acron 0.1.5

Lightweight scheduler

Lightweight scheduler for python asyncio

Based on croniter to support the crontab syntax.

Installation

Installing acron.

$ pip install acron

Usage

To get started you need a scheduler and at least one job. The Scheduler class can be used as async context manager. Call scheduler.wait() to keep it running forever. To submit jobs call scheduler.update_jobs(jobs) with the complete set of jobs.

Running a simple example running a function every hour…

import asyncio

from acron.scheduler import Scheduler, Job

async def do_the_thing():
    print("Doing the thing")

async def run_jobs_forever():
    do_thing = Job(
        name="Do the thing",
        schedule="0/1 * * * *",
        func=do_the_thing,
    )

    async with Scheduler() as scheduler:
        await scheduler.update_jobs({do_thing})
        await scheduler.wait()

if __name__ == "__main__":
    try:
        asyncio.run(run_jobs_forever())
    except KeyboardInterrupt:
        print("Bye.")

Local development

The project uses poetry to run the test, the linter and to build the artifacts.

The easiest way to start working on acron is to use docker with the dockerfile included in the repository (manual usage of poetry is explained here: https://python-poetry.org/docs/ ).

To use docker, first generate the docker image. Run this command from the top level directory in the repository:

docker build -t acron-builder -f docker/Dockerfile .

Now you can use it to build or run the linter/tests:

$ alias acron-builder="docker run --rm -it -v $PWD/dist:/build/dist acron-builder"

$ acron-builder run pytest tests
=============================================================================================== test session starts ================================================================================================
platform linux -- Python 3.9.7, pytest-5.4.3, py-1.10.0, pluggy-0.13.1
rootdir: /build
plugins: asyncio-0.15.1
collected 4 items
tests/test_acron.py ....                                                                                                                                                                                     [100%]
================================================================================================ 4 passed in 0.04s =================================================================================================

$ acron-builder build
Building acron (0.1.0)
  - Building sdist
  - Built acron-0.1.0.tar.gz
  - Building wheel
  - Built acron-0.1.0-py3-none-any.whl

$ ls dist
acron-0.1.0-py3-none-any.whl  acron-0.1.0.tar.gz