在使用aiohttp結(jié)合apscheduler的AsyncIOScheduler模擬定點(diǎn)并發(fā)的時(shí)候遇到兩個(gè)問(wèn)題
- 在調(diào)度器scheduler.start()后，程序直接退出（在Jupiter中任務(wù)可以正常啟動(dòng)）
- 如何在指定時(shí)間調(diào)用scheduler.shutdown()? (因?yàn)槌绦蛑苯油顺隽耍?/li>
原調(diào)試代碼如下：
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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個(gè)任務(wù) job = scheduler.add_job(main, 'date', run_date=datetime.now() + timedelta(seconds=10)) scheduler.start() |
Google后發(fā)現(xiàn)AsyncIOScheduler的使用需要在scheduler啟動(dòng)后，需要自己調(diào)用asyncio.get_event_loop().run_forever()來(lái)啟動(dòng)協(xié)程任務(wù)。
但是一旦run_forever()則就會(huì)阻塞至死。除非有KeyboardInterrupt, SystemExit等異常或者強(qiáng)殺來(lái)停止其運(yùn)行。
此時(shí)想到使用Python的signal來(lái)定時(shí)發(fā)送信號(hào)，修改后程序如下，可以正常延遲停止（感覺(jué)有點(diǎn)像模擬Go的defer)。
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# -*- 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個(gè)任務(wù) job = scheduler.add_job(main, 'date', run_date=datetime.now() + timedelta(seconds=10)) scheduler.start() signal.alarm(20) # 20秒后終止程序 asyncio.get_event_loop().run_forever() # 永遠(yuǎn)運(yùn)行 |
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原文鏈接：https://www.cnblogs.com/superhin/p/15060818.html
