constraints.yaml

tosca_definitions_version: tosca_simple_yaml_1_3

# To apply the constraints run:
#   puccini-tosca compile --coerce examples/javascript/constraints.yaml

# Also see: functions.yaml

metadata:

  template_name: JavaScript Constraints Example
  template_author: Puccini

  # Use metadata prefixed with "puccini.scriptlet:tosca.constraint."
  # Your scriptlet must export a function named "validate"
  # The first argument is always the value to validate
  # Return "true" if valid
  # If invalid, can return "false" or a string explaining the reason it is invalid
  # (Note that this is different from "throw", which should be used for errors)
  puccini.scriptlet:tosca.constraint.multiple_of: |-
    exports.validate = function(value, multiple) {
      if (arguments.length !== 2)
        throw 'must have 1 argument';
      return (value / multiple) % 1 == 0;
    };

node_types:

  Rack:
    properties:
      slots:
        type: integer
        constraints:
        # Our custom constraint
        - multiple_of: 4

topology_template:

  node_templates:

    rack:
      type: Rack
      properties:
        slots: 8