mirror of https://github.com/evilhero/mylar
560 lines
21 KiB
Python
560 lines
21 KiB
Python
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"""
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This module is the main part of the library. It houses the Scheduler class
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and related exceptions.
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"""
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from threading import Thread, Event, Lock
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from datetime import datetime, timedelta
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from logging import getLogger
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import os
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import sys
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from lib.apscheduler.util import *
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from lib.apscheduler.triggers import SimpleTrigger, IntervalTrigger, CronTrigger
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from lib.apscheduler.jobstores.ram_store import RAMJobStore
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from lib.apscheduler.job import Job, MaxInstancesReachedError
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from lib.apscheduler.events import *
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from lib.apscheduler.threadpool import ThreadPool
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logger = getLogger(__name__)
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class SchedulerAlreadyRunningError(Exception):
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"""
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Raised when attempting to start or configure the scheduler when it's
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already running.
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"""
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def __str__(self):
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return 'Scheduler is already running'
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class Scheduler(object):
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"""
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This class is responsible for scheduling jobs and triggering
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their execution.
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"""
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_stopped = False
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_thread = None
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def __init__(self, gconfig={}, **options):
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self._wakeup = Event()
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self._jobstores = {}
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self._jobstores_lock = Lock()
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self._listeners = []
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self._listeners_lock = Lock()
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self._pending_jobs = []
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self.configure(gconfig, **options)
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def configure(self, gconfig={}, **options):
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"""
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Reconfigures the scheduler with the given options. Can only be done
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when the scheduler isn't running.
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"""
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if self.running:
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raise SchedulerAlreadyRunningError
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# Set general options
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config = combine_opts(gconfig, 'apscheduler.', options)
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self.misfire_grace_time = int(config.pop('misfire_grace_time', 1))
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self.coalesce = asbool(config.pop('coalesce', True))
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self.daemonic = asbool(config.pop('daemonic', True))
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# Configure the thread pool
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if 'threadpool' in config:
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self._threadpool = maybe_ref(config['threadpool'])
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else:
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threadpool_opts = combine_opts(config, 'threadpool.')
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self._threadpool = ThreadPool(**threadpool_opts)
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# Configure job stores
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jobstore_opts = combine_opts(config, 'jobstore.')
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jobstores = {}
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for key, value in jobstore_opts.items():
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store_name, option = key.split('.', 1)
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opts_dict = jobstores.setdefault(store_name, {})
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opts_dict[option] = value
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for alias, opts in jobstores.items():
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classname = opts.pop('class')
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cls = maybe_ref(classname)
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jobstore = cls(**opts)
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self.add_jobstore(jobstore, alias, True)
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def start(self):
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"""
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Starts the scheduler in a new thread.
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"""
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if self.running:
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raise SchedulerAlreadyRunningError
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# Create a RAMJobStore as the default if there is no default job store
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if not 'default' in self._jobstores:
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self.add_jobstore(RAMJobStore(), 'default', True)
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# Schedule all pending jobs
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for job, jobstore in self._pending_jobs:
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self._real_add_job(job, jobstore, False)
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del self._pending_jobs[:]
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self._stopped = False
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self._thread = Thread(target=self._main_loop, name='APScheduler')
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self._thread.setDaemon(self.daemonic)
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self._thread.start()
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def shutdown(self, wait=True, shutdown_threadpool=True):
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"""
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Shuts down the scheduler and terminates the thread.
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Does not interrupt any currently running jobs.
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:param wait: ``True`` to wait until all currently executing jobs have
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finished (if ``shutdown_threadpool`` is also ``True``)
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:param shutdown_threadpool: ``True`` to shut down the thread pool
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"""
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if not self.running:
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return
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self._stopped = True
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self._wakeup.set()
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# Shut down the thread pool
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if shutdown_threadpool:
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self._threadpool.shutdown(wait)
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# Wait until the scheduler thread terminates
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self._thread.join()
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@property
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def running(self):
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return not self._stopped and self._thread and self._thread.isAlive()
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def add_jobstore(self, jobstore, alias, quiet=False):
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"""
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Adds a job store to this scheduler.
