Add wiring support

src/dependency_injector/providers.pyi

@@ -147,6 +147,7 @@ class ConfigurationOption(Provider[Any]):
     def as_float(self) -> TypedConfigurationOption[float]: ...
     def as_(self, callback: _Callable[..., T], *args: Injection, **kwargs: Injection) -> TypedConfigurationOption[T]: ...
     def required(self) -> ConfigurationOption: ...
+    def is_required(self) -> bool: ...
     def update(self, value: Any) -> None: ...
     def from_ini(self, filepath: Union[Path, str]) -> None: ...
     def from_yaml(self, filepath: Union[Path, str]) -> None: ...

src/dependency_injector/providers.pyx

@@ -1262,6 +1262,9 @@ cdef class ConfigurationOption(Provider):
     def required(self):
         return self.__class__(self.__name, self.__root_ref(), required=True)
 
+    def is_required(self):
+        return self.__required
+
     def override(self, value):
         if isinstance(value, Provider):
             raise Error('Configuration option can only be overridden by a value')

src/dependency_injector/wiring.py

@@ -157,6 +157,9 @@ class ProvidersMap:
             else:
                 new = getattr(new, segment)
 
+        if original.is_required():
+            new = new.required()
+
         if as_:
             new = new.as_(as_)
 

tests/unit/samples/wiringsamples/module.py

@@ -62,6 +62,13 @@ def test_config_value(
     )
 
 
+@inject
+def test_config_value_required_undefined(
+        value_required: int = Provide[Container.config.a.b.c.required()],
+):
+    return value_required
+
+
 @inject
 def test_provide_provider(service_provider: Callable[..., Service] = Provider[Container.service.provider]):
     service = service_provider()

tests/unit/wiring/test_wiring_py36.py

@@ -2,6 +2,7 @@ from decimal import Decimal
 import unittest
 
 from dependency_injector.wiring import wire, Provide, Closing
+from dependency_injector import errors
 
 # Runtime import to avoid syntax errors in samples on Python < 3.5
 import os
@@ -127,6 +128,11 @@ class WiringTest(unittest.TestCase):
         self.assertEqual(value_required_str, '10')
         self.assertEqual(value_required_decimal, Decimal(10))
 
+    def test_configuration_option_required_undefined(self):
+        self.container.config.reset_override()
+        with self.assertRaisesRegex(errors.Error, 'Undefined configuration option "config.a.b.c"'):
+            module.test_config_value_required_undefined()
+
     def test_provide_provider(self):
         service = module.test_provide_provider()
         self.assertIsInstance(service, Service)