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Artifact

This example showcases a simple artifact passing mechanism between two tasks. The first task, writer, creates a file located at /file containing a message. The second task, consumer, takes this artifact, places it at its own /file path, and print out the content.

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


@script(outputs=Artifact(name="test", path="/file"))
def writer():
    with open("/file", "w+") as f:
        f.write("Hello, world!")


@script(inputs=Artifact(name="test", path="/file"))
def consumer():
    with open("/file", "r") as f:
        print(f.readlines())  # prints `Hello, world!` to `stdout`


with Workflow(generate_name="artifact-", entrypoint="d") as w:
    with DAG(name="d"):
        w_ = writer()
        c = consumer(arguments={"test": w_.get_artifact("test")})
        w_ >> c

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: artifact-
spec:
  entrypoint: d
  templates:
  - dag:
      tasks:
      - name: writer
        template: writer
      - arguments:
          parameters:
          - name: test
            value: '{"name": "test", "archive": null, "archive_logs": null, "artifact_gc":
              null, "deleted": null, "from_": "{{tasks.writer.outputs.artifacts.test}}",
              "from_expression": null, "global_name": null, "mode": null, "path":
              "/file", "recurse_mode": null, "sub_path": null}'
        depends: writer
        name: consumer
        template: consumer
    name: d
  - name: writer
    outputs:
      artifacts:
      - name: test
        path: /file
    script:
      command:
      - python
      image: python:3.8
      source: "import os\nimport sys\nsys.path.append(os.getcwd())\nwith open('/file',\
        \ 'w+') as f:\n    f.write('Hello, world!')"
  - inputs:
      artifacts:
      - name: test
        path: /file
    name: consumer
    script:
      command:
      - python
      image: python:3.8
      source: "import os\nimport sys\nsys.path.append(os.getcwd())\nwith open('/file',\
        \ 'r') as f:\n    print(f.readlines())"

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