Nexus 64GB Check

nexus-check.js

// check if a Nexus 64GB is available

const urls = {
    'White 64GB' : 'https://play.google.com/store/devices/details/Nexus_6_64_GB_Cloud_White?id=nexus_6_white_64gb&psid=3&iphc=true'
  //, 'White 32GB' : 'https://play.google.com/store/devices/details/Nexus_6_32_GB_Cloud_White?id=nexus_6_white_32gb&psid=3&iphc=true'
  , 'Blue 64GB'  : 'https://play.google.com/store/devices/details/Nexus_6_64_GB_Midnight_Blue?id=nexus_6_blue_64gb&psid=3&iphc=true'
  //, 'Blue 32GB'  : 'https://play.google.com/store/devices/details/Nexus_6_32_GB_Midnight_Blue?id=nexus_6_blue_32gb&psid=3&iphc=true'
}


const hyperquest = require('hyperquest')
    , bl         = require('bl')
    , cheerio    = require('cheerio')
    , map        = require('map-async')
    , mandrill   = require('mandrill-api/mandrill') // postmark is probably a better choice here

    , email      = process.env.MANDRILL_KEY && new mandrill.Mandrill(process.env.MANDRILL_KEY)


function checkModel (model, callback) {
  hyperquest.get(urls[model])
    .pipe(bl(function (err, _data) {
      if (err)
        return callback(err)

      var $          = cheerio.load(_data)
        , available  = $('[data-availability]').attr('data-availability') == 'AVAILABLE'
        , pricematch = available && $('.buy-button-container span').text().match(/\w\$[\d\.]+/i)
        , price      = pricematch && pricematch[0]

      if (available && !price)
        return callback(new Error(`Derp, something's up with the page for ${model}`))

      callback(null, { model: model, price: available && price })
    }))
}


function done (err, availability) {
  if (err)
    throw err

  var msgs = availability.map(function (a) {
    return (`Nexus ${a.model} is ` + (a.price ? `available for ${a.price}` : 'not available'))
  })

  // if no MANDRILL_KEY env var set, dump to stdout
  if (!email)
    return console.log(msgs.join('\n'))

  // don't send email if nothing available
  if (!availability.some(function (a) { return a.price }))
    return

  var message = {
      html       : msgs.join('<br>')
    , subject    : 'Nexus availability'
    , from_email : 'rod@vagg.org'
    , from_name  : 'Rod Vagg'
    , to: [{
          email : 'rod@vagg.org'
        , name  : 'Rod Vagg'
        , type  : 'to'
    }]
  }

  email.messages.send({ message: message }, function (result) {
    if (result[0].status != 'sent')
      throw new Error('Email not sent! [' + result[0].status + ']')
  })
}


map(Object.keys(urls), checkModel, done)