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Reusing Cli App

This example shows how a CLI application built with Cappa can also be used as a script function.

Warning

Using the script decorator is not possible with other CLI libraries like click, and will require use of the Script class and setting source=function_name. See this issue discussion for more details.

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import cappa

from hera.workflows import Workflow, script


@script()
def hello(count: int, name: str):
    """Simple program that greets NAME for a total of COUNT times."""
    for _ in range(count):
        print(f"Hello {name}!")


with Workflow(
    generate_name="cli-example-",
    entrypoint="hello",
    arguments={"count": 3, "name": "Hera"},
) as w:
    hello()


if __name__ == "__main__":
    cappa.invoke(hello)

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: cli-example-
spec:
  entrypoint: hello
  templates:
  - name: hello
    inputs:
      parameters:
      - name: count
      - name: name
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        import json
        try: count = json.loads(r'''{{inputs.parameters.count}}''')
        except: count = r'''{{inputs.parameters.count}}'''
        try: name = json.loads(r'''{{inputs.parameters.name}}''')
        except: name = r'''{{inputs.parameters.name}}'''

        """Simple program that greets NAME for a total of COUNT times."""
        for _ in range(count):
            print(f'Hello {name}!')
      command:
      - python
  arguments:
    parameters:
    - name: count
      value: '3'
    - name: name
      value: Hera

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