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:param jobstore: job store to be added
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:param alias: alias for the job store
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:param quiet: True to suppress scheduler thread wakeup
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:type jobstore: instance of
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:class:`~apscheduler.jobstores.base.JobStore`
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:type alias: str
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"""
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self._jobstores_lock.acquire()
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try:
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if alias in self._jobstores:
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raise KeyError('Alias "%s" is already in use' % alias)
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self._jobstores[alias] = jobstore
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jobstore.load_jobs()
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finally:
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self._jobstores_lock.release()
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# Notify listeners that a new job store has been added
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self._notify_listeners(JobStoreEvent(EVENT_JOBSTORE_ADDED, alias))
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# Notify the scheduler so it can scan the new job store for jobs
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if not quiet:
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self._wakeup.set()
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def remove_jobstore(self, alias):
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"""
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Removes the job store by the given alias from this scheduler.
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:type alias: str
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"""
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self._jobstores_lock.acquire()
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try:
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try:
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del self._jobstores[alias]
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except KeyError:
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raise KeyError('No such job store: %s' % alias)
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finally:
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self._jobstores_lock.release()
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# Notify listeners that a job store has been removed
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self._notify_listeners(JobStoreEvent(EVENT_JOBSTORE_REMOVED, alias))
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def add_listener(self, callback, mask=EVENT_ALL):
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"""
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Adds a listener for scheduler events. When a matching event occurs,
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``callback`` is executed with the event object as its sole argument.
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If the ``mask`` parameter is not provided, the callback will receive
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events of all types.
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:param callback: any callable that takes one argument
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:param mask: bitmask that indicates which events should be listened to
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"""
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self._listeners_lock.acquire()
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try:
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self._listeners.append((callback, mask))
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finally:
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self._listeners_lock.release()
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def remove_listener(self, callback):
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"""
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Removes a previously added event listener.
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"""
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self._listeners_lock.acquire()
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try:
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for i, (cb, _) in enumerate(self._listeners):
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if callback == cb:
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del self._listeners[i]
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finally:
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self._listeners_lock.release()
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def _notify_listeners(self, event):
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self._listeners_lock.acquire()
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try:
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listeners = tuple(self._listeners)
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finally:
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self._listeners_lock.release()
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for cb, mask in listeners:
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if event.code & mask:
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try:
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cb(event)
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except:
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logger.exception('Error notifying listener')
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def _real_add_job(self, job, jobstore, wakeup):
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job.compute_next_run_time(datetime.now())
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if not job.next_run_time:
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raise ValueError('Not adding job since it would never be run')
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self._jobstores_lock.acquire()
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try:
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try:
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store = self._jobstores[jobstore]
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except KeyError:
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raise KeyError('No such job store: %s' % jobstore)
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store.add_job(job)
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finally:
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self._jobstores_lock.release()
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# Notify listeners that a new job has been added
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event = JobStoreEvent(EVENT_JOBSTORE_JOB_ADDED, jobstore, job)
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self._notify_listeners(event)
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logger.info('Added job "%s" to job store "%s"', job, jobstore)
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# Notify the scheduler about the new job
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if wakeup:
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self._wakeup.set()
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def add_job(self, trigger, func, args, kwargs, jobstore='default',
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**options):
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"""
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Adds the given job to the job list and notifies the scheduler thread.
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:param trigger: alias of the job store to store the job in
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:param func: callable to run at the given time
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:param args: list of positional arguments to call func with
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:param kwargs: dict of keyword arguments to call func with
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:param jobstore: alias of the job store to store the job in
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:rtype: :class:`~apscheduler.job.Job`
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"""
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job = Job(trigger, func, args or [], kwargs or {},
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options.pop('misfire_grace_time', self.misfire_grace_time),
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options.pop('coalesce', self.coalesce), **options)
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if not self.running:
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self._pending_jobs.append((job, jobstore))
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logger.info('Adding job tentatively -- it will be properly '
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'scheduled when the scheduler starts')
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else:
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self._real_add_job(job, jobstore, True)
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return job
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def _remove_job(self, job, alias, jobstore):
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jobstore.remove_job(job)
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# Notify listeners that a job has been removed
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event = JobStoreEvent(EVENT_JOBSTORE_JOB_REMOVED, alias, job)
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self._notify_listeners(event)
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logger.info('Removed job "%s"', job)
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def add_date_job(self, func, date, args=None, kwargs=None, **options):
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"""
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Schedules a job to be completed on a specific date and time.
