No way to catch and retry errors from Step Functions tasks?

alex · November 2, 2024, 4:18am

When a lambda throws an error to indicate failure, it looks like the Step Functions task always assigns the error code “Exception” to it regardless of the exception type. I think this makes it impossible to route custom errors through the Retry and Catch handlers. Is there any way around this?

This seems to be confirmed here:

github.com

localstack/localstack/blob/ceaab7338281f876e6a3f76d74d480ac0232f8cd/localstack-core/localstack/services/stepfunctions/asl/component/state/state_execution/state_task/state_task_lambda.py#L62


      
                  event_type=HistoryEventType.LambdaFunctionTimedOut,
                  event_details=EventDetails(
                      lambdaFunctionTimedOutEventDetails=LambdaFunctionTimedOutEventDetails(
                          error=StatesErrorNameType.StatesTimeout.to_name(),
                      )
                  ),
              )
          if isinstance(ex, FailureEventException):
              return ex.failure_event
          
          error = "Exception"
          if isinstance(ex, lambda_eval_utils.LambdaFunctionErrorException):
              error_name = CustomErrorName(error)
              cause = ex.payload
          elif isinstance(ex, ClientError):
              error_name = CustomErrorName(error)
              cause = ex.response["Error"]["Message"]
          else:
              error_name = StatesErrorName(StatesErrorNameType.StatesTaskFailed)
              cause = str(ex)

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No way to catch and retry errors from Step Functions tasks?

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