APscheduler不会停止

问题描述 投票:0回答:3

我正在为一个网站开发 python 代码,该代码除其他外,还创建一个 excel 工作表,然后将其转换为 json 文件。我需要这段代码持续运行,除非它被网站管理员杀死。

为此,我使用APscheduler。

代码在没有 APscheduler 的情况下可以完美运行,但是当我尝试添加代码的其余部分时,会发生以下两种情况之一: 1)它会永远运行,尽管使用“ctrl+C”也不会停止,我需要使用任务管理器停止它,或者2)它只运行一次,然后就停止了

不停歇的代码:

from apscheduler.scheduler import Scheduler
import logging
import time

logging.basicConfig()
sched = Scheduler()
sched.start()

(...)
code to make excel sheet and json file
(...)

@sched.interval_schedule(seconds = 15)
def job():
    excelapi_final()

while True:
    time.sleep(10)
sched.shutdown(wait=False)

一次后停止运行的代码:

from apscheduler.scheduler import Scheduler
import logging
import time

logging.basicConfig()
sched = Scheduler()

(...)
#create excel sheet and json file
(...)

@sched.interval_schedule(seconds = 15)
def job():
    excelapi_final()
sched.start()

while True:
    time.sleep(10)
    sched.shutdown(wait=False)

我从其他问题、一些教程和文档中了解到

sched.shutdown
应该允许通过 ctrl+C 杀死代码 - 但这不起作用。有任何想法吗?预先感谢!

python python-2.7 application-shutdown apscheduler
3个回答
3
投票

您可以使用独立模式:

sched = Scheduler(standalone=True)

然后像这样启动调度程序:

try:
    sched.start()
except (KeyboardInterrupt):
    logger.debug('Got SIGTERM! Terminating...')

您更正后的代码应如下所示:

from apscheduler.scheduler import Scheduler
import logging
import time

logging.basicConfig()
sched = Scheduler(standalone=True)

(...)
code to make excel sheet and json file
(...)

@sched.interval_schedule(seconds = 15)
def job():
    excelapi_final()

try:
    sched.start()
except (KeyboardInterrupt):
    logger.debug('Got SIGTERM! Terminating...')

这样当按下 Ctrl-C 时程序就会停止


1
投票

你可以优雅地关闭它:

import signal
from apscheduler.scheduler import Scheduler
import logging
import time

logging.basicConfig()
sched = Scheduler()

(...)
#create excel sheet and json file
(...)

@sched.interval_schedule(seconds = 15)
def job():
    excelapi_final()

sched.start()

def gracefully_exit(signum, frame):
    print('Stopping...')
    sched.shutdown()

signal.signal(signal.SIGINT, gracefully_exit)
signal.signal(signal.SIGTERM, gracefully_exit)

0
投票

我尝试了第一个答案,我的代码排列如下:


class APSchedulerBase:
    def __init__(self, scheduler: Any = None, add_listener: bool = True):
        if scheduler is None:
            self.sched = BlockingScheduler()
            if add_listener:
                self.sched.add_listener(self.ap_listener, EVENT_JOB_ERROR | EVENT_JOB_EXECUTED)
        else:
            self.sched = scheduler

    def ap_listener(self, event):
        if event.exception == KeyboardInterrupt or event.exception == SystemExit:
            self.on_kill()
        if event.exception:
            logger.critical(str(traceback.format_exc()))
        else:
            pass

    def on_kill(self, sig=None, frame=None):
        logger.warning("Scheduler Exit.")
        self.sched.shutdown(wait=False)

    def register_task(
            self, func: Callable, trigger: str,
            **kwargs
    ):
        @sched_job(
            self.sched,
            logger,
            trigger=trigger,
            **kwargs
        )
        def wrap():
            func()
        wrap()

    def start(self):
        try:
            logger.warning("Scheduler Start.")
            self.sched.start()
        except (KeyboardInterrupt, SystemExit):
            self.on_kill()

但是当进程等待 cron 作业执行时,我无法使用 ctrl+c 杀死该进程。好像kill信号只有在job即将执行的时候才能传达?

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