var MongoClient = require('mongodb').MongoClient
var url = 'mongodb://localhost:27017/myproject';
function output (user, orders) {
    // output data in pretty format
}

function logError (error) {
    // Log the error (could be console, a service, a file etc)
}

// Connect to mongo server
MongoClient.connect(url, (err, db) => {
    const userId = process.argv[2];
    db.collection('access_log').insert({ userId, date: new Date() }, (err, result) => {
        if (err) {
            logError(err);
        } else {
            db.collection('users').find({ userId }).toArray((err, users) => {
                if (err) {
                    logError(err);
                } else {
                    db.collection('orders').find({ userId }).toArray((err, orders) => {
                        if (err) {
                            logError(err);
                        } else {
                            output(users[0], orders);
                        }
                    });
                }
            });
        }
    });
});