PortForwarder.js

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var net = require('net');
var config = require('config');
var _ = require('underscore');
var Connection = require('./Connection').Connection;

function PortForwarder(config) {
    if (!(this instanceof PortForwarder)) {
        return new PortForwarder();
    }
    
    this.config = config;
}

PortForwarder.DEFAULT_SERVER_PORT = 6000;

PortForwarder.prototype.main = function () {
    this.server = net.createServer();
    this.server.on('connection', this._onConnection.bind(this));
    this.server.listen(this._getServerPort(), this._onListen.bind(this));
};

PortForwarder.prototype._onConnection = function (c) {
    new Connection(this.config.client, c);
};

PortForwarder.prototype._onListen = function () {
    console.log('Server listening on port ' + this._getServerPort());
};

PortForwarder.prototype._getServerPort = function () {
    return !_.isUndefined(this.config.server) && !_.isUndefined(this.config.server.port) && _.isNumber(this.config.server.port) ? this.config.server.port : PortForwarder.DEFAULT_SERVER_PORT;
};

new PortForwarder(config).main();