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توضیحات

A simple event loop using asyncio

ویژگی	مقدار
سیستم عامل	-
نام فایل	aiowire-2.1.1
نام	aiowire
نسخه کتابخانه	2.1.1
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	David M. Rogers
ایمیل نویسنده	predictivestatmech@gmail.com
آدرس صفحه اصلی	https://github.com/frobnitzem/aiowire
آدرس اینترنتی	https://pypi.org/project/aiowire/
مجوز	LGPL-3.0-or-later

aiowire - A simple event loop using asyncio ============================================ This package implements a ``EventLoop`` class that manages concurrent coroutines. It is based on the principles of functional reactive programming and draws inspiration from Haskell's `Control.Wire <https://hackage.haskell.org/package/netwire-4.0.7/docs/Control-Wire.html>`_ library. In particular, every co-routine started by the event loop is a ``Wire``. ``Wire``-s either return ``None``, indicating they're done, or another ``Wire``. An example helps explain the idea:: from aiowire import EventLoop event = 0 async def show_event(ev) \ -> Optional[Callable[[EventLoop],Awaitable]]: print("Running...") event += 1 await asyncio.sleep(event*0.15) print(f"Event {event}") if event < 5: return show_event async with EventLoop(timeout=1) as event: event.start(show_event) event.start(show_event) We start up an event loop and drop in two wires. Each runs, then returns the ``show_event`` function. The event loop runs those functions next... and so on. But this isn't functional programming. The wires have access to the event loop, and can start more tasks. Easy, right? What can I do with it? ^^^^^^^^^^^^^^^^^^^^^^ What if you have a server that's spawning programs, working with sockets, and managing timeouts? Drop in one wire for each program, one polling on socket I/O, and another acting as a timer (as above). The canonical task types are thus:: asyncio.create_subprocess_exec # run a process asyncio.sleep # awake the loop after a given time lapse zmq.asyncio.Poller.poll # awake the loop after I/O on socket/file # Note: see aiowire.Poller for a Wire-y interface. Now your sockets can launch programs, and your program results can start/stop sockets, and everyone can start background tasks. Poller? ^^^^^^^ The ``Poller`` class lets you schedule callbacks in response to socket or file-descriptor activity. Of course, the callbacks are wires, and run concurrently. Poller is also a Wire, created as, `Poller(dictionary mapping sockets / fd-s to callback wires)`. You add it to your event loop as usual:: # ... create sock from zmq.asyncio.Context async def echo(ev): await sock.send( await sock.recv() ) todo = { 0: Call(print, "received input on sys.stdin"), sock: echo } async with EventLoop() as ev: ev.start( Poller(todo) ) Tell me more ^^^^^^^^^^^^ Yes, you *could* just send async functions taking one argument to ``EventLoop.start``, but where's the fun in writing closures everywhere? To take it to the next level, aiowire comes with a ``Wire`` convenience class that lets you write ``Wire``-s expressively. The following class extensions help you make Wire-s out of common programming idioms: * `Wire(w)`: acts like an identity over "async func(ev):" functions * `Repeat(w, n)`: repeat wire ``w`` n times in a row * `Forever(w)`: repeat forever -- like `Repeat(w) * infinity` * `Call(fn, *args)`: call fn (normal or async), ignore the return, and exit Consider, for example, printing 4 alarms separated by some time interval:: from aiowire import EventLoop, Call prog = ( Call(asyncio.sleep, 0.1) >> Call(print, 'beep\a') ) * 4 async with EventLoop() as ev: ev.start(prog) References ========== * https://pyzmq.readthedocs.io/en/latest/api/zmq.html#poller * https://pythontic.com/modules/select/poll * https://blog.tomecek.net/post/non-blocking-stdin-in-python/

نیازمندی

مقدار	نام
>=22.3.0,<23.0.0	pyzmq

زبان مورد نیاز

مقدار	نام
>=3.8	Python

نحوه نصب

نصب پکیج whl aiowire-2.1.1:

pip install aiowire-2.1.1.whl

نصب پکیج tar.gz aiowire-2.1.1:

pip install aiowire-2.1.1.tar.gz