Wiring config (#516)

* Implement POC

* Implement concept with WiringConfiguration object

* Update changelog

* Add docs

* Update changelog

docs/main/changelog.rst

@@ -11,6 +11,7 @@ Develop
 -------
 - Improve wiring with adding importing modules and packages from a string
   ``container.wire(modules=["yourapp.module1"])``.
+- Add container wiring configuration ``wiring_config = containers.WiringConfiguration()``.
 - Update documentation and fix typos.
 
 4.36.2

docs/wiring.rst

@@ -215,7 +215,7 @@ Method ``container.wire()`` can resolve relative imports:
 
 .. code-block:: python
 
-   # In module "yourapp.foo":
+   # In module "yourapp.main":
 
    container.wire(
        modules=[
@@ -348,6 +348,76 @@ You can use that in testing to re-create and re-wire a container before each tes
 
       module.fn()
 
+Wiring configuration
+--------------------
+
+You can specify wiring configuration in the container. When wiring configuration is defined,
+container will call method ``.wire()`` automatically when you create an instance:
+
+.. code-block:: python
+
+   class Container(containers.DeclarativeContainer):
+
+       wiring_config = containers.WiringConfiguration(
+           modules=[
+               "yourapp.module1",
+               "yourapp.module2",
+           ],
+           packages=[
+               "yourapp.package1",
+               "yourapp.package2",
+           ],
+       )
+
+       ...
+
+
+   if __name__ == "__main__":
+       container = Container()  # container.wire() is called automatically
+       ...
+
+You can also use relative imports. Container will resolve them corresponding
+to the module of the container class:
+
+.. code-block:: python
+
+   # In module "yourapp.container":
+
+   class Container(containers.DeclarativeContainer):
+
+       wiring_config = containers.WiringConfiguration(
+           modules=[
+              ".module1",  # Resolved to: "yourapp.module1"
+              ".module2",  # Resolved to: "yourapp.module2"
+           ],
+       )
+   )
+
+
+   # In module "yourapp.foo.bar.main":
+
+   if __name__ == "__main__":
+       container = Container()  # wire to "yourapp.module1" and "yourapp.module2"
+       ...
+
+To use wiring configuration and call method ``.wire()`` manually, set flag ``auto_wire=False``:
+
+.. code-block:: python
+   :emphasize-lines: 5
+
+   class Container(containers.DeclarativeContainer):
+
+       wiring_config = containers.WiringConfiguration(
+           modules=["yourapp.module1"],
+           auto_wire=False,
+       )
+
+
+   if __name__ == "__main__":
+       container = Container()  # container.wire() is NOT called automatically
+       container.wire()         # wire to "yourapp.module1"
+       ...
+
 .. _async-injections-wiring:
 
 Asynchronous injections

src/dependency_injector/containers.pyi

@@ -3,6 +3,7 @@ from typing import (
     Generic,
     Type,
     Dict,
+    List,
     Tuple,
     Optional,
     Any,
@@ -26,11 +27,20 @@ T = TypeVar('T')
 TT = TypeVar('TT')
 
 
+class WiringConfiguration:
+    modules: List[Any]
+    packages: List[Any]
+    from_package: Optional[str]
+    auto_wire: bool
+    def __init__(self, modules: Optional[Iterable[Any]] = None, packages: Optional[Iterable[Any]] = None, from_package: Optional[str] = None, auto_wire: bool = True) -> None: ...
+
+
 class Container:
     provider_type: Type[Provider] = Provider
     providers: Dict[str, Provider]
     dependencies: Dict[str, Provider]
     overridden: Tuple[Provider]
+    wiring_config: WiringConfiguration
     __self__: Self
     def __init__(self) -> None: ...
     def __deepcopy__(self, memo: Optional[Dict[str, Any]]) -> Provider: ...
@@ -43,6 +53,7 @@ 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
@@ -32,6 +33,19 @@ else:
         raise NotImplementedError('Wiring requires Python 3.6 or above')
 
 
+class WiringConfiguration:
+    """Container wiring configuration."""
+
+    def __init__(self, modules=None, packages=None, from_package=None, auto_wire=True):
+        self.modules = [*modules] if modules else []
+        self.packages = [*packages] if packages else []
+        self.from_package = from_package
+        self.auto_wire = auto_wire
+
+    def __deepcopy__(self, memo=None):
+        return self.__class__(self.modules, self.packages, self.from_package, self.auto_wire)
+
+
 class Container(object):
     """Abstract container."""
 
