A failsafe for the Flask reloader
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 @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, 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()
Python 3 support (thanks to Asger Drewsen for the help)