simple-tcp-proxy/dist/helper.js

Simple TCP Proxy

"use strict";

var net = require('net');
/** @module helper */

/**
 * create a listener which runs the parameter function with the data from the listener
 *
 * @param {function(Error)} errorFunction function to run inside the return function
 * @return {function(Error)} errorListener runs errorFunction with own parameter
 */


function errorListener(errorFunction) {
  return (
    /** @param {Error} errMsg Error Msg */
    function (errMsg) {
      if (errorFunction) errorFunction(errMsg);
    }
  );
}
/**
 * create a listener which writes the data to the socket
 *
 * @param {module:net.Socket} socket socket where the data is written to
 * @return {function((Uint8Array | string))} listener which writes data to the socket
 */


function dataListener(socket) {
  return function (data) {
    if (socket) socket.write(data);
  };
}
/**
 * destroys the socket it the Listener is fired
 *
 * @param {module:net.Socket} socket to destroy
 * @return {function()} listener which will destroy the socket
 */


function closeListener(socket) {
  return function () {
    if (socket) socket.destroy();
  };
}
/**
 * create a socket to given parameter
 *
 * @param {Number} port port of the server
 * @param {String} host host of the server
 * @return {module:net.Socket}
 */


function getSocket(port, host) {
  var socket = new net.Socket();
  socket.connect(port, host);
  return socket;
}

module.exports = {
  errorListener: errorListener,
  dataListener: dataListener,
  closeListener: closeListener,
  getSocket: getSocket
};