[ARIA-271] Parameter.value should verify the type of an evaluation

• Type: Story
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Epic Link: ARIA 1.0 Release
• Assignee: Unassigned
• Reporter: Tal Liron
• Created: 30/May/17 16:33
• Updated: 03/Oct/17 20:01

Description

Currently, it is possible to have a parameter with an intrinsic function that return a type which is different from what the parameter has been configured for. Example:

node_types:
  WebApp:
    derived_from: tosca.nodes.WebApplication
    properties:
      port:
        type: integer
    interfaces:
      Standard:
        start:
          inputs:
            arg1:
              type: string

topology_template:
  node_templates:
    web_app:
      type: WebApp
      properties:
        port: 9090
      interfaces:
        Standard:
          start: scripts/start.sh
            inputs:
              arg1: { get_property: [ SELF, port ] }

This can lead to subtle errors. In the above, arg1 is a string, but the get_property function returns an int. No error is currently reported. (In many cases Python will coerce the value dynamically, but in some cases it may not.)