I am following the tutorial on here to get periodic tasks defined in my django project working.
The article suggests having a celery.py file of the form:
from celery import Celery
from celery.schedules import crontab
app = Celery()
#app.on_after_configure.connect
def setup_periodic_tasks(sender, **kwargs):
# Calls test('hello') every 10 seconds.
sender.add_periodic_task(10.0, my_task.s('hello'), name='add every 10')
)
#app.task
def my_task(arg):
print(arg)
which works. Now this is good but I don't want to define my tasks locally. my question is, how can I add tasks from other apps?
I have created a blank project called my_proj and it has two apps: my_proj and app_with_tasks. the celery.py file above is at the root level in my_proj app's directory and I want to add periodic tasks from app_with_tasks 's tasks.py file.
I do have app_with_tasks listed in Installed-apps for my_proj settings file but I still can't import anything from an app to anther.
my understanding is that I should use:
from app_with_tasks.tasks import task1
but my_proj will then show as unresolved reference in PyCharm.
I'll tell you what I'm using. Maybe it helps you
my_proj/celery.py
import os
import celery
# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'my_proj.settings')
app = celery.Celery('app_django')
app.config_from_object('django.conf.settings')
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
then in app_with_tasks, add file tasks.py
from my_proj.celery import app
from django.apps import apps
#app.task(bind=False)
def your_task(some_arg):
A_Model = apps.get_model('my_proj', 'A_Model')
....
command to start celery server (restart this every time you change a task to reload tasks.py files)
/path/to/virtualenv/bin/celery --app=my_proj.celery:app --loglevel=INFO --concurrency=4 -n default_worker worker
To call the task (here you should use your add_periodic_task code)
from app_with_tasks.tasks import your_task
your_task.apply_async(args=[123], kwargs=None)
Related
I'm using Celery 4.4 with Django 2.2
I have to create a Periodic Task, I'm extending PeriodicTask ask as
from celery.schedules import crontab
from celery.task import PeriodicTask
class IncompleteOrderHandler(PeriodicTask):
run_every = crontab(
minute='*/{}'.format(getattr(settings, 'INCOMPLETE_ORDER_HANDLER_PULSE', 5))
)
def run(self, *args, **kwargs):
# Task definition
eligible_users, slot_begin, slot_end = self.get_users_in_last_slot()
map(lambda user: self.process_user(user, slot_begin, slot_end), eligible_users)
Earlier to register the above task, I used to call
from celery.registry import tasks
tasks.register(IncompleteOrderHandler)
But now there is no registry module in the celery. How can I register the above periodic task?
I had the same problem with class based celery tasks. This has to works, but it doesn't!
Accidentally, my problem solved by every one on these two changes:
I import one of the class based tasks at tasks.py in viewsets.py, and suddenly i figured out that after doing that, celery found all of the tasks at tasks.py.
This was my base celery setting file:
from __future__ import absolute_import
import os
from celery import Celery
from django.conf import settings
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'picha.settings')
app = Celery('picha')
app.config_from_object('django.conf:settings')
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
I changed the last line to app.autodiscover_tasks(lambda:
settings.CELERY_TASKS) and add CELERY_TASKS list to settings.py and write all
tasks.py file paths in it and then celery found tasks.
I hope one of these work for you.
i'm trying found how celery is working. i have a project that have about 10 app.now i want use celery .
setting.py:
CELERY_BROKER_URL = 'amqp://rabbitmq:rabbitmq#localhost:5672/rabbitmq_vhost'
CELERY_RESULT_BACKEND = 'redis://localhost'
i created a user in rabbitmq with this info:username: rabbitq and password:rabbitmq . then i create a vhost with name rabbitmq_vhost and add rabbitmq permission to it. all is fine i think because all of error about rabbitmq disappear .
here is my test.py:
from .task import when_task_expiration
def test_celery():
result = when_task_expiration.apply_async((2, 2), countdown=3)
print(result.get())
task.py:
from __future__ import absolute_import, unicode_literals
import logging
from celery import shared_task
from proj.celery import app
#app.task
def when_task_expiration(task, x):
print(task.id, 'task done')
return True
celery.py:
from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings')
app = Celery('proj')
# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
# should have a `CELERY_` prefix.
app.config_from_object('django.conf:settings', namespace='CELERY')
# Load task modules from all registered Django app configs.
app.autodiscover_tasks()
now when i call test_celery() in python shell it's pending.i try to replace #shared_task and #app.task(bind=True) but noting changed.even i try use .delay() instead apply_async((2, 2), countdown=3) and again nothing happend.
i'm trying to use celery to call a function in specific time during this quesation that i ask in past.thank you.
You most likely forgot to run at least one Celery worker process. To do so, execute the following in the shell: celery worker -A proj.celery -c 4 -l DEBUG (here I assumed your Celery application is defined in proj/celery.py as you have Celery('proj') in there)
I'm trying to create my first Celery task. The task will send the same e-mail every one minute to the same person.
