Flask Appconfigure

Flask Appconfigure is a simple and lightweight module which simplifies the concept of creating and configuring Flask Applications in an Object-Oriented Way.

Installation

You can install Flask Appconfigure from this Github repository with python3 setup.py install, or just install it directly from pypi with pip3 install flask-appconfigure.

Get Started

BaseConfigurator

Flask Appconfigure uses the concept of Configurators. Each configurator should do exactly one configuration. To create a custom configurator, simply subclass from BaseConfigurator and implement the configure method. Inside the configure method, you have access to the Flask Application through self.app:

from flask_appconfigure import BaseConfigurator

class DummyConfigurator(BaseConfigurator):
    ExitOnError = False

    def configure(self):
        self.app.before_request(lambda: print("before request"))

To configure wether a raised exception should abort the whole configuration process or not, you can set the ExitOnError attribute of your own configurator to True or False. The default is True.

ConfiguratorPool

To use your own configurators, you will need an instance of a ConfiguratorPool. There you can add your configurators in exactly the same order as they are then executed.

from flask_appconfigure import ConfiguratorPool, BaseConfigurator

class DummyConfigurator2(BaseConfigurator):
    def configure(self, environment="dev"):
        pass

pool = ConfiguratorPool()
pool.add_configurator(DummyConfigurator)
pool.add_configurator(DummyConfigurator2)

When configuring your Flask Application, the DummyConfigurator gets executed first, then DummyConfigurator2.

To pass further arguments to the configure method of your configurator, you can use the optional arguments args and kwargs in ConfiguratorPool.add_configurator.

pool.add_configurator(DummyConfigurator2, kwargs={"environment": "test"})

ApplicationFactory

The ApplicationFactory brings all the pieces together and actually executes your configurators.

from flask_appconfigure import ApplicationFactory

factory = ApplicationFactory(pool)
app = factory.create_app(template_folder='my_template_folder')

You can also pass any parameters to the create_app function as you would to the flask.Flask() constructor. If no parameters are passed, the flask app is created using flask.Flask(__name__).

Alternatively, if you already have a flask.Flask object and only need to configure it using your ConfigurationPool, you can use the factory.configure_app(app) method.