Test connection via node

test_conn.js

var net = require('net');

function test_connection(addr, port, cb) {
  var client = net.createConnection(port, addr);
  var start = (new Date()).getTime();
  client.on('connect', function () {
    var end = (new Date()).getTime();
    client.end();
    client.destroy();
    cb(null, (end - start));
  });
  client.on('error', function (err) {
    client.end();
    client.destroy();
    cb(err, null);
  });
  client.on('timeout', function () {
    client.destroy();
    cb(new Error("Connection Timeout"));
  });
};

test_connection("google.com", 80, function (err, time) {
  if (err) { return console.error(err) };
  console.log("Connected in " + time + "ms");
});

// Multiple could look something like this
var hosts = require('./some_config_file');
hosts.forEach(function (host) {
  test_connection(host.addr, host.port, function (err, time) {
    if (err) {
      console.error("Host " + host.addr + " failed with error:", err);
      now_panic_and_freak_out();
      return null;
    }
    console.log("Connected in " + time + "ms");
    report_success({address: host.addr, port: host.port, time: time});
  });
});