text: # Copyright 2020 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.
  
  import charms_openstack.charm as charm
  import charms.reactive as reactive
  
  # This charm's library contains all of the handler code for this charm
  import charm.openstack.trilio_wlm as trilio_wlm  # noqa
  
  charm.use_defaults(
      "charm.installed",
      "amqp.connected",
      "shared-db.connected",
      "identity-service.available",  # enables SSL support
      "config.changed",
      "update-status",
      "certificates.available",
      "cluster.available",
  )
  
  
  @reactive.when("shared-db.available")
  @reactive.when("identity-service.available")
  @reactive.when("amqp.available")
  def render_config(*args):
      """Render the configuration for charm when all the interfaces are
      available.
      """
      with charm.provide_charm_instance() as charm_class:
          charm_class.upgrade_if_available(args)
          charm_class.render_with_interfaces(args)
          charm_class.assess_status()
      reactive.set_state("config.rendered")
  
  
  @reactive.when("config.rendered")
  def init_db():
      with charm.provide_charm_instance() as charm_class:
          charm_class.db_sync()
  
  
  @reactive.when("ha.connected")
  def cluster_connected(hacluster):
      """Configure HA resources in corosync"""
      with charm.provide_charm_instance() as charm_class:
          charm_class.configure_ha_resources(hacluster)
          charm_class.assess_status()
  
  
  @reactive.when("identity-service.connected")
  def register_endpoints_and_request_notification(identity_service):
      """Register endpoints and request notification.
  
      Note: In order to pass the requested role(s), we must override the default
      openstack-api layer setup_endpoint_connection version of this handler.
      """
      with charm.provide_charm_instance() as instance:
          identity_service.request_notification(instance.required_services)
          identity_service.register_endpoints(
              instance.service_type,
              instance.region,
              instance.public_url,
              instance.internal_url,
              instance.admin_url,
              requested_roles=[instance.options.trustee_role])
          instance.assess_status()
  
  
  @reactive.when_any("config.changed.triliovault-pkg-source",
                     "config.changed.openstack-origin")
  def install_source_changed():
      """Trigger re-install of charm if source configuration options change"""
      reactive.clear_flag("charm.installed")
      reactive.set_flag("upgrade.triliovault")
  