Echtzeit-Benachrichtigungen mit Django und Socket.io

Question

Derzeit implementiere ich Echtzeit-Benachrichtigungen für mein Django-Projekt.

Ich befolge die Anweisungen von this tutorial. Problem ist, ich benutze Socket.io 1.4.5 und Tutorial ist für Pre-1.0-Versionen geschrieben. Also musste ich einige Code nach 'Migrating from 0.9' Richtlinie auf Socket.io Website anpassen. Was ich habe ist:

var http = require('http'); 
var server = http.createServer().listen(8002); 
var io = require('socket.io')(server); 
var cookie_reader = require('cookie'); 
var querystring = require('querystring'); 
var redis = require('redis'); 

// Supposedly this should store cookie set by Django 
io.use(function(socket,accept){ 
    var data = socket.request; 
    if(data.headers.cookie){ 
    data.cookie = cookie_reader.parse(data.headers.cookie); 
    return accept(null, true); 
    } 
    return accept('error', false); 
}); 

io.sockets.on('connection', function (socket) { 

    // Redis client 
    client = redis.createClient(); 

    // Subscribe to notification channel 
    client.subscribe('notifications.' + socket.handshake.cookie['sessionid']); 
    console.log('subscribed'); 

    //Grab message from Redis and send to client 
    client.on('message', function(channel, message){ 
     console.log('on message', message); 
     socket.send(message); 
    }); 

    // Unsubscribe 
    socket.on('disconnect', function() { 
     client.unsubscribe('notifications.' + socket.handshake.cookie['sessionid']); 
    }); 
}); 

Wenn ich renne dieses Skript:

node notifications.js 

Nach 2 Sekunden Stille ich diese Fehlermeldung erhalten:

client.subscribe('notifications.' + socket.handshake.cookie['sessionid']); 
                 ^
TypeError: Cannot read property 'sessionid' of undefined 
at Namespace.<anonymous> (path/to/notifications.js) 
at Namespace.emit (events.js:107:17) 
at Namespace.emit (/path/to/node_modules/socket.io/lib/namespace.js:206:10) 
at /path/to/node_modules/socket.io/lib/namespace.js:174:14 
at process._tickCallback (node.js:355:11) 

Kann jemand mir zeigen, was ich habe falsch gemacht?

Answer 1

Gerade gefunden, was mein Fehler war.

Um auf Cookie zuzugreifen, anstelle von socket.handshake sollte ich socket.request verwenden. So sieht mein aktueller Code jetzt so aus:

var http = require('http'); 
var server = http.createServer().listen(8002); 
var io = require('socket.io')(server); 
var cookie_reader = require('cookie'); 
var querystring = require('querystring'); 
var redis = require('redis'); 

io.use(function(socket,accept){ 
    var data = socket.request; 
    if(data.headers.cookie){ 
     data.cookie = cookie_reader.parse(data.headers.cookie); 
     return accept(null, true); 
    } 
    return accept('error', false); 
}); 

io.on('connection', function (socket) { 

    // Redis client 
    client = redis.createClient(); 

    // Subscribe to notification channel 
    client.subscribe('notifications.' + socket.request.cookie['sessionid']); 
    console.log('subscribed'); 

    //Grab message from Redis and send to client 
    client.on('message', function(channel, message){ 
     console.log('on message', message); 
     socket.send(message); 
    }); 

    // Unsubscribe 
    socket.on('disconnect', function() { 
     client.unsubscribe('notifications.' + socket.request.cookie['sessionid']); 
    }); 
});