Develop Reference

Socket.io "Listeners is undefined"

Sorry if i'm ignorant or there is an actual problem here. I am hosting a http server with node.js, and apon running the server I get the error
C:\Users\Xander\Desktop\Website>node ./processes.js
C:\Users\Xander\Desktop\Website\node_modules\socket.io\node_modules\engine.io\lib\server.js:
var listeners = server.listeners('request').slice(0);
^
TypeError: Cannot read property 'listeners' of undefined
at Server.attach
(C:\Users\Xander\Desktop\Website\node_modules\socket.io\node_modules\engine.io\lib\server.js:423:25)
at Function.attach (C:\Users\Xander\Desktop\Website\node_modules\socket.io\node_modules\engine.io\lib\engine.io.js:124:10)
at Server.listen.Server.attach (C:\Users\Xander\Desktop\Website\node_modules\socket.io\lib\index.js:228:21)
at Object.<anonymous> (C:\Users\Xander\Desktop\Website\processes.js:8:21)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Function.Module.runMain (module.js:441:10)
at startup (node.js:139:18)
This error has not occurred before and just recently came up. I've tried reinstalling socket.io, and personally editing the file. Though, to no avail. It fails every time. So i'll gladly take advice on how to fix this. Thank you for your time...
How its being used
//Vars
var http = require('http');
var express = require("express");
var app = express();
var path = require("path");
var connect = require("connect");
var io = require('socket.io').listen(server);
var socket = io.listen(server);
//Defined port
const PORT = 8080;
//Connection handler
function handleRequest(request, response){
response.end(request.url);
};
var server = http.createServer(handleRequest);
//Log all connections made
//Show .html file
app.get('/',function(req,res){
res.sendFile(path.join(__dirname+'/index.html'));
});
//Port to listen to
app.listen(8080);

In this line of your code:
var io = require('socket.io').listen(server);
server is undefined.
You can probably change this:
app.listen(8080);
to this:
var server = app.listen(8080);
var io = require('socket.io').listen(server);
And, get rid of these that are too early in your code:
var io = require('socket.io').listen(server);
var socket = io.listen(server);
And, remove these too since you're using Express as your server:
function handleRequest(request, response){
response.end(request.url);
};
var server = http.createServer(handleRequest);

Object #<MongoClient> has no method 'open'

I've been trying to make a simple site with Node.js, Express.js, and MongoDB. I'm new to these technologies and have been having problem set up the database
Here is snippet of code in my index.js file:
var http = require('http'),
express = require('express'),
path = require('path'),
MongoClient = require('mongodb').MongoClient,
Server = require('mongodb').Server,
CollectionDriver = require('./collectionDriver').CollectionDriver;
var app = express();
app.set('port', process.env.PORT || 3000);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
var mongoHost = 'localHost';
var mongoPort = 27017;
var collectionDriver;
var mongoClient = new MongoClient(new Server(mongoHost, mongoPort));
mongoClient.open(function(err, mongoClient) {
if (!mongoClient) {
console.error("Error! Exiting... Must start MongoDB first");
process.exit(1);
}
var db = mongoClient.db("MyDatabase");
collectionDriver = new CollectionDriver(db);
});
After I try to run node index.js in terminal, it says the following:
js-bson: Failed to load c++ bson extension, using pure JS version
/Users/username/dev/ga-final/index.js:31
mongoClient.open(function(err, mongoClient) { //C
^
TypeError: Object #<MongoClient> has no method 'open'
at Object.<anonymous> (/Users/username/dev/ga-final/index.js:31:13)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
What is wrong? Why can't I call open? Can you help me fix this? thanks!

This is happening may be because you are using new version of mongodb it is working fine after I use mongodb driver version 1.4.
npm install mongodb#1.4.x

Take a look at the mongodb docs. Your mongoClient object is not what you think it is, and that why there isn't an open() method available.
Make your example code look more like theirs:
var MongoClient = require('mongodb').MongoClient
, assert = require('assert');
// Connection URL
var url = 'mongodb://localhost:27017/myproject';
// Use connect method to connect to the Server
MongoClient.connect(url, function(err, db) {
assert.equal(null, err);
console.log("Connected correctly to server");
db.close();
});

socket.io doesn't seem to be starting and doesn't recognize io.configure method

I am trying to get socket.io running with node/express (I have done this countless times - so I am pretty baffled). When I try to configure socket.io with the io.configure method I get an error:
io.configure(function() {
^
TypeError: Object #<Server> has no method 'configure'
at Object.<anonymous> (/home/yz/webdev/ground/app.js:377:4)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:902:3
My code is exactly how it says to do it on socket.io - but I'll post it just in case:
var express = require('express');
var app = express();
var server = require('http').createServer(app);
var io = require('socket.io').listen(server);
server.listen(8000);
//other declarations
app.use(...
passport.use(...
//some routes
app.get(...
app.post(...
io.configure(function() {
io.set('transports', ['websocket','xhr-polling','flashsocket']);
io.set('flash policy port', 10843);
});
io.sockets.on('connection', function (socket) {
socket.on('message', function (data) {
...
});
});
The error gets thrown at the io.configure method - I have done this before with other sites, I don't understand whey it isn't working now. Thanks.
UPDATE
I was just reading here that io.configure doesn't exist anymore - however, I can't seem to get it working the new way either. Here is my new code:
var express = require('express');
var app = express();
var server = require('http').createServer(app);
//var io = require('socket.io').listen(server);
var socket = require('socket.io')({
'transports': ['websocket','xhr-polling','flashsocket'],
'flash policy port': 10843
});
var io = socket.listen(server);
io.sockets.on('connection', function (socket) {
socket.on('message', function (data) {
...
});
});
I'm not getting any errors, socket.io just doesn't seem to be starting.

