pyee

pyee supplies an EventEmitter object similar to the EventEmitter from Node.js.

There is also the possibility to use mqtt topic patterns to match events

Example:

In [1]: from pyee import EventEmitter

In [2]: ee = EventEmitter()

In [3]: @ee.on('event')
   ...: def event_handler():
   ...:     print 'BANG BANG'
   ...:

In [4]: ee.emit('event')
BANG BANG

In [5]:

In [6]: ee.on('a/+/c', lambda ...)

Easy-peasy.

Installation:

sudo pip install pyee

Methods:

ee.on(event, f=None): Registers the function f to the event name event. Example:

ee.on('data', some_fxn)

If f is not specified, ee.on returns a function that takes f as a callback, which allows for decorator styles:

@ee.on('data')
def data_handler(data):
    print data

ee.emit(event, *args, **kwargs): Emits the event, calling the attached functions with *args. For example:

ee.emit('data', '00101001')

This will call data('00101001')' (assuming data is an attached function). Returns False if no functions are attached to handle the emission (otherwise True).

ee.once(event, f=None): The same as ee.on, except that the listener is automatically removed after it's called.

ee.remove_listener(event, fxn): Removes the function fxn from event. Requires that the function is not closed over by ee.on (using this with the decorator style is unfortunately not possible).

ee.remove_all_listeners(event): Removes all listeners from event.

ee.listeners(event): Returns the array of all listeners registered to the given event.

(Special) Events:

"new_listener": Fires whenever a new listener is created. Listeners for this event do not fire upon their own creation.

"error": When emitted raises an Exception by default, behavior can be overriden by attaching callback to the event. For example:

@ee.on('error')
def onError(message):
    logging.err(message)

ee.emit('error', Exception('something blew up'))

Tests:

nosetests

License:

MIT.