Step Function error handling

I have a state that updates DynamoDB by shifting the first word off a list of words. It returns UPDATED_OLD so that the word can be grabbed in the ResultSelector block as index 0 and passed on to the next step. If there are words in the list this works fine, but if the list is empty, there is nothing at index 0 and Step Functions throws a States.Runtime error and the execution fails. I added a Catch block but it isn't catching as expected. Can this error be caught? Thank you.

주제

서버리스 애플리케이션 통합 데이터베이스

태그

AWS 단계 함수 아마존 DynamoDB

언어

English

jamessouth

질문됨 2년 전633회 조회

1개 답변

최신
최다 투표
가장 많은 댓글

이 답변이 도움이 되었나요?커뮤니티가 여러분의 지식을 활용할 수 있도록 정답을 찬성하세요.

Use a Choice state to check for existence of array[0]. Something like this:

{
  "StartAt": "CheckArrayEmpty",
  "States": {
    "CheckArrayEmpty": {
      "Type": "Choice",
      "Choices": [
        {
          "Variable": "$.array[0]",
          "IsPresent": true,
          "Next": "NotEmpty"
        }
      ],
      "Default": "Empty"
    },
    "NotEmpty": {
      "Type": "Pass",
      "End": true
    },
    "Empty": {
      "Type": "Pass",
      "End": true
    }
  }
}

전문가

Uri

답변함 2년 전

jamessouth
2년 전
Thank you for replying Uri. I came up with a work-around outside of this step function but I would still like to know about catching the error. Is this a bug in the service?

Step Function error handling

관련 콘텐츠