You're assigning io to a server, which is causing the problems when you attempt to call functions on io which are available from socket.io. Try replacing this line:
var io = require('socket.io').listen(server);
With this line:
var io = require('socket.io')(server);
The socket.io docs list a couple of configuration patterns you can take advantage of, and it is possible to create a server using socket.io. But since you're already creating a server, you shouldn't need to do it with socket.io.

Cannot get my file to display through Node.js

I'm having problems with my node server. I'm trying to gather data from my coffees.js file which is in a routes folder by linking it to my server.js file. Both my server.js file and routes folder containg the coffees.js file are in my nodeservers folder. When I run the server.js (which is probably the problem as I think it is coded wrong) I get the following error:
Server running at http-00000000-:8080/
Listening on port 8080...
events.js:72
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE
at errnoException (net.js:904:11)
at Server._listen2 (net.js:1042:14)
at listen (net.js:1064:10)
at Server.listen (net.js:1138:5)
at Function.app.listen (/node_modules/express/lib/application.js:533:24)
at Object.<anonymous> (/home/ec2-user/nodeservers/simpleserver.js:19:5)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
[ec2-user#ip-10-74-151-139 nodeservers]$ ^C
[ec2-user#ip-10-74-151-139 nodeservers]$
My simpleserver.js file looks like this:
// Load the http module to create an http server.
var http = require('http');
// Configure our HTTP server to respond with Hello World to all requests.
var server = http.createServer(function (request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
response.end("Hello World\n");
});
// Listen on port 8000, IP defaults to 127.0.0.1
server.listen(8080);
// Put a friendly message on the terminal
console.log("Server running at http://127.0.0.1:8080/");
var express = require('express'),
coffees = require('./routes/coffees');
var app = express();
app.get('/coffees', coffees.findAll);
app.get('/coffees/:id', coffees.findById);
app.listen(8080);
console.log('Listening on port 8080...');
Anyone able to tell me whats wrong?

Remove either
server.listen(8080) or app.listen(8080).
I think you want to use express, so remove the first.

Express has no method configure error

I'm trying to get started with the MEAN stack. And I'm following this tutorial: link
I have made it until the Test Our Server section. Here
// modules =================================================
var express = require('express');
var app = express();
var mongoose= require('mongoose');
// configuration ===========================================
// config files
var db = require('./config/db');
var port = process.env.PORT || 8080; // set our port
mongoose.connect(db.url); // connect to our mongoDB database (uncomment after you enter in your own credentials in config/db.js)
app.configure(function() {
app.use(express.static(__dirname + '/public')); // set the static files location /public/img will be /img for users
app.use(express.logger('dev')); // log every request to the console
app.use(express.bodyParser()); // have the ability to pull information from html in POST
app.use(express.methodOverride()); // have the ability to simulate DELETE and PUT
});
// routes ==================================================
require('./app/routes')(app); // configure our routes
// start app ===============================================
app.listen(port); // startup our app at http://localhost:8080
console.log('Magic happens on port ' + port); // shoutout to the user
exports = module.exports = app; // expose app
When I run
nodemon server.js
I get this error
app.configure(function() {
^
TypeError: Object function (req, res, next) {
app.handle(req, res, next);
} has no method 'configure'
at Object.<anonymous> (C:\Users\Yuksel\Desktop\node\test\server.js:14:5)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:902:3
5 Mar 17:27:20 - [nodemon] app crashed - waiting for file changes before startin
g...
It simply says app has no method configure(I guess). But when I delete the configure part and run it again, it works.(This mean app has .listen method, so it is an express object.)
I have tried with both node and nodemon. And I couldn't figure it out. Thank you for your time.

Tom in his blog post new-features-node-express-4 provides examples of how to convert from using app.configure in express version 3.x to removing it in express version 4.0.
For convenience I added the code example below.
Version 3.x
// all environments
app.configure(function(){
app.set('title', 'Application Title');
})
// development only
app.configure('development', function(){
app.set('mongodb_uri', 'mongo://localhost/dev');
})
// production only
app.configure('production', function(){
app.set('mongodb_uri', 'mongo://localhost/prod');
})
Version 4.0
// all environments
app.set('title', 'Application Title');
// development only
if ('development' == app.get('env')) {
app.set('mongodb_uri', 'mongo://localhost/dev');
}
// production only
if ('production' == app.get('env')) {
app.set('mongodb_uri', 'mongo://localhost/prod');
}

The configure method has been removed from express as of version 4.0.0 (including 4.0.0-rc2). See the changelog at https://github.com/strongloop/express/blob/master/History.md#400--2014-04-09