python 3.10
在 venv
上运行于 Windows 10 pro
。
我正在尝试遵循
Celery
和 Flask
集成教程:https://flask.palletsprojects.com/en/latest/patterns/celery/
# example.py
from celery import Celery, Task
from flask import Flask
def celery_init_app(app: Flask) -> Celery:
class FlaskTask(Task):
def __call__(self, *args: object, **kwargs: object) -> object:
with app.app_context():
return self.run(*args, **kwargs)
celery_app = Celery(app.name, task_cls=FlaskTask)
celery_app.config_from_object(app.config["CELERY"])
celery_app.set_default()
app.extensions["celery"] = celery_app
return celery_app
def create_app() -> Flask:
app = Flask(__name__)
app.config.from_mapping(
CELERY=dict(
# Redis Docker container connection string
broker_url="redis://default:redispw@localhost:55000",
result_backend="redis://default:redispw@localhost:55000",
task_ignore_result=True,
),
)
app.config.from_prefixed_env()
celery_init_app(app)
return app
# make_celery.py
from example import create_app
flask_app = create_app()
celery_app = flask_app.extensions["celery"]
命令行调用:
celery -A make_celery worker --loglevel INFO
遇到:
Unrecoverable error: AttributeError("Can't pickle local object 'celery_init_app.<locals>.FlaskTask'")
[...]
.venv\lib\site-packages\billiard\reduction.py", line 123, in steal_handle
return _winapi.DuplicateHandle(
PermissionError: [WinError 5] Access is denied
示例存储库上出现相同的错误和回溯: https://github.com/pallets/flask/tree/main/examples/celery
我该如何解决这个问题? 有哪些替代方案可用?
尝试将
class FlaskTask(Task)
移出 celery_init_app
函数的局部范围,但随后我显然失去了对 app
变量的访问权限。
我遇到了同样的问题。将 celery_init_app 更改为这样可以修复它
celery_app = Celery(app.name)
celery_app.config_from_object(app.config["CELERY"])
celery_app.Task = FlaskTask
我希望我能解释一下“为什么”。如果有人知道请留言