mongodb lib

const mongodb = require('mongodb');
const MongoClient = mongodb.MongoClient;

const config = require('../config');

const url = config.connectionString;

let connection;
const getConnection = () => connection;

let users;
let log;

module.exports = {
    getConnection: getConnection,
    closeConnection: () => {
        if (connection) {
            connection.close();
        }
    },
    init: () => {
        process.once('SIGUSR2', () => {
            connection.close(() => {
                process.kill(process.pid, 'SIGUSR2');
            });
        });

        return MongoClient
            .connect(url)
            .then((conn) => {
                console.log('Connected to MongoDB');
                connection = conn;
                users = conn.collection('users');
                log = conn.collection('log');
                return connection;
            });
    },
    collections: {
        users: () => users,
        log: () => log,
    }
};