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:param func: callable to run at the given time
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:param date: the date/time to run the job at
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:param name: name of the job
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:param jobstore: stored the job in the named (or given) job store
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:param misfire_grace_time: seconds after the designated run time that
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the job is still allowed to be run
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:type date: :class:`datetime.date`
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:rtype: :class:`~apscheduler.job.Job`
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"""
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trigger = SimpleTrigger(date)
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return self.add_job(trigger, func, args, kwargs, **options)
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def add_interval_job(self, func, weeks=0, days=0, hours=0, minutes=0,
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seconds=0, start_date=None, args=None, kwargs=None,
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**options):
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"""
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Schedules a job to be completed on specified intervals.
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:param func: callable to run
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:param weeks: number of weeks to wait
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:param days: number of days to wait
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:param hours: number of hours to wait
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:param minutes: number of minutes to wait
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:param seconds: number of seconds to wait
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:param start_date: when to first execute the job and start the
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counter (default is after the given interval)
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:param args: list of positional arguments to call func with
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:param kwargs: dict of keyword arguments to call func with
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:param name: name of the job
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:param jobstore: alias of the job store to add the job to
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:param misfire_grace_time: seconds after the designated run time that
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the job is still allowed to be run
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:rtype: :class:`~apscheduler.job.Job`
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"""
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interval = timedelta(weeks=weeks, days=days, hours=hours,
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minutes=minutes, seconds=seconds)
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trigger = IntervalTrigger(interval, start_date)
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return self.add_job(trigger, func, args, kwargs, **options)
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def add_cron_job(self, func, year='*', month='*', day='*', week='*',
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day_of_week='*', hour='*', minute='*', second='*',
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start_date=None, args=None, kwargs=None, **options):
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"""
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Schedules a job to be completed on times that match the given
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expressions.
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:param func: callable to run
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:param year: year to run on
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:param month: month to run on (0 = January)
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:param day: day of month to run on
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:param week: week of the year to run on
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:param day_of_week: weekday to run on (0 = Monday)
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:param hour: hour to run on
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:param second: second to run on
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:param args: list of positional arguments to call func with
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:param kwargs: dict of keyword arguments to call func with
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:param name: name of the job
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:param jobstore: alias of the job store to add the job to
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:param misfire_grace_time: seconds after the designated run time that
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the job is still allowed to be run
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:return: the scheduled job
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:rtype: :class:`~apscheduler.job.Job`
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"""
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trigger = CronTrigger(year=year, month=month, day=day, week=week,
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day_of_week=day_of_week, hour=hour,
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minute=minute, second=second,
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start_date=start_date)
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return self.add_job(trigger, func, args, kwargs, **options)
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def cron_schedule(self, **options):
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"""
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Decorator version of :meth:`add_cron_job`.
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This decorator does not wrap its host function.
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Unscheduling decorated functions is possible by passing the ``job``
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attribute of the scheduled function to :meth:`unschedule_job`.
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"""
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def inner(func):
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func.job = self.add_cron_job(func, **options)
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return func
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return inner
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def interval_schedule(self, **options):
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"""
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Decorator version of :meth:`add_interval_job`.
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This decorator does not wrap its host function.
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Unscheduling decorated functions is possible by passing the ``job``
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attribute of the scheduled function to :meth:`unschedule_job`.
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"""
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def inner(func):
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func.job = self.add_interval_job(func, **options)
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return func
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return inner
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def get_jobs(self):
|
||
|
|
"""
|
||
|
|
Returns a list of all scheduled jobs.
|
||
|
|
|
||
|
|
:return: list of :class:`~apscheduler.job.Job` objects
|
||
|
|
"""
|
||
|
|
self._jobstores_lock.acquire()
|
||
|
|
try:
|
||
|
|
jobs = []
|
||
|
|
for jobstore in itervalues(self._jobstores):
|
||
|
|
jobs.extend(jobstore.jobs)
|
||
|
|
return jobs
|
||
|
|
finally:
|
||
|
|
self._jobstores_lock.release()
|
||
|
|
|
||
|
|
def unschedule_job(self, job):
|
||
|
|
"""
|
||
|
|
Removes a job, preventing it from being run any more.
