Hello,

I am currently writing an event-driven client library for a network protocol [1] and chose to use the new asyncio module. I have no experience with asynchronous IO and don't understand all the concepts in asyncio yet. So I'm not sure if asyncio is actually the right choice .

My goal:
I want to provide an easy to use interface to the network protocol.

What I have so far:
I internally use the asyncio event loop and and the user can register event handler functions for specific events triggered by the network input.
Reduced to the essentials the architecture of my code looks like this:

class Client(asyncio.Protocol):

    def __init__(self, handler, server, port):
        self._handler = handler
        self._server = server
        self._port = port

    def run(self):
        loop = asyncio.get_event_loop()
        task = asyncio.Task(loop.create_connection(self, server, port))
        loop.run_until_complete(task)
        loop.run_forever()

    def data_received(self, data):
# read data and call the appropriate handler methods on self._handler
        (..)

The user initializes a Client object, passing a handler to the constructor. The handler is an instance of a class that contains event handler methods implemented by the user. (The expected interface of a handler is defined in an abstract base class.)
Afterwards the user calls run() on the client to start processing.

Problem:
So far this works, but only for applications that solely react to events from the network. Now I want to be able to use this library for network communication in interactive applications (command line or GUI), too. In this case it needs to be able to respond to user input, which must be somehow incorporated in the event loop. GUI libraries like PyQt even provide their own event loop.

Questions:
So how do I integrate those aspects in my library?
Is asyncio the right choice?
Or does my whole approach goes in the wrong direction?

I would greatly appreciate any help and suggestions,

Tobias

PS:
I posted this question to the tutor mailing list [2] but looks like python-list is a better place for it.

[1] The network protocol is IRC (Internet Relay Chat) but I think that does not really matter here.
[2] https://mail.python.org/pipermail/tutor/2013-December/099089.html
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