heat_template_version: 2016-04-08

description: >
  Utility stack to convert an array of services into a set of combined
  role configs.

parameters:
  Services:
    default: []
    description: |
        List nested stack service templates.
    type: comma_delimited_list
  EndpointMap:
    default: {}
    description: Mapping of service endpoint -> protocol. Typically set
                 via parameter_defaults in the resource registry.
    type: json

resources:

  ServiceChain:
    type: OS::Heat::ResourceChain
    properties:
      resources: {get_param: Services}
      concurrent: true
      resource_properties:
        EndpointMap: {get_param: EndpointMap}

outputs:
  role_data:
    description: Combined Role data for this set of services.
    value:
      service_names: {get_attr: [ServiceChain, role_data, service_name]}
      config_settings: {map_merge: {get_attr: [ServiceChain, role_data, config_settings]}}
      step_config: {list_join: ["\n", {get_attr: [ServiceChain, role_data, step_config]}]}