bonescriptjtjk/src/server.js

Physical computing library for embedded Linux

// Copyright (C) 2011 - Texas Instruments, Jason Kridner
//
//
var fs = require('fs');
var http = require('http');
var winston = require('winston');
var express = require('express');
var events = require('events');
var socketHandlers = require('./socket_handlers');

var serverEmitter = new events.EventEmitter();

var debug = process.env.DEBUG ? true : false;

myrequire('systemd', function() {
    if(debug) winston.debug("Startup as socket-activated service under systemd not enabled");
});

exports.serverStart = function(port, directory, callback) {
    if(port === undefined) {
        port = (process.env.LISTEN_PID > 0) ? 'systemd' : ((process.env.PORT) ? process.env.PORT : 80);
    }
    if(directory === undefined) {
        directory = (process.env.SERVER_DIR) ? process.env.SERVER_DIR : '/usr/share/bone101';
    }
    var server = mylisten(port, directory);
    serverEmitter.on('newListner', addServerListener);

    function addServerListener(event, listener) {
        console.log('got here'); //TODO: not getting here
        if(debug) winston.debug('Got request to add listener to ' + event);
        var serverEvent = event.replace(/^server\$/, '');
        if(serverEvent) {
           if(debug) winston.debug('Adding listener to server$' + serverEvent);
           server.on(serverEvent, listener);
        }
    }

    return(serverEmitter);
};

function mylisten(port, directory) {
    winston.info("Opening port " + port + " to serve up " + directory);
    var app = express();
    app.get('/bonescript.js', socketHandlers.socketJSReqHandler);
    app.use('/bone101', express.static(directory));
    app.use('/bone101/static', express.static(directory+"/static"));
    app.use(express.static(directory));
    var server = http.createServer(app);
    socketHandlers.addSocketListeners(server, serverEmitter);
    server.listen(port);
    return(server);
}

function myrequire(packageName, onfail) {
    var y = {};
    try {
        y = require(packageName);
        y.exists = true;
    } catch(ex) {
        y.exists = false;
        if(debug) winston.debug("Optional package '" + packageName + "' not loaded");
        if(onfail) onfail();
    }
    return(y);
}