multi-ec2-create.js

var response = require('cfn-response');
var AWS = require('aws-sdk');
exports.handler = function(event, context) {
  var physicalId = event.PhysicalResourceId || 'none';
  function success(data) {
    return response.send(event, context, response.SUCCESS, data, physicalId);
  }
  function failed(e) {
    return response.send(event, context, response.FAILED, e, physicalId);
  }
  var ec2 = new AWS.EC2();
  var instances;
  if (event.RequestType == 'Create') {
    var launchParams = event.ResourceProperties;
    delete launchParams.ServiceToken;
    ec2.runInstances(launchParams).promise().then((data)=> {
      instances = data.Instances.map((data)=> data.InstanceId);
      physicalId = instances.join(':');
      return ec2.waitFor('instanceRunning', {InstanceIds: instances}).promise();
    }).then((data)=> success({Instances: instances})
    ).catch((e)=> failed(e));
  } else if (event.RequestType == 'Delete') {
    if (physicalId == 'none') {return success({});}
    var deleteParams = {InstanceIds: physicalId.split(':')};
    ec2.terminateInstances(deleteParams).promise().then((data)=>
      ec2.waitFor('instanceTerminated', deleteParams).promise()
    ).then((data)=>success({})
    ).catch((e)=>failed(e));
  } else {
    return failed({Error: "In-place updates not supported."});
  }
  };