djazator is a simple django plugin for sending push messages from django server to sockjs clients. It internally uses zeromq and sockjs-tornado. djazator can send push notifications to all sockjs clients and to subset of this clients.
- pyzmq>=2.0
- sockjs-tornado>=0.0.5
- django>=1.4
Install djazator with your favorite Python package manager:
pip install djazator
Add djazator to your INSTALLED_APPS in settings.py
INSTALLED_APPS = (
'django.contrib.auth',
'djazator',
...
)
Define DJAZATOR_MQ_SOCKET in settings.py
DJAZATOR_MQ_SOCKET = 'tcp://127.0.0.1:8002'
Run zeromq forwarder device
djazator-mq --sub=tcp://127.0.0.1:8002 --pub=tcp://127.0.0.1:8001
Run sockjs-tornado server
djazator-server --port=8080 --mq_socket=tcp://127.0.0.1:8001 --route=/sockjs --address=''
Alternatively, if you don't need multiple tornado instances support, you can entirely omit djazator-mq and should pass -S/--single argument to djazator-server
djazator-server --single --port=8080 --mq_socket=tcp://127.0.0.1:8002 --route=/sockjs --address=''
Append sockjs client library to your page
<head>
<script src="http://cdn.sockjs.org/sockjs-0.3.min.js">
...
Open page in browser and connect to sockjs-tornado server
conn = new SockJS('http://localhost:8080/sockjs')
Define a callback for incoming messages
conn.onmessage = function (e){ console.log(e.data); };
Send a message from django
from djazator.pub import notify_all
notify_all({'msg': u'Hi all!'})
and you will see it in js console
Object {msg: "Hi all!"}
You can send notifications to subset of users.
from djazator.pub import notify from djazator.utils import tokenize from django.contrib.auth.models import User user = User.objects.get(email='[email protected]') notify({'msg': u'Hi, %s!' % user.username}, users=[user]) token = tokenize(user) notify({'msg': u'Hi user with token %s !' % token}, users=[user])
To get this messages you need to subscribe by token
var token = {% djazator_token %};
SockJS.prototype.emit = function (name, data) { // wrapper around SockJS.send for djazator's protocol support
var meta_dict = {
name:name,
data:data
};
this.send(JSON.stringify(meta_dict))
};
conn = new SockJS('http://localhost:8080/sockjs')
conn.emit('subscribe', {'token': token});
conn.onmessage = function (e){ console.log(e.data); };
{% djazator_token %} is nothing more than a wrapper around
djazator.utils.tokenize that returns user.id signed with
standart django singing mechanism. You can configure you own salt by setting
DJAZATOR_SALT in settings.py. If you need more security,
you can provide your own tokenization function. It should accept django User
object and return token. Add path to this function in settings.py .
DJAZATOR_TOKENIZER = 'path.to.my.func'
- djazator serializes datetime objects with ISO 8601 format. You can parse it on client with moment.js .
- djazator server can handle client's messages constructed only in some specific way and can't be used for client to client communications.