cron-tasks.js

var schedule = require('node-schedule'),
    Playlist = require('./models/playlist'),
    subWeeks = require('date-fns/sub_weeks'),
    getTime = require('date-fns/get_time'),
    format = require('date-fns/format'),
    exec = require('child_process').exec,
    path = require('path')

var backupCmd = 'mongodump --db LaBanane --gzip --out '
var backupFolder = path.join(__dirname, 'backup')

// Each day at 4:30 am :
// - Make a daily DB backup
// - Clean old empty playlists

schedule.scheduleJob('30 4 * * *', function () {
    var now = Date.now()
    var aWeekAgo = getTime(subWeeks(now, 1))
    var backupPath = path.join(backupFolder, 'daily')

    exec(backupCmd + backupPath, function (error, stdout, stderr) {
        console.log('stdout: ', stdout)
        console.log('stderr: ', stderr)
        if (error !== null) {
            console.log('exec error: ', error)
        }
    })

    Playlist.remove({timestamp: {$lt: aWeekAgo}, tracks: {$size: 0}}, (err) => {
        if (err) {
            console.error('*** Error during clean task execution ***')
        }
    })
})

// Each first day of the month at 5am :
// - Make a monthly DB backup

schedule.scheduleJob('0 5 1 * *', function () {
    var now = Date.now()
    var backupPath = path.join(backupFolder, format(now, 'YYYY-MM'))

    exec(backupCmd + backupPath, function (error, stdout, stderr) {
        console.log('stdout: ', stdout)
        console.log('stderr: ', stderr)
        if (error !== null) {
            console.log('exec error: ', error)
        }
    })
})