Amazon EC2 Request Spot Instances and Track

arazzo: 1.0.1
info:
  title: Amazon EC2 Request Spot Instances and Track
  summary: Request Spot Instances, then poll the Spot request until it is fulfilled.
  description: >-
    Requests Spot capacity and tracks the request to fulfillment. The workflow
    submits a Spot Instance request and polls DescribeSpotInstanceRequests until
    the call reports the request, looping until the request set is non-empty.
    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: spotInstancesApi
  url: ../openapi/amazon-ec2-spot-instances-api-openapi.yml
  type: openapi
workflows:
- workflowId: request-spot-and-track
  summary: Submit a Spot Instance request and poll until it appears.
  description: >-
    Chains RequestSpotInstances with a DescribeSpotInstanceRequests poll loop
    that branches on whether the request set has appeared yet.
  inputs:
    type: object
    required:
    - spotPrice
    - instanceCount
    properties:
      spotPrice:
        type: string
        description: The maximum price per unit hour for a Spot Instance.
      instanceCount:
        type: integer
        description: The number of Spot Instances to request.
      requestType:
        type: string
        description: The Spot request type (one-time or persistent).
        default: one-time
  steps:
  - stepId: requestSpot
    description: Submit the Spot Instance request.
    operationId: requestSpotInstances
    parameters:
    - name: Action
      in: query
      value: RequestSpotInstances
    - name: Version
      in: query
      value: '2016-11-15'
    - name: SpotPrice
      in: query
      value: $inputs.spotPrice
    - name: InstanceCount
      in: query
      value: $inputs.instanceCount
    - name: Type
      in: query
      value: $inputs.requestType
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      requestStatus: $statusCode
  - stepId: trackSpot
    description: >-
      Describe Spot Instance requests and branch on whether the request set has
      appeared, looping until it is non-empty.
    operationId: describeSpotInstanceRequests
    parameters:
    - name: Action
      in: query
      value: DescribeSpotInstanceRequests
    - name: Version
      in: query
      value: '2016-11-15'
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      trackStatus: $statusCode
  outputs:
    requestStatus: $steps.requestSpot.outputs.requestStatus
    trackStatus: $steps.trackSpot.outputs.trackStatus