AMQP broadcasting for python and zope.
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zamqp is aimed to broadcast messages and trigger events between python instances via AMQP.

It is based on amqplib and provides consumer and producer implementations as well as a mechanism to trigger zope events remotely.

Helper Classes

Create properties for AMQP connection.

>>> from zamqp import AMQPProps
>>> props = AMQPProps(host='localhost',
...                   user='guest',
...                   password='guest',
...                   ssl=False,
...                   exchange='zamqp.broadcast.fanout',
...                   type='fanout',
...                   realm='/data')

Create AMQP connection manually.

>>> from zamqp import AMQPConnection
>>> connection = AMQPConnection('zamqp_queue', props)

Access connection channel.


Consumer and producer

Create consumer callback.

>>> def callback(message):
...     pass # do anything with received message here

Create and start consumer thread.

>>> from zamqp import AMQPConsumer
>>> from zamqp import AMQPThread
>>> consumer = AMQPConsumer('zamqp_queue', props, callback)
>>> thread = AMQPThread(consumer)
>>> thread.start()

Create producer and send a messages. Every python object which is serializable can be used as a message.

>>> from zamqp import AMQPProducer
>>> producer = AMQPProducer('zamqp_queue', props)
>>> message = 'foo'
>>> producer(message)

Trigger events

Create an event which should be triggered in the remote instance.

>>> class MyEvent(object):
...     def __init__(self, name):
... = name

Create a listener for MyEvent. This gets called when AMQP events are received.

>>> def my_listener(event):
...     if not isinstance(event, MyEvent):
...         return
...     # do something

>>> import zope.event
>>> zope.event.subscribers.append(my_listener)

The default AMQPEventCallback just calls zope.event.notify with the received payload, which is the serialized event, in this case an instance of MyEvent.

Start our AMQP consumer for events.

>>> exchange = ''
>>> queue = 'zamqp_events'
>>> from zamqp import AMQPEventCallback
>>> props = AMQPProps(exchange=exchange)
>>> callback = AMQPEventCallback()
>>> consumer = AMQPConsumer(queue, props, callback)
>>> thread = AMQPThread(consumer)
>>> thread.start()

Trigger MyEvent to AMQP channel. The previously started event consumer now receives this event and triggers it locally in it's own interpreter.

>>> from zamqp import AMQPEvent
>>> event = AMQPEvent(queue, props, MyEvent('myevent'))
>>> zope.event.notify(event)


-Robert Niederreiter <>



  • add runner module [rnix, 2010-12-11]


  • make it work [rnix]