stepfunction-restart.js

var aws = require('aws-sdk');
var sfn = new aws.StepFunctions();

exports.handler = function(event, context, callback) {
  console.log("event:", event)
  console.log("context:", context)
  console.log("callback:", callback)
  let StateMachineArn = event.restart.StateMachineArn;
  event.restart.executionCount -= 1;
  event.AWS_STEP_FUNCTIONS_STARTED_BY_EXECUTION_ID = event.executionID

  let params = {
      input: JSON.stringify(event),
      stateMachineArn: StateMachineArn
  };

  sfn.startExecution(params, function(err, data) {
      if (err) callback(err);
      else callback(null,event);
  });

}