Python使用signal定时结束AsyncIOScheduler任务的问题

【Python使用signal定时结束AsyncIOScheduler任务的问题】在使用aiohttp结合apscheduler的AsyncIOScheduler模拟定点并发的时候遇到两个问题

  1. 在调度器scheduler.start()后,程序直接退出(在Jupiter中任务可以正常启动)
  2. 如何在指定时间调用scheduler.shutdown()? (因为程序直接退出了)
原调试代码如下:
from datetime import datetime, timedeltaimport aiohttpfrom apscheduler.schedulers.asyncio import AsyncIOSchedulerfrom apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStoreasync def get(session):url = 'https://httpbin.org/get?a=1'async with session.get(url) as res:print('get', res.status)return await res.text()async def post(session):url = 'https://httpbin.org/post?b=2'async with session.post(url) as res:print('post', res.status)return await res.text()async def main():async with aiohttp.ClientSession() as session:await get(session)await post(session)if __name__ == '__main__':jobstores = {'default': SQLAlchemyJobStore(url='sqlite:///jobs.sqlite')}scheduler = AsyncIOScheduler(jobstores=jobstores)for i in range(10):# 添加10个任务job = scheduler.add_job(main, 'date', run_date=datetime.now() + timedelta(seconds=10))scheduler.start()

Google后发现AsyncIOScheduler的使用需要在scheduler启动后,需要自己调用asyncio.get_event_loop().run_forever()来启动协程任务。
但是一旦run_forever()则就会阻塞至死。除非有KeyboardInterrupt, SystemExit等异常或者强杀来停止其运行。
此时想到使用Python的signal来定时发送信号,修改后程序如下,可以正常延迟停止(感觉有点像模拟Go的defer)。
# -*- coding: utf-8 -*-"""@Time : 2021/7/23@Auth : hanzhichao@Desc:"""from datetime import datetime, timedeltaimport signalimport asyncioimport aiohttpfrom apscheduler.schedulers.asyncio import AsyncIOSchedulerfrom apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStoreasync def get(session):url = 'https://httpbin.org/get?a=1'async with session.get(url) as res:print('get', res.status)return await res.text()async def post(session):url = 'https://httpbin.org/post?b=2'async with session.post(url) as res:print('post', res.status)return await res.text()async def main():async with aiohttp.ClientSession() as session:await get(session)await post(session)if __name__ == '__main__':jobstores = {'default': SQLAlchemyJobStore(url='sqlite:///jobs.sqlite')}scheduler = AsyncIOScheduler(jobstores=jobstores)for i in range(10):# 添加10个任务job = scheduler.add_job(main, 'date', run_date=datetime.now() + timedelta(seconds=10))scheduler.start()signal.alarm(20)# 20秒后终止程序asyncio.get_event_loop().run_forever()# 永远运行

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