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我正在尝试在基于 Flask 的网络应用程序中使用 celery 并监视它的状态。我的想法是将任务的 id 存储在会话中，并将其用于状态轮询。

这是我的tasks.py的内容

from traceback import format_exc
import settings
from celery import Celery, current_task
from celery.utils.log import get_task_logger
from celery.result import AsyncResult

from nimble_auth import make_nimble_req

logger = get_task_logger(__name__)

celery = Celery('tasks')
celery.config_from_object(settings)

@celery.task
def make_work(param1, param2):
    try:
        # work here
        current_task.update_state(state='PROGRESS', meta={'current': page, 'total': total_pages})
    except StandardError:
        logger.error(format_exc())

def get_asynctask(task_id):
    return AsyncResult(task_id)

除了主应用程序的文件 web.py

@app.route('/task_state/<task_id>')
def task_state(task_id):
    return get_asynctask(task_id).state # from task.py

@app.route('/reset_task')
def reset_task():
    del session['celery_task_id']
    return redirect(url_for('index'))

@app.route('/run')
def run_task():
    task = make_work.delay(1, 2)
    session['celery_task_id'] = task.task_id
    flash('Task submitted OK!')

    return redirect(url_for('index'))

设置文件：

BROKER_URL = 'mongodb://localhost:27017/dramba'
CELERY_RESULT_BACKEND = "mongodb"
CELERY_RESULT_DBURI = 'mongodb://localhost:27017/dramba'

但是当我试图获取任务的状态时，我得到了 NotImplementedError: No result backend configures。

完整的堆栈跟踪：

Traceback (most recent call last):
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/cleg/Projects/GitHub/Dramba/dramba.py", line 13, in task_state
    return get_asynctask(task_id).state
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/celery/result.py", line 284, in state
    return self.backend.get_status(self.id)
  File "/Users/cleg/Projects/Venvs/Dramba/lib/python2.7/site-packages/celery/backends/base.py", line 490, in _is_disabled
    raise NotImplementedError('No result backend configured.  '
NotImplementedError: No result backend configured.  Please see the documentation for more information.

我究竟做错了什么？

4

4 回答 4

1

您是否设置了 CELERY_MONGODB_BACKEND_SETTINGS 字典？此页面向您展示了一个示例：

http://docs.celeryproject.org/en/latest/configuration.html#mongodb-backend-settings

CELERY_RESULT_BACKEND = "mongodb"
CELERY_MONGODB_BACKEND_SETTINGS = {
*    "host": "192.168.1.100",
*    "port": 30000,
*    "database": "mydb",
*    "taskmeta_collection": "my_taskmeta_collection",
}
于 2012-11-08T15:33:38.477 回答
1

你可以这样做：

@app.route('/task_state/<task_id>')
def task_state(task_id):
    return celery.result.AsyncResult(task_id).state # from task.py

您需要使用 Celery Надо использовать уже существующий экземпляр Celery 的当前实例

于 2013-09-30T10:09:37.137 回答
1

似乎 Flask 本身无法从您的文件中正确获取配置。尝试明确指定它，看看它是否有帮助：http ://docs.celeryproject.org/en/latest/userguide/application.html#example-2-using-a-configuration-module

另外，为了确定，Flask 进程的标准输出上是否有任何消息？

于 2012-11-13T22:47:18.940 回答
1

尝试类似...

app = Celery('anytaskname',backend="celery.backends.amqp:AMQPBackend")

它在 Windows 上使用 Django 1.8 和 Celery 3.1.25 以及 RabbitMQ 代理 文档信息

于 2018-03-26T15:55:05.550 回答