Declarative and extensible library for configuration & code separation

Last update: Dec 7, 2022

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Overview

ClassyConf

ClassyConf is the configuration architecture solution for perfectionists with deadlines.

It provides a declarative way to define settings for your projects contained in a class that can be extended, overriden at runtime, config objects can be passed around modules and settings are lazily loaded, plus some other goodies.

You can find out more documentation at Read the Docs website, and the intro post here to understand the motivations behind it.

Here is a preview of how to use it:

from classyconf import Configuration, Value, Environment, IniFile, as_boolean, EnvPrefix

class AppConfig(Configuration):
    """Configuration for My App"""
    class Meta:
        loaders = [
            Environment(keyfmt=EnvPrefix("MY_APP_")),
            IniFile("/etc/app/conf.ini", section="myapp")
        ]

    DEBUG = Value(default=False, cast=as_boolean, help="Toggle debugging mode.")
    DATABASE_URL = Value(default="postgres://localhost:5432/mydb", help="Database connection.")

Later this object can be used to print settings

>>> config = AppConfig()
>>> print(config)
DEBUG=True - Toggle debugging mode.
DATABASE_URL='postgres://localhost:5432/mydb' - Database connection.

or with __repr__()

>>> config = AppConfig()
>>> config
AppConf(loaders=[Environment(keyfmt=EnvPrefix("MY_APP_"), EnvFile("main.env")])

extended

class TestConfig(AppConfig):
    class Meta:
        loaders = [IniFile("test_settings.ini"), EnvFile("main.env")]

overridden at runtime

>>> dev_config = AppConfig(loaders=[IniFile("dev_settings.ini")])
>>> dev_config.DEBUG
True

accessed as dict or object

>>> config.DEBUG
False
>>> config["DEBUG"]
False

iterated

 >>> for setting in config:
...     print(setting)
...
('DEBUG', Value(key="DEBUG", help="Toggle debugging on/off."))
('DATABASE_URL', Value(key="DATABASE_URL", help="Database connection."))

or passed around

def do_something(cfg):
    if cfg.DEBUG:   # this is evaluated lazily
         return

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Comments

CommandLine is not exposed / Documentation not correct
In the init.py the CommandLine loader and ClassyConf class are not exposed, making the CommandLine class not visible.

The documentation from the commandline example requires this https://classyconf.readthedocs.io/en/latest/loaders.html#commandline

Error:

>>> from classyconf import ClassyConf, Value, NOT_SET, CommandLine Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: cannot import name 'ClassyConf' from 'classyconf' (/home/roel/python/lib/python3.9/site-packages/classyconf/__init__.py)

Tested with ClassyConf version 0.3.0
bug
opened by RoelAdriaans 2
Bump certifi from 2021.5.30 to 2022.12.7
Bumps certifi from 2021.5.30 to 2022.12.7.

Commits

9e9e840 2022.12.07

b81bdb2 2022.09.24

939a28f 2022.09.14

aca828a 2022.06.15.2

de0eae1 Only use importlib.resources's new files() / Traversable API on Python ≥3.11 ...

b8eb5e9 2022.06.15.1

47fb7ab Fix deprecation warning on Python 3.11 (#199)

b0b48e0 fixes #198 -- update link in license

9d514b4 2022.06.15

4151e88 Add py.typed to MANIFEST.in to package in sdist (#196)

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dependencies
opened by dependabot[bot] 0
Feature request - load configuration from HashiCorp Vault

This is slightly a different case for loaders since it is not local but we use Vault \ Secrets Manager to hold configuration data such as DB URL, password, etc (which are different per env).
question

opened by tomron 1