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from __future__ import absolute_import, unicode_literals
from celery import current_app
from celery.backends.base import BaseDictBackend
from celery.utils.timeutils import maybe_timedelta
from ..models import TaskMeta, TaskSetMeta
class DatabaseBackend(BaseDictBackend):
"""The database backend.
Using Django models to store task state.
"""
TaskModel = TaskMeta
TaskSetModel = TaskSetMeta
expires = current_app.conf.CELERY_TASK_RESULT_EXPIRES
create_django_tables = True
subpolling_interval = 0.5
def _store_result(self, task_id, result, status,
traceback=None, request=None):
"""Store return value and status of an executed task."""
self.TaskModel._default_manager.store_result(
task_id, result, status,
traceback=traceback, children=self.current_task_children(request),
)
return result
def _save_group(self, group_id, result):
"""Store the result of an executed group."""
self.TaskSetModel._default_manager.store_result(group_id, result)
return result
def _get_task_meta_for(self, task_id):
"""Get task metadata for a task by id."""
return self.TaskModel._default_manager.get_task(task_id).to_dict()
def _restore_group(self, group_id):
"""Get group metadata for a group by id."""
meta = self.TaskSetModel._default_manager.restore_taskset(group_id)
if meta:
return meta.to_dict()
def _delete_group(self, group_id):
self.TaskSetModel._default_manager.delete_taskset(group_id)
def _forget(self, task_id):
try:
self.TaskModel._default_manager.get(task_id=task_id).delete()
except self.TaskModel.DoesNotExist:
pass
def cleanup(self):
"""Delete expired metadata."""
expires = maybe_timedelta(self.expires)
for model in self.TaskModel, self.TaskSetModel:
model._default_manager.delete_expired(expires)
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