smartfacecloud-emulator-dispatcher/src/dispatcher/combineWSSExpress.js

Handles Emulator Dispatcher Part of SmartfaceCloud

/**
 * @typedef {Object} getCombinedWSSResult
 * @prop {WebSocketServer} wss - Object created to handle ws connections
 * @prop {http.Server} server - HTTP Server object created on the way
 * @prop {ExpressApp} app - Provided app value or newly created one
 * 
 * 
 * Creates a combined WebSocketServer with Express Server
 * @param {WebSocketServer} WebSocketServer - class of WebSocketServer
 * @param {express} express - library of express
 * @param {Object|number} options - WSS options or the port number; server value will be replaced
 * @param {ExpressApp} app - (Optional) Previously created express app; If empty one will be created automatically
 * @return {getCombinedWSSResult} - wss and all created artifacts along the way
 */
const LogToConsole = require("../common/LogToConsole");

function getCombinedWSS(WebSocketServer, express, options, app) {
    const execSync = require('child_process').execSync;
    var http = require("http");
    app = app || express();
    var server = http.createServer(app);
    var port;
    var log = new LogToConsole(options.logToConsole, '[HTTP]').log;

    if (typeof options === "number") {
        port = options;
        options = {};
    }
    else {
        port = options.port;
        delete options.port;
    }
    if (global.v8debug) {
        try {
            execSync('fuser -k 8081/tcp');
        }
        catch (ex) {
            // do nothing; process is not running; everything is OK
        }
    }
    server.on("error", function(err) {
        if (global.v8debug) {
            debugger;
        }
        else {
            log("**ERROR**", err);
            throw err;
        }
    });
    server.listen(port);
    options.server = server;

    log("Server listening on", port);
    var wss = new WebSocketServer(options);

    return {
        wss: wss,
        server: server,
        app: app
    };
}
module.exports = getCombinedWSS;