Fix Closing dependency resolution

src/dependency_injector/wiring.py

@@ -598,14 +598,14 @@ def _locate_dependent_closing_args(provider: providers.Provider) -> Dict[str, pr
         return {}
 
     closing_deps = {}
-    for arg in provider.args:
+    for arg in [*provider.args, *provider.kwargs.values()]:
         if not isinstance(arg, providers.Provider) or not hasattr(arg, "args"):
             continue
-
-        if not arg.args and isinstance(arg, providers.Resource):
+        if isinstance(arg, providers.Resource):
             return {str(id(arg)): arg}
-        else:
-            closing_deps += _locate_dependent_closing_args(arg)
+        if arg.args or arg.kwargs:
+            closing_deps |= _locate_dependent_closing_args(arg)
+
     return closing_deps
 
 

tests/unit/samples/wiringstringids/resourceclosing.py

@@ -2,17 +2,24 @@
 from dependency_injector.wiring import inject, Provide, Closing
 
 
+class Singleton:
+    pass
+
+
 class Service:
     init_counter: int = 0
     shutdown_counter: int = 0
+    dependency: Singleton = None
 
     @classmethod
     def reset_counter(cls):
         cls.init_counter = 0
         cls.shutdown_counter = 0
 
     @classmethod
-    def init(cls):
+    def init(cls, dependency: Singleton = None):
+        if dependency:
+            cls.dependency = dependency
         cls.init_counter += 1
 
     @classmethod
@@ -25,17 +32,49 @@ def __init__(self, service: Service):
         self.service = service
 
 
+class NestedService:
+    def __init__(self, factory_service: FactoryService):
+        self.factory_service = factory_service
+
+
 def init_service():
     service = Service()
     service.init()
     yield service
     service.shutdown()
 
 
+def init_service_with_singleton(singleton: Singleton):
+    service = Service()
+    service.init(singleton)
+    yield service
+    service.shutdown()
+
+
 class Container(containers.DeclarativeContainer):
 
     service = providers.Resource(init_service)
     factory_service = providers.Factory(FactoryService, service)
+    factory_service_kwargs = providers.Factory(
+        FactoryService,
+        service=service
+    )
+    nested_service = providers.Factory(NestedService, factory_service)
+
+
+class ContainerSingleton(containers.DeclarativeContainer):
+
+    singleton = providers.Resource(Singleton)
+    service = providers.Resource(
+        init_service_with_singleton,
+        singleton
+    )
+    factory_service = providers.Factory(FactoryService, service)
+    factory_service_kwargs = providers.Factory(
+        FactoryService,
+        service=service
+    )
+    nested_service = providers.Factory(NestedService, factory_service)
 
 
 @inject
@@ -46,3 +85,15 @@ def test_function(service: Service = Closing[Provide["service"]]):
 @inject
 def test_function_dependency(factory: FactoryService = Closing[Provide["factory_service"]]):
     return factory
+
+
+@inject
+def test_function_dependency_kwargs(factory: FactoryService = Closing[Provide["factory_service_kwargs"]]):
+    return factory
+
+
+@inject
+def test_function_nested_dependency(
+    nested: NestedService = Closing[Provide["nested_service"]]
+):
+    return nested

tests/unit/wiring/string_ids/test_main_py36.py

@@ -33,9 +33,9 @@ def subcontainer():
     container.unwire()
 
 
-@fixture
-def resourceclosing_container():
-    container = resourceclosing.Container()
+@fixture(params=[resourceclosing.Container, resourceclosing.ContainerSingleton])
+def resourceclosing_container(request):
+    container = request.param()
     container.wire(modules=[resourceclosing])
     yield container
     container.unwire()
@@ -303,6 +303,36 @@ def test_closing_dependency_resource():
     assert result_2.service.init_counter == 2
     assert result_2.service.shutdown_counter == 2
 
+
+@mark.usefixtures("resourceclosing_container")
+def test_closing_dependency_resource_kwargs():
+    resourceclosing.Service.reset_counter()
+
+    result_1 = resourceclosing.test_function_dependency_kwargs()
+    assert isinstance(result_1, resourceclosing.FactoryService)
+    assert result_1.service.init_counter == 1
+    assert result_1.service.shutdown_counter == 1
+
+    result_2 = resourceclosing.test_function_dependency_kwargs()
+    assert isinstance(result_2, resourceclosing.FactoryService)
+    assert result_2.service.init_counter == 2
+    assert result_2.service.shutdown_counter == 2
+
+
+@mark.usefixtures("resourceclosing_container")
+def test_closing_nested_dependency_resource():
+    resourceclosing.Service.reset_counter()
+
+    result_1 = resourceclosing.test_function_nested_dependency()
+    assert isinstance(result_1, resourceclosing.NestedService)
+    assert result_1.factory_service.service.init_counter == 1
+    assert result_1.factory_service.service.shutdown_counter == 1
+
+    result_2 = resourceclosing.test_function_nested_dependency()
+    assert isinstance(result_2, resourceclosing.NestedService)
+    assert result_2.factory_service.service.init_counter == 2
+    assert result_2.factory_service.service.shutdown_counter == 2
+
     assert result_1 is not result_2