First commit.

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# JetBrains
+.idea/
+
+# vim
+*.swp
+
+# build
+.dist

LICENSE

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+MIT License
+
+Copyright (c) 2020 DustinMoriarty
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# config-injector
+A simple json configuration dependency injector framework.

config_injector/config/__init__.py

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+import config_injector.config.exc
+from config_injector.config.config import Config, config

config_injector/config/config.py

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+from abc import ABC
+from typing import (Any, Callable, Dict, List, SupportsFloat, SupportsInt,
+                    Text, Tuple, Union)
+
+from config_injector.config.exc import (DoesNotSupportBuild,
+                                        InvalidConfigValue, KeyNotInConfig,
+                                        TypeNotDefined)
+from config_injector.config.utils import get_type
+
+JsonTypes = Union[Dict, List, bool, SupportsInt, SupportsFloat, Text]
+ComponentCallable = Union[Any, Tuple[Any]]
+
+
+class SupportsBuild(ABC):
+    def __build__(self, **kwargs: Dict):
+        ...
+
+
+def build(f: SupportsBuild, config: Dict) -> Any:
+    try:
+        return f.__build__(**config)
+    except AttributeError as e:
+        if not hasattr(f, "__build__"):
+            raise DoesNotSupportBuild(f"{f} does not support build.", e)
+        else:
+            raise e
+
+
+class Config(SupportsBuild):
+    def __init__(self, callback: Callable, **arg_callables: ComponentCallable):
+        """
+        A configurable component containing hints for json parsing.
+
+        :param callback: The function to call. The function should return an object.
+        :param arg_callables: The callables for the arguments to the callback with matching
+           argument names. These callables can be overloaded by providing a tuple.
+        """
+        self.callback = callback
+        self.arg_callables = arg_callables
+
+    def __call__(self, *args, **kwargs) -> Any:
+        return self.callback(*args, **kwargs)
+
+    @property
+    def __name__(self):
+        if hasattr(self.callback, "__name__"):
+            return self.callback.__name__
+        else:
+            raise AttributeError(f"{self.callback} has no attribute {__name__}")
+
+    def get_arg_type(self, arg_name, arg):
+        _arg_tp = self.arg_callables[arg_name]
+        try:
+            type_map = {get_type(x): x for x in _arg_tp}
+        except TypeError:
+            type_map = None
+        if type_map:
+            # Handle "oneOf" types defined with a type property.
+            try:
+                type_name = arg.pop("type")
+            except KeyError:
+                raise KeyNotInConfig(
+                    f"Config key type not found in configuration arguments for {arg_name}"
+                )
+            except TypeError:
+                raise InvalidConfigValue(f"Config value for {arg_name} is invalid.")
+            try:
+                arg_tp = type_map[type_name]
+            except KeyError:
+                raise TypeNotDefined(
+                    f"Configuration type {type_name} not defined for {arg_name}"
+                )
+        else:
+            arg_tp = _arg_tp
+        return arg_tp
+
+    def __build__(self, **kwargs: JsonTypes) -> Any:
+        """
+        Cast data from parsed json prior to calling the callback.
+
+        :param kwargs: Key word arguments consisting of only json types.
+        :return:
+        """
+        kwargs_cast = {}
+        for arg_name, arg in kwargs.items():
+            arg_tp = self.get_arg_type(arg_name, arg)
+            if arg_name in self.arg_callables:
+                if hasattr(arg, "items") and hasattr(arg_tp, "__build__"):
+                    arg_cast = build(arg_tp, arg)
+                else:
+                    arg_cast = arg_tp(arg)
+            else:
+                arg_cast = arg
+            kwargs_cast[arg_name] = arg_cast
+        return self(**kwargs_cast)
+
+
+def config(**arg_callables: ComponentCallable) -> Callable[[], Config]:
+    """
+    Decorator for functions with hints for json decoding.
+
+    :param key: The key to use for the configuration.
+    :param kwargs: The type for each argument in the function f.
+    :return:
+    """
+
+    def wrapper(f) -> Config:
+        _key = get_type(f)
+        component = Config(f, **arg_callables)
+        return component
+
+    return wrapper

config_injector/config/exc.py

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+class ConfigError(Exception):
+    ...
+
+
+class ComponentNotFound(ConfigError):
+    ...
+
+
+class KeyNotInConfig(ConfigError):
+    ...
+
+
+class InvalidConfigKey(ConfigError):
+    ...
+
+
+class TypeNotDefined(ConfigError):
+    ...
+
+
+class AppMergeCollisions(ConfigError):
+    ...
+
+
+class InvalidConfigValue(ConfigError):
+    ...
+
+
+class DoesNotSupportBuild(ConfigError):
+    ...

config_injector/config/utils.py

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+from typing import Callable
+
+
+def get_type(f: Callable):
+    return f.__name__