@@ -77,6 +91,7 @@ class DynamicContainer(Container):
         self.overridden = tuple()
         self.parent = None
         self.declarative_parent = None
+        self.wiring_config = WiringConfiguration()
         self.wired_to_modules = []
         self.wired_to_packages = []
         self.__self__ = providers.Self(self)
@@ -97,6 +112,7 @@ 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():
@@ -251,22 +267,41 @@ class DynamicContainer(Container):
         for provider in six.itervalues(self.providers):
             provider.reset_override()
 
+    def is_auto_wiring_enabled(self):
+        """Check if auto wiring is needed."""
+        return self.wiring_config.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 self.wiring_config.modules:
+            modules = self.wiring_config.modules
+        if packages is None and self.wiring_config.packages:
+            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 self.wiring_config.from_package is not None:
+                    from_package = self.wiring_config.from_package
+                elif self.declarative_parent is not None \
+                        and (self.wiring_config.modules or self.wiring_config.packages):
+                    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)
 
+        if not modules and not packages:
+            return
+
         wire(
             container=self,
             modules=modules,
@@ -463,10 +498,20 @@ class DeclarativeContainerMetaClass(type):
         all_providers.update(inherited_providers)
         all_providers.update(cls_providers)
 
+        wiring_config = attributes.get("wiring_config")
+        if wiring_config is None:
+            wiring_config = WiringConfiguration()
+        if wiring_config is not None and not isinstance(wiring_config, WiringConfiguration):
+            raise errors.Error(
+                "Wiring configuration should be an instance of WiringConfiguration, "
+                "instead got {0}".format(wiring_config)
+            )
+
         attributes['containers'] = containers
         attributes['inherited_providers'] = inherited_providers
         attributes['cls_providers'] = cls_providers
         attributes['providers'] = all_providers
+        attributes['wiring_config'] = wiring_config
 
         cls = <type>type.__new__(mcs, class_name, bases, attributes)
 
@@ -617,6 +662,12 @@ class DeclarativeContainer(Container):
     :type: dict[str, :py:class:`dependency_injector.providers.Provider`]
     """
 
+    wiring_config = WiringConfiguration()
+    """Wiring configuration.
+
+    :type: WiringConfiguration
+    """
+
     cls_providers = dict()
     """Read-only dictionary of current container providers.
 
@@ -649,6 +700,7 @@ 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 +717,9 @@ 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 +881,8 @@ 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

@@ -11,7 +11,7 @@ from dependency_injector.wiring import (
     register_loader_containers,
     unregister_loader_containers,
 )
-from dependency_injector import errors
+from dependency_injector import containers, errors
 
 # Runtime import to avoid syntax errors in samples on Python < 3.5
 import os
@@ -361,6 +361,73 @@ class WiringWithStringModuleAndPackageNamesTest(unittest.TestCase):
         self.assertIsInstance(service, Service)
 
 
+class WiringWithWiringConfigInTheContainerTest(unittest.TestCase):
+
+    container: Container
+    original_wiring_config = Container.wiring_config
+
+    def tearDown(self) -> None:
+        Container.wiring_config = self.original_wiring_config
+        self.container.unwire()
+
+    def test_absolute_names(self):
+        Container.wiring_config = containers.WiringConfiguration(
+            modules=["wiringsamples.module"],
+            packages=["wiringsamples.package"],
+        )
+        self.container = Container()
+
+        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 = containers.WiringConfiguration(
+            modules=[".module"],
+            packages=[".package"],
+            from_package="wiringsamples",
+        )
+        self.container = Container()
+
+        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 = containers.WiringConfiguration(
+            modules=[".module"],
+            packages=[".package"],
+        )
+        self.container = Container()
+
+        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_disabled(self):
+        Container.wiring_config = containers.WiringConfiguration(
+            modules=[".module"],
+            auto_wire=False,
+        )
+        self.container = Container()
+
+        service = module.test_function()
+        self.assertIsInstance(service, Provide)
+
+        self.container.wire()
+        service = module.test_function()
+        self.assertIsInstance(service, Service)
+
+
 class ModuleAsPackageTest(unittest.TestCase):
 
     def setUp(self):