I am trying to use celery w/ Django and not getting very far. I am also using django-celery-beat. I don't seem to be discovering the shared tasks in other modules.
Here is some code:
proj/proj/settings.py:
INSTALLED_APPS = [
"django_celery_beat",
"proj",
"proj.myapp",
]
CELERY_BROKER_URL = "amqp://user:password#localhost:5672/vhost"
proj/proj/__init__.py:
from proj.celery import app as celery_app
__all__ = ('celery_app',)
proj/proj/celery.py:
import os
from celery import Celery
from django.conf import settings
if not settings.configured:
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings')
app = Celery('proj')
app.config_from_object('django.conf:settings', namespace='CELERY')
app.autodiscover_tasks()
#app.task(bind=True)
def debug_task(self):
print(f'Request: {self.request!r}')
proj/app/tasks.py:
from celery import shared_task
#shared_task
def add(x, y):
return x + y
When I look at the admin interface for django-beat I only see the "proj.celery.debug_task" and not "myapp.tasks.add"
Any ideas why?
edit:
Argh!! It turns out that the "faker" library (which I was using in my silly test tasks) hadn't been installed in my environment. However, celery's autodiscover_tasks function fails silently - so I didn't know what the error was.
So basically, it was programmer stupidity.
Related
my version:
Django==3.2
celery==5.1.2
my settings.local:
CELERY_RESULT_BACKEND = 'redis://#127.0.0.1:6379/1'
celery.py:
from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
from django.conf import settings
# # 设置环境变量
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'cmdb.settings.local')
# 实例化
# app = Celery('celeryPro', include=['message.tasks'])
app = Celery('celeryPro', backend='redis://127.0.0.1:6379/1')
# app = Celery('cmdb')
# namespace='CELERY'作用是允许你在Django配置文件中对Celery进行配置
# 但所有Celery配置项必须以CELERY开头，防止冲突
app.config_from_object('django.conf:settings', namespace='CELERY')
# app.config_from_object(config, namespace='CELERY')
# 自动从Django的已注册app中发现任务
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
#app.task(bind=True)
def debug_task(self):
print('Request:{0!r}'.format(self.request))
always get the error
Your setup is incorrect in two ways.
You are adding the backend only when creating the instance of celery and also calling the config_from_object, as per the docs, any previous configuration is reset.
You are passing the incorrect config file to the config_from_object method. You need to send the file that Celery should use and not the one
that Django uses. You can find more info in the configuration docs.
As an example, you can have your celery.py file configured as below:
from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
from django.conf import settings
# # 设置环境变量
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'cmdb.settings.local')
# 实例化
# app = Celery('celeryPro', include=['message.tasks'])
# app = Celery('celeryPro', backend='redis://127.0.0.1:6379/1')
app = Celery('cmdb')
# namespace='CELERY'作用是允许你在Django配置文件中对Celery进行配置
# 但所有Celery配置项必须以CELERY开头，防止冲突
app.config_from_object('celery_config', namespace='CELERY')
# app.config_from_object(config, namespace='CELERY')
# 自动从Django的已注册app中发现任务
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
#app.task(bind=True)
def debug_task(self):
print('Request:{0!r}'.format(self.request))
and your celery_config.py file could be something like below:
broker_url = 'redis://localhost:6379/1'
result_backend = 'redis://localhost:6379/1'
Having your configuration for celery in a different file allows for more flexibility when you want to extend the configuration.
NOTE - you should keep the celery_config.py file in the root directory of the project i.e., in the same location as the manage.py file.
I am trying to send notifications using celery.
#shared_task(name='send_notifis')
def send_notifs(device_ids, title, message):
from pills_reminder.models import UserNotifications, UserDevice
devices = UserDevice.objects.filter(id__in=device_ids)
print(devices)
device_tokens = []
for device in devices:
UserNotifications.objects.create(
uid=device.device_id,
title=title,
message=message,
)
print(UserNotifications)
device_tokens.append(device.registration_token)
if len(device_tokens) > 1:
device_tokens = ["".join(token.split()) for token in device_tokens]
response = push_service.notify_multiple_devices(registration_ids=device_tokens,
message_title=title,
message_body=message)
elif len(device_tokens) == 1:
registration_id = "".join(device_tokens[0].split())
response = push_service.notify_single_device(registration_id=registration_id,
message_title=title,
message_body=message)
else:
pass
print(response)
return True
this works without .delay() and when running using
python manage.py shell
>>> send_notifs.delay(devices, title='title', message='message')
<AsyncResult: f54188f8-cec6-42dd-a840-b097abffd7f4>
but it freezes when i call using Django Model post_save signal.
