configclasses

Like dataclases but for config.

Specify your config with a class and load it with your env vars or env files.

>>> import httpx
... from configclasses import configclass
>>> class UserAPIClient(httpx.AsyncClient):
...     def __init__(self, config: ClientConfig, *args, **kwargs):
...         self.config = config
...         super().__init__(*args, **kwargs)
... 
...     async def get_users(self, headers: Optional[Headers] = None) -> Dict[str, Any]:
...         response = await self.get(f"{self.path}/users", auth=headers)
...         response.raise_for_status()
...         return response.json()
...     
>>> @configclass
... class ClientConfig:
...     host: str
...     port: int
...
>>> config = ClientConfig.from_path(".env")
... async with UserAPIClient(config) as client:
...     users = await client.get_users(auth_headers)
...   

Features

• Fill your configclasses with existent env vars.
• Define default values in case these variables have no value at all.
• Load your config files in env vars following 12factor apps recommendations.
• Support for .env, yaml, toml, ini and json.
• Convert your env vars with specified type in configclass: int, float, str or bool.
• Use nested configclasses to more complex configurations.
• Specify a prefix with @configclass(prefix="<PREFIX>") to append this prefix to your configclass' attribute names.
• Config groups (TODO): https://cli.dev/docs/tutorial/config_groups/

Requirements

Python 3.8+

Installation

pip install 12factor-configclasses

Supported formats

• .env -> pip install 12factor-configclasses[dotenv]
• .yaml -> pip install 12factor-configclasses[yaml]
• .toml -> pip install 12factor-configclasses[toml]
• .ini
• .json

Install all dependencies with:

pip install 12factor-configclasses[full]

Example

# .env
HOST=0.0.0.0
PORT=8000
DB_URL=sqlite://:memory:
GENERATE_SCHEMAS=True
DEBUG=True
HTTPS_ONLY=False
GZIP=True
SENTRY=False

#config.py
from configclasses import configclass


@configclass
class DB:
    user: str
    password: str
    url: str


@configclass
class AppConfig:
    host: str
    port: int
    db: DB
    generate_schemas: bool
    debug: bool
    https_only: bool
    gzip: bool
    sentry: bool

...
from api.config import AppConfig

app_config = AppConfig.from_path(".env")
app = Starlette(debug=app_config.debug)

if app_config.https_only:
    app.add_middleware(
        HTTPSRedirectMiddleware)
if app_config.gzip:
    app.add_middleware(GZipMiddleware)
if app_config.sentry:
    app.add_middleware(SentryAsgiMiddleware)

...

register_tortoise(
    app,
    db_url=app_config.db.url,
    modules={"models": ["api.models"]},
    generate_schemas=app_config.generate_schemas,
)

if __name__ == "__main__":
    uvicorn.run(app, host=app_config.host, port=app_config.port)