mirror of
https://github.com/django-q2/django-q2.git
synced 2026-09-24 03:48:11 +08:00
89 lines
2.6 KiB
Python
89 lines
2.6 KiB
Python
from datetime import timedelta
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from time import sleep
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from django import db
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from django.db import transaction
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from django.utils import timezone
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from django_q.brokers import Broker
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from django_q.conf import Conf, logger
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from django_q.models import OrmQ
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def _timeout():
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return timezone.now() - timedelta(seconds=Conf.RETRY)
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class ORM(Broker):
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@staticmethod
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def get_connection(list_key: str = Conf.PREFIX):
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if transaction.get_autocommit(
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using=Conf.ORM
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): # Only True when not in an atomic block
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# Make sure stale connections in the broker thread are explicitly
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# closed before attempting DB access.
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# logger.debug("Broker thread calling close_old_connections")
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db.close_old_connections()
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else:
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logger.debug("Broker in an atomic transaction")
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return OrmQ.objects.using(Conf.ORM)
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def queue_size(self) -> int:
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return (
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self.get_connection()
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.filter(key=self.list_key, lock__lte=_timeout())
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.count()
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)
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def lock_size(self) -> int:
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return (
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self.get_connection().filter(key=self.list_key, lock__gt=_timeout()).count()
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)
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def purge_queue(self):
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return self.get_connection().filter(key=self.list_key).delete()
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def ping(self) -> bool:
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return True
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def info(self) -> str:
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if not self._info:
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self._info = f"ORM {Conf.ORM}"
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return self._info
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def fail(self, task_id):
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self.delete(task_id)
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def enqueue(self, task):
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package = self.get_connection().create(
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key=self.list_key, payload=task, lock=_timeout()
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)
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return package.pk
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def dequeue(self):
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tasks = self.get_connection().filter(key=self.list_key, lock__lt=_timeout())[
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0 : Conf.BULK
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]
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if tasks:
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task_list = []
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for task in tasks:
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if (
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self.get_connection()
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.filter(id=task.id, lock=task.lock)
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.update(lock=timezone.now())
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):
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task_list.append((task.pk, task.payload))
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# else don't process, as another cluster has been faster than us on that task
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return task_list
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# empty queue, spare the cpu
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sleep(Conf.POLL)
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def delete_queue(self):
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return self.purge_queue()
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def delete(self, task_id):
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self.get_connection().filter(pk=task_id).delete()
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def acknowledge(self, task_id):
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return self.delete(task_id)
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