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atq

atq is a pure-Python asynchronous task queue built to work with asyncio. It is designed to run costly functions outside main event loop using distributed workers.

atq requires Python 3.5+ and is distributed under BSD license.

Usage

First, you should start workers on the servers you plan to use for task execution

atqserver --host <hostname> --port <port-number> --worker <num-workers>

where

  • <hostname> is a hostname of the server
  • <port-number> is a port that server will listen on
  • <num-workers> is a number of worker processes

Please note that code of tasks should be accessible by atq, so it's advised to run atq server from your project root directory in more complex situations.

Then you will need to create a client using hostnames and ports of initialized servers:

import atq

q = atq.Q([
     ("localhost", 12345),
 ])

Finally you can use atq in your code:

import atq
import asyncio
import requests
from collections import ChainMap
from collections import Counter

URLS = [
    ...
]

q = atq.Q([
    ("localhost", 12345),
])

def top_words(url, n):
    """Returns top n words from text specified by url."""
    text = requests.get(url).text.split()
    return {url: Counter(text).most_common(n)}

async def get_top_words(urls, n):
    """Returns top n words in documents specified by URLs."""
    tops_in_url = await asyncio.gather(
        *[q.q(top_words, url, n) for url in urls])
    return ChainMap(*tops_in_url)

top = asyncio.get_event_loop().run_until_complete(get_top_words(URLS, 10))

You can find more examples in examples subdirectory.

Installation

pip3 install atq

Testing

python3 setup.py test

License

BSD


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