CloudFormation Detect Stack Drift

arazzo: 1.0.1
info:
  title: CloudFormation Detect Stack Drift
  summary: Start drift detection, poll until detection completes, then list the drifted resources.
  description: >-
    Drift detection compares a stack's running configuration against its
    expected template configuration. This workflow kicks off a stack-wide drift
    detection, polls DescribeStackDriftDetectionStatus until detection reaches
    DETECTION_COMPLETE (branching to a failure end on DETECTION_FAILED), and then
    retrieves the per-resource drift information so callers can see exactly which
    resources have drifted. Every step spells out its request inline using the
    AWS query protocol so the flow can be read and executed without opening the
    underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: cloudformationApi
  url: ../openapi/cloudformation-api.yml
  type: openapi
workflows:
- workflowId: detect-stack-drift
  summary: Run drift detection on a stack and report which resources drifted.
  description: >-
    Initiates drift detection, waits for the detection operation to complete,
    and returns the drift status plus the list of drifted resources.
  inputs:
    type: object
    required:
    - stackName
    properties:
      stackName:
        type: string
        description: The name or unique ID of the stack to check for drift.
  steps:
  - stepId: startDriftDetection
    description: >-
      Start a stack-wide drift detection operation and capture the detection ID
      used to monitor progress.
    operationId: detectStackDrift
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        StackName: $inputs.stackName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      driftDetectionId: $response.body#/DetectStackDriftResult/StackDriftDetectionId
  - stepId: pollDetectionStatus
    description: >-
      Poll DescribeStackDriftDetectionStatus until detection finishes. Branch to
      listing drifts on DETECTION_COMPLETE or to a failure end on
      DETECTION_FAILED.
    operationId: describeStackDriftDetectionStatus
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        StackDriftDetectionId: $steps.startDriftDetection.outputs.driftDetectionId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      detectionStatus: $response.body#/DescribeStackDriftDetectionStatusResult/DetectionStatus
      stackDriftStatus: $response.body#/DescribeStackDriftDetectionStatusResult/StackDriftStatus
      driftedResourceCount: $response.body#/DescribeStackDriftDetectionStatusResult/DriftedStackResourceCount
    onSuccess:
    - name: detectionComplete
      type: goto
      stepId: listResourceDrifts
      criteria:
      - context: $response.body
        condition: $.DescribeStackDriftDetectionStatusResult.DetectionStatus == "DETECTION_COMPLETE"
        type: jsonpath
    - name: detectionFailed
      type: end
      criteria:
      - context: $response.body
        condition: $.DescribeStackDriftDetectionStatusResult.DetectionStatus == "DETECTION_FAILED"
        type: jsonpath
    - name: stillDetecting
      type: goto
      stepId: pollDetectionStatus
      criteria:
      - context: $response.body
        condition: $.DescribeStackDriftDetectionStatusResult.DetectionStatus == "DETECTION_IN_PROGRESS"
        type: jsonpath
  - stepId: listResourceDrifts
    description: >-
      Retrieve the per-resource drift details for the stack, filtered to the
      resources that have actually drifted.
    operationId: describeStackResourceDrifts
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        StackName: $inputs.stackName
        StackResourceDriftStatusFilters:
        - MODIFIED
        - DELETED
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      resourceDrifts: $response.body#/DescribeStackResourceDriftsResult/StackResourceDrifts
  outputs:
    stackDriftStatus: $steps.pollDetectionStatus.outputs.stackDriftStatus
    driftedResourceCount: $steps.pollDetectionStatus.outputs.driftedResourceCount
    resourceDrifts: $steps.listResourceDrifts.outputs.resourceDrifts