如何检查用户名是否不存在然后插入用户名值并继续函数findOneAndUpdate

Question

我有这个函数来findOneAndUpdate，它会查找是否存在用户名然后设置时间字段并增加其他字段的数量。

function _lockIfFailedAttemptsReachLimit(username,next) {
    colUser.findOneAndUpdate({ username }, { // increase failed attempt counter
        $set: { failedLoginAt: new Date() },
        $inc: { nFailedLogin: 1 },
    }, { upsert: false, returnOriginal: false }, (err, result) => {
        if (err) { // Undefined.
            next('Undefined error!');
        } else {
            let foundUser = result.value;
            if (_.isNil(foundUser)) { // cannot find username
                //nothing here yet.
            }

            let nFailed = _.get(foundUser, 'nFailedLogin', 0);

            let errMsg = `Invalid username or passsword. You have tried ${nFailed}/${MAX_FAILED_LOGIN_ATTEMPTS} login attempts`;

            if (nFailed < MAX_FAILED_LOGIN_ATTEMPTS) {
                next(errMsg);
            } else {
                _lockAccount(username, (err, result) => {
                    if (!err) {
                        errMsg += `. Your account has been locked for ${WAITING_TIME_AFTER_LOCKED} seconds.`;
                    }
                    next(errMsg);
                });
            }
        }
    });
}

现在我想要在同一个函数中如果找不到用户名，那么它会插入用户名值并为该用户名执行相同的过程。我怎么能在最有效的编码中做到这一点？ 我试过了：

function _lockIfFailedAttemptsReachLimit(username, req, res, next) {
    colUser.findOneAndUpdate({ username }, { // increase failed attempt counter
        $set: { failedLoginAt: new Date() },
        $inc: { nFailedLogin: 1 },
    }, { upsert: false, returnOriginal: false }, (err, result) => {
        if (err) { // Undefined.
            next('Undefined error!');
        } else {
            let foundUser = result.value;
            if (_.isNil(foundUser)) { // cannot find username
                //I think can try to put the code here ?
                let username = (req.headers['x-forwarded-for'] ||
                    req.connection.remoteAddress ||
                    req.socket.remoteAddress ||
                    req.connection.socket.remoteAddress).split(",")[0];
                // insert username to the table and call the function to continue from the beginning
            }

            let nFailed = _.get(foundUser, 'nFailedLogin', 0);

            let errMsg = `Invalid username or passsword. You have tried ${nFailed}/${MAX_FAILED_LOGIN_ATTEMPTS} login attempts`;

            if (nFailed < MAX_FAILED_LOGIN_ATTEMPTS) {
                next(errMsg);
            } else {
                _lockAccount(username, (err, result) => {
                    if (!err) {
                        errMsg += `. Your account has been locked for ${WAITING_TIME_AFTER_LOCKED} seconds.`;
                    }
                    next(errMsg);
                });
            }
        }
    });
}