django - 如何使用 celery 和 Django 以编程方式生成 celerybeat 条目

Question

我希望能够以编程方式生成 celerybeat 条目并在添加条目时重新同步 celerybeat。文档 here状态

By default the entries are taken from the CELERYBEAT_SCHEDULE setting, but custom stores can also be used, like storing the entries in an SQL database.

所以我想弄清楚我需要扩展哪些类才能做到这一点。

我一直在看 celery scheduler docs和 djcelery api docs但是关于这些方法中的一些方法的文档并不存在，所以要深入研究一些来源，只是希望有人能指出我正确的方向。

我想我正在做的高级别的事情会有所帮助......作为用户，我需要能够从一组预定义的任务中进行选择，并为用户提供一种选择某种自定义计划的方法执行，例如每天/每周/每月以及什么日期和时间。

这也是在 Django 中使用 djcelery。

更新

我看到了 djcelery 管理员的代码，但不清楚这些数据是如何保存的。我目前有一个通用的 addTask看起来像这样的 View :

def addTask(request):

intervalSchedule = IntervalSchedule.from_schedule(schedule(timedelta(seconds=10)))
intervalSchedule.save()
modelData = dict(
    name="dcTestPersist",
    task="technologytrackerapi.views.createRecord",
    schedule=intervalSchedule,
)
periodicTask = PeriodicTask(**modelData)
periodicTask.save()
return render_to_response('taskView.html')

数据库中的数据看起来是正确的，但是当守护程序运行时，它出现以下错误:

[2012-03-06 00:23:07,926: WARNING/Beat] Process Beat:
[2012-03-06 00:23:07,926: WARNING/Beat] Traceback (most recent call last):
[2012-03-06 00:23:07,926: WARNING/Beat] File "/usr/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
[2012-03-06 00:23:07,926: WARNING/Beat] self.run()
[2012-03-06 00:23:07,927: WARNING/Beat] File "/home/dchesterman/Documents/PythonDev/.virtualenvs/ros/local/lib/python2.7/site-packages/celery/beat.py", line 464, in run
[2012-03-06 00:23:07,927: WARNING/Beat] self.service.start(embedded_process=True)
[2012-03-06 00:23:07,927: WARNING/Beat] File "/home/dchesterman/Documents/PythonDev /.virtualenvs/ros/local/lib/python2.7/site-packages/celery/beat.py", line 403, in start
[2012-03-06 00:23:07,927: WARNING/Beat] interval = self.scheduler.tick()
[2012-03-06 00:23:07,927: WARNING/Beat] File "/home/dchesterman/Documents/PythonDev/.virtualenvs/ros/local/lib/python2.7/site-packages/celery/beat.py", line 194, in tick
[2012-03-06 00:23:07,927: WARNING/Beat] next_time_to_run = self.maybe_due(entry, self.publisher)
[2012-03-06 00:23:07,927: WARNING/Beat] File "/home/dchesterman/Documents/PythonDev/.virtualenvs/ros/local/lib/python2.7/site-packages/celery/beat.py", line 170, in maybe_due
[2012-03-06 00:23:07,927: WARNING/Beat] is_due, next_time_to_run = entry.is_due()
[2012-03-06 00:23:07,928: WARNING/Beat] File "/home/dchesterman/Documents/PythonDev/.virtualenvs/ros/local/lib/python2.7/site-packages/djcelery/schedulers.py", line 54, in is_due
[2012-03-06 00:23:07,928: WARNING/Beat] return self.schedule.is_due(self.last_run_at)
[2012-03-06 00:23:07,928: WARNING/Beat] AttributeError: 'NoneType' object has no attribute 'is_due'

我不知道为什么我的日程安排不使用默认 is_due()

Answer 1

这就是最终为我工作的原因:

def addTask(request):

  intervalSchedule = IntervalSchedule.from_schedule(schedule(timedelta(seconds=10)))
  intervalSchedule.save()

  modelData = dict(
      name="dcTestPersist",
      task="technologytrackerapi.tasks.createRecord",
      interval_id=intervalSchedule.pk,
  )

  periodicTask = PeriodicTask(**modelData)
  periodicTask.save()

  me = ModelEntry(periodicTask)

  try:
      me.save()

  except:
    from django.db import connection
    print connection.queries
    raise

  return render_to_response('taskView.html')

我不得不将周期性任务包装在一个 ModelEntry 中。