calibre-web/cps/services/background_scheduler.py

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# -*- coding: utf-8 -*-
# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
# Copyright (C) 2020 mmonkey
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import division, print_function, unicode_literals
import atexit
from .. import logger
from .worker import WorkerThread
from apscheduler.schedulers.background import BackgroundScheduler as BScheduler
class BackgroundScheduler:
_instance = None
def __new__(cls):
if cls._instance is None:
cls._instance = super(BackgroundScheduler, cls).__new__(cls)
scheduler = BScheduler()
atexit.register(lambda: scheduler.shutdown())
cls.log = logger.create()
cls.scheduler = scheduler
cls.scheduler.start()
return cls._instance
def add(self, func, trigger, **trigger_args):
self.scheduler.add_job(func=func, trigger=trigger, **trigger_args)
def add_task(self, user, task, trigger, **trigger_args):
def scheduled_task():
worker_task = task()
self.log.info('Running scheduled task in background: ' + worker_task.name + ': ' + worker_task.message)
WorkerThread.add(user, worker_task)
self.add(func=scheduled_task, trigger=trigger, **trigger_args)