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Callable Coinflip

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import random

from hera.shared import global_config
from hera.workflows import DAG, Script, Workflow, script

# Note, setting constructor to runner is only possible if the source code is available
# along with dependencies include hera in the image.
# Callable is a robust mode that allows you to run any python function
# and is compatible with pydantic. It automatically parses the input
# and serializes the output.
global_config.image = "my-image-with-python-source-code-and-dependencies"
global_config.set_class_defaults(Script, constructor="runner")


@script()
def flip():
    return "heads" if random.randint(0, 1) == 0 else "tails"


@script()
def heads():
    return "it was heads"


@script()
def tails():
    return "it was tails"


with Workflow(generate_name="coinflip-", entrypoint="d") as w:
    with DAG(name="d") as s:
        f = flip()
        heads().on_other_result(f, "heads")
        tails().on_other_result(f, "tails")

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: coinflip-
spec:
  entrypoint: d
  templates:
  - dag:
      tasks:
      - name: flip
        template: flip
      - depends: flip
        name: heads
        template: heads
        when: '{{tasks.flip.outputs.result}} == heads'
      - depends: flip
        name: tails
        template: tails
        when: '{{tasks.flip.outputs.result}} == tails'
    name: d
  - name: flip
    script:
      args:
      - -m
      - hera.workflows.runner
      - -e
      - examples.workflows.callable_coinflip:flip
      command:
      - python
      image: my-image-with-python-source-code-and-dependencies
      source: '{{inputs.parameters}}'
  - name: heads
    script:
      args:
      - -m
      - hera.workflows.runner
      - -e
      - examples.workflows.callable_coinflip:heads
      command:
      - python
      image: my-image-with-python-source-code-and-dependencies
      source: '{{inputs.parameters}}'
  - name: tails
    script:
      args:
      - -m
      - hera.workflows.runner
      - -e
      - examples.workflows.callable_coinflip:tails
      command:
      - python
      image: my-image-with-python-source-code-and-dependencies
      source: '{{inputs.parameters}}'

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