lance-pro/src/matchmaker/MatchMakerTarget.js

Pro Tools for Lance multiplayer game server

'use strict';

const process = require('process');
const GAMESTATUS_PATH = '/gameStatus';
const DEFAULT_POLL_PERIOD = 1000;

class MatchMakerTarget {

    /**
    * Constructor of the MatchMaker singleton.
    * @param {Object} expressApp - Reference to the express app
    * @param {ServerEngine} serverEngine - Reference to the game's ServerEngine instance
    * @param {Object} options - matchmaker options
    * @param {Number} options.pollPeriod - gameserver polling interval in milliseconds.  Default 10000
    */
    constructor(expressApp, serverEngine, options) {

        this.shutDownStarted = false;
        this.serverEngine = serverEngine;
        expressApp.get(GAMESTATUS_PATH, this.gameStatus.bind(this));

        this.options = Object.assign({
            pollPeriod: DEFAULT_POLL_PERIOD
        }, options);

        // delay shutdown gracefully
        process.on('SIGINT', () => {
            this.shutDownStarted = true;
            console.log('\n\n\n\nSHUTTING DOWN - PLEASE WAIT\n\n\n\n');
            setTimeout(() => {
                console.log('\n\n\n\nSERVER SHUTDOWN COMPLETE');
                process.exit();
            }, this.options.pollPeriod * 1.5);
        });
    }

    gameStatus(req, res) {
        if (this.shutDownStarted)
            res.sendStatus(404);
        else
            res.send(this.serverEngine.gameStatus(req.query));
    }

}

module.exports = MatchMakerTarget;