Fix broken wiring of sync inject-decorated methods

src/dependency_injector/_cwiring.pyx

@@ -2,44 +2,39 @@
 
 import asyncio
 import collections.abc
-import functools
 import inspect
 import types
 
-from . import providers
-from .wiring import _Marker, PatchedCallable
+from .wiring import _Marker
 
-from .providers cimport Provider
+from .providers cimport Provider, Resource
 
 
-def _get_sync_patched(fn, patched: PatchedCallable):
-    @functools.wraps(fn)
-    def _patched(*args, **kwargs):
-        cdef object result
-        cdef dict to_inject
-        cdef object arg_key
-        cdef Provider provider
+def _sync_inject(object fn, tuple args, dict kwargs, dict injections, dict closings, /):
+    cdef object result
+    cdef dict to_inject
+    cdef object arg_key
+    cdef Provider provider
 
-        to_inject = kwargs.copy()
-        for arg_key, provider in patched.injections.items():
-            if arg_key not in kwargs or isinstance(kwargs[arg_key], _Marker):
-                to_inject[arg_key] = provider()
+    to_inject = kwargs.copy()
+    for arg_key, provider in injections.items():
+        if arg_key not in kwargs or isinstance(kwargs[arg_key], _Marker):
+            to_inject[arg_key] = provider()
 
-        result = fn(*args, **to_inject)
+    result = fn(*args, **to_inject)
 
-        if patched.closing:
-            for arg_key, provider in patched.closing.items():
-                if arg_key in kwargs and not isinstance(kwargs[arg_key], _Marker):
-                    continue
-                if not isinstance(provider, providers.Resource):
-                    continue
-                provider.shutdown()
+    if closings:
+        for arg_key, provider in closings.items():
+            if arg_key in kwargs and not isinstance(kwargs[arg_key], _Marker):
+                continue
+            if not isinstance(provider, Resource):
+                continue
+            provider.shutdown()
 
-        return result
-    return _patched
+    return result
 
 
-async def _async_inject(object fn, tuple args, dict kwargs, dict injections, dict closings):
+async def _async_inject(object fn, tuple args, dict kwargs, dict injections, dict closings, /):
     cdef object result
     cdef dict to_inject
     cdef list to_inject_await = []
@@ -69,7 +64,7 @@ async def _async_inject(object fn, tuple args, dict kwargs, dict injections, dic
         for arg_key, provider in closings.items():
             if arg_key in kwargs and isinstance(kwargs[arg_key], _Marker):
                 continue
-            if not isinstance(provider, providers.Resource):
+            if not isinstance(provider, Resource):
                 continue
             shutdown = provider.shutdown()
             if _isawaitable(shutdown):

src/dependency_injector/wiring.py

@@ -1030,7 +1030,7 @@ def is_loader_installed() -> bool:
 _loader = AutoLoader()
 
 # Optimizations
-from ._cwiring import _get_sync_patched  # noqa
+from ._cwiring import _sync_inject  # noqa
 from ._cwiring import _async_inject  # noqa
 
 
@@ -1047,4 +1047,17 @@ async def _patched(*args, **kwargs):
             patched.closing,
         )
 
-    return _patched
+    return cast(F, _patched)
+
+
+def _get_sync_patched(fn: F, patched: PatchedCallable) -> F:
+    @functools.wraps(fn)
+    def _patched(*args, **kwargs):
+        return _sync_inject(
+            fn,
+            args,
+            kwargs,
+            patched.injections,
+            patched.closing,
+        )
+    return cast(F, _patched)

tests/unit/wiring/test_introspection_py36.py

@@ -6,6 +6,13 @@
 from dependency_injector.wiring import inject
 
 
+def test_isfunction():
+    @inject
+    def foo(): ...
+
+    assert inspect.isfunction(foo)
+
+
 def test_asyncio_iscoroutinefunction():
     @inject
     async def foo():