Django配置celery定時任務

安裝celery

• 使用redis+celery的方式（使用的是阿裡源，也可以選擇不用）

pip install -i https://mirrors.aliyun.com/pypi/simple/ -U "celery[redis]"           

修改Django的settings配置檔案

• 添加celery檔案

  在app同級目錄下添加一個檔案夾，例：service_celery

在檔案夾中添加celery.py檔案，内容如下：

#!/usr/bin/env python
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', 'settings')

app = Celery('bank_service')

# 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()

@app.task(bind=True)
def debug_task(self):
    print('Request: {0!r}'.format(self.request))
           

• 配置settings檔案，在settings.py中添加：

# import djcelery
# djcelery.setup_loader()

CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/1",
        "OPTIONS": {
           "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    }
}

REDIS_URL = CACHES['default']['LOCATION']
CELERY_BROKER_URL = REDIS_URL
BROKER_URL = REDIS_URL           

使用celery任務

• 建立異步任務

  在app同級目錄下添加一個檔案夾，例：service_tasks

在檔案夾中添加tasks.py檔案，内容如下：

from service_celery.celery import app
import time
@app.task(bind=True)
def add_num(self, a, b):
    time.sleep(1)
    c = a+b
    print(c)           

• 調用異步任務

from service_tasks.tasks import add_num
a, b = 1, 2
add_num.delay(a, b)
print("success")           

啟動celery

• 啟動

# ../venv_bank/bin/celery是我本地celery的路徑，也可以直接使用celery
# worker後的都是一些配置方面的，也可以去掉
../venv_bank/bin/celery -A bank_service worker --loglevel=info  --max-tasks-per-child 500 --autoscale=8,4