|
||
|
|
"""
|
||
|
|
self._jobstores_lock.acquire()
|
||
|
|
try:
|
||
|
|
for alias, jobstore in iteritems(self._jobstores):
|
||
|
|
if job in list(jobstore.jobs):
|
||
|
|
self._remove_job(job, alias, jobstore)
|
||
|
|
return
|
||
|
|
finally:
|
||
|
|
self._jobstores_lock.release()
|
||
|
|
|
||
|
|
raise KeyError('Job "%s" is not scheduled in any job store' % job)
|
||
|
|
|
||
|
|
def unschedule_func(self, func):
|
||
|
|
"""
|
||
|
|
Removes all jobs that would execute the given function.
|
||
|
|
"""
|
||
|
|
found = False
|
||
|
|
self._jobstores_lock.acquire()
|
||
|
|
try:
|
||
|
|
for alias, jobstore in iteritems(self._jobstores):
|
||
|
|
for job in list(jobstore.jobs):
|
||
|
|
if job.func == func:
|
||
|
|
self._remove_job(job, alias, jobstore)
|
||
|
|
found = True
|
||
|
|
finally:
|
||
|
|
self._jobstores_lock.release()
|
||
|
|
|
||
|
|
if not found:
|
||
|
|
raise KeyError('The given function is not scheduled in this '
|
||
|
|
'scheduler')
|
||
|
|
|
||
|
|
def print_jobs(self, out=None):
|
||
|
|
"""
|
||
|
|
Prints out a textual listing of all jobs currently scheduled on this
|
||
|
|
scheduler.
|
||
|
|
|
||
|
|
:param out: a file-like object to print to (defaults to **sys.stdout**
|
||
|
|
if nothing is given)
|
||
|
|
"""
|
||
|
|
out = out or sys.stdout
|
||
|
|
job_strs = []
|
||
|
|
self._jobstores_lock.acquire()
|
||
|
|
try:
|
||
|
|
for alias, jobstore in iteritems(self._jobstores):
|
||
|
|
job_strs.append('Jobstore %s:' % alias)
|
||
|
|
if jobstore.jobs:
|
||
|
|
for job in jobstore.jobs:
|
||
|
|
job_strs.append(' %s' % job)
|
||
|
|
else:
|
||
|
|
job_strs.append(' No scheduled jobs')
|
||
|
|
finally:
|
||
|
|
self._jobstores_lock.release()
|
||
|
|
|
||
|
|
out.write(os.linesep.join(job_strs))
|
||
|
|
|
||
|
|
def _run_job(self, job, run_times):
|
||
|
|
"""
|
||
|
|
Acts as a harness that runs the actual job code in a thread.
|
||
|
|
"""
|
||
|
|
for run_time in run_times:
|
||
|
|
# See if the job missed its run time window, and handle possible
|
||
|
|
# misfires accordingly
|
||
|
|
difference = datetime.now() - run_time
|
||
|
|
grace_time = timedelta(seconds=job.misfire_grace_time)
|
||
|
|
if difference > grace_time:
|
||
|
|
# Notify listeners about a missed run
|
||
|
|
event = JobEvent(EVENT_JOB_MISSED, job, run_time)
|
||
|
|
self._notify_listeners(event)
|
||
|
|
logger.warning('Run time of job "%s" was missed by %s',
|
||
|
|
job, difference)
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
job.add_instance()
|
||
|
|
except MaxInstancesReachedError:
|
||
|
|
event = JobEvent(EVENT_JOB_MISSED, job, run_time)
|
||
|
|
self._notify_listeners(event)
|
||
|
|
logger.warning('Execution of job "%s" skipped: '
|
||
|
|
'maximum number of running instances '
|
||
|
|
'reached (%d)', job, job.max_instances)
|
||
|
|
break
|
||
|
|
|
||
|
|
logger.info('Running job "%s" (scheduled at %s)', job,
|
||
|
|
run_time)
|
||
|
|
|
||
|
|
try:
|
||
|
|
retval = job.func(*job.args, **job.kwargs)
|
||
|
|
except:
|
||
|
|
# Notify listeners about the exception
|
||
|
|
exc, tb = sys.exc_info()[1:]
|
||
|
|
event = JobEvent(EVENT_JOB_ERROR, job, run_time,
|
||
|
|
exception=exc, traceback=tb)
|
||
|
|
self._notify_listeners(event)
|
||
|
|
|
||
|
|
logger.exception('Job "%s" raised an exception', job)
|
||
|
|
else:
|
||
|
|
# Notify listeners about successful execution
|
||
|
|
event = JobEvent(EVENT_JOB_EXECUTED, job, run_time,
|
||
|
|
retval=retval)
|
||
|
|
self._notify_listeners(event)
|
||
|
|
|
||
|
|
logger.info('Job "%s" executed successfully', job)
|
||
|
|
|
||
|
|
job.remove_instance()
|
||
|
|
|
||
|
|
# If coalescing is enabled, don't attempt any further runs
|
||
|
|
if job.coalesce:
|
||
|
|
break
|
||
|
|
|
||
|
|
def _process_jobs(self, now):
|
||
|
|
"""
|
||
|
|
Iterates through jobs in every jobstore, starts pending jobs
|
||
|
|
and figures out the next wakeup time.
