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pypm install juggernaut

How to install juggernaut

  1. Download and install ActivePython
  2. Open Command Prompt
  3. Type pypm install juggernaut
 Python 2.7Python 3.2Python 3.3
Windows (32-bit)
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Windows (64-bit)
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Mac OS X (10.5+)
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Linux (32-bit)
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Linux (64-bit)
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Lastest release
version 0.2 on Dec 6th, 2011

Dead simple Python library that connects to a juggernaut via redis. It also provides a very basic roster implementation that can be used as a daemon process to manage online users.

Basic usage

How to send a message to all subscribers of a channel:

from juggernaut import Juggernaut
jug = Juggernaut()
jug.publish('channel', {'message': 'Hello World!'})

Connection Events

Juggernaut also allows you to subscribe to events (new subscription, unsubscribe event) so that you can respond to users going online and offline:

from juggernaut import Juggernaut
jug = Juggernaut()
for event, data in jug.subscribe_listen():
    if event == 'subscribe':
    elif event == 'unsubscribe':

Since this is quite common this library also implements a Roster that can group multiple connections to the same user. For grouping this it uses a key in the meta part of the message. The default is user_id in the meta object.

Example usage:

from juggernaut import Juggernaut, RedisRoster
jug = Juggernaut()
roster = RedisRoster(jug)

By default it keeps the number of online users in redis so that you can use the roster class to see if users are online:

>>> roster.get_online_users()
[42, 23]
>>> roster.is_user_online(42)
>>> roster.is_user_online(99)

If you want to respond to users signing in and out you need to override the on_signed_in and on_signed_out methods:

class MyRoster(RedisRoster):
    def on_signed_in(self, user_id):
        print 'User signed in', user_id
    def on_signed_out(self, user_id):
        print 'User signed out', user_id

You can for instance use juggernaut to broadcast that to other users that signed in.

  1. 2011 by Armin Ronacher.

BSD, see LICENSE for more details.

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Last updated Dec 6th, 2011

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