Flask-Failsafe

A failsafe for the Flask reloader.

.. image:: https://travis-ci.org/mgood/flask-failsafe.png :target: https://travis-ci.org/mgood/flask-failsafe

The Flask reloader works great until you make a syntax error and it fails importing your app. This extension helps keep you working smoothly by catching errors during the initialization of your app, and provides a failsafe fallback app to display those startup errors instead.

To use it, run your app via a small script script with a factory function to initialize your app::

from flask_failsafe import failsafe

@failsafe def create_app(): # note that the import is inside this function so that we can catch # errors that happen at import time from myapp import app return app

if name == "main": create_app().run()

The @failsafe decorator catches any errors calling create_app() and returns a fallback app that will instead display the Flask error debugger.

If you use Flask-Script <http://flask-script.readthedocs.org>_, you can pass the same @failsafe-decorated factory function to the Manager() class::

from flask.ext.script import Manager, Server from flask_failsafe import failsafe

@failsafe def create_app(): from myapp import app return app

manager = Manager(create_app) manager.add_command("runserver", Server())

if name == "main": manager.run()