Expression Tag Template Workflow

Note

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

HeraYAML

from hera.workflows import DAG, Container, Task, Workflow
from hera.workflows.models import Arguments, Inputs, Outputs, Parameter, ValueFrom

with Workflow(
    api_version="argoproj.io/v1alpha1",
    kind="Workflow",
    annotations={"workflows.argoproj.io/version": ">= 3.1.0"},
    generate_name="expression-tag-template-",
    labels={"workflows.argoproj.io/test": "true"},
    entrypoint="main",
) as w:
    with DAG(
        name="main",
    ) as invocator:
        Task(
            with_param="{{=toJson(filter([1, 3], {# > 1}))}}",
            arguments=Arguments(
                parameters=[
                    Parameter(
                        name="foo",
                        value="{{=item}}",
                    )
                ],
            ),
            name="task-0",
            template="pod-0",
        )
    Container(
        inputs=Inputs(
            parameters=[
                Parameter(
                    name="foo",
                )
            ],
        ),
        name="pod-0",
        outputs=Outputs(
            parameters=[
                Parameter(
                    name="output",
                    value_from=ValueFrom(
                        path="/output",
                    ),
                )
            ],
        ),
        args=[
            "echo",
            "hello {{=asInt(inputs.parameters.foo) * 10}} @ {{=sprig.date('2006', workflow.creationTimestamp)}}\n",
            "/output",
        ],
        image="argoproj/argosay:v2",
    )

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: expression-tag-template-
  annotations:
    workflows.argoproj.io/version: '>= 3.1.0'
  labels:
    workflows.argoproj.io/test: 'true'
spec:
  entrypoint: main
  templates:
  - name: main
    dag:
      tasks:
      - name: task-0
        template: pod-0
        withParam: '{{=toJson(filter([1, 3], {# > 1}))}}'
        arguments:
          parameters:
          - name: foo
            value: '{{=item}}'
  - name: pod-0
    container:
      image: argoproj/argosay:v2
      args:
      - echo
      - |
        hello {{=asInt(inputs.parameters.foo) * 10}} @ {{=sprig.date('2006', workflow.creationTimestamp)}}
      - /output
    inputs:
      parameters:
      - name: foo
    outputs:
      parameters:
      - name: output
        valueFrom:
          path: /output

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