lundybernard / batconf

Application configuration tool from the BAT project
MIT License
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BatConf

Configuration Management for Python projects, modules, applications, and microservices.

Stable Version Downloads Build Status

Python 3.8 Python 3.9 Python 3.10 Python 3.11 Python 3.12

Compose structured hierarchical configurations from multiple sources. Enable your code to adapt seemlessly to the current context. Allow users in different contexts to use the config source that works best for them.

Users can create their own config sources by creating classes that satisfy batconf.source.SourceInterfaceProto (or subclass batconf.source.SourceInterface)

The config lookup order is determined by the SourceList instance, which can be adjusted to suit your needs.

Professional Support

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Get supported BatConf with the Tidelift subscription

Example Configuration

Most projects can copy this example with minimal modification.

from bat import GlobalConfig

from batconf.manager import Configuration, ConfigProtocol

from batconf.source import SourceList
from batconf.sources.args import CliArgsConfig, Namespace
from batconf.sources.env import EnvConfig
from batconf.sources.file import FileConfig
from batconf.sources.dataclass import DataclassConfig

def get_config(
    # Known issue: https://github.com/python/mypy/issues/4536
    config_class: ConfigProtocol = GlobalConfig,  # type: ignore
    cli_args: Namespace = None,
    config_file: FileConfig = None,
    config_file_name: str = None,
    config_env: str = None,
) -> Configuration:

    # Build a prioritized config source list
    config_sources = [
        CliArgsConfig(cli_args) if cli_args else None,
        EnvConfig(),
        config_file if config_file else FileConfig(
            config_file_name, config_env=config_env
        ),
        DataclassConfig(config_class),
    ]

    source_list = SourceList(config_sources)

    return Configuration(source_list, config_class)

GlobalConfig and Config classes

the GlobalConfig class is a python dataclass, used for namespacing, and providing a structured configuration tree. Its attributes should be other Config dataclasses for sub-modules.

from dataclasses import dataclass
from .example import Config

@dataclass
class GlobalConfig:
    # example module with configuration dataclass
    example: Config

Install Instructions

pip install .

Install with Poetry

install poetry >= 1.1.13

poetry install

Manual install

install the dev dependencies listed in pyproject.toml

Dev Guide

Install dev dependencies (pytest, mypy, etc)

pip install -e .[dev]

macos/zsh:

pip install -e ".[dev]"

Design Principles

Security contact information

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.