Mesos stream replay server

stream.js

const http = require('http')
const port = 3000

var fs = require('fs');

const requestHandler = (request, response) => {
  console.log("Connected")

  response.setHeader("Access-Control-Allow-Origin", "*")
  response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")

  request.on("close", function() {
    console.log("request closed unexpectedly");
  })

  request.on("end", function() {
    console.log("request ended normally");
  })

  fs.readFile(process.argv[2], 'utf8', function(err, contents) {
    if (err) console.log(err)

    response.write(contents.substr(0, contents.length - 1))

    setInterval(function() {
      console.log("heartbeat")
      response.write("20\n{type:\"HEARTBEAT\"}")
    }, 10000)
  })
}

const server = http.createServer(requestHandler)

server.listen(port, (err) => {
  if (err) {
    return console.log('something bad happened', err)
  }

  console.log(`server is listening on ${port}`)
})

if (!process.argv[2]) {
  console.log("Usage: node stream.js <stream_log.json>");
  exit();
}