aws step functions pass data from lambda to lambda

Question

I've been researching on how to pass data from a Lambda to another Lambda in a Step Function and this is what i got. I have this dummy lambda that pass the data name:

exports.lambdaHandler = async (event, context, callback) => {
    const name = 'test';
    callback(null, { name });
}

to another lambda, where i try to get the data in this way, but is not working:

const name = event.name; //this returns undefined

Based on this tutorial, this should be enough but it doesn't work. Can you point me in what direction should i go? Do i have to use the InputPath, ResultPath properties of the states machines?

[Update] This is the State machine definition:

{
  "Comment": "commen test",
  "StartAt": "FunctionOne",
  "States": {
    "FunctionOne": {
      "Type": "Task",
      "Resource": "arn:aws:states:::lambda:invoke",
      "Parameters": {
        "FunctionName": <arn FunctionOne>
      },
      "Next": "FunctionTwo"
    },
    "FunctionTwo": {
      "Type": "Task",
      "Resource": "arn:aws:states:::lambda:invoke",
      "Parameters": {
        "FunctionName": <arn FunctionTwo>
      },
      "End": true
    }
  }
}

Can you post your fsm definition?

jellycsc
– jellycsc

2020-07-27 20:59:26 +00:00
Commented Jul 27, 2020 at 20:59 — jellycsc
– jellycsc, Commented Jul 27, 2020 at 20:59
@jellycsc updated

ffchih
– ffchih

2020-07-27 21:04:24 +00:00
Commented Jul 27, 2020 at 21:04 — ffchih
– ffchih, Commented Jul 27, 2020 at 21:04

jellycsc · Accepted Answer · 2020-07-27 21:22:10Z

1

Try this

{
  "Comment": "commen test",
  "StartAt": "FunctionOne",
  "States": {
    "FunctionOne": {
      "Type": "Task",
      "Resource": "<arn FunctionOne>",
      "Next": "FunctionTwo"
    },
    "FunctionTwo": {
      "Type": "Task",
      "Resource": "<arn FunctionTwo>",
      "End": true
    }
  }
}

answered Jul 27, 2020 at 21:22

jellycsc

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2 Comments

ffchih Over a year ago

It worked, thank you! Do you have an explanation for the change you propose? When creating the states I used the "generate snippets" option, and print out the states with that format

jellycsc Over a year ago

You don't need a service integration to call a lambda. Please read this documentation.

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