figa 0.1a5

Environment Detection

You can implement your own function that detects where to pull config values from.

@figa.config
class Config:
    development = "~/config.yml"  # use YAML file for config when developing
    production = "env", "cfg_"  # use environment variables with cfg_ prefix in production

    def get_env(self):
        if "ON_HEROKU" in figa.env:  # figa.env is shortcut for os.environ
            return "production"
        else:
            return "development"

>>> config = Config()  # if no environment is passed, get_env() will be called.

File Types

By default, the config file type will be guessed from the file extension. This can also be set explicitly:

@figa.config
class MyConfig:
    example = "ini", "./config.conf"
    # .conf would be detected as HOCON, but we set to INI

Default Values

Default values can be set that will be included on every environment.

@figa.config
class MyConfig:
    default = {"name": "My App"}

    dev = {"host": "localhost"}
    prod = {"host": "myapp.com"}

>>> dev_cfg = MyConfig("dev")
>>> prod_cfg = MyConfig("prod")
>>> dev_cfg.name == prod_cfg.name  # "name" config item is included in both
True

Required Values and Type Checking

In your Config class you can set required values and types that will be checked when the config is loaded. This helps ensure that your code doesn’t run with missing information.

@figa.config
class Config:
    # two required config values: `string` & `sub.number`
    __required__ = {
        "string": str,
        "sub": {
            "number": int
        }
    }

If any values are missing, an error will be raised:

@figa.config
class Config:
    # two required config values: `string` & `sub.number`
    __required__ = {
        "string": str,
        "sub": {
            "number": int
        }
    }

    missing_vals = {  # this config is missing sub.number
        "string": "hello, world",
        "sub": {}
    }

>>> cfg = Config("missing_vals")
ValueError: Missing required item 'sub.number'

Figa will automatically convert strings and numbers for you where possible.

@figa.config
class Config:
    __required__ = {
        "stringval": str,
        "numberval": int
    }

    values = {
        "stringval": 100,
        "numberval": "42"
    }

>>> cfg = Config("values")
>>> cfg.stringval
'100'
>>> cfg.numberval
42

This project is published under the MIT License. See LICENSE.md.