How to get output results from step function

Question

I have created step functions and invoked them as specified in AWS documentation. For output, I am getting

{ 
"executionArn": "arn:aws:states:us-east-1:123456789012:execution:HelloWorld:MyExecution", "startDate": 1385732956.878 
}

But, instead of above response I want my API response

{ response: DATA}

How can I achieve this?

EDIT: This is the lambda that triggers the state machine:

    import * as AWS from 'aws-sdk';
import {APIGatewayEvent} from 'aws-lambda';

const stepFunctions = new AWS.StepFunctions();

export const handler = (event: APIGatewayEvent) => {
  console.log('event: ' + JSON.stringify(event));
  const stateMachineARN = process.env.MACHINE_ARN;
  const params = {
    stateMachineArn: stateMachineARN,
    input: JSON.stringify(event),
  };
  const request = stepFunctions.startExecution(params);
  request.on('error', err => {
    console.log('aca' + err.message);
  });

  request.send();
};

And the output of the state machine:

{
  "ExecutedVersion": "$LATEST",
  "Payload": {
    "isBase64Encoded": false,
    "statusCode": 200,
    "headers": {},
    "body": {
      "endpoint": {
        "url": "xxx",
        "method": "POST",
        "request": "xxx"
      }
    }
  },

I need to grab that Payload.

Can you provide the state machine configuration, with sensitive data redacted? — Jason Wadsworth
– Jason Wadsworth, Commented Apr 24, 2021 at 5:56
How are you getting that output, via which command/function? Are you using a specific SDK? — Bert Blommers
– Bert Blommers, Commented Apr 24, 2021 at 8:15

Bert Blommers · Accepted Answer · 2021-04-24 08:14:56Z

2

The DescribeExecution function returns the output of a Step Function.

See: https://docs.aws.amazon.com/step-functions/latest/apireference/API_DescribeExecution.html

How to invoke this will depend on your SDK of choice (AWS CLI, Boto3, Java SDK, etc.)

answered Apr 24, 2021 at 8:14

Bert Blommers

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Comments

nirvana124 · Accepted Answer · 2021-04-24 08:39:32Z

1

If you are using express workflow you can invoke it synchronously to get the result of execution.

For standard workflows you need to use DescribeExecution api from sdk or cli for which input is executionArn.

answered Apr 24, 2021 at 8:39

nirvana124

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