shutdown-handler/shutdown-handler.js

Gives the ability to execute code upon closing a Node.js application.

/**
 * Copyright (c) 2013 Robert Böhm
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

var tty = require("tty");
var events = require("events");

var ShutdownHandler = new events.EventEmitter();

var shutdown = function() {
  var e = {
    preventDefault: function() { this._preventDefault = true; }
  };
  ShutdownHandler.emit("exit", e);
  if (!e._preventDefault) {
    process.exit(0);
  }
};

process.on("SIGINT", shutdown);
process.on("SIGTERM", shutdown);
// https://github.com/joyent/node/issues/8204
if (typeof process.stdin.setRawMode === "function") {
  process.stdin.setRawMode(true);
}
process.stdin.resume();
process.stdin.on("data", function (input) {
  for (var i = 0; i < input.length; i++) {
    if (input[i] === 0x03) return shutdown();
  }
});


module.exports = ShutdownHandler;