Amazon Fargate Run a Batch Task to Completion

arazzo: 1.0.1
info:
  title: Amazon Fargate Run a Batch Task to Completion
  summary: Run a one-off Fargate task and poll DescribeTasks until it reaches STOPPED.
  description: >-
    Runs a short-lived batch job on Fargate and waits for it to finish. The
    workflow runs a single task from an existing task definition and then polls
    DescribeTasks until the task's lastStatus becomes STOPPED, capturing the
    stopped reason. This is the standard pattern for fire-and-wait batch jobs
    where you need the exit state. Each step inlines its AWS JSON 1.1 request and
    the X-Amz-Target action header so the job can be read and executed directly.
  version: 1.0.0
sourceDescriptions:
- name: tasksApi
  url: ../openapi/amazon-fargate-tasks-api-openapi.yml
  type: openapi
workflows:
- workflowId: run-batch-task-to-completion
  summary: Run a single Fargate task from an existing definition and wait until it stops.
  description: >-
    Chains runTask and a describeTasks poll loop that ends when the task reaches
    a STOPPED terminal state.
  inputs:
    type: object
    required:
    - cluster
    - taskDefinition
    - subnets
    - securityGroups
    properties:
      cluster:
        type: string
        description: Name or ARN of the cluster to run the task in.
      taskDefinition:
        type: string
        description: Family:revision or ARN of the task definition to run.
      subnets:
        type: array
        items:
          type: string
        description: Subnet IDs for the awsvpc network configuration.
      securityGroups:
        type: array
        items:
          type: string
        description: Security group IDs for the awsvpc network configuration.
      assignPublicIp:
        type: string
        description: Whether to assign a public IP (ENABLED or DISABLED).
        default: ENABLED
  steps:
  - stepId: runTask
    description: Run a single Fargate task from the supplied task definition.
    operationId: runTask
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.RunTask
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        cluster: $inputs.cluster
        taskDefinition: $inputs.taskDefinition
        launchType: FARGATE
        count: 1
        networkConfiguration:
          awsvpcConfiguration:
            subnets: $inputs.subnets
            securityGroups: $inputs.securityGroups
            assignPublicIp: $inputs.assignPublicIp
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      taskArn: $response.body#/tasks/0/taskArn
      lastStatus: $response.body#/tasks/0/lastStatus
  - stepId: pollUntilStopped
    description: >-
      Poll DescribeTasks until the task reaches STOPPED, re-entering this step
      while the task is still provisioning, pending, or running.
    operationId: describeTasks
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.DescribeTasks
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        cluster: $inputs.cluster
        tasks:
        - $steps.runTask.outputs.taskArn
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      lastStatus: $response.body#/tasks/0/lastStatus
      stoppedReason: $response.body#/tasks/0/stoppedReason
    onSuccess:
    - name: stillRunning
      type: goto
      stepId: pollUntilStopped
      criteria:
      - context: $response.body
        condition: $.tasks[0].lastStatus != 'STOPPED'
        type: jsonpath
    - name: completed
      type: end
      criteria:
      - context: $response.body
        condition: $.tasks[0].lastStatus == 'STOPPED'
        type: jsonpath
  outputs:
    taskArn: $steps.runTask.outputs.taskArn
    finalStatus: $steps.pollUntilStopped.outputs.lastStatus
    stoppedReason: $steps.pollUntilStopped.outputs.stoppedReason