", "DEBUG"}:
  71             raise ValueError("value must be INFO or DEBUG")
  72         return v
  73
  74
  75 class MonCharm(CharmedOsmBase):
  76     def __init__(self, *args) -> NoReturn:
  77         super().__init__(*args, oci_image="image")
  78
  79         self.kafka_client = KafkaClient(self, "kafka")
  80         self.framework.observe(self.on["kafka"].relation_changed, self.configure_pod)
  81         self.framework.observe(self.on["kafka"].relation_broken, self.configure_pod)
  82
  83         self.mongodb_client = MongoClient(self, "mongodb")
  84         self.framework.observe(self.on["mongodb"].relation_changed, self.configure_pod)
  85         self.framework.observe(self.on["mongodb"].relation_broken, self.configure_pod)
  86
  87         self.prometheus_client = PrometheusClient(self, "prometheus")
  88         self.framework.observe(
  89             self.on["prometheus"].relation_changed, self.configure_pod
  90         )
  91         self.framework.observe(
  92             self.on["prometheus"].relation_broken, self.configure_pod
  93         )
  94
  95     def _check_missing_dependencies(self, config: ConfigModel):
  96         missing_relations = []
  97
  98         if self.kafka_client.is_missing_data_in_unit():
  99             missing_relations.append("kafka")
 100         if self.mongodb_client.is_missing_data_in_unit():
 101             missing_relations.append("mongodb")
 102         if self.prometheus_client.is_missing_data_in_app():
 103             missing_relations.append("prometheus")
 104
 105         if missing_relations:
 106             raise RelationsMissing(missing_relations)
 107
 108     def build_pod_spec(self, image_info):
 109         # Validate config
 110         config = ConfigModel(**dict(self.config))
 111         # Check relations
 112         self._check_missing_dependencies(config)
 113         # Create Builder for the PodSpec
 114         pod_spec_builder = PodSpecV3Builder()
 115         # Build Container
 116         container_builder = ContainerV3Builder(self.app.name, image_info)
 117         container_builder.add_port(name=self.app.name, port=PORT)
 118         container_builder.add_envs(
 119             {
 120                 # General configuration
 121                 "ALLOW_ANONYMOUS_LOGIN": "yes",
 122                 "OSMMON_OPENSTACK_DEFAULT_GRANULARITY": config.openstack_default_granularity,
 123                 "OSMMON_GLOBAL_REQUEST_TIMEOUT": config.global_request_timeout,
 124                 "OSMMON_GLOBAL_LOGLEVEL": config.log_level,
 125                 "OSMMON_COLLECTOR_INTERVAL": config.collector_interval,
 126                 "OSMMON_EVALUATOR_INTERVAL": config.evaluator_interval,
 127                 # Kafka configuration
 128                 "OSMMON_MESSAGE_DRIVER": "kafka",
 129                 "OSMMON_MESSAGE_HOST": self.kafka_client.host,
 130                 "OSMMON_MESSAGE_PORT": self.kafka_client.port,
 131                 # Database configuration
 132                 "OSMMON_DATABASE_DRIVER": "mongo",
 133                 "OSMMON_DATABASE_URI": self.mongodb_client.connection_string,
 134                 "OSMMON_DATABASE_COMMONKEY": config.database_commonkey,
 135                 # Prometheus configuration
 136                 "OSMMON_PROMETHEUS_URL": f"http://{self.prometheus_client.hostname}:{self.prometheus_client.port}",
 137                 # VCA configuration
 138                 "OSMMON_VCA_HOST": config.vca_host,
 139                 "OSMMON_VCA_USER": config.vca_user,
 140                 "OSMMON_VCA_SECRET": config.vca_password,
 141                 "OSMMON_VCA_CACERT": config.vca_cacert,
 142                 "OSMMON_GRAFANA_URL": config.grafana_url,
 143                 "OSMMON_GRAFANA_USER": config.grafana_user,
 144                 "OSMMON_GRAFANA_PASSWORD": config.grafana_password,
 145             }
 146         )
 147
 148         container = container_builder.build()
 149         # Add container to pod spec
 150         pod_spec_builder.add_container(container)
 151         return pod_spec_builder.build()
 152
 153
 154 if __name__ == "__main__":
 155     main(MonCharm)