server.js

require('dotenv').config()
console.log('Heroku server URL:', `https://${process.env.SERVER_URL}.herokuapp.com/`)
// Create a web sockets signaling server
let lookup = {}

const hostname = '0.0.0.0';
const port = process.env.PORT || 3001;


const Server = require('bittorrent-tracker').Server

let server = new Server({
  udp: false, // enable udp server? [default=true]
  http: true, // enable http server? [default=true]
  ws: true, // enable websocket server? [default=true]
  stats: true, // enable web-based statistics? [default=true]
})

server.on('error', function (err) {
  // fatal server error!
  //console.log(err.message)
})

server.on('warning', function (err) {
  // client sent bad data. probably not a problem, just a buggy client.
  //console.log(err.message)
})

server.on('listening', function () {
  // fired when all requested servers are listening
  console.log('Signal server http port:' + server.http.address().port)
  console.log('Signal server ws port:' + server.ws.address().port)
})

// listen for individual tracker messages from peers:
server.on('start', function (addr) {
  console.log('got start message from ' + addr)
  Object.keys(server.torrents).forEach(hash => {
    lookup[server.torrents[hash].infoHash] = server.torrents[hash].peers.length
    //console.log("peers: " + server.torrents[hash].peers.length)
  })
})

server.on('complete', function (addr) {})
server.on('stop', function (addr) {})

// start tracker server listening! Use 0 to listen on a random free port.
server.listen(port, hostname, 'listening')