Send Input as Output on error for AWS Step Function

Question

I'd like my state machine to continue execution even in the event of some state error early on. Most of my lambda functions output the same thing they take as input, so I'd like to be able to just pass on the input that the lambda that encountered the error as output to the next state. I tried

{
    "DeleteStuff": {
      "Type": "Task",
      "Resource": "MY_ARN",
      "Catch": [ {
        "ErrorEquals": ["States.ALL"],
        "ResultPath": "$InputPath",
        "Next": "FailedState"
      }],
      "Next": "checkStuff"
    }, ...

without any luck. Has anyone done this, or can anyone offer some assistance?

Thanks!

naesmanak · Accepted Answer · 2018-02-27 21:44:39Z

4

So the solution is the set ResultPath to null. Changing my state machine to

{
    "DeleteStuff": {
      "Type": "Task",
      "Resource": "MY_ARN",
      "Catch": [ {
        "ErrorEquals": ["States.ALL"],
        "ResultPath": null,
        "Next": "FailedState"
      }],
      "Next": "checkStuff"
    }, ...

gave me the desired behaviour.

answered Feb 27, 2018 at 21:44

naesmanak

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Comments

daTobi · Accepted Answer · 2018-05-23 09:30:58Z

2

if you just add a new path to the result path, it is added to the input:

{
    "ErrorEquals": ["States.ALL"],
    "ResultPath": "$.error",
    "Next": "Catch All Error Handler"
}

so if your input was:

{
    "data_a" : "aaa",
    "data_b" : "bbb"
}

output will be:

{
    "data_a" : "aaa",
    "data_b" : "bbb",
    "error" : "<error description>"
}

edited May 23, 2018 at 9:30

answered May 23, 2018 at 9:21

daTobi

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