arazzo: 1.0.1
info:
  title: Amazon EBS Restore Volume from Snapshot
  summary: Locate a snapshot, create a volume from it, and attach the volume.
  description: >-
    The GetSnapshotBlock direct block API was not present in the spec, so this
    workflow adapts the requested restore-from-snapshot pattern to the
    EC2-style operations the description actually supports. It describes the
    supplied snapshot to confirm it exists, creates a new EBS volume from that
    snapshot in the target Availability Zone, and attaches the restored volume
    to an instance. Every step spells out its request inline so the flow can be
    read and executed without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: amazonEbsApi
  url: ../openapi/amazon-ebs-openapi.yml
  type: openapi
workflows:
- workflowId: restore-volume-from-snapshot
  summary: Create and attach a new EBS volume restored from an existing snapshot.
  description: >-
    Confirms the source snapshot exists, provisions a volume from it in the
    requested Availability Zone, and attaches the restored volume to the
    supplied instance.
  inputs:
    type: object
    required:
    - snapshotId
    - availabilityZone
    - instanceId
    - device
    properties:
      snapshotId:
        type: string
        description: The ID of the snapshot to restore from.
      availabilityZone:
        type: string
        description: The Availability Zone in which to create the volume.
      instanceId:
        type: string
        description: The ID of the instance to attach the restored volume to.
      device:
        type: string
        description: The device name to expose the volume to the instance.
  steps:
  - stepId: findSnapshot
    description: >-
      Describe the supplied snapshot to confirm it exists before restoring from
      it.
    operationId: describeSnapshots
    parameters:
    - name: Action
      in: query
      value: DescribeSnapshots
    - name: Version
      in: query
      value: '2016-11-15'
    - name: SnapshotId
      in: query
      value: $inputs.snapshotId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      statusCode: $statusCode
  - stepId: createVolumeFromSnapshot
    description: >-
      Create a new EBS volume from the confirmed snapshot in the requested
      Availability Zone.
    operationId: createVolume
    parameters:
    - name: Action
      in: query
      value: CreateVolume
    - name: Version
      in: query
      value: '2016-11-15'
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        AvailabilityZone: $inputs.availabilityZone
        SnapshotId: $inputs.snapshotId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      volumeId: $response.body#/volumeId
      state: $response.body#/state
  - stepId: attachRestoredVolume
    description: >-
      Attach the restored volume to the target instance with the requested
      device name.
    operationId: attachVolume
    parameters:
    - name: Action
      in: query
      value: AttachVolume
    - name: Version
      in: query
      value: '2016-11-15'
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        VolumeId: $steps.createVolumeFromSnapshot.outputs.volumeId
        InstanceId: $inputs.instanceId
        Device: $inputs.device
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      statusCode: $statusCode
  outputs:
    restoredVolumeId: $steps.createVolumeFromSnapshot.outputs.volumeId