# configclasses
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Like dataclasses but for config.
Specify your config with a class and load it with your env vars or env files.
```python
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](https://12factor.net) 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
Depending on your chosen config file format you can install:
- .env -> ```pip install 12factor-configclasses[dotenv]```
- .yaml -> ```pip install 12factor-configclasses[yaml]```
- .toml -> ```pip install 12factor-configclasses[toml]```
- .ini -> ```pip install 12factor-configclasses```
- .json -> ```pip install 12factor-configclasses```
Or install all supported formats with:
pip install 12factor-configclasses[full]
## Usage
There are three ways to use it:
- Loading an .env file:
```.env
# .env
HOST=0.0.0.0
PORT=8000
DB_URL=sqlite://:memory:
GENERATE_SCHEMAS=True
DEBUG=True
HTTPS_ONLY=False
GZIP=True
SENTRY=False
```
```python
#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
```
```python
# app.py
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)
```
- Loading predefined environmental variables:
The same than before, but instead of:
app_config = AppConfig.from_path(".env")
You will do:
app_config = AppConfig.from_environ()
- Loading a file from a string:
```python
test_env = """HOST=0.0.0.0
PORT=8000
DB_URL=sqlite://:memory:
GENERATE_SCHEMAS=True
DEBUG=True
HTTPS_ONLY=False
GZIP=True
SENTRY=False"""
app_config = AppConfig.from_string(test_env, ".env")
```