Allowing extra information to Parameter/Artifact

[sam2x]

Allowing extra information to Parameter/Artifact

[elliotgunton]

Annotated can take multiple metadata values - https://docs.python.org/3/library/typing.html#typing.Annotated

Multiple metadata elements can be supplied (Annotated supports variadic arguments):

@dataclass
class ctype:
    kind: str

Annotated[int, ValueRange(3, 10), ctype("char")]

It is up to the tool consuming the annotations to decide whether the client is allowed to add multiple metadata elements to one annotation and how to merge those annotations.

Hera doesn't explicitly support multiple annotations at the moment (as we just check get_args(annotation)[1]), but it should work as long as Parameter or Artifact is the first piece of metadata according to code such as

hera/src/hera/workflows/_runner/script_annotations_util.py

Lines 154 to 155 in 345e687

	meta_annotation = get_args(annotation)[1]
	if isinstance(meta_annotation, Parameter):

[elliotgunton]

Closing this as the immediate question has been answered - we can add a new issue to explicitly add multiple Annotated elements support if needed