Example AWS Step Function Iterator Pattern

step-function-iterator.yml

CreateSnapshot:
  Type: Task
  Resource: ${self:custom.function-arn}-CreateSnapshot
  Next: CreateSnapshotIterator
  Retry: ${file(common.yml):reqLimitRetry}
CreateSnapshotIterator:
  Type: Task
  Resource: ${self:custom.function-arn}-Iterate
  InputPath: '$.snapshotCreateIterator'
  ResultPath: '$.snapshotCreateIterator'
  Next: IsCreateSnapshotIterationComplete
  Retry: ${file(common.yml):reqLimitRetry}
IsCreateSnapshotIterationComplete:
  Type: Choice
  Choices:
    - Variable: '$.snapshotCreateIterator.continue'
      BooleanEquals: true
      Next: CreateSnapshot
  Default: WaitForSnapshotsCreate
WaitForSnapshotsCreate:
  Type: Wait
  Seconds: 60
  Next: CheckSnapshotsCreateStatus
CheckSnapshotsCreateStatus:
  Type: Task
  Resource: ${self:custom.function-arn}-CheckSnapshotsCreateStatus
  Next: EvaluateSnapshotsCreateStatus
  ResultPath: '$.snapshotStatus'
  Retry: ${file(common.yml):reqLimitRetry}
EvaluateSnapshotsCreateStatus:
  Type: Choice
  Choices:
    - Variable: '$.snapshotStatus'
      StringEquals: ${self:custom.status.failed}
      Next: StopInstancesFailure
    - Variable: '$.snapshotStatus'
      StringEquals: ${self:custom.status.success}
      Next: DeleteVolume
  Default: WaitForSnapshotsCreate