Implement string imports for wiring

src/dependency_injector/containers.pyi

@@ -43,7 +43,7 @@ class Container:
     def override_providers(self, **overriding_providers: Union[Provider, Any]) -> None: ...
     def reset_last_overriding(self) -> None: ...
     def reset_override(self) -> None: ...
-    def wire(self, modules: Optional[Iterable[Any]] = None, packages: Optional[Iterable[Any]] = None) -> None: ...
+    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]: ...
     def shutdown_resources(self) -> Optional[Awaitable]: ...

src/dependency_injector/containers.pyx

@@ -1,7 +1,9 @@
 """Containers module."""
-
+import contextlib
 import json
 import sys
+import importlib
+import inspect
 
 try:
     import asyncio
@@ -248,11 +250,22 @@ class DynamicContainer(Container):
         for provider in six.itervalues(self.providers):
             provider.reset_override()
 
-    def wire(self, modules=None, packages=None):
+    def wire(self, modules=None, packages=None, from_package=None):
         """Wire container providers with provided packages and modules.
 
         :rtype: None
         """
+        modules = [*modules] if modules else []
+        packages = [*packages] if packages else []
+
+        if from_package is None and \
+                (_has_any_relative_string_imports(modules) or _has_any_relative_string_imports(packages)):
+            with contextlib.suppress(Exception):
+                from_package = _resolve_calling_package_name()
+
+        modules = _resolve_string_imports(modules, from_package)
+        packages = _resolve_string_imports(packages, from_package)
+
         wire(
             container=self,
             modules=modules,
@@ -261,7 +274,6 @@ class DynamicContainer(Container):
 
         if modules:
             self.wired_to_modules.extend(modules)
-
         if packages:
             self.wired_to_packages.extend(packages)
 
@@ -789,3 +801,27 @@ cpdef object _check_provider_type(object container, object provider):
     if not isinstance(provider, container.provider_type):
         raise errors.Error('{0} can contain only {1} '
                            'instances'.format(container, container.provider_type))
+
+
+cpdef bint _has_any_relative_string_imports(object modules):
+    for module in modules:
+        if not isinstance(module, str):
+            continue
+        if module.startswith("."):
+            return True
+    else:
+        return False
+
+
+cpdef list _resolve_string_imports(object modules, object from_package):
+    return [
+        importlib.import_module(module, from_package) if isinstance(module, str) else module
+        for module in modules
+    ]
+
+
+cpdef object _resolve_calling_package_name():
+    stack = inspect.stack()
+    pre_last_frame = stack[0]
+    module = inspect.getmodule(pre_last_frame[0])
+    return module.__package__

src/dependency_injector/wiring.py

@@ -322,20 +322,15 @@ class InspectFilter:
 def wire(  # noqa: C901
         container: Container,
         *,
-        modules: Optional[Iterable[Union[ModuleType, str]]] = None,
-        packages: Optional[Iterable[Union[ModuleType, str]]] = None,
-        from_package: Optional[str] = None,
+        modules: Optional[Iterable[ModuleType]] = None,
+        packages: Optional[Iterable[ModuleType]] = None,
 ) -> None:
     """Wire container providers with provided packages and modules."""
-    if not modules:
-        modules = []
-    modules = _resolve_string_imports(modules, from_package)
+    modules = [*modules] if modules else []
 
-    if not packages:
-        packages = []
-    packages = _resolve_string_imports(packages, from_package)
-    for package in packages:
-        modules.extend(_fetch_modules(package))
+    if packages:
+        for package in packages:
+            modules.extend(_fetch_modules(package))
 
     providers_map = ProvidersMap(container)
 
@@ -372,8 +367,7 @@ def unwire(  # noqa: C901
         packages: Optional[Iterable[ModuleType]] = None,
 ) -> None:
     """Wire provided packages and modules with previous wired providers."""
-    if not modules:
-        modules = []
+    modules = [*modules] if modules else []
 
     if packages:
         for package in packages:
@@ -677,16 +671,6 @@ def _is_declarative_container(instance: Any) -> bool:
             and getattr(instance, 'declarative_parent', None) is None)
 
 
-def _resolve_string_imports(
-        modules: Optional[Iterable[Union[ModuleType, str]]],
-        from_package: Optional[str],
-) -> List[ModuleType]:
-    return [
-        importlib.import_module(module, from_package) if isinstance(module, str) else module
-        for module in modules
-    ]
-
-
 class Modifier:
 
     def modify(

tests/unit/samples/wiringsamples/wire_relative_string_names.py

@@ -0,0 +1,8 @@
+"""Wiring sample package."""
+
+
+def wire_with_relative_string_names(container):
+    container.wire(
+        modules=[".module"],
+        packages=[".package"],
+    )

tests/unit/wiring/test_wiring_py36.py

@@ -36,6 +36,7 @@ from asyncutils import AsyncTestCase
 from wiringsamples import module, package
 from wiringsamples.service import Service
 from wiringsamples.container import Container, SubContainer
+from wiringsamples.wire_relative_string_names import wire_with_relative_string_names
 
 
 class WiringTest(unittest.TestCase):
@@ -314,6 +315,52 @@ class WiringTest(unittest.TestCase):
         self.assertIsInstance(service, Service)
 
 
+class WiringWithStringModuleAndPackageNamesTest(unittest.TestCase):
+
+    container: Container
+
+    def setUp(self) -> None:
+        self.container = Container()
+        self.addCleanup(self.container.unwire)
+
+    def test_absolute_names(self):
+        self.container.wire(
+            modules=["wiringsamples.module"],
+            packages=["wiringsamples.package"],
+        )
+
+        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):
+        self.container.wire(
+            modules=[".module"],
+            packages=[".package"],
+            from_package="wiringsamples",
+        )
+
+        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):
+        wire_with_relative_string_names(self.container)
+
+        service = module.test_function()
+        self.assertIsInstance(service, Service)
+
+        from wiringsamples.package.subpackage.submodule import test_function
+        service = test_function()
+        self.assertIsInstance(service, Service)
+
+
 class ModuleAsPackageTest(unittest.TestCase):
 
     def setUp(self):