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Conditional On Task Status

This example showcases conditional execution on success, failure, and error

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from hera.workflows import DAG, Workflow, script


@script()
def random():
    import random

    p = random.random()
    if p <= 0.5:
        raise Exception("failure")


@script()
def success():
    print("succeeded!")


@script()
def failure():
    print("failed!")


with Workflow(generate_name="dag-conditional-on-task-status-", entrypoint="d") as w:
    with DAG(name="d"):
        r = random()

        r.on_success(success())
        r.on_failure(failure())

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: dag-conditional-on-task-status-
spec:
  entrypoint: d
  templates:
  - name: d
    dag:
      tasks:
      - name: random
        template: random
      - name: success
        depends: random.Succeeded
        template: success
      - name: failure
        depends: random.Failed
        template: failure
  - name: random
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        import random
        p = random.random()
        if p <= 0.5:
            raise Exception('failure')
      command:
      - python
  - name: success
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        print('succeeded!')
      command:
      - python
  - name: failure
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        print('failed!')
      command:
      - python

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