Expression

TOSCA provides for a set of functions to reference elements within the template or to retrieve runtime values.

Below is a list of supported expressions

get_input

The get_input function is used to retrieve the values of properties declared within the inputs section of a TOSCA Service Template.

Within CDS, this is mainly Workflow inputs.

Example:

"resolution-key": {
   "get_input": "resolution-key"
}

get_property

The get_property function is used to retrieve property values between modelable entities defined in the same service template.

Example:

"get_property": ["SELF", "property-name"]

get_attribute

The get_attribute function is used to retrieve the values of named attributes declared by the referenced node or relationship template name.

Example:

"get_attribute": [
   "resource-assignment",
   "assignment-params"
]

get_operation_output

The get_operation_output function is used to retrieve the values of variables exposed / exported from an interface operation.

Example:

"get_operation_output": ["SELF", "interface-name", "operation-name", "output-property-name"]

get_artifact

The get_artifact function is used to retrieve artifact location between modelable entities defined in the same service template.

Example:

"get_artifact" : ["SELF", "artifact-template", "location", true]