function retryableUpdate()

in common.js [228:266]
37 lines of code
8 McCabe index (conditional complexity)

function retryableUpdate(dynamoDB, updateRequest, callback) {
    var tryNumber = 0;
    var writeRetryLimit = 100;
    var done = false;

    async.whilst(function (test_cb) {
        // retry until the try count is hit
        test_cb(null, tryNumber < writeRetryLimit && done === false);
    }, function (asyncCallback) {
        tryNumber++;

        dynamoDB.updateItem(updateRequest, function (err, data) {
            if (err) {
                if (err.code === 'ResourceInUseException' || err.code === 'ResourceNotFoundException' || err.code === 'ProvisionedThroughputExceededException') {
                    // retry in 1 second if the table is still in the process of
                    // being created
                    logger.warn("Performing retry on DynamoDB UPDATE due to updating Table state");
                    setTimeout(asyncCallback, 1000);
                } else {
                    logger.error(JSON.stringify(updateRequest));
                    logger.error(err);
                    asyncCallback(err);
                }
            } else {
                // all OK - exit OK
                if (data) {
                    done = true;
                    asyncCallback(undefined, data);
                } else {
                    var msg = "Wrote to DynamoDB but didn't receive a verification data element";
                    logger.error(msg);
                    asyncCallback(msg);
                }
            }
        });
    }, function (err, data) {
        callback(err, data);
    });
};