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Dag Coinflip

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, Script, Step, Steps, Task, Workflow

with Workflow(
    api_version="argoproj.io/v1alpha1",
    kind="Workflow",
    annotations={"workflows.argoproj.io/description": "This is an example of coin flip defined as a DAG.\n"},
    generate_name="dag-diamond-coinflip-",
    entrypoint="diamond",
) as w:
    with DAG(
        name="diamond",
    ) as invocator:
        Task(
            name="A",
            template="coinflip",
        )
        Task(
            name="B",
            template="coinflip",
            depends="A",
        )
        Task(
            name="C",
            template="coinflip",
            depends="A",
        )
        Task(
            name="D",
            template="coinflip",
            depends="B && C",
        )
    with Steps(
        name="coinflip",
    ) as invocator:
        Step(
            name="flip-coin",
            template="flip-coin",
        )
        with invocator.parallel():
            Step(
                name="heads",
                template="heads",
                when="{{steps.flip-coin.outputs.result}} == heads",
            )
            Step(
                name="tails",
                template="coinflip",
                when="{{steps.flip-coin.outputs.result}} == tails",
            )
    Script(
        name="flip-coin",
        command=["python"],
        image="python:alpine3.6",
        source='import random\nresult = "heads" if random.randint(0,1) == 0 else "tails"\nprint(result)\n',
    )
    Container(
        name="heads",
        args=['echo "it was heads"'],
        command=["sh", "-c"],
        image="alpine:3.6",
    )

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: dag-diamond-coinflip-
  annotations:
    workflows.argoproj.io/description: |
      This is an example of coin flip defined as a DAG.
spec:
  entrypoint: diamond
  templates:
  - name: diamond
    dag:
      tasks:
      - name: A
        template: coinflip
      - name: B
        depends: A
        template: coinflip
      - name: C
        depends: A
        template: coinflip
      - name: D
        depends: B && C
        template: coinflip
  - name: coinflip
    steps:
    - - name: flip-coin
        template: flip-coin
    - - name: heads
        template: heads
        when: '{{steps.flip-coin.outputs.result}} == heads'
      - name: tails
        template: coinflip
        when: '{{steps.flip-coin.outputs.result}} == tails'
  - name: flip-coin
    script:
      image: python:alpine3.6
      source: |
        import random
        result = "heads" if random.randint(0,1) == 0 else "tails"
        print(result)
      command:
      - python
  - name: heads
    container:
      image: alpine:3.6
      args:
      - echo "it was heads"
      command:
      - sh
      - -c

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