Windmill Run a Script with a Cancel Guard

arazzo: 1.0.1
info:
  title: Windmill Run a Script with a Cancel Guard
  summary: Run a script, inspect the job, and cancel it if it is still queued or running.
  description: >-
    A guarded execution pattern for long-running or stuck jobs. The workflow
    runs a script by path, reads the job record which carries a type
    discriminator of CompletedJob or QueuedJob, and branches: when the job has
    already completed it reads the completed record, and when the job is still
    queued or running it cancels the job with a supplied reason. Every step
    spells out its request inline so the flow can be read and executed without
    opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: windmillApi
  url: ../openapi/windmill-api-openapi.yml
  type: openapi
workflows:
- workflowId: run-script-with-cancel-guard
  summary: Run a script and cancel the job if it has not completed when inspected.
  description: >-
    Starts an asynchronous script run, inspects the job, and either reads the
    completed result or cancels the still-pending job with a reason.
  inputs:
    type: object
    required:
    - token
    - workspace
    - path
    - args
    - cancelReason
    properties:
      token:
        type: string
        description: Windmill API token presented as a Bearer credential.
      workspace:
        type: string
        description: The Windmill workspace id.
      path:
        type: string
        description: The script path to run.
      args:
        type: object
        description: The argument map passed to the script.
      cancelReason:
        type: string
        description: Reason recorded if the job has to be cancelled.
  steps:
  - stepId: runScript
    description: >-
      Submit an asynchronous run of the script by path. The response body is the
      new job UUID.
    operationId: runScriptByPath
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.token"
    - name: workspace
      in: path
      value: $inputs.workspace
    - name: path
      in: path
      value: $inputs.path
    requestBody:
      contentType: application/json
      payload: $inputs.args
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      jobId: $response.body
  - stepId: inspectJob
    description: >-
      Read the job record. The type field discriminates a CompletedJob from a
      still-pending QueuedJob, which drives the cancel-or-read branch.
    operationId: getJob
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.token"
    - name: workspace
      in: path
      value: $inputs.workspace
    - name: id
      in: path
      value: $steps.runScript.outputs.jobId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      jobType: $response.body#/type
    onSuccess:
    - name: alreadyCompleted
      type: goto
      stepId: readCompleted
      criteria:
      - context: $response.body
        condition: $.type == "CompletedJob"
        type: jsonpath
    - name: stillPending
      type: goto
      stepId: cancelJob
      criteria:
      - context: $response.body
        condition: $.type == "QueuedJob"
        type: jsonpath
  - stepId: readCompleted
    description: >-
      Read the completed job record when the run already finished.
    operationId: getCompletedJob
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.token"
    - name: workspace
      in: path
      value: $inputs.workspace
    - name: id
      in: path
      value: $steps.runScript.outputs.jobId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      result: $response.body#/result
      success: $response.body#/success
    onSuccess:
    - name: done
      type: end
  - stepId: cancelJob
    description: >-
      Cancel the still-queued or running job with the supplied reason. The
      response body is a confirmation string.
    operationId: cancelQueuedJob
    parameters:
    - name: Authorization
      in: header
      value: "Bearer $inputs.token"
    - name: workspace
      in: path
      value: $inputs.workspace
    - name: id
      in: path
      value: $steps.runScript.outputs.jobId
    requestBody:
      contentType: application/json
      payload:
        reason: $inputs.cancelReason
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      cancelConfirmation: $response.body
  outputs:
    jobId: $steps.runScript.outputs.jobId
    result: $steps.readCompleted.outputs.result
    cancelConfirmation: $steps.cancelJob.outputs.cancelConfirmation