aiotools 0.2.0

Idiomatic asyncio utilities

Idiomatic asyncio utilties

Async Context Manager

This is an asynchronous version of `contextlib.contextmanager <https://docs.python.org/3/library/contextlib.html#contextlib.contextmanager>`__ to make it easier to write asynchronous context managers without creating boilerplate classes.

import asyncio
import aiotools

@aiotools.actxmgr
async def mygen(a):
    await asyncio.sleep(1)
    yield a + 1
    await asyncio.sleep(1)

async def somewhere():
    async with mygen(1) as b:
        assert b == 2

Note that you need to wrap yield with a try-finally block to ensure resource releases (e.g., locks), even in the case when an exception is ocurred inside the async-with block.

import asyncio
import aiotools

lock = asyncio.Lock()

@aiotools.actxmgr
async def mygen(a):
    await lock.acquire()
    try:
        yield a + 1
    finally:
        lock.release()

async def somewhere():
    try:
        async with mygen(1) as b:
            raise RuntimeError('oops')
    except RuntimeError:
        print('caught!')  # you can catch exceptions here.

You can also create a group of async context managers, which are entered/exited all at once using asyncio.gather.

import asyncio
import aiotools

@aiotools.actxmgr
async def mygen(a):
    yield a + 10

async def somewhere():
    ctxgrp = aiotools.actxgroup(mygen(i) for i in range(10))
    async with ctxgrp as values:
        assert len(values) == 10
        for i in range(10):
            assert values[i] == i + 10

Async Timer

import aiotools

i = 0

async def mytick(interval):
    print(i)
    i += 1

async def somewhere():
    t = aiotools.create_timer(mytick, 1.0)
    ...
    t.cancel()
    await t

t is an `asyncio.Task <https://docs.python.org/3/library/asyncio-task.html#asyncio.Task>`__ object. To stop the timer, call t.cancel(); await t. Please don’t forget await-ing t because it requires extra steps to cancel and await all pending tasks. To make your timer function to be cancellable, add a try-except clause catching asyncio.CancelledError since we use it as a termination signal.

You may add TimerDelayPolicy argument to control the behavior when the timer-fired task takes longer than the timer interval. DEFAULT is to accumulate them and cancel all the remainings at once when the timer is cancelled. CANCEL is to cancel any pending previously fired tasks on every interval.

import asyncio
import aiotools

async def mytick(interval):
    await asyncio.sleep(100)  # cancelled on every next interval.

async def somewhere():
    t = aiotools.create_timer(mytick, 1.0, aiotools.TimerDelayPolicy.CANCEL)
    ...
    t.cancel()
    await t