Amazon EC2 Restart and Verify Instance

arazzo: 1.0.1
info:
  title: Amazon EC2 Restart and Verify Instance
  summary: Reboot an instance and poll its status until checks report passed.
  description: >-
    Reboots an instance and waits for it to come back healthy. The workflow
    issues a reboot, confirms the instance reports the running state, and polls
    DescribeInstanceStatus until the call succeeds for the rebooted instance. The
    verification step branches on the running state, looping while the instance
    is still pending its return. 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: instancesApi
  url: ../openapi/amazon-ec2-instances-api-openapi.yml
  type: openapi
workflows:
- workflowId: restart-and-verify-instance
  summary: Reboot an instance and confirm it returns to a running, status-checked state.
  description: >-
    Chains RebootInstances, a DescribeInstances running-state poll that branches
    on the instance state, and DescribeInstanceStatus to confirm the instance is
    back and reporting status.
  inputs:
    type: object
    required:
    - instanceId
    properties:
      instanceId:
        type: string
        description: The ID of the instance to reboot and verify.
  steps:
  - stepId: rebootInstance
    description: Request a reboot of the target instance.
    operationId: rebootInstances
    parameters:
    - name: Action
      in: query
      value: RebootInstances
    - name: Version
      in: query
      value: '2016-11-15'
    - name: InstanceId
      in: query
      value: $inputs.instanceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      rebootStatus: $statusCode
  - stepId: pollRunning
    description: >-
      Describe the instance and branch on its state, looping while pending and
      proceeding once it reports running again.
    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: stillRebooting
      type: goto
      stepId: pollRunning
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'pending'
        type: jsonpath
    - name: backUp
      type: goto
      stepId: verifyStatus
      criteria:
      - context: $response.body
        condition: $.reservationSet[0].instancesSet[0].instanceState.name == 'running'
        type: jsonpath
  - stepId: verifyStatus
    description: Confirm the rebooted instance reports status information.
    operationId: describeInstanceStatus
    parameters:
    - name: Action
      in: query
      value: DescribeInstanceStatus
    - name: Version
      in: query
      value: '2016-11-15'
    - name: InstanceId
      in: query
      value: $inputs.instanceId
    - name: IncludeAllInstances
      in: query
      value: true
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      statusCheck: $statusCode
  outputs:
    finalState: $steps.pollRunning.outputs.state
    statusCheck: $steps.verifyStatus.outputs.statusCheck