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Dag Nested

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

echo = Container(
    name="echo",
    inputs=Parameter(name="message"),
    image="alpine:3.7",
    command=["echo", "{{inputs.parameters.message}}"],
)

with Workflow(generate_name="dag-nested-", entrypoint="diamond") as w:
    with DAG(name="nested-diamond", inputs=[Parameter(name="message")]) as nested_diamond:
        A = echo(name="A", arguments={"message": "{{inputs.parameters.message}}A"})
        B = echo(name="B", arguments={"message": "{{inputs.parameters.message}}B"})
        C = echo(name="C", arguments={"message": "{{inputs.parameters.message}}C"})
        D = echo(name="D", arguments={"message": "{{inputs.parameters.message}}D"})
        A >> [B, C] >> D

    with DAG(name="diamond") as diamond:
        A = nested_diamond(name="A", arguments={"message": "A"})
        B = nested_diamond(name="B", arguments={"message": "B"})
        C = nested_diamond(name="C", arguments={"message": "C"})
        D = nested_diamond(name="D", arguments={"message": "D"})
        A >> [B, C] >> D

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: dag-nested-
spec:
  entrypoint: diamond
  templates:
  - dag:
      tasks:
      - arguments:
          parameters:
          - name: message
            value: '{{inputs.parameters.message}}A'
        name: A
        template: echo
      - arguments:
          parameters:
          - name: message
            value: '{{inputs.parameters.message}}B'
        depends: A
        name: B
        template: echo
      - arguments:
          parameters:
          - name: message
            value: '{{inputs.parameters.message}}C'
        depends: A
        name: C
        template: echo
      - arguments:
          parameters:
          - name: message
            value: '{{inputs.parameters.message}}D'
        depends: B && C
        name: D
        template: echo
    inputs:
      parameters:
      - name: message
    name: nested-diamond
  - container:
      command:
      - echo
      - '{{inputs.parameters.message}}'
      image: alpine:3.7
    inputs:
      parameters:
      - name: message
    name: echo
  - dag:
      tasks:
      - arguments:
          parameters:
          - name: message
            value: A
        name: A
        template: nested-diamond
      - arguments:
          parameters:
          - name: message
            value: B
        depends: A
        name: B
        template: nested-diamond
      - arguments:
          parameters:
          - name: message
            value: C
        depends: A
        name: C
        template: nested-diamond
      - arguments:
          parameters:
          - name: message
            value: D
        depends: B && C
        name: D
        template: nested-diamond
    name: diamond

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