kewkew

A tiny queue library leveraging asyncio for background tasks or scripting

Install

You can install kewkew via pip.

python -m pip install kewkew

You can also download the kewkew/kew.py source from this repo. There are no external dependencies to worry about.

Usage

The Kew class is meant to be a parent class. At a minimum, the child class needs to implement an async worker method which must do two things:

• Take a single argument that accepts data from the queue
• Returns a boolean if the data was processed successfully and can be removed from the queue

Here is a minimum viable implementation.

from kewkew import Kew

class MyKew(Kew):
    async def worker(self, data) -> bool:
        print(data)
        return True

We then have two main ways of using the queue. Kew provides both sync and async methods to add items to the queue and tell the queue to finish processing (for a graceful shutdown).

This first example uses the sync calls so everything can be run in an interactive environment.

from mykew import MyKew

kew = MyKew()
for i in range(100):
    kew.add_sync(i)
kew.finish_sync()

This second example uses the async calls within a coroutine.

import asyncio as aio

async def main():
    kew = MyKew()
    for i in range(100):
        await kew.add(i)
    await kew.finish()

aio.run(main)

You can see this and an async database processing example in the examples folder.

Debug

Python Queues have a tendency to swallow runtime exceptions. You can debug your worker more easily by calling it directly.

import asyncio as aio
from mykew import MyKew

kew = MyKew()
aio.run(kew.worker(1))