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calibre-web/cps/services/background_scheduler.py
2023-01-29 09:54:07 +01:00

85 lines
3.1 KiB
Python

# -*- 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/>.
import atexit
from .. import logger
from .worker import WorkerThread
try:
from apscheduler.schedulers.background import BackgroundScheduler as BScheduler
from apscheduler.triggers.cron import CronTrigger
from apscheduler.triggers.date import DateTrigger
use_APScheduler = True
except (ImportError, RuntimeError) as e:
use_APScheduler = False
log = logger.create()
log.info('APScheduler not found. Unable to schedule tasks.')
class BackgroundScheduler:
_instance = None
def __new__(cls):
if not use_APScheduler:
return False
if cls._instance is None:
cls._instance = super(BackgroundScheduler, cls).__new__(cls)
cls.log = logger.create()
cls.scheduler = BScheduler()
cls.scheduler.start()
return cls._instance
def schedule(self, func, trigger, name=None):
if use_APScheduler:
return self.scheduler.add_job(func=func, trigger=trigger, name=name)
# Expects a lambda expression for the task
def schedule_task(self, task, user=None, name=None, hidden=False, trigger=None):
if use_APScheduler:
def scheduled_task():
worker_task = task()
worker_task.scheduled = True
WorkerThread.add(user, worker_task, hidden=hidden)
return self.schedule(func=scheduled_task, trigger=trigger, name=name)
# Expects a list of lambda expressions for the tasks
def schedule_tasks(self, tasks, user=None, trigger=None):
if use_APScheduler:
for task in tasks:
self.schedule_task(task[0], user=user, trigger=trigger, name=task[1], hidden=task[2])
# Expects a lambda expression for the task
def schedule_task_immediately(self, task, user=None, name=None, hidden=False):
if use_APScheduler:
def immediate_task():
WorkerThread.add(user, task(), hidden)
return self.schedule(func=immediate_task, trigger=DateTrigger(), name=name)
# Expects a list of lambda expressions for the tasks
def schedule_tasks_immediately(self, tasks, user=None):
if use_APScheduler:
for task in tasks:
self.schedule_task_immediately(task[0], user, name="immediately " + task[1], hidden=task[2])
# Remove all jobs
def remove_all_jobs(self):
self.scheduler.remove_all_jobs()