SQS recursive polling

sqs.js

var aws  = require('aws-sdk');
var util = require('util');

var SQS = new aws.SQS({
    accessKeyId:          'xxxx',
    secretAccessKey:      'xxx',
    region:               'xxx',
    sslEnabled:           false,
    paramValidation:      true,
    convertResponseTypes: true,
    apiVersion:           "2012-11-05"
});

var queueUrl = 'xxxxx';

var formatMsg = function (mem) {

    console.log([mem.rss, mem.heapTotal, mem.heapUsed].join(','));
};

var getMessage = function () {

    formatMsg(process.memoryUsage());

    SQS.receiveMessage({
        QueueUrl:            queueUrl,
        MaxNumberOfMessages: 1,
        VisibilityTimeout:   30,
        WaitTimeSeconds:     20
    }, function (err) {
        if (err) {
            return err;
        }
        // No need for result
        // console.log(res);

        // Recursive call
        getMessage();
    });
};

getMessage();