#receiver(post_save, sender=Notification)
def Notification_post_save_handler(sender, instance, **kwargs):
print('hello from post_save signal')
devices = instance.get_devices()
# send_notifs(devices)
if len(devices)>0:
send_notifs.delay(devices,
title=instance.title,
message=instance.message)
This above code freezes execution, but without .delay. it works fine.
UPADATE:1
the above task with .delay is running from python manage.py shell not from runserver . so the problem is with celery and Django settings. Hence i dig deep and found out
while running from shell i get,
>>> add.app.conf #(add is a async task here)
{'broker_url': 'redis://localhost:6379/1'}, ...
but running from runserver gives:
`{'broker_url': None}`
Now i am looking for how to set the settings properly ? I am using django-configurations with celery.py as
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', 'core.settings')
os.environ.setdefault('DJANGO_CONFIGURATION', 'Development')
import configurations
configurations.setup()
app = Celery('core')
app.config_from_object('django.conf:settings', namespace='CELERY')
app.autodiscover_tasks()
#app.task(bind=True)
def debug_task(self):
print('Request: {0!r}'.format(self.request))
Any help is appreciated. Thank you for your time and patience.
use this
from configurations import importer
importer.install()
in place of
import configurations
configurations.setup()
Turns out the settings sepecified in django-configuration docs for including celery was causing the problem. Modified celery.py, and now it is working fine.
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', 'core.settings')
os.environ.setdefault('DJANGO_CONFIGURATION', 'Development')
from configurations import importer
importer.install()
# import configurations
# configurations.setup()
app = Celery('core')
app.config_from_object('django.conf:settings', namespace='CELERY')
app.autodiscover_tasks()
#app.task(bind=True)
def debug_task(self):
print('Request: {0!r}'.format(self.request))
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 want to display the current exchnage rate of USD/Bitcoin price-pair on my website.
Therefor i set celery and a small periodic_task.
Im currently not really able to understand how i call this periodic_task task or display the json data it returns.
this is how my celeter setup look like:
__init_.py
from __future__ import absolute_import, unicode_literals
from .celery import app as celery_app
__all__ = ('celery_app',)
celery.py
from __future__ import absolute_import, unicode_literals
from celery import Celery
import os
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
app = Celery('myproject')
app.config_from_object('django.conf:settings', namespace='CELERY')
app.autodiscover_tasks()
#app.task(bind=True)
def debug_task(self):
print('Request: {0!r}'.format(self.request))
tasks.py
from celery import Celery
from celery.schedules import crontab
from celery.task import periodic_task
from celery.utils.log import get_task_logger
import requests
logger = get_task_logger(__name__)
app = Celery('tasks', broker='redis://127.0.0.1')
#app.task
def test():
return "Test Successful"
#periodic_task(run_every=(crontab(minute='*/15')), name="get_btc_exchange_rate", ignore_result=True)
def get_exchange_rate():
api_url = "https://api.coinmarketcap.com/v1/ticker/?limit=1"
try:
exchange_rate = requests.get(api_url).json()
logger.info("BTC Exchange rate updated.")
except Exception as e:
print(e)
exchange_rate = dict()
return exchange_rate
I'm currently stating celery with this script:
https://gist.github.com/psych0der/44a8994495abee1b4e832420c1c2974d
So my question is how can i trigger that periodic_task and display the return of the json data/field "price_usd"? in a template
Thanks in advance
You'll need to start a celerybeat instance. It will schedule and send off events that you can set on an interval.
http://docs.celeryproject.org/en/latest/userguide/periodic-tasks.html
I have to use Celery 4.0.2 with RabbitMQ 3.6.10 to handle an async task. Then, I have followed this tutorial: https://www.codementor.io/uditagarwal/asynchronous-tasks-using-celery-with-django-du1087f5k
However, I have a slight problem with my task because it's impossible to have a result. My task always remains in "PENDING" state.
My question is what i have to do to get a result ?
Thank you in advance for your answer.
Here my code:
Here my __init_.py:
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']
Here a part of my setting.py:
BROKER_URL = 'amqp://guest:guest#localhost//'
CELERY_ACCEPT_CONTENT = ['json']
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'
Here my 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', 'mysite.settings')
app = Celery('mysite',
backend='amqp',
broker='amqp://guest#localhost//')
# Using a string here means the worker don'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()
#app.task(bind=True)
def debug_task(self):
print('Request: {0!r}'.format(self.request))
And my tasks.py
# Create your tasks here
from __future__ import absolute_import, unicode_literals
from celery import shared_task
#shared_task
def add(x, y):
test = "ok"
current_task.update_state(state='PROGRESS',
meta={'test': ok})
return x + y
And here my Django Shell:
>>> from blog.tasks import *
>>> job = add.delay(2,3)
>>> job.state
'PENDING'
>>> job.result
>>>
With a picture of my RabbitMQ interface:
You need to start a worker that will process the tasks you add to queue. From your virtualenv run:
celery worker -A blog -l info