mirror of
https://github.com/Steffo99/cfig.git
synced 2024-11-24 17:04:19 +00:00
101 lines
2.9 KiB
ReStructuredText
101 lines
2.9 KiB
ReStructuredText
#############
|
|
Project goals
|
|
#############
|
|
|
|
The project aims to accomplish multiple goals.
|
|
|
|
|
|
Standards unification
|
|
=====================
|
|
|
|
The first goal is to allow easy integration of an application with multiple configuration standards, such as environment variables, dotenv files, and Docker Secrets files.
|
|
|
|
:mod:`cfig` achieves it by allowing the developers of an application to specify where and how configuration values should be loaded from.
|
|
|
|
.. code-block:: python
|
|
|
|
import cfig
|
|
import cfig.sources
|
|
|
|
config = cfig.Configuration(
|
|
sources=[
|
|
cfig.sources.EnvironmentSource(),
|
|
cfig.sources.EnvironmentSource(prefix="DEV" if __debug__ else "PROD"),
|
|
...
|
|
],
|
|
)
|
|
|
|
|
|
Developer-friendliness
|
|
======================
|
|
|
|
The second goal is to provide a simple and Pythonic interface for developers to define and consume their configuration.
|
|
|
|
:mod:`cfig` tries to achieve that by employing decorators and functions to create a declarative interface.
|
|
|
|
.. code-block:: python
|
|
|
|
@config.required()
|
|
def SECRET_TOKEN(val: str) -> str:
|
|
"""
|
|
The token used to encrypt messages. Keep it secret at all costs!
|
|
"""
|
|
if val.startswith("v1"):
|
|
raise cfig.InvalidValueError("Old token, only v2 tokens are supported")
|
|
elif not val.startswith("v2"):
|
|
raise cfig.InvalidValueError("Unknown token version")
|
|
else:
|
|
return val
|
|
|
|
.. code-block:: python
|
|
|
|
from .mycfig import SECRET_TOKEN
|
|
|
|
print(f"This is my secret token: {SECRET_TOKEN}. Don't mention it to anybody!")
|
|
|
|
|
|
User-friendliness
|
|
=================
|
|
|
|
Another goal is to simplify deployments for system administrators, providing informative error messages and hints to the user configuring the application.
|
|
|
|
:mod:`cfig` does that by providing a CLI displaying all possible configuration keys, their docstrings and their values.
|
|
|
|
.. code-block:: python
|
|
|
|
if __name__ == "__main__":
|
|
config.cli()
|
|
|
|
.. code-block:: console
|
|
|
|
$ python -m mycfig
|
|
===== Configuration =====
|
|
|
|
SECRET_TOKEN → Required, but not set.
|
|
The token used to encrypt messages. Keep it secret at all costs!
|
|
|
|
===== End =====
|
|
$ SECRET_TOKEN="v1:potato" python -m mycfig
|
|
===== Configuration =====
|
|
|
|
SECRET_TOKEN → Old token, only v2 tokens are supported
|
|
The token used to encrypt messages. Keep it secret at all costs!
|
|
|
|
===== End =====
|
|
$ SECRET_TOKEN="v2:qwertyasdf" python -m mycfig
|
|
===== Configuration =====
|
|
|
|
SECRET_TOKEN = "v2:qwertyasdf"
|
|
The token used to encrypt messages. Keep it secret at all costs!
|
|
|
|
===== End =====
|
|
|
|
|
|
Developer hints
|
|
===============
|
|
|
|
The last goal of :mod:`cfig` is having complete and useful typing, so that developer tools may provide correct and useful type hints on configuration values.
|
|
|
|
:mod:`cfig` currently does that, albeit using a few hacks to hide the true nature of configurable values.
|
|
|
|
.. image:: example-typing.png
|