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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, NoneArchiveStrategy, Workflow, script


@script(outputs=Artifact(name="out-art", path="/tmp/file", archive=NoneArchiveStrategy()))
def writer():
    with open("/tmp/file", "w+") as f:
        f.write("Hello, world!")


@script(inputs=Artifact(name="in-art", path="/tmp/file"))
def consumer():
    with open("/tmp/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=w_.get_artifact("out-art").as_name("in-art"))
        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:
          artifacts:
          - from: '{{tasks.writer.outputs.artifacts.out-art}}'
            name: in-art
        depends: writer
        name: consumer
        template: consumer
    name: d
  - name: writer
    outputs:
      artifacts:
      - archive:
          none: {}
        name: out-art
        path: /tmp/file
    script:
      command:
      - python
      image: python:3.8
      source: "import os\nimport sys\nsys.path.append(os.getcwd())\nwith open('/tmp/file',\
        \ 'w+') as f:\n    f.write('Hello, world!')"
  - inputs:
      artifacts:
      - name: in-art
        path: /tmp/file
    name: consumer
    script:
      command:
      - python
      image: python:3.8
      source: "import os\nimport sys\nsys.path.append(os.getcwd())\nwith open('/tmp/file',\
        \ 'r') as f:\n    print(f.readlines())"

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