Lightweight and beneficial Dependency Injection plugin for apscheduler

Related tags

Security related resources scheduler dependency-injection asyncio apscheduler scheduler-library
Overview

Implementation of dependency injection for apscheduler

PyPI versioncodecovDownloads

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

    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)
Owner
Glib
Junior python backend developer
Glib
GitHub
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