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Artifacts In Dags

This example shows how to use artifacts as inputs and outputs of DAGs.

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from hera.workflows import DAG, Artifact, Container, Workflow

with Workflow(
    generate_name="artifacts-in-dags-",
    entrypoint="runner-dag",
) as w:
    hello_world_to_file = Container(
        name="hello-world-to-file",
        image="busybox",
        command=["sh", "-c"],
        args=["sleep 1; echo hello world | tee /tmp/hello_world.txt"],
        outputs=[Artifact(name="hello-art", path="/tmp/hello_world.txt")],
    )
    print_message_from_file = Container(
        name="print-message-from-file",
        image="alpine:latest",
        command=["sh", "-c"],
        args=["cat /tmp/message"],
        inputs=[Artifact(name="message", path="/tmp/message")],
    )

    # First DAG generates an artifact from a task, and "lifts" it out as an output of the DAG template itself
    with DAG(
        name="generate-artifact-dag",
        outputs=[Artifact(name="hello-file", from_="{{tasks.hello-world-to-file.outputs.artifacts.hello-art}}")],
    ) as d1:
        hello_world_to_file()

    # Second DAG takes an artifact input, and the task references it using `get_artifact`
    with DAG(name="consume-artifact-dag", inputs=[Artifact(name="hello-file-input")]) as d2:
        print_message_from_file(
            arguments=d2.get_artifact("hello-file-input").with_name("message"),
        )

    # Third DAG orchestrates the first two, by creating tasks by "calling" the objects
    with DAG(name="runner-dag"):
        generator_dag = d1()
        consumer_dag = d2(arguments=generator_dag.get_artifact("hello-file").with_name("hello-file-input"))

        generator_dag >> consumer_dag

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: artifacts-in-dags-
spec:
  entrypoint: runner-dag
  templates:
  - name: hello-world-to-file
    container:
      image: busybox
      args:
      - sleep 1; echo hello world | tee /tmp/hello_world.txt
      command:
      - sh
      - -c
    outputs:
      artifacts:
      - name: hello-art
        path: /tmp/hello_world.txt
  - name: print-message-from-file
    container:
      image: alpine:latest
      args:
      - cat /tmp/message
      command:
      - sh
      - -c
    inputs:
      artifacts:
      - name: message
        path: /tmp/message
  - name: generate-artifact-dag
    dag:
      tasks:
      - name: hello-world-to-file
        template: hello-world-to-file
    outputs:
      artifacts:
      - name: hello-file
        from: '{{tasks.hello-world-to-file.outputs.artifacts.hello-art}}'
  - name: consume-artifact-dag
    dag:
      tasks:
      - name: print-message-from-file
        template: print-message-from-file
        arguments:
          artifacts:
          - name: message
            from: '{{inputs.artifacts.hello-file-input}}'
    inputs:
      artifacts:
      - name: hello-file-input
  - name: runner-dag
    dag:
      tasks:
      - name: generate-artifact-dag
        template: generate-artifact-dag
      - name: consume-artifact-dag
        depends: generate-artifact-dag
        template: consume-artifact-dag
        arguments:
          artifacts:
          - name: hello-file-input
            from: '{{tasks.generate-artifact-dag.outputs.artifacts.hello-file}}'

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