Amazon EC2 Inventory Instances Then Image First

arazzo: 1.0.1
info:
  title: Amazon EC2 Inventory Instances Then Image First
  summary: Describe instances, page through with NextToken, then image the first instance found.
  description: >-
    Builds an instance inventory and captures an image of the first instance it
    finds. The workflow describes instances, follows the NextToken pagination
    cursor by looping while a token is present, and once paging is complete
    creates an AMI from the first discovered instance. The pagination step
    branches on whether a NextToken remains. Every step spells out its request
    inline using the Amazon EC2 query protocol (Action and Version parameters) so
    the flow can be read and executed without opening the underlying OpenAPI
    description.
  version: 1.0.0
sourceDescriptions:
- name: amisApi
  url: ../openapi/amazon-ec2-amis-api-openapi.yml
  type: openapi
- name: instancesApi
  url: ../openapi/amazon-ec2-instances-api-openapi.yml
  type: openapi
workflows:
- workflowId: paginate-instances-then-image
  summary: Page through described instances and image the first one found.
  description: >-
    Chains a DescribeInstances pagination loop branching on the NextToken cursor
    with a CreateImage call against the first discovered instance.
  inputs:
    type: object
    required:
    - imageName
    properties:
      imageName:
        type: string
        description: A name for the AMI captured from the first discovered instance.
      maxResults:
        type: integer
        description: The maximum number of instances to return per page.
        default: 100
  steps:
  - stepId: pageInstances
    description: >-
      Describe instances and branch on the NextToken cursor, looping while more
      pages remain and proceeding once the listing is complete.
    operationId: describeInstances
    parameters:
    - name: Action
      in: query
      value: DescribeInstances
    - name: Version
      in: query
      value: '2016-11-15'
    - name: MaxResults
      in: query
      value: $inputs.maxResults
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      nextToken: $response.body#/nextToken
      firstInstanceId: $response.body#/reservationSet/0/instancesSet/0/instanceId
    onSuccess:
    - name: morePages
      type: goto
      stepId: pageInstances
      criteria:
      - context: $response.body
        condition: $.nextToken != null && $.nextToken != ''
        type: jsonpath
    - name: lastPage
      type: goto
      stepId: imageFirst
      criteria:
      - context: $response.body
        condition: $.nextToken == null || $.nextToken == ''
        type: jsonpath
  - stepId: imageFirst
    description: Create an AMI from the first instance discovered during paging.
    operationId: createImage
    parameters:
    - name: Action
      in: query
      value: CreateImage
    - name: Version
      in: query
      value: '2016-11-15'
    - name: InstanceId
      in: query
      value: $steps.pageInstances.outputs.firstInstanceId
    - name: Name
      in: query
      value: $inputs.imageName
    - name: NoReboot
      in: query
      value: true
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      imageId: $response.body#/imageId
  outputs:
    imageId: $steps.imageFirst.outputs.imageId