Amazon EFS Find or Create File System

arazzo: 1.0.1
info:
  title: Amazon EFS Find or Create File System
  summary: Look up a file system by creation token and create it only if it does not already exist.
  description: >-
    An idempotent provisioning pattern for Amazon EFS. The workflow describes
    file systems filtered by a creation token and branches: when a matching file
    system already exists it returns that file system without creating a new one,
    and when none is found it creates a fresh file system with the same creation
    token. This makes repeated runs safe to re-execute. 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: find-or-create-file-system
  summary: Resolve a file system by creation token, creating it only when absent.
  description: >-
    Searches for an existing file system by its creation token and, depending on
    whether one is found, either returns the existing file system or creates a
    new one with the supplied configuration.
  inputs:
    type: object
    required:
    - creationToken
    properties:
      creationToken:
        type: string
        description: The creation token that uniquely identifies the desired file system.
      performanceMode:
        type: string
        description: The performance mode to use when creating the file system (generalPurpose or maxIO).
      throughputMode:
        type: string
        description: The throughput mode to use when creating the file system (bursting, provisioned, or elastic).
      encrypted:
        type: boolean
        description: When true, creates an encrypted file system if one must be created.
  steps:
  - stepId: findFileSystem
    description: >-
      Describe file systems restricted to the supplied creation token and branch
      on whether a match already exists.
    operationId: describeFileSystems
    parameters:
    - name: CreationToken
      in: query
      value: $inputs.creationToken
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      existingFileSystemId: $response.body#/FileSystems/0/FileSystemId
    onSuccess:
    - name: alreadyExists
      type: end
      criteria:
      - context: $response.body
        condition: $.FileSystems.length > 0
        type: jsonpath
    - name: needsCreation
      type: goto
      stepId: createFileSystem
      criteria:
      - context: $response.body
        condition: $.FileSystems.length == 0
        type: jsonpath
  - stepId: createFileSystem
    description: >-
      Create a new file system with the supplied creation token when no existing
      file system matched.
    operationId: createFileSystem
    requestBody:
      contentType: application/json
      payload:
        CreationToken: $inputs.creationToken
        PerformanceMode: $inputs.performanceMode
        ThroughputMode: $inputs.throughputMode
        Encrypted: $inputs.encrypted
    successCriteria:
    - condition: $statusCode == 201
    outputs:
      createdFileSystemId: $response.body#/FileSystemId
      lifeCycleState: $response.body#/LifeCycleState
  outputs:
    existingFileSystemId: $steps.findFileSystem.outputs.existingFileSystemId
    createdFileSystemId: $steps.createFileSystem.outputs.createdFileSystemId