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DatabaseScheduler: Reload config when Cron or Interval was changed #352

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DatabaseScheduler: Reload config when Cron or Interval was changed #352

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9 changes: 9 additions & 0 deletions djcelery/models.py
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Original file line number Diff line number Diff line change
Expand Up @@ -141,6 +141,8 @@ class CrontabSchedule(models.Model):
_('month of year'), max_length=64, default='*',
)

no_changes = False

class Meta:
verbose_name = _('crontab')
verbose_name_plural = _('crontabs')
Expand Down Expand Up @@ -182,6 +184,8 @@ class PeriodicTasks(models.Model):
ident = models.SmallIntegerField(default=1, primary_key=True, unique=True)
last_update = models.DateTimeField(null=False)

no_changes = False
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What is the purpose of this line here? Maybe it should be moved to IntervalSchedule?

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I try to re-use the same trigger for PeriodicTask when IntervalSchedule or CrontabSchedule has some change.

So, without this, you need to restart de celery beat to reload configuration of CrontabSchedule or IntervalSchedule, or you need to trigger some modification on PeriodicTask to reload configuration.

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That seems reasonable.
But this line is defined on PeriodicTasks class. I don't think it is needed here, since the signal is not connected with sender=PeriodicTasks. Meanwhile, IntervalSchedule doesn't have no_changes.


objects = managers.ExtendedManager()

@classmethod
Expand Down Expand Up @@ -289,6 +293,11 @@ def schedule(self):
signals.pre_delete.connect(PeriodicTasks.changed, sender=PeriodicTask)
signals.pre_save.connect(PeriodicTasks.changed, sender=PeriodicTask)

signals.pre_delete.connect(PeriodicTasks.changed, sender=IntervalSchedule)
signals.pre_save.connect(PeriodicTasks.changed, sender=IntervalSchedule)

signals.pre_delete.connect(PeriodicTasks.changed, sender=CrontabSchedule)
signals.pre_save.connect(PeriodicTasks.changed, sender=CrontabSchedule)

class WorkerState(models.Model):
hostname = models.CharField(_('hostname'), max_length=255, unique=True)
Expand Down