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from django.core.exceptions import ImproperlyConfigured
try:
from importlib import import_module
except ImportError:
from django.utils.importlib import import_module
from django.db import connection, transaction
from haystack.utils import get_identifier
from .conf import settings
def get_update_task(task_path=None):
import_path = task_path or settings.CELERY_HAYSTACK_DEFAULT_TASK
module, attr = import_path.rsplit('.', 1)
try:
mod = import_module(module)
except ImportError as e:
raise ImproperlyConfigured('Error importing module %s: "%s"' %
(module, e))
try:
Task = getattr(mod, attr)
except AttributeError:
raise ImproperlyConfigured('Module "%s" does not define a "%s" '
'class.' % (module, attr))
return Task()
def enqueue_task(action, instance, **kwargs):
"""
Common utility for enqueing a task for the given action and
model instance.
"""
identifier = get_identifier(instance)
options = {}
if settings.CELERY_HAYSTACK_QUEUE:
options['queue'] = settings.CELERY_HAYSTACK_QUEUE
if settings.CELERY_HAYSTACK_COUNTDOWN:
options['countdown'] = settings.CELERY_HAYSTACK_COUNTDOWN
task = get_update_task()
task_func = lambda: task.apply_async((action, identifier), kwargs, **options)
if hasattr(transaction, 'on_commit'):
# Django 1.9 on_commit hook
transaction.on_commit(
task_func
)
elif hasattr(connection, 'on_commit'):
# Django-transaction-hooks
connection.on_commit(
task_func
)
else:
task_func()
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