According to the documentation, I create my first task in my project.
from __future__ import absolute_import, unicode_literals
from celery import shared_task
from django.core.mail import send_mail
#shared_task
def send_message():
to = ['test#test.com', ]
send_mail('TEST TOPIC',
'TEST MESSAGE',
'test#test.com',
to)
Then, in my project's ja folder, I add the celery.py file, which looks like this:
from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
from django.conf import settings
from celery.schedules import crontab
# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'app_rama.settings')
app = Celery('app_rama')
# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
# should have a `CELERY_` prefix.
app.config_from_object('django.conf:settings')
# Load task modules from all registered Django app configs.
app.autodiscover_tasks(settings.INSTALLED_APPS)
app.conf.beat_schedule = {
'send-message-every-single-minute': {
'task': 'app.tasks.send_message',
'schedule': crontab(), # change to `crontab(minute=0, hour=0)` if you want it to run daily at midnight
},
}
Then in the __int__.py file of my project I added:
from __future__ import absolute_import, unicode_literals
# This will make sure the app is always imported when
# Django starts so that shared_task will use this app.
from .celery import app as celery_app
__all__ = ('celery_app',)
And the last thing I try to do is run the command:
celery -A app_rama worker -l info
And then I receive the following error:
[2019-06-27 16:01:26,750: ERROR/MainProcess] consumer: Cannot connect to amqp://guest:**#127.0.0.1:5672//: [WinError 10061]
I tried many solutions from the forum, but I did not find the correct one.
I was also not helped by adding the following settings to my settings.py file:
CELERY_BROKER_URL = 'amqp://guest:guest#localhost:5672//'
How can I solve this error so that my task works in the background of the application?
Your Celery broker is probably misconfigured. Read the "Using RabbitMQ" document to find out how to setup RabbitMQ properly (I assumed you want to use RabbitMQ as you had "amqp" protocol in your example).
I recommend learning Celery with Redis, as it is easier to setup and manage. Then once you learn the basics you may decide to move to RabbitMQ or some other supported broker...
Also, verify that your RabbitMQ server is running properly. If you use Windows, make sure some software on it does not prevent user processes to connect to the localhost:5672.
I've got a django app that's trying to call a celery task that will eventually be executed on some remote hosts. The task codebase is completely separate to the django project, so I'm using celery.execute.send_task and calling it from a post_delete model signal. The code looks a bit like this:
class MyModel(models.Model):
#staticmethod
def do_async_thing(sender, instance, **kwargs):
celery.execute.send_task("tasks.do_my_thing", args=[instance.name])
signals.post_delete.connect(MyModel.do_async_thing, sender=MyModel)
I'm using the latest Django (1.6.1) and celery 3.1.7, so I understand that I don't need any extra module or app in my django project for it to be able to talk to celery. I've set BROKER_URL inside my settings.py to be the right url amqp://user:password#host/vhost.
When this method fires, I get a Connection Refused error. There's no indication on the celery broker that any connection was attempted - I guess it's not seeing the BROKER_URL configuration and is trying to connect to localhost.
How do I make this work? What extra configuration does send_task need to know where the broker is?
So I discovered the answer, and it was to do with not reading the tutorial (http://docs.celeryproject.org/en/latest/django/first-steps-with-django.html) closely enough.
Specifically, I had the correct celery.py in place which I would have thought should have loaded the settings, but I'd missed the necessary changes to __init__.py in the django project, which wasn't hooking everything together.
My celery.py should be:
from __future__ import absolute_import
import os
from celery import Celery
from django.conf import settings
# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
app = Celery('mypoject')
# Using a string here means the worker will not have to
# pickle the object when using Windows.
app.config_from_object('django.conf:settings')
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
and the __init__.py should be simply:
from __future__ import absolute_import
# This will make sure the app is always imported when
# Django starts so that shared_task will use this app.
from .celery import app as celery_app
I'm creating a test scenario for Celery/RabbitMQ/Django. After browsing/reading the various posts similar to mine, I found this one, the closest, but still does not help me. I'm having the "ImportError: no module named tasks" error when executing celery worker.
Celery: 3.1.5 (not dj-celery)
Django: 1.5.5
Project structure:
testcele/ (project name)
mycelery/ (myapp)
__init__
tasks
testcele/
__init__
celery_task
settings
testcele/testcele/celery_task:
from __future__ import absolute_import
import os
from celery import Celery, task, current_task
from django.conf import settings
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'testcele.settings')
app = Celery('testcele', backend='amqp', broker='amqp://guest#localhost//',
include=['tasks'])
if __name__ == '__main__':
app.start()
# Using a string here means the worker will not have to
# pickle the object when using Windows.
app.config_from_object('django.conf:settings')
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
testcele/testcele/init.py:
from __future__ import absolute_import
from .celery_task import app as celery_app
mycelery/tasks.py:
from __future__ import absolute_import
from celery import Celery, task, current_task, shared_task
#shared_task()
def create_models():
.
.
.
I'm running: "celery worker -A testcele -l INFO", at the "testcele/" sub-dir. I have also tried running from testcele/testcel sub-dir, from testcele/mycelery, replacing "testcele" on the celery worker command with "tasks" or "mycelery". Obviously, this gives other errors.
What I am missing?
Thanks, Ricardo
Try adding a __init__.py file in your mycelery folder to make it a module. If that didn't work specify the tasks when defining your app. Like so:
app = Celery('testcele', backend='amqp', broker='amqp://guest#localhost//',
include=['mycelery.tasks'])