gurubot2/src/server/modules/db.js

const { MongoClient } = require('mongodb');

async function getDBConnection(config, logger) {
    try {
        const client = await MongoClient.connect(config.mongoUrl, {
            useNewUrlParser: true
        });

        const db = client.db(config.mongoDbName);

        logger.verbose('Connected to MongoDB successfully');

        return db;

    } catch (err) {
        logger.warn('Error connecting to MongoDB');

        throw err;
    }
}

module.exports = {
    getDBConnection
};