Amazon EC2 Stop and Create Image

arazzo: 1.0.1
info:
  title: Amazon EC2 Stop and Create Image
  summary: Stop an instance, wait until stopped, then create an AMI from it.
  description: >-
    Captures a clean AMI from a running instance by first stopping it, polling
    DescribeInstances until the instance reports the stopped state, and then
    creating an image from the now-quiesced instance. The poll step branches on
    the instance state name, looping while stopping and proceeding once stopped.
    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: amazonEc2Api
  url: ../openapi/amazon-ec2-openapi.yml
  type: openapi
workflows:
- workflowId: stop-and-create-image
  summary: Quiesce an instance and snapshot it into a reusable AMI.
  description: >-
    Chains StopInstances, a DescribeInstances poll loop branching on the stopped
    state, and CreateImage to produce an AMI from a cleanly stopped instance.
  inputs:
    type: object
    required:
    - instanceId
    - imageName
    properties:
      instanceId:
        type: string
        description: The ID of the instance to stop and image.
      imageName:
        type: string
        description: A name for the new AMI.
      imageDescription:
        type: string
        description: An optional description for the new AMI.
  steps:
  - stepId: stopInstance
    description: Stop the target instance ahead of imaging.
    operationId: stopInstances
    parameters:
    - name: Action
      in: query
      value: StopInstances
    - name: Version
      in: query
      value: '2016-11-15'
    - name: InstanceId
      in: query
      value: $inputs.instanceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      stopStatus: $statusCode
  - stepId: pollStopped
    description: >-
      Describe the instance and branch on its state, looping while stopping and
      proceeding once it reports stopped.
    operationId: describeInstances
    parameters:
    - name: Action
      in: query
      value: DescribeInstances
    - name: Version
      in: query
      value: '2016-11-15'
    - name: InstanceId
      in: query
      value: $inputs.instanceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      state: $response.body#/reservationSet/0/instancesSet/0/instanceState/name
    onSuccess:
    - name: stillStopping
      type: goto
      stepId: pollStopped
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'stopping'
        type: jsonpath
    - name: nowStopped
      type: goto
      stepId: createImage
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'stopped'
        type: jsonpath
  - stepId: createImage
    description: Create an AMI from the stopped instance.
    operationId: createImage
    parameters:
    - name: Action
      in: query
      value: CreateImage
    - name: Version
      in: query
      value: '2016-11-15'
    - name: InstanceId
      in: query
      value: $inputs.instanceId
    - name: Name
      in: query
      value: $inputs.imageName
    - name: Description
      in: query
      value: $inputs.imageDescription
    - name: NoReboot
      in: query
      value: true
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      imageId: $response.body#/imageId
  outputs:
    imageId: $steps.createImage.outputs.imageId