barunpuri opened a new issue, #64151:
URL: https://github.com/apache/airflow/issues/64151
### Apache Airflow Provider(s)
fab
### Versions of Apache Airflow Providers
/opt/airflow$ pip freeze | grep providers
apache-airflow-providers-amazon==9.22.0
apache-airflow-providers-celery==3.17.0
apache-airflow-providers-cncf-kubernetes==10.13.0
apache-airflow-providers-common-compat==1.14.0
apache-airflow-providers-common-io==1.7.1
apache-airflow-providers-common-messaging==2.0.2
apache-airflow-providers-common-sql==1.32.0
apache-airflow-providers-docker==4.5.2
apache-airflow-providers-elasticsearch==6.5.0
apache-airflow-providers-fab==3.5.0
apache-airflow-providers-ftp==3.14.1
apache-airflow-providers-git==0.2.4
apache-airflow-providers-google==20.0.0
apache-airflow-providers-grpc==3.9.2
apache-airflow-providers-hashicorp==4.5.0
apache-airflow-providers-http==6.0.0
apache-airflow-providers-microsoft-azure==13.0.0
apache-airflow-providers-mysql==6.5.0
apache-airflow-providers-odbc==4.12.0
apache-airflow-providers-openlineage==2.11.0
apache-airflow-providers-postgres==6.6.0
apache-airflow-providers-redis==4.4.2
apache-airflow-providers-sendgrid==4.2.1
apache-airflow-providers-sftp==5.7.0
apache-airflow-providers-slack==9.7.0
apache-airflow-providers-smtp==2.4.2
apache-airflow-providers-snowflake==6.10.0
apache-airflow-providers-ssh==4.3.1
apache-airflow-providers-standard==1.12.0
### Apache Airflow version
3.1.8
### Operating System
Debian GNU/Linux 12 (bookworm)
### Deployment
Official Apache Airflow Helm Chart
### Deployment details
Use apache/airflow:3.1.8-python3.12 image
### What happened
When running Airflow 3.1.8 with `apache-airflow-providers-fab==3.5.0` (using
Python 3.12), the application fails to handle login requests and throws a 500
Internal Server Error.
Looking at the traceback, it crashes with
`airflow.exceptions.AirflowException: AppBuilder is not initialized.` during
the FastAPI endpoint execution (`/auth/token` or login routes).
I think the error occurs because `auth_manager.register_views()` is called,
which in turn calls `self.security_manager`. However, because the `AppBuilder`
initialization context is not yet fully completed, the `security_manager`
property raises the exception.
**Traceback snippet:**
```python
# ... (previous traceback omitted for brevity)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/auth_manager/cli_commands/utils.py",
line 45, in init_appbuilder
init_appbuilder(app, enable_plugins=False)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/extensions/init_appbuilder.py",
line 606, in init_appbuilder
return AirflowAppBuilder(
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/extensions/init_appbuilder.py",
line 159, in init_app
self.init_app(app, session)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/extensions/init_appbuilder.py",
line 215, in _add_admin_views
self._add_admin_views()
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/www/extensions/init_appbuilder.py",
line 311, in register_views
auth_manager.register_views()
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/auth_manager/fab_auth_manager.py",
line 599, in register_views
self.security_manager.register_views()
File "/usr/python/lib/python3.12/functools.py", line 998, in __get__
val = self.func(instance)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/auth_manager/fab_auth_manager.py",
line 578, in security_manager
raise AirflowException("AppBuilder is not initialized.")
airflow.exceptions.AirflowException: AppBuilder is not initialized.
```
Workaround:
I found that setting `AIRFLOW__FAB__UPDATE_FAB_PERMS=False` bypasses this
issue and allows the server to run successfully.
### What you think should happen instead
The FastAPI application should initialize successfully and serve auth
requests without crashing, even when the default configuration
`update_fab_perms = True` is used.
The internal startup sequence should be fixed so that the `AppBuilder` is
completely instantiated and attached to the context *before* the Auth Manager
attempts to access `self.security_manager` to sync roles or register views.
### How to reproduce
1. Set up an environment with Airflow 3.1.8 and Python 3.12.
2. Install the FAB provider version 3.5.0: `pip install
apache-airflow-providers-fab==3.5.0`
3. Ensure the default configuration for FAB permissions is active (do NOT
set `update_fab_perms = False`).
4. Start the Airflow webserver (FastAPI application).
5. Attempt to hit the login route or `/auth/token` endpoint.
6. Observe the `AppBuilder is not initialized` exception in the api-server
logs.
### Anything else
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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