在使用aiohttp结合apscheduler的AsyncIOScheduler模拟定点并发的时候遇到两个问题
- 在调度器scheduler.start()后,程序直接退出(在Jupiter中任务可以正常启动)
- 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:
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from datetime import datetime, timedelta import aiohttp from apscheduler.schedulers.asyncio import AsyncIOScheduler from apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStore async 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)。
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# -*- coding: utf-8 -*- """ @Time : 2021/7/23 @Auth : hanzhichao @Desc: """ from datetime import datetime, timedelta import signal import asyncio import aiohttp from apscheduler.schedulers.asyncio import AsyncIOScheduler from apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStore async 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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原文链接:https://www.cnblogs.com/superhin/p/15060818.html