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Conditionals

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, Step, Steps, Workflow
from hera.workflows.models import Arguments, Inputs, Parameter

with Workflow(
    arguments=Arguments(
        parameters=[
            Parameter(
                name="should-print",
                value="true",
            )
        ],
    ),
    api_version="argoproj.io/v1alpha1",
    kind="Workflow",
    generate_name="conditional-",
    entrypoint="conditional-example",
) as w:
    with Steps(
        inputs=Inputs(
            parameters=[
                Parameter(
                    name="should-print",
                )
            ],
        ),
        name="conditional-example",
    ) as invocator:
        with invocator.parallel():
            Step(
                name="print-hello-govaluate",
                template="argosay",
                when="{{inputs.parameters.should-print}} == true",
            )
            Step(
                name="print-hello-expr",
                template="argosay",
                when="{{= inputs.parameters[\"should-print\"] == 'true'}}",
            )
            Step(
                name="print-hello-expr-json",
                template="argosay",
                when="{{=jsonpath(workflow.parameters.json, '$[0].value') == 'true'}}",
            )
    Container(
        name="argosay",
        args=["cowsay hello"],
        command=["sh", "-c"],
        image="argoproj/argosay:v1",
    )

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: conditional-
spec:
  entrypoint: conditional-example
  templates:
  - name: conditional-example
    steps:
    - - name: print-hello-govaluate
        template: argosay
        when: '{{inputs.parameters.should-print}} == true'
      - name: print-hello-expr
        template: argosay
        when: '{{= inputs.parameters["should-print"] == ''true''}}'
      - name: print-hello-expr-json
        template: argosay
        when: '{{=jsonpath(workflow.parameters.json, ''$[0].value'') == ''true''}}'
    inputs:
      parameters:
      - name: should-print
  - name: argosay
    container:
      image: argoproj/argosay:v1
      args:
      - cowsay hello
      command:
      - sh
      - -c
  arguments:
    parameters:
    - name: should-print
      value: 'true'

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