CODEWITHSUNDEEP
djangocelerydjango-celerykombu
user1034697
user1034697

Reputation:

Django and Celery: Tasks not imported

I am using Django with Celery to run two tasks in the background related to contacts/email parsing.

Structure is:

project
   /api
   /core
       tasks.py
   settings.py

settings.py file contains:

BROKER_URL = 'django://'
BROKER_BACKEND = "djkombu.transport.DatabaseTransport"

#celery
BROKER_HOST = "localhost"
BROKER_PORT = 5672
BROKER_USER = "guest"
BROKER_PASSWORD = "guest"
BROKER_VHOST = "/"

sys.path.append(os.path.dirname(os.path.basename(__file__)))
CELERY_IMPORTS = ['project.core.tasks']

import djcelery
djcelery.setup_loader()

# ....

INSTALLED_APPS = (
    #...

    'kombu.transport.django',
    'djcelery',
)

tasks.py contains:

from celery.task import Task
from celery.registry import tasks

class ParseEmails(Task):
    #...

class ImportGMailContactsFromGoogleAccount(Task):
    #...

tasks.register(ParseEmails)
tasks.register(ImportGMailContactsFromGoogleAccount)

Also, added in wsgi.py

os.environ["CELERY_LOADER"] = "django"

Now, I have this app hosted on a WebFactional server. On my localhost this runs fine, but on the WebFaction server, where the Django app is deployed on a Apache server, I get:

2013-01-23 17:25:00,067: ERROR/MainProcess] Task project.core.tasks.ImportGMailContactsFromGoogleAccount[df84e03f-9d22-44ed-a305-24c20407f87c] raised exception: Task of kind 'project.core.tasks.ImportGMailContactsFromGoogleAccount' is not registered, please make sure it's imported.

But the tasks show up as registered. If I run

python2.7 manage.py celeryd -l info

I obtain:

 -------------- [email protected] v3.0.13 (Chiastic Slide)
---- **** ----- 
--- * ***  * -- [Configuration]
-- * - **** --- . broker:      django://localhost//
- ** ---------- . app:         default:0x1e55350 (djcelery.loaders.DjangoLoader)
- ** ---------- . concurrency: 8 (processes)
- ** ---------- . events:      OFF (enable -E to monitor this worker)
- ** ---------- 
- *** --- * --- [Queues]
-- ******* ---- . celery:      exchange:celery(direct) binding:celery
--- ***** ----- 

[Tasks]
  . project.core.tasks.ImportGMailContactsFromGoogleAccount
  . project.core.tasks.ParseEmails

I thought it could be a relative import error, but I assumed the changes in settings.py and wsgi.py would prevent that.

I am thinking the multiple Python version supported by WebFactional could have to do with this, however I installed all the libraries for Python 2.7 and I am also running Django for 2.7, so there should be no problem with that.

Running in localhost using celeryd -l info the Tasks also show up in the list when I start the worker but it doesn't output the error when I call the task - it runs perfectly.

Thank you

Upvotes: 5

Views: 6916

Answers (1)

Aapo Rista
Aapo Rista

Reputation: 121

I had the same issue in a new Ubuntu 12.04 / Apache / mod_wsgi / Django 1.5 / Celery 3.0.13 production environment. Everything works fine on my Mac Os X 10.8 laptop and my old server (which has Celery 3.0.12), but not on the new server.

It seems there is some issue in Celery: https://github.com/celery/celery/issues/1150

My initial solution was changing my Task class based task to @task decorator based, from something like this:

class CreateInstancesTask(Task):
    def run(self, pk):
        management.call_command('create_instances', verbosity=0, pk=pk)
tasks.register(CreateInstancesTask)

to something like this:

@task()
def create_instances_task(pk):
    management.call_command('create_instances', verbosity=0, pk=pk)

Now this task seems to work, but of course I've to do some further testing...

Upvotes: 1

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