async-signal

This package provide a class to connect signals (using asyncio) to your functions.
Works on Python3.4+

Install

Install via pip:

$ pip install async-signal

Getting started

This package provides a class to create signals with asyncio. The main concepts to understand how to use are:

• Sender - the class that will dispatch the signal
• Receiver - the asyncio coroutine that will receive this signal

For this work, you need to connect a "Receiver" to a "Sender". see the example below:

Creating a "was_multiplied" signal

from async_signal.signals import Signal

# The receiver function will receive these arguments
was_multiplied = Signal(arguments=['result'])

Creating the Sender to Dispatch the Signal

The sender must be a function, class or some object that have the attributes __module__ and __name__

def multiply_by_2(self, number):
    result = number * 2
    # This will emit to all receivers this result
    was_multiplied.dispatch(sender=self, result=result)

Connecting a receiver to this signal

The receiver must use the @asyncio.coroutine decorator

import asyncio


@asyncio.coroutine
def listen_multiply(sender, result):
    # Every time that the function multiply_by_2 is called
    # This signal will receive the result
    # if multiply_by_2(10) is called, this function will print:
    # >> 20
    print(result)


was_multiplied.connect(sender=multiply_by_2, receiver=listen_multiply)