example/custom/di/src/di/static_test.py

@@ -1,9 +1,10 @@
 from cpl.dependency import ServiceProvider, ServiceProviderABC
+from cpl.dependency.inject import inject
 from di.test_service import TestService
 
 
 class StaticTest:
     @staticmethod
-    @ServiceProvider.inject
+    @inject
     def test(services: ServiceProviderABC, t1: TestService):
         t1.run()

src/cpl-api/cpl/api/application/web_app.py

@@ -27,6 +27,7 @@ from cpl.api.settings import ApiSettings
 from cpl.api.typing import HTTPMethods, PartialMiddleware, PolicyResolver
 from cpl.application.abc.application_abc import ApplicationABC
 from cpl.core.configuration import Configuration
+from cpl.dependency.inject import inject
 from cpl.dependency.service_provider_abc import ServiceProviderABC
 
 
@@ -44,15 +45,15 @@ class WebApp(ApplicationABC):
         self._policies = services.get_service(PolicyRegistry)
         self._routes = services.get_service(RouteRegistry)
 
-        self._middleware: list[Middleware] = [
+        self._middleware: list[Middleware] = []
-            Middleware(RequestMiddleware),
-            Middleware(LoggingMiddleware),
-        ]
         self._exception_handlers: Mapping[Any, ExceptionHandler] = {
             Exception: self._handle_exception,
             APIError: self._handle_exception,
         }
 
+        self.with_middleware(RequestMiddleware)
+        self.with_middleware(LoggingMiddleware)
+
     async def _handle_exception(self, request: Request, exc: Exception):
         if isinstance(exc, APIError):
             self._logger.error(exc)
@@ -168,9 +169,9 @@ class WebApp(ApplicationABC):
         self._check_for_app()
 
         if isinstance(middleware, Middleware):
-            self._middleware.append(middleware)
+            self._middleware.append(inject(middleware))
         elif callable(middleware):
-            self._middleware.append(Middleware(middleware))
+            self._middleware.append(Middleware(inject(middleware)))
         else:
             raise ValueError("middleware must be of type starlette.middleware.Middleware or a callable")
 
@@ -220,7 +221,7 @@ class WebApp(ApplicationABC):
         self._