/* Event Parameters
{
  "accessKeyId": "...",
  "secretAccessKey": "...",
  "region": "ap-northeast-1",
  "instanceId": "i-XXXXXXXX"
}
*/
exports.handler = function(event, context) {
  console.log('instanceId =', event.instanceId);

  var AWS = require('aws-sdk');
  AWS.config.update({accessKeyId: event.accessKeyId, secretAccessKey: event.secretAccessKey, region: event.region});
  var ec2 = new AWS.EC2();

  var params = {
    InstanceIds: [event.instanceId],
    DryRun: false
  };

  ec2.startInstances(params, function(err, data) {
    if (err) {
      console.log(err, err.stack);
      context.fail(err);
    } else {
      console.log(data);
      context.succeed(data);
    }
  });
};