charm-openstack-dashboard/hooks/horizon-relations

#!/bin/bash
set -e

CHARM_DIR=$(dirname $0)
ARG0=${0##*/}

if [[ -e $CHARM_DIR/horizon-common ]] ; then
  . $CHARM_DIR/horizon-common
else
  echo "ERROR: Could not load horizon-common from $CHARM_DIR"
fi

function install_hook {
  configure_install_source "$(config-get openstack-origin)"
  apt-get update
  juju-log "$CHARM: Installing $PACKAGES."
  DEBIAN_FRONTEND=noninteractive apt-get -y install $PACKAGES
  set_or_update CACHE_BACKEND "memcached://127.0.0.1:11211/"
  open-port 80
}

function db_joined {
  # TODO
  # relation-set database, username, hostname 
  return 0
}

function db_changed {
  # TODO
  # relation-get password, private-address
  return 0
}

function keystone_joined {
  # service=None lets keystone know we don't need anything entered
  # into the service catalog.  we only really care about getting the
  # private-address from the relation
  local relid="$1"
  local rarg=""
  [[ -n "$relid" ]] && rarg="-r $relid"
  relation-set $rarg service="None" region="None" public_url="None" \
               admin_url="None" internal_url="None" \
               requested_roles="$(config-get default-role)"
}

function keystone_changed {
  local service_host=$(relation-get service_host)
  local service_port=$(relation-get service_port)
  if [ -z "${service_host}" ] || [ -z "${service_port}" ]; then
    juju-log "Insufficient information to configure keystone url"
    exit 0
  fi
  service_url="http://${service_host}:${service_port}/v2.0"
  juju-log "$CHARM: Configuring Horizon to access keystone @ $service_url."
  set_or_update OPENSTACK_KEYSTONE_URL "$service_url"
  service apache2 restart
}

function config_changed {
  local install_src=$(config-get openstack-origin)
  local cur=$(get_os_codename_package "openstack-dashboard")
  local available=$(get_os_codename_install_source "$install_src")

  if dpkg --compare-versions $(get_os_version_codename "$cur") lt \
                             $(get_os_version_codename "$available") ; then
    juju-log "$CHARM: Upgrading OpenStack release: $cur -> $available."
    do_openstack_upgrade "$install_src" $PACKAGES
  fi

  # update the web root for the horizon app.
  local web_root=$(config-get webroot)
  juju-log "$CHARM: Setting web root for Horizon to $web_root".
  cp /etc/apache2/conf.d/openstack-dashboard.conf \
    /var/lib/juju/openstack-dashboard.conf.last
  awk -v root="$web_root" \
    '/^WSGIScriptAlias/{$2 = root }'1 \
    /var/lib/juju/openstack-dashboard.conf.last \
    >/etc/apache2/conf.d/openstack-dashboard.conf
  set_or_update LOGIN_URL "$web_root/auth/login"
  set_or_update LOGIN_REDIRECT_URL "$web_root"

  # Save our scriptrc env variables for health checks
  declare -a env_vars=(
      'OPENSTACK_URL_HORIZON_CHECK=http://localhost/$web_root|Login - Openstack'
      'OPENSTACK_SERVICE_HORIZON=apache2'
      'OPENSTACK_PORT_HORIZON=80')
  save_script_rc ${env_vars[@]}


  # Set default role and trigger a identity-service relation event to
  # ensure role is created in keystone.
  set_or_update OPENSTACK_KEYSTONE_DEFAULT_ROLE "$(config-get default-role)"
  local relids="$(relation-ids identity-service)"
  for relid in $relids ; do
    keystone_joined "$relid"
  done

  service apache2 reload

}

function cluster_changed() {
  configure_haproxy "openstack_dashboard:80"
  configure_memcached
}

function ha_relation_joined() {
  local corosync_bindiface=`config-get ha-bindiface`
  local corosync_mcastport=`config-get ha-mcastport`
  local vip=`config-get vip`
  local vip_iface=`config-get vip_iface`
  local vip_cidr=`config-get vip_cidr`
  if [ -n "$vip" ] && [ -n "$vip_iface" ] && \
     [ -n "$vip_cidr" ] && [ -n "$corosync_bindiface" ] && \
     [ -n "$corosync_mcastport" ]; then
    # TODO: This feels horrible but the data required by the hacluster
    # charm is quite complex and is python ast parsed.
    resources="{
'res_horizon_vip':'ocf:heartbeat:IPaddr2',
'res_horizon_haproxy':'lsb:haproxy'
}"
    resource_params="{
'res_horizon_vip': 'params ip=\"$vip\" cidr_netmask=\"$vip_cidr\" nic=\"$vip_iface\"',
'res_horizon_haproxy': 'op monitor interval=\"5s\"'
}"
    init_services="{
'res_horizon_haproxy':'haproxy'
}"
    groups="{
'grp_horizon_haproxy':'res_horizon_vip res_horizon_haproxy'
}"
    relation-set corosync_bindiface=$corosync_bindiface \
      corosync_mcastport=$corosync_mcastport \
      resources="$resources" resource_params="$resource_params" \
      init_services="$init_services" groups="$groups"
  else
    juju-log "Insufficient configuration data to configure hacluster"
    exit 1
  fi
}


function ha_relation_changed() {
  local clustered=`relation-get clustered`
  if [ -n "$clustered" ]; then
    open-port 10080
  fi
}


juju-log "$CHARM: Running hook $ARG0."
case $ARG0 in
  "install") install_hook ;;
  "start") exit 0 ;;
  "stop") exit 0 ;;
  "shared-db-relation-joined") db_joined ;;
  "shared-db-relation-changed") db_changed;;
  "identity-service-relation-joined") keystone_joined;;
  "identity-service-relation-changed") keystone_changed;;
  "config-changed") config_changed;;
  "cluster-relation-changed") cluster_changed ;;
  "cluster-relation-departed") cluster_changed ;;
  "ha-relation-joined") ha_relation_joined ;;
  "ha-relation-changed") ha_relation_changed ;;
esac