check cloudfront invalidation done

check-invalidation-status.js

var i = 0;
var iteration = function () {
    cloudfront.getInvalidation({
        DistributionId: dist,
        Id: invalidationId
    }, function (err, res) {
        if (err) {return callback(err);}

        if (res.Invalidation.Status === "Completed") {
            return callback();
        } else {
            var nextTry = Math.min(60000, 1000 * Math.pow(2, i++));
            log('Invalidation not done yet, next try in ' + nextTry + 'ms.');
            setTimeout(function () {
                iteration();
            }, nextTry);
        }

    });
};
iteration();