Lightweight and beneficial Dependency Injection plugin for apscheduler

Last update: Dec 07, 2022

Overview

Implementation of dependency injection for `apscheduler`

Prerequisites:

apscheduler-di solves the problem since apscheduler doesn't support Dependency Injection natively, and it's real problem for developers to pass on complicated objects to jobs without corruptions

Features:

Supports type hints (PEP 561)
Extend apscheduler and provide handy aliases for events(such as on_startup, on_shutdown and etc)
Provide an opportunity to implement Dependency Inversion SOLID principle

"Under the hood" apscheduler-di just implements Decorator pattern and wraps up the work of native BaseScheduler using rodi lib

Quick example:

import os
from typing import Dict

from apscheduler.jobstores.redis import RedisJobStore
from apscheduler.schedulers.blocking import BlockingScheduler

from apscheduler_di import ContextSchedulerDecorator

# pip install redis
job_defaults: Dict[str, RedisJobStore] = {
    "default": RedisJobStore(
        jobs_key="dispatched_trips_jobs", run_times_key="dispatched_trips_running"
    )
}
job_stores: Dict[str, RedisJobStore] = {
    "default": RedisJobStore(
        jobs_key="dispatched_trips_jobs", run_times_key="dispatched_trips_running"
    )
}


class Tack:

    def tack(self):
        print("Tack!")


def tick(tack: Tack):
    print(tack)


def main():
    scheduler = ContextSchedulerDecorator(BlockingScheduler(jobstores=job_stores,
                                                            job_defaults=job_defaults))
    scheduler.ctx.add_instance(Tack(), Tack)
    scheduler.add_executor('processpool')
    scheduler.add_job(tick, 'interval', seconds=3)
    print('Press Ctrl+{0} to exit'.format('Break' if os.name == 'nt' else 'C'))

    try:
        scheduler.start()
    except (KeyboardInterrupt, SystemExit):
        pass


if __name__ == '__main__':
    main()

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Comments

AsyncIOScheduler shutdown and wakeup fix

Removed unnecessary code, because methods shutdown and wakeup of class AsyncIOScheduler are covered by @run_in_event_loop decorator by itself. Existing code causes this error on shutdown event when stopping runtime by hitting Ctrl+C (KeyboardInterrupt):

TypeError: AsyncIOScheduler.shutdown() missing 1 required positional argument: 'self'

By this fix this error no more occures.

MRE:

import asyncio
import datetime

from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.triggers.date import DateTrigger
from apscheduler_di import ContextSchedulerDecorator


async def job():
    counter = 0
    while True:
        print(f'Counter: {counter}')
        counter += 1
        await asyncio.sleep(1)


async def main():
    scheduler = ContextSchedulerDecorator(AsyncIOScheduler())

    scheduler.add_job(job, DateTrigger(datetime.datetime.now() + datetime.timedelta(seconds=10)))
    scheduler.start()
    try:
        await asyncio.Future()
    finally:
        scheduler.shutdown(wait=True)


if __name__ == '__main__':
    asyncio.run(main())

bug

opened by corruptmane 1

Releases(0.0.7)

0.0.7(Nov 7, 2022)
What's Changed

AsyncIOScheduler shutdown and wakeup fix by @corruptmane in https://github.com/GLEF1X/apscheduler-di/pull/3

New Contributors

@corruptmane made their first contribution in https://github.com/GLEF1X/apscheduler-di/pull/3

Full Changelog: https://github.com/GLEF1X/apscheduler-di/compare/0.0.6...0.0.7
Source code(tar.gz)
Source code(zip)
0.0.6(Jul 27, 2022)

Source code(tar.gz)
Source code(zip)
0.0.5(Jul 20, 2022)
format code using black, isort and pre-commit tools

add more specificity to error message of UnableToResolveDependencyError

Source code(tar.gz)
Source code(zip)
0.0.4(Feb 22, 2022)
Starting from 0.0.4 you can pass on additional kwargs to the job just like above:

async def your_task(repository: Repository, user_id: int): ... scheduler.add_job(your_task, ..., kwargs={"user_id": 435345})

Internal API changes

Source code(tar.gz)
Source code(zip)
0.0.3(Jan 14, 2022)

Minor bugfixes
Source code(tar.gz)
Source code(zip)
0.0.2(Nov 11, 2021)

Source code(tar.gz)
Source code(zip)
0.0.1(Nov 10, 2021)

Source code(tar.gz)
Source code(zip)

Owner

Glib

Junior python backend developer

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