arazzo: 1.0.1
info:
  title: Amazon EC2 Bind Elastic IP to a New Instance
  summary: Launch an instance, poll until running, allocate an Elastic IP, then associate it.
  description: >-
    Stands up a publicly addressable instance end to end. The workflow launches
    an instance, polls DescribeInstances until it reports running, allocates a
    VPC Elastic IP, and associates the address with the new instance. The poll
    step branches on the instance state name, looping while pending. 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: bind-eip-to-new-instance
  summary: Launch an instance, wait for running, and attach a fresh Elastic IP.
  description: >-
    Chains RunInstances, a DescribeInstances running-state poll branching on the
    instance state, AllocateAddress, and AssociateAddress to deliver a launched
    instance with a stable public IP.
  inputs:
    type: object
    required:
    - imageId
    - instanceType
    - allocationId
    properties:
      imageId:
        type: string
        description: The AMI ID to launch the instance from.
      instanceType:
        type: string
        description: The EC2 instance type to launch.
      allocationId:
        type: string
        description: The allocation ID of the Elastic IP to associate.
  steps:
  - stepId: launchInstance
    description: Launch a single instance from the supplied AMI.
    operationId: runInstances
    parameters:
    - name: Action
      in: query
      value: RunInstances
    - name: Version
      in: query
      value: '2016-11-15'
    - name: ImageId
      in: query
      value: $inputs.imageId
    - name: InstanceType
      in: query
      value: $inputs.instanceType
    - name: MinCount
      in: query
      value: 1
    - name: MaxCount
      in: query
      value: 1
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      instanceId: $response.body#/instances/0/instanceId
  - stepId: pollRunning
    description: >-
      Describe the launched instance and branch on its state, looping while
      pending and proceeding once it reports running.
    operationId: describeInstances
    parameters:
    - name: Action
      in: query
      value: DescribeInstances
    - name: Version
      in: query
      value: '2016-11-15'
    - name: InstanceId
      in: query
      value: $steps.launchInstance.outputs.instanceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      state: $response.body#/reservationSet/0/instancesSet/0/instanceState/name
    onSuccess:
    - name: stillPending
      type: goto
      stepId: pollRunning
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'pending'
        type: jsonpath
    - name: nowRunning
      type: goto
      stepId: allocateAddress
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'running'
        type: jsonpath
  - stepId: allocateAddress
    description: Allocate a VPC Elastic IP address.
    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: 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: $steps.launchInstance.outputs.instanceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      associateStatus: $statusCode
  outputs:
    instanceId: $steps.launchInstance.outputs.instanceId
    associateStatus: $steps.associateAddress.outputs.associateStatus