Number doubling service

server.js

'use strict';

var net = require('net');
var LineInputStream = require('line-input-stream');

var END_MESSAGE = new Buffer("Thank you for using the nodejs doubling service\n");

var server = net.createServer(function(socket) {
  var processLine = function(line) {
    if (line.trimRight() === 'end') {
      socket.end(END_MESSAGE);
    } else {
      var j = parseInt(line);
      if (isNaN(j)) {
        socket.write("not an int: <" + line + ">\n");
      } else {
        socket.write((j * 2) + "\n");
      }
    }
  };

  new LineInputStream(socket).on('line', processLine);

  socket.on('timeout', function() {
    socket.end('timeout');
  });

  socket.on('error', function(err) {
    // silently ignore error
  });
});

server.listen(44444);