container-app-conf

container-app-conf is a library to easily read application values from multiple places like a yaml file and environment variables while providing type validation.

The initial purpose of this library was to have an easy way to configure applications running inside some kind of container (Docker in this case) using environment variables while still provide the possibility to use a more simple form of configuration like a yaml file.

How to use

pip install container-app-conf

Extend Config base

from container_app_conf import Config
from container_app_conf.entry.string import StringConfigEntry

class AppConfig(Config):

    @property
    def config_file_names(self) -> [str]:
        return ["my_app_config_file_name"]

    MY_CONFIG = StringConfigEntry(
        yaml_path=[
            "my_app_config_file_name",
            "example"
        ],
        none_allowed=False)

Config Types

If none of the existing types suit your needs you can easily create your own by extending the ConfigEntry base class.

Default Values

A default value can be specified for every ConfigEntry by using the default constructor parameter.

Allow None

By default a None value is only allowed if the default value is None. This means it is not possible to set the MY_CONFIG entry in the example at the top to None even after initial parsing. Specifying an empty text in the yaml or corresponding environment variable will result in an exception. If you want to allow setting a None value you can use the none_allowed constructor parameter.

Contributing

GitHub is for social coding: if you want to write code, I encourage contributions through pull requests from forks of this repository. Create GitHub tickets for bugs and new features and comment on the ones that you are interested in.

License

container-app-conf
Copyright (c) 2019 Markus Ressel

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.