Amazon Fargate Run the Latest Task Definition

arazzo: 1.0.1
info:
  title: Amazon Fargate Run the Latest Task Definition
  summary: Find the latest active revision of a task definition family, describe it, and run a task from it.
  description: >-
    Launches a task from whatever the newest active revision of a family is. The
    workflow lists the active task definitions for a family, describes the most
    recent revision to confirm it is FARGATE-compatible, and runs a single task
    from it. Each step inlines its AWS JSON 1.1 request and the X-Amz-Target
    action header so the launch can be read and executed directly.
  version: 1.0.0
sourceDescriptions:
- name: fargateApi
  url: ../openapi/amazon-fargate-openapi.yml
  type: openapi
workflows:
- workflowId: run-latest-task-definition
  summary: Resolve the latest active task definition revision for a family and run it.
  description: >-
    Chains listTaskDefinitions, describeTaskDefinition, and runTask so the most
    recent revision is launched without hard-coding a revision number.
  inputs:
    type: object
    required:
    - familyPrefix
    - cluster
    - subnets
    - securityGroups
    properties:
      familyPrefix:
        type: string
        description: Family name prefix to filter task definitions by.
      cluster:
        type: string
        description: Name or ARN of the cluster to run the task in.
      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: listDefinitions
    description: List the active task definition revisions for the family, newest last.
    operationId: listTaskDefinitions
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.ListTaskDefinitions
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        familyPrefix: $inputs.familyPrefix
        status: ACTIVE
        sort: DESC
        maxResults: 1
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      latestArn: $response.body#/taskDefinitionArns/0
    onSuccess:
    - name: found
      type: goto
      stepId: describeLatest
      criteria:
      - context: $response.body
        condition: $.taskDefinitionArns.length > 0
        type: jsonpath
    - name: none
      type: end
      criteria:
      - context: $response.body
        condition: $.taskDefinitionArns.length == 0
        type: jsonpath
  - stepId: describeLatest
    description: Describe the latest revision to confirm it is FARGATE-compatible.
    operationId: describeTaskDefinition
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.DescribeTaskDefinition
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        taskDefinition: $steps.listDefinitions.outputs.latestArn
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      taskDefinitionArn: $response.body#/taskDefinition/taskDefinitionArn
      revision: $response.body#/taskDefinition/revision
      status: $response.body#/taskDefinition/status
  - stepId: runLatest
    description: Run a single Fargate task from the latest revision.
    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: $steps.describeLatest.outputs.taskDefinitionArn
        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
  outputs:
    latestTaskDefinitionArn: $steps.describeLatest.outputs.taskDefinitionArn
    taskArn: $steps.runLatest.outputs.taskArn
    lastStatus: $steps.runLatest.outputs.lastStatus