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[英]Django: JSON Notifications using Redis PubSub, Node.js & Socket.io
[英]Real time notifications with Django and Socket.io
目前我正在为我的 Django 项目实现实时通知。
我正在按照本教程中的说明进行操作。 问题是,我使用的是 Socket.io 1.4.5,教程是为 1.0 之前的版本编写的。 因此,我必须按照 Socket.io 站点上的“从 0.9 迁移”指南修改一些代码。 我得到的是:
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']);
});
});
当我运行这个脚本时:
node notifications.js
沉默 2 秒后,我收到此错误:
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)
有人可以指出我做错了什么吗?
刚刚发现我的错误是什么。
要访问 cookie,我应该使用socket.request
而不是socket.handshake
。 所以我当前的代码现在看起来像这样:
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']);
});
});
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