Amazon EFS Decommission File System

arazzo: 1.0.1
info:
  title: Amazon EFS Decommission File System
  summary: Confirm a file system has no mount targets, then delete the file system.
  description: >-
    Safely retires an Amazon EFS file system. Because EFS requires that every
    mount target be removed before a file system can be deleted, the workflow
    first describes the file system, then enumerates its mount targets and
    branches: it only proceeds to delete the file system when no mount targets
    remain, otherwise it ends without deleting so a caller can tear the mount
    targets down first. 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: src20150201Api
  url: ../openapi/amazon-efs-2015-02-01-api-openapi.yml
  type: openapi
workflows:
- workflowId: decommission-file-system
  summary: Verify no mount targets remain, then delete the file system.
  description: >-
    Describes the file system, lists its mount targets, and deletes the file
    system only when it has zero mount targets, preventing a delete that EFS
    would reject.
  inputs:
    type: object
    required:
    - fileSystemId
    properties:
      fileSystemId:
        type: string
        description: The ID of the file system to decommission.
  steps:
  - stepId: describeFileSystem
    description: >-
      Describe the file system to confirm it exists and capture its reported
      number of mount targets before attempting deletion.
    operationId: describeFileSystems
    parameters:
    - name: FileSystemId
      in: query
      value: $inputs.fileSystemId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      numberOfMountTargets: $response.body#/FileSystems/0/NumberOfMountTargets
      lifeCycleState: $response.body#/FileSystems/0/LifeCycleState
  - stepId: listMountTargets
    description: >-
      Enumerate the current mount targets for the file system and branch on
      whether any remain attached.
    operationId: describeMountTargets
    parameters:
    - name: FileSystemId
      in: query
      value: $inputs.fileSystemId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      mountTargets: $response.body#/MountTargets
    onSuccess:
    - name: noMountTargets
      type: goto
      stepId: deleteFileSystem
      criteria:
      - context: $response.body
        condition: $.MountTargets.length == 0
        type: jsonpath
    - name: mountTargetsRemain
      type: end
      criteria:
      - context: $response.body
        condition: $.MountTargets.length > 0
        type: jsonpath
  - stepId: deleteFileSystem
    description: >-
      Permanently delete the file system now that no mount targets are
      attached, severing access to its contents.
    operationId: deleteFileSystem
    parameters:
    - name: FileSystemId
      in: path
      value: $inputs.fileSystemId
    successCriteria:
    - condition: $statusCode == 204
    outputs:
      deletedStatusCode: $statusCode
  outputs:
    deletedStatusCode: $steps.deleteFileSystem.outputs.deletedStatusCode