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A failsafe for the Flask reloader

Project description


A failsafe for the Flask reloader.

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

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__":

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, 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

def create_app():
  from myapp import app
  return app

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

if __name__ == "__main__":


0.2 (2014-01-03)

Python 3 support (thanks to Asger Drewsen for the help)

0.1 (2012-09-14)

Initial release

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