|
||
|
|
"""
|
||
|
|
next_wakeup_time = None
|
||
|
|
self._jobstores_lock.acquire()
|
||
|
|
try:
|
||
|
|
for alias, jobstore in iteritems(self._jobstores):
|
||
|
|
for job in tuple(jobstore.jobs):
|
||
|
|
run_times = job.get_run_times(now)
|
||
|
|
if run_times:
|
||
|
|
self._threadpool.submit(self._run_job, job, run_times)
|
||
|
|
|
||
|
|
# Increase the job's run count
|
||
|
|
if job.coalesce:
|
||
|
|
job.runs += 1
|
||
|
|
else:
|
||
|
|
job.runs += len(run_times)
|
||
|
|
|
||
|
|
# Update the job, but don't keep finished jobs around
|
||
|
|
if job.compute_next_run_time(now + timedelta(microseconds=1)):
|
||
|
|
jobstore.update_job(job)
|
||
|
|
else:
|
||
|
|
self._remove_job(job, alias, jobstore)
|
||
|
|
|
||
|
|
if not next_wakeup_time:
|
||
|
|
next_wakeup_time = job.next_run_time
|
||
|
|
elif job.next_run_time:
|
||
|
|
next_wakeup_time = min(next_wakeup_time,
|
||
|
|
job.next_run_time)
|
||
|
|
return next_wakeup_time
|
||
|
|
finally:
|
||
|
|
self._jobstores_lock.release()
|
||
|
|
|
||
|
|
def _main_loop(self):
|
||
|
|
"""Executes jobs on schedule."""
|
||
|
|
|
||
|
|
logger.info('Scheduler started')
|
||
|
|
self._notify_listeners(SchedulerEvent(EVENT_SCHEDULER_START))
|
||
|
|
|
||
|
|
self._wakeup.clear()
|
||
|
|
while not self._stopped:
|
||
|
|
logger.debug('Looking for jobs to run')
|
||
|
|
now = datetime.now()
|
||
|
|
next_wakeup_time = self._process_jobs(now)
|
||
|
|
|
||
|
|
# Sleep until the next job is scheduled to be run,
|
||
|
|
# a new job is added or the scheduler is stopped
|
||
|
|
if next_wakeup_time is not None:
|
||
|
|
wait_seconds = time_difference(next_wakeup_time, now)
|
||
|
|
logger.debug('Next wakeup is due at %s (in %f seconds)',
|
||
|
|
next_wakeup_time, wait_seconds)
|
||
|
|
self._wakeup.wait(wait_seconds)
|
||
|
|
else:
|
||
|
|
logger.debug('No jobs; waiting until a job is added')
|
||
|
|
self._wakeup.wait()
|
||
|
|
self._wakeup.clear()
|
||
|
|
|
||
|
|
logger.info('Scheduler has been shut down')
|
||
|
|
self._notify_listeners(SchedulerEvent(EVENT_SCHEDULER_SHUTDOWN))
|