PythonFlask中的芹菜超出应用程序内容

2024-03-29 10:51:42 发布

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我正在用python Flask建立一个网站。一切都很顺利,现在我正努力实施芹菜。

那也很顺利,直到我试着用一瓶芹菜邮件发邮件。现在我收到一个“在应用程序上下文之外工作”错误。

完全回溯是

  Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/celery/task/trace.py", line 228, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/celery/task/trace.py", line 415, in __protected_call__
    return self.run(*args, **kwargs)
  File "/home/ryan/www/CG-Website/src/util/mail.py", line 28, in send_forgot_email
    msg = Message("Recover your Crusade Gaming Account")
  File "/usr/lib/python2.7/site-packages/flask_mail.py", line 178, in __init__
    sender = current_app.config.get("DEFAULT_MAIL_SENDER")
  File "/usr/lib/python2.7/site-packages/werkzeug/local.py", line 336, in __getattr__
    return getattr(self._get_current_object(), name)
  File "/usr/lib/python2.7/site-packages/werkzeug/local.py", line 295, in _get_current_object
    return self.__local()
  File "/usr/lib/python2.7/site-packages/flask/globals.py", line 26, in _find_app
    raise RuntimeError('working outside of application context')
RuntimeError: working outside of application context

这是我的邮件功能:

@celery.task
def send_forgot_email(email, ref):
    global mail
    msg = Message("Recover your Crusade Gaming Account")
    msg.recipients = [email]
    msg.sender = "Crusade Gaming stuff@cg.com"
    msg.html = \
        """
        Hello Person,<br/>

        You have requested your password be reset. <a href="{0}" >Click here recover your account</a> or copy and paste this link in to your browser: {0} <br />

        If you did not request that your password be reset, please ignore this.
        """.format(url_for('account.forgot', ref=ref, _external=True))
    mail.send(msg)

这是我的芹菜档案:

from __future__ import absolute_import

from celery import Celery

celery = Celery('src.tasks',
                broker='amqp://',
                include=['src.util.mail'])


if __name__ == "__main__":
    celery.start()

Tags: inpytaskyouremaillibpackagesusr
3条回答

下面是一个解决方案,它可以使用flask应用程序工厂模式,还可以创建带有上下文的芹菜任务,而无需使用app.app_context()。在避免循环导入的同时获得该应用程序确实很难,但这解决了问题。这是为芹菜4.2这是最新的时候写的。

结构:

repo_name/
    manage.py
    base/
    base/__init__.py
    base/app.py
    base/runcelery.py
    base/celeryconfig.py
    base/utility/celery_util.py
    base/tasks/workers.py

因此base是本例中的主要应用程序包。在base/__init__.py中,我们创建芹菜实例,如下所示:

from celery import Celery
celery = Celery('base', config_source='base.celeryconfig')

base/app.py文件包含烧瓶应用程序工厂create_app,并注意它包含的init_celery(app, celery)

from base import celery
from base.utility.celery_util import init_celery

def create_app(config_obj):
    """An application factory, as explained here:
    http://flask.pocoo.org/docs/patterns/appfactories/.
    :param config_object: The configuration object to use.
    """
    app = Flask('base')
    app.config.from_object(config_obj)
    init_celery(app, celery=celery)
    register_extensions(app)
    register_blueprints(app)
    register_errorhandlers(app)
    register_app_context_processors(app)
    return app

转到base/runcelery.py内容:

from flask.helpers import get_debug_flag
from base.settings import DevConfig, ProdConfig
from base import celery
from base.app import create_app
from base.utility.celery_util import init_celery
CONFIG = DevConfig if get_debug_flag() else ProdConfig
app = create_app(CONFIG)
init_celery(app, celery)

接下来,base/celeryconfig.py文件(作为示例):

# -*- coding: utf-8 -*-
"""
Configure Celery. See the configuration guide at ->
http://docs.celeryproject.org/en/master/userguide/configuration.html#configuration
"""

## Broker settings.
broker_url = 'pyamqp://guest:guest@localhost:5672//'
broker_heartbeat=0

# List of modules to import when the Celery worker starts.
imports = ('base.tasks.workers',)

## Using the database to store task state and results.
result_backend = 'rpc'
#result_persistent = False

accept_content = ['json', 'application/text']

result_serializer = 'json'
timezone = "UTC"

# define periodic tasks / cron here
# beat_schedule = {
#    'add-every-10-seconds': {
#        'task': 'workers.add_together',
#        'schedule': 10.0,
#        'args': (16, 16)
#    },
# }

现在在base/utility/celery_util.py文件中定义init芹菜:

# -*- coding: utf-8 -*-

def init_celery(app, celery):
    """Add flask app context to celery.Task"""
    TaskBase = celery.Task
    class ContextTask(TaskBase):
        abstract = True
        def __call__(self, *args, **kwargs):
            with app.app_context():
                return TaskBase.__call__(self, *args, **kwargs)
    celery.Task = ContextTask

对于base/tasks/workers.py中的工人:

from base import celery as celery_app
from flask_security.utils import config_value, send_mail
from base.bp.users.models.user_models import User
from base.extensions import mail # this is the flask-mail

@celery_app.task
def send_async_email(msg):
    """Background task to send an email with Flask-mail."""
    #with app.app_context():
    mail.send(msg)

@celery_app.task
def send_welcome_email(email, user_id, confirmation_link):
    """Background task to send a welcome email with flask-security's mail.
    You don't need to use with app.app_context() here. Task has context.
    """
    user = User.query.filter_by(id=user_id).first()
    print(f'sending user {user} a welcome email')
    send_mail(config_value('EMAIL_SUBJECT_REGISTER'),
              email,
              'welcome', user=user,
              confirmation_link=confirmation_link) 

然后,您需要在repo_name文件夹中的两个不同的命令提示中启动芹菜节拍和芹菜工人。

在一个命令提示符下执行celery -A base.runcelery:celery beat,另一个命令提示符下执行celery -A base.runcelery:celery worker

然后,运行需要flask上下文的任务。应该有用。

Flask邮件需要Flask应用程序上下文才能正常工作。在芹菜端实例化app对象并使用app.app_上下文,如下所示:

with app.app_context():
    celery.start()

在mail.py文件中,导入“app”和“mail”对象。然后,使用请求上下文。做这样的事:

from whateverpackagename import app
from whateverpackagename import mail

@celery.task
def send_forgot_email(email, ref):
    with app.test_request_context():
        msg = Message("Recover your Crusade Gaming Account")
        msg.recipients = [email]
        msg.sender = "Crusade Gaming stuff@cg.com"
        msg.html = \
        """
        Hello Person,<br/>
        You have requested your password be reset. <a href="{0}" >Click here recover your account</a> or copy and paste this link in to your browser: {0} <br />
        If you did not request that your password be reset, please ignore this.
        """.format(url_for('account.forgot', ref=ref, _external=True))

        mail.send(msg)

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