Add wiring hotfix for fastapi

src/dependency_injector/wiring.py

@@ -316,13 +316,15 @@ def _get_patched(fn, injections, closing):
     def _patched(*args, **kwargs):
         to_inject = kwargs.copy()
         for injection, provider in injections.items():
-            if injection not in kwargs:
+            if injection not in kwargs \
+                    or _is_fastapi_default_arg_injection(injection, kwargs):
                 to_inject[injection] = provider()
 
         result = fn(*args, **to_inject)
 
         for injection, provider in closing.items():
-            if injection in kwargs:
+            if injection in kwargs \
+                    and not _is_fastapi_default_arg_injection(injection, kwargs):
                 continue
             if not isinstance(provider, providers.Resource):
                 continue
@@ -337,13 +339,15 @@ def _get_async_patched(fn, injections, closing):
     async def _patched(*args, **kwargs):
         to_inject = kwargs.copy()
         for injection, provider in injections.items():
-            if injection not in kwargs:
+            if injection not in kwargs \
+                    or _is_fastapi_default_arg_injection(injection, kwargs):
                 to_inject[injection] = provider()
 
         result = await fn(*args, **to_inject)
 
         for injection, provider in closing.items():
-            if injection in kwargs:
+            if injection in kwargs \
+                    and not _is_fastapi_default_arg_injection(injection, kwargs):
                 continue
             if not isinstance(provider, providers.Resource):
                 continue
@@ -353,6 +357,11 @@ def _get_async_patched(fn, injections, closing):
     return _patched
 
 
+def _is_fastapi_default_arg_injection(injection, kwargs):
+    """Check if injection is FastAPI injection of the default argument."""
+    return injection in kwargs and isinstance(kwargs[injection], _Marker)
+
+
 def _is_patched(fn):
     return getattr(fn, '__wired__', False) is True
 

tests/unit/wiring/test_wiring_py36.py

@@ -1,7 +1,7 @@
 from decimal import Decimal
 import unittest
 
-from dependency_injector.wiring import wire, Provide
+from dependency_injector.wiring import wire, Provide, Closing
 
 # Runtime import to avoid syntax errors in samples on Python < 3.5
 import os
@@ -225,3 +225,41 @@ class WiringTest(unittest.TestCase):
         self.assertIs(result_2, service)
         self.assertEqual(result_2.init_counter, 0)
         self.assertEqual(result_2.shutdown_counter, 0)
+
+
+class WiringAndFastAPITest(unittest.TestCase):
+
+    container: Container
+
+    def test_bypass_marker_injection(self):
+        container = Container()
+        container.wire(modules=[module])
+        self.addCleanup(container.unwire)
+
+        service = module.test_function(service=Provide[Container.service])
+        self.assertIsInstance(service, Service)
+
+    def test_closing_resource_bypass_marker_injection(self):
+        from wiringsamples import resourceclosing
+
+        resourceclosing.Service.reset_counter()
+
+        container = resourceclosing.Container()
+        container.wire(modules=[resourceclosing])
+        self.addCleanup(container.unwire)
+
+        result_1 = resourceclosing.test_function(
+            service=Closing[Provide[resourceclosing.Container.service]],
+        )
+        self.assertIsInstance(result_1, resourceclosing.Service)
+        self.assertEqual(result_1.init_counter, 1)
+        self.assertEqual(result_1.shutdown_counter, 1)
+
+        result_2 = resourceclosing.test_function(
+            service=Closing[Provide[resourceclosing.Container.service]],
+        )
+        self.assertIsInstance(result_2, resourceclosing.Service)
+        self.assertEqual(result_2.init_counter, 2)
+        self.assertEqual(result_2.shutdown_counter, 2)
+
+        self.assertIsNot(result_1, result_2)