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asyncio task pool
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import asyncio | |
from asyncio.queues import Queue | |
TERMINATOR = object() | |
class TaskPool(object): | |
def __init__(self, loop, num_workers): | |
self.loop = loop | |
self.tasks = Queue(loop=self.loop) | |
self.workers = [] | |
for _ in range(num_workers): | |
worker = asyncio.ensure_future(self.worker(), loop=self.loop) | |
self.workers.append(worker) | |
async def worker(self): | |
while True: | |
future, task = await self.tasks.get() | |
if task is TERMINATOR: | |
break | |
result = await asyncio.wait_for(task, None, loop=self.loop) | |
future.set_result(result) | |
def submit(self, task): | |
future = asyncio.Future(loop=self.loop) | |
self.tasks.put_nowait((future, task)) | |
return future | |
async def join(self): | |
for _ in self.workers: | |
self.tasks.put_nowait((None, TERMINATOR)) | |
await asyncio.gather(*self.workers, loop=self.loop) | |
async def do_stuff(): | |
pass | |
pool = TaskPool(asyncio.get_event_loop(), 4) | |
futures = [pool.submit(do_stuff()) for _ in range(10)] | |
await pool.join() |
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