Amazon EC2 Allocate and Associate Elastic IP

arazzo: 1.0.1
info:
  title: Amazon EC2 Allocate and Associate Elastic IP
  summary: Allocate a VPC Elastic IP, confirm the instance is running, then associate the address.
  description: >-
    Gives a running instance a stable public address by allocating a VPC Elastic
    IP, confirming the target instance is in the running state via
    DescribeInstances, and then associating the allocated address with the
    instance. 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: allocate-and-associate-eip
  summary: Allocate a VPC Elastic IP and bind it to a running instance.
  description: >-
    Chains AllocateAddress, a DescribeInstances running-state confirmation that
    branches on the instance state, and AssociateAddress to attach a stable
    public IP to the instance.
  inputs:
    type: object
    required:
    - allocationId
    - instanceId
    properties:
      allocationId:
        type: string
        description: The allocation ID to associate (supplied or captured from a prior allocate).
      instanceId:
        type: string
        description: The ID of the instance to associate the Elastic IP with.
  steps:
  - stepId: allocateAddress
    description: Allocate an Elastic IP address scoped to a VPC.
    operationId: allocateAddress
    parameters:
    - name: Action
      in: query
      value: AllocateAddress
    - name: Version
      in: query
      value: '2016-11-15'
    - name: Domain
      in: query
      value: vpc
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      allocateStatus: $statusCode
  - stepId: confirmRunning
    description: >-
      Describe the instance and branch on its state, only associating once the
      instance reports running.
    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: notReadyYet
      type: goto
      stepId: confirmRunning
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'pending'
        type: jsonpath
    - name: ready
      type: goto
      stepId: associateAddress
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'running'
        type: jsonpath
  - stepId: associateAddress
    description: Associate the Elastic IP allocation with the running instance.
    operationId: associateAddress
    parameters:
    - name: Action
      in: query
      value: AssociateAddress
    - name: Version
      in: query
      value: '2016-11-15'
    - name: AllocationId
      in: query
      value: $inputs.allocationId
    - name: InstanceId
      in: query
      value: $inputs.instanceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      associateStatus: $statusCode
  outputs:
    associateStatus: $steps.associateAddress.outputs.associateStatus
    instanceState: $steps.confirmRunning.outputs.state