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Conditionals Complex

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 Container, Script, Step, Steps, Workflow

with Workflow(
    api_version="argoproj.io/v1alpha1",
    kind="Workflow",
    generate_name="coinflip-",
    entrypoint="coinflip",
) as w:
    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="tails",
                when="{{steps.flip-coin.outputs.result}} == tails",
            )
        Step(
            name="flip-again",
            template="flip-coin",
        )
        with invocator.parallel():
            Step(
                name="complex-condition",
                template="heads-tails-or-twice-tails",
                when="( {{steps.flip-coin.outputs.result}} == heads &&\n  {{steps.flip-again.outputs.result}} == tails\n) || ( {{steps.flip-coin.outputs.result}} == tails &&\n  {{steps.flip-again.outputs.result}} == tails )",
            )
            Step(
                name="heads-regex",
                template="heads",
                when="{{steps.flip-again.outputs.result}} =~ hea",
            )
            Step(
                name="tails-regex",
                template="tails",
                when="{{steps.flip-again.outputs.result}} =~ tai",
            )
    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",
    )
    Container(
        name="tails",
        args=['echo "it was tails"'],
        command=["sh", "-c"],
        image="alpine:3.6",
    )
    Container(
        name="heads-tails-or-twice-tails",
        args=['echo "it was heads the first flip and tails the second. Or it was two times tails."'],
        command=["sh", "-c"],
        image="alpine:3.6",
    )

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: coinflip-
spec:
  entrypoint: coinflip
  templates:
  - name: coinflip
    steps:
    - - name: flip-coin
        template: flip-coin
    - - name: heads
        template: heads
        when: '{{steps.flip-coin.outputs.result}} == heads'
      - name: tails
        template: tails
        when: '{{steps.flip-coin.outputs.result}} == tails'
    - - name: flip-again
        template: flip-coin
    - - name: complex-condition
        template: heads-tails-or-twice-tails
        when: |-
          ( {{steps.flip-coin.outputs.result}} == heads &&
            {{steps.flip-again.outputs.result}} == tails
          ) || ( {{steps.flip-coin.outputs.result}} == tails &&
            {{steps.flip-again.outputs.result}} == tails )
      - name: heads-regex
        template: heads
        when: '{{steps.flip-again.outputs.result}} =~ hea'
      - name: tails-regex
        template: tails
        when: '{{steps.flip-again.outputs.result}} =~ tai'
  - 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
  - name: tails
    container:
      image: alpine:3.6
      args:
      - echo "it was tails"
      command:
      - sh
      - -c
  - name: heads-tails-or-twice-tails
    container:
      image: alpine:3.6
      args:
      - echo "it was heads the first flip and tails the second. Or it was two times
        tails."
      command:
      - sh
      - -c

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