exports.handler1 = (event, context, callback) => {
    let database = "xxxxxxx";
    let username = "xxxxxxxxxxx";
    let password = "xxxxxxxxxx";
    let serverAddress="xxxxxx";
    let url = `mongodb://${username}:${password}@${serverAddress}/${database}?connectTimeoutMS=1000`;
    MongoClient.connect(url, (err, db) => {
        if (err) {
            return callback(err, null);
        }
        db.collection("tickets").findOne({}, (err, doc) => {
            if (err) {
                return callback(err, null);
            } else {
                return callback(err, doc["_id"].toString());
            }
            db.close();
        })
    });
};