AWS node.js recursion for 503 SlowDown handling

slow-down-ya-bishhhhh.js

/**
 * An improvement to this would be linear or eponential increase of wait ms
 * with a threshold to give up...
 *
 */
async function getTaggings(bucket, key, wait) {
    let params = {
        Bucket: bucket,
        Key: key
    };

    if (wait)
        await sleep(1000);

    return new Promise((resolve, reject) => {
        s3.getObjectTagging(params, function(err, data) {
            if (err) {
                if (err.code == "SlowDown")
                    return getTaggings(bucket, key, true);

                return reject(err);
            }

            if (!data.TagSet)
                return resolve({});

            let TagSet = data.TagSet;
            resolve(TagSet.reduce((acc, e) => {
                acc[e.Key] = e.Value;
                return acc;
            }, {}))
        });
    });
}

async function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}