heat_template_version: 2016-04-08

description: >
  This template demostrate how to use senlin resources to create
  a flexible cluster.

parameters:
  flavor:
    description: Flavor for the instances to be created.
    type: string
    default: m1.nano
  image:
    description: Name or ID of the image to use for the instances.
    type: string
    default: cirros-0.3.4-x86_64-uec
  key_name:
    description: Name of an existing key pair to use for the instances.
    type: string
  network:
    description: The network for the instances.
    type: string
    default: private

resources:
  profile:
    type: OS::Senlin::Profile
    properties:
      type: os.nova.server-1.0
      properties:
        flavor: {get_param: flavor}
        image: {get_param: image}
        key_name: {get_param: key_name}
        networks:
          - network: {get_param: network}

  cluster:
    type: OS::Senlin::Cluster
    properties:
      desired_capacity: 1
      profile: {get_resource: profile}

  scale_in_policy:
    type: OS::Senlin::Policy
    properties:
      type: senlin.policy.scaling-1.0
      bindings:
        - cluster: {get_resource: cluster}
      properties:
        event: CLUSTER_SCALE_IN
        adjustment:
          type: CHANGE_IN_CAPACITY
          number: 1

  scale_out_policy:
    type: OS::Senlin::Policy
    properties:
      type: senlin.policy.scaling-1.0
      bindings:
        - cluster: {get_resource: cluster}
      properties:
        event: CLUSTER_SCALE_OUT
        adjustment:
          type: CHANGE_IN_CAPACITY
          number: 1

  receiver_scale_out:
    type: OS::Senlin::Receiver
    properties:
      cluster: {get_resource: cluster}
      action: CLUSTER_SCALE_OUT
      type: webhook

  receiver_scale_in:
    type: OS::Senlin::Receiver
    properties:
      cluster: {get_resource: cluster}
      action: CLUSTER_SCALE_IN
      type: webhook

outputs:
  webhook_scale_out:
    description: Webhook to scale out cluster.
    value:
      str_replace:
        template: curl -X POST LINK
        params:
          LINK: {get_attr: [receiver_scale_out, channel, alarm_url]}

  webhook_scale_in:
    description: Webhook to scale in cluster.
    value:
      str_replace:
        template: curl -X POST LINK
        params:
          LINK: {get_attr: [receiver_scale_in, channel, alarm_url]}