我真的在努力为Flask，SQLAlchemy和Celery设置正确的设置。我进行了广泛的搜索并尝试了不同的方法，但似乎没有任何效果。我错过了应用程序上下文或无法运行工作程序，或者还有其他问题。该结构非常通用，因此我可以构建一个更大的应用程序。
我正在使用:Flask 0.10.1，SQLAlchemy 1.0，Celery 3.1.13，我当前的设置如下:
app / __ init__.py
#Empty
app / config.py
import os
basedir = os.path.abspath(os.path.dirname(__file__))
class Config:
@staticmethod
def init_app(app):
pass
class LocalConfig(Config):
DEBUG = True
SQLALCHEMY_DATABASE_URI = r"sqlite:///" + os.path.join(basedir,
"data-dev.sqlite")
CELERY_BROKER_URL = 'amqp://guest:guest@localhost:5672//'
config = {
"local": LocalConfig}
app / exstensions.py
from flask.ext.sqlalchemy import SQLAlchemy
from celery import Celery
db = SQLAlchemy()
celery = Celery()
app / factory.py
from extensions import db, celery
from flask import Flask
from flask import g
from config import config
def create_before_request(app):
def before_request():
g.db = db
return before_request
def create_app(config_name):
app = Flask(__name__)
app.config.from_object(config[config_name])
db.init_app(app)
celery.config_from_object(config)
# Register the blueprints
# Add the before request handler
app.before_request(create_before_request(app))
return app
app / manage.py
from factory import create_app
app = create_app("local")
from flask import render_template
from flask import request
@app.route('/test', methods=['POST'])
def task_simple():
import tasks
tasks.do_some_stuff.delay()
return ""
if __name__ == "__main__":
app.run()
app / models.py
from extensions import db
class User(db.Model):
__tablename__ = "user"
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(128), unique=True, nullable=False)
app / tasks.py
from extensions import celery
from celery.signals import task_prerun
from flask import g, current_app
@task_prerun.connect
def close_session(*args, **kwargs):
with current_app.app_context():
# use g.db
print g
@celery.task()
def do_some_stuff():
with current_app.app_context():
# use g.db
print g
在文件夹应用中:
python.exe manage.py celery.exe worker -A tasks 我收到一个导入错误，对我来说没有任何意义。
我应该以不同的方式构造应用程序吗？最后，我想我想要一个非常基本的设置，例如通过将Flask与工厂模式一起使用，可以使用Flask-SQLAlchmey扩展名，并需要一些工作人员来访问数据库。
非常感谢您的帮助。
启动 celery worker 时执行回溯。
Traceback (most recent call last):
File "[PATH]\scripts\celery-script.py", line 9, in <module>
load_entry_point('celery==3.1.13', 'console_scripts', 'celery')()
File "[PATH]\lib\site-packages\celery\__main__.py", line 30, in main
main()
File "[PATH]\lib\site-packages\celery\bin\celery.py", line 81, in main
cmd.execute_from_commandline(argv)
File "[PATH]\lib\site-packages\celery\bin\celery.py", line 769, in execute_from_commandline
super(CeleryCommand, self).execute_from_commandline(argv)))
File "[PATH]\lib\site-packages\celery\bin\base.py", line 305, in execute_from_commandline
argv = self.setup_app_from_commandline(argv)
File "[PATH]\lib\site-packages\celery\bin\base.py", line 473, in setup_app_from_commandline
user_preload = tuple(self.app.user_options['preload'] or ())
AttributeError: 'Flask' object has no attribute 'user_options'
更新我根据注释中的建议更改代码。工作程序现在启动，但是在测试时使用
http://127.0.0.1:5000/test的get请求。我得到以下回溯:Traceback (most recent call last):
File "[PATH]\lib\site-packages\celery\app\trace.py", line 230, in trace_task
args=args, kwargs=kwargs)
File "[PATH]\lib\site-packages\celery\utils\dispatch\signal.py", line 166, in send
response = receiver(signal=self, sender=sender, \**named)
File "[PATH]\app\stackoverflow\tasks.py", line 7, in close_session
with current_app.app_context():
File "[PATH]\lib\site-packages\werkzeug\local.py", line 338, in __getattr__
return getattr(self._get_current_object(), name)
File "[PATH]\lib\site-packages\werkzeug\local.py", line 297, in _get_current_object
return self.__local()
File "[PATH]\lib\site-packages\flask\globals.py", line 34, in _find_app
raise RuntimeError('working outside of application context')
RuntimeError: working outside of application context exc, exc_info.traceback)))
更新基于Marteen的评论，我更改了代码。当前的工作版本在https://gist.github.com/anonymous/fa47834db2f4f3b8b257下。
欢迎任何进一步的改进或建议。
最佳答案
我不喜欢current_app的建议。
您的celery对象需要访问应用程序上下文。我在网上找到了有关使用工厂功能创建Celery对象的信息。以下示例在没有消息代理的情况下进行了测试。
#factory.py
from celery import Celery
from config import config
def create_celery_app(app=None):
app = app or create_app(config)
celery = Celery(__name__, broker=app.config['CELERY_BROKER_URL'])
celery.conf.update(app.config)
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
return celery
在tasks.py中:
#tasks.py
from factory import create_celery_app
from celery.signals import task_prerun
from flask import g
celery = create_celery_app()
@task_prerun.connect
def celery_prerun(*args, **kwargs):
#print g
with celery.app.app_context():
# # use g.db
print g
@celery.task()
def do_some_stuff():
with celery.app.app_context():
# use g.db
g.user = "test"
print g.user
一些链接:
Flask pattern for creating a Celery instance with factory function
Application using both application factory and celery
Source for said application's factory.py
Source for application tasks.py
关于flask - 带create_app，SQLAlchemy和Celery的 flask ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25360136/