Node server to simulate streaming log files

logServer.js

var http   = require('http');
var stream = require('stream');
var util   = require('util');

var PassThrough = stream.PassThrough ||
  require('readable-stream').PassThrough;

var server = http.createServer(function (req, res){
  var timestamp = Date.now();
  var stream    = new PassThrough();

  stream.pipe(res);
  stream.pipe(process.stdout);

  stream.write(util.format('%s: connected\n', timestamp));

  var interval = setInterval(function (){
    stream.write(util.format('%s: new line @%s\n', timestamp, Date.now()));
  }, process.argv[3] || 500);

  req.on('close', function (){
    stream.end(util.format('%s: disconnected\n', timestamp));
    clearInterval(interval);
  });
});

server.listen(process.argv[2] || 8080);

Usage:

node logServer.js [port] [interval]