Coerce get_attribute referencing requirement

[Shishqa]

Hi!

Is there any way to access the requirement target from the source node?

Here the simple example, which does not work:

tosca_definitions_version: tosca_simple_yaml_1_3

topology_template:

  node_templates:

    server_2:
      type: tosca:Compute
      requirements:
        - dependency: server_1
      interfaces:
        Standard:
          operations:
            create:
              implementation: script.sh
              inputs:
                dependency_address: { get_attribute: [ SELF, dependency, 0, TARGET, public_address ] }

    server_1:
      type: tosca:Compute
      attributes:
        public_address: 1.1.1.1

Puccini gives

> puccini-tosca compile example.yaml --coerce 
PROBLEMS (1)
  file:/home/shishqa/dev/tmp/puccini/example.yaml
    @17,17 topology_template.node_templates["server_2"].interfaces["Standard"].operations["create"].inputs["dependency_address"]: call to tosca.function.get_attribute("SELF","dependency",0,"TARGET","public_address") failed because relationship "dependency" attribute "TARGET" not found in "server_2"

[tliron]

I like your thinking! Unfortunately TOSCA 1.3 does not allow for this, as you can only "travel" once using a "modelable entity name" in the first argument. However, for TOSCA 2.0 we are enabling something that is almost identical to what you are doing. We are calling it "TOSCA Path" and it allows for flexible "traveling" in the graph like you are doing here.

If you are a TOSCA member you can download the latest draft here. We would love to get feedback and even better join our team to help define TOSCA 2.0.