Implement POC

src/dependency_injector/containers.pyi

@@ -31,6 +31,7 @@ class Container:
     providers: Dict[str, Provider]
     dependencies: Dict[str, Provider]
     overridden: Tuple[Provider]
+    wiring_config: Dict[str, Any]
     __self__: Self
     def __init__(self) -> None: ...
     def __deepcopy__(self, memo: Optional[Dict[str, Any]]) -> Provider: ...
@@ -43,6 +44,7 @@ class Container:
     def override_providers(self, **overriding_providers: Union[Provider, Any]) -> None: ...
     def reset_last_overriding(self) -> None: ...
     def reset_override(self) -> None: ...
+    def is_auto_wiring_enabled(self) -> bool: ...
     def wire(self, modules: Optional[Iterable[Any]] = None, packages: Optional[Iterable[Any]] = None, from_package: Optional[str] = None) -> None: ...
     def unwire(self) -> None: ...
     def init_resources(self) -> Optional[Awaitable]: ...

src/dependency_injector/containers.pyx

@@ -1,6 +1,7 @@
 """Containers module."""
 
 import contextlib
+import copy as copy_module
 import json
 import sys
 import importlib
@@ -77,6 +78,7 @@ class DynamicContainer(Container):
         self.overridden = tuple()
         self.parent = None
         self.declarative_parent = None
+        self.wiring_config = {}
         self.wired_to_modules = []
         self.wired_to_packages = []
         self.__self__ = providers.Self(self)
@@ -97,6 +99,7 @@ class DynamicContainer(Container):
 
         copied.provider_type = providers.Provider
         copied.overridden = providers.deepcopy(self.overridden, memo)
+        copied.wiring_config = copy_module.deepcopy(self.wiring_config, memo)
         copied.declarative_parent = self.declarative_parent
 
         for name, provider in providers.deepcopy(self.providers, memo).items():
@@ -251,18 +254,35 @@ class DynamicContainer(Container):
         for provider in six.itervalues(self.providers):
             provider.reset_override()
 
+    def is_auto_wiring_enabled(self):
+        """Check if auto wiring is enabled."""
+        return self.wiring_config.get("auto_wire") is True
+
     def wire(self, modules=None, packages=None, from_package=None):
         """Wire container providers with provided packages and modules.
 
         :rtype: None
         """
+        if modules is None and "modules" in self.wiring_config:
+            modules = self.wiring_config["modules"]
+        if packages is None and "packages" in self.wiring_config:
+            packages = self.wiring_config["packages"]
+
         modules = [*modules] if modules else []
         packages = [*packages] if packages else []
 
         if _any_relative_string_imports_in(modules) or _any_relative_string_imports_in(packages):
             if from_package is None:
-                with contextlib.suppress(Exception):
-                    from_package = _resolve_calling_package_name()
+                if "from_package" in self.wiring_config:
+                    from_package = self.wiring_config["from_package"]
+                elif self.declarative_parent is not None \
+                        and ("modules" in self.wiring_config
+                             or "packages" in self.wiring_config):
+                    with contextlib.suppress(Exception):
+                        from_package = _resolve_package_name_from_cls(self.declarative_parent)
+                else:
+                    with contextlib.suppress(Exception):
+                        from_package = _resolve_calling_package_name()
 
         modules = _resolve_string_imports(modules, from_package)
         packages = _resolve_string_imports(packages, from_package)
@@ -467,6 +487,7 @@ class DeclarativeContainerMetaClass(type):
         attributes['inherited_providers'] = inherited_providers
         attributes['cls_providers'] = cls_providers
         attributes['providers'] = all_providers
+        attributes['wiring_config'] = attributes.get('wiring_config', {})
 
         cls = <type>type.__new__(mcs, class_name, bases, attributes)
 
@@ -617,6 +638,12 @@ class DeclarativeContainer(Container):
     :type: dict[str, :py:class:`dependency_injector.providers.Provider`]
     """
 
+    wiring_config = dict()
+    """Dictionary of wiring configuration.
+
+    :type: dict[str, Any]
+    """
+
     cls_providers = dict()
     """Read-only dictionary of current container providers.
 
@@ -649,6 +676,7 @@ class DeclarativeContainer(Container):
         """
         container = cls.instance_type()
         container.provider_type = cls.provider_type
+        container.wiring_config = copy_module.deepcopy(cls.wiring_config)
         container.declarative_parent = cls
 
         copied_providers = providers.deepcopy({ **cls.providers, **{'@@self@@': cls.__self__}})
@@ -665,6 +693,9 @@ class DeclarativeContainer(Container):
         container.override_providers(**overriding_providers)
         container.apply_container_providers_overridings()
 
+        if container.is_auto_wiring_enabled():
+            container.wire()
+
         return container
 
     @classmethod
@@ -826,3 +857,8 @@ cpdef object _resolve_calling_package_name():
     pre_last_frame = stack[0]
     module = inspect.getmodule(pre_last_frame[0])
     return module.__package__
+
+
+cpdef object _resolve_package_name_from_cls(cls):
+    module = importlib.import_module(cls.__module__)
+    return module.__package__

tests/unit/wiring/test_wiring_py36.py

@@ -30,6 +30,7 @@ _SAMPLES_DIR = os.path.abspath(
 import sys
 sys.path.append(_TOP_DIR)
 sys.path.append(_SAMPLES_DIR)
+import copy
 
 from asyncutils import AsyncTestCase
 
@@ -361,6 +362,74 @@ class WiringWithStringModuleAndPackageNamesTest(unittest.TestCase):
         self.assertIsInstance(service, Service)
 
 
+class WiringWithWiringConfigInTheContainerTest(unittest.TestCase):
+
+    container: Container
+    original_wiring_config = copy.deepcopy(Container.wiring_config)
+
+    def tearDown(self) -> None:
+        Container.wiring_config = copy.deepcopy(self.original_wiring_config)
+        self.container.unwire()
+
+    def test_absolute_names(self):
+        Container.wiring_config = {
+            "modules": ["wiringsamples.module"],
+            "packages": ["wiringsamples.package"],
+        }
+        self.container = Container()
+        self.container.wire()
+
+        service = module.test_function()
+        self.assertIsInstance(service, Service)
+
+        from wiringsamples.package.subpackage.submodule import test_function
+        service = test_function()
+        self.assertIsInstance(service, Service)
+
+    def test_relative_names_with_explicit_package(self):
+        Container.wiring_config = {
+            "modules": [".module"],
+            "packages": [".package"],
+            "from_package": "wiringsamples",
+        }
+        self.container = Container()
+        self.container.wire()
+
+        service = module.test_function()
+        self.assertIsInstance(service, Service)
+
+        from wiringsamples.package.subpackage.submodule import test_function
+        service = test_function()
+        self.assertIsInstance(service, Service)
+
+    def test_relative_names_with_auto_package(self):
+        Container.wiring_config = {
+            "modules": [".module"],
+            "packages": [".package"],
+        }
+        self.container = Container()
+        self.container.wire()
+
+        service = module.test_function()
+        self.assertIsInstance(service, Service)
+
+        from wiringsamples.package.subpackage.submodule import test_function
+        service = test_function()
+        self.assertIsInstance(service, Service)
+
+    def test_auto_wire(self):
+        Container.wiring_config = {
+            "modules": [".module"],
+            "auto_wire": True,
+        }
+        self.container = Container()
+
+        service = module.test_function()
+        self.assertIsInstance(service, Service)
+
+        self.assertTrue(self.container.is_auto_wiring_enabled())
+
+
 class ModuleAsPackageTest(unittest.TestCase):
 
     def setUp(self):