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Loops Dag

Note

This example is a replication of an Argo Workflow example in Hera. The upstream example can be found here.

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from hera.workflows import DAG, Container, Parameter, Workflow

with Workflow(
    generate_name="loops-dag-",
    entrypoint="loops-dag",
) as w:
    echo = Container(
        name="print-message",
        image="busybox",
        command=["echo"],
        args=["{{inputs.parameters.message}}"],
        inputs=[Parameter(name="message")],
    )
    with DAG(name="loops-dag"):
        A = echo(name="A", arguments={"message": "A"})
        B = echo(name="B", arguments={"message": "{{item}}"}, with_items=["foo", "bar", "baz"])
        C = echo(name="C", arguments={"message": "C"})
        A >> B >> C

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: loops-dag-
spec:
  entrypoint: loops-dag
  templates:
  - name: print-message
    container:
      image: busybox
      args:
      - '{{inputs.parameters.message}}'
      command:
      - echo
    inputs:
      parameters:
      - name: message
  - name: loops-dag
    dag:
      tasks:
      - name: A
        template: print-message
        arguments:
          parameters:
          - name: message
            value: A
      - name: B
        depends: A
        template: print-message
        withItems:
        - foo
        - bar
        - baz
        arguments:
          parameters:
          - name: message
            value: '{{item}}'
      - name: C
        depends: B
        template: print-message
        arguments:
          parameters:
          - name: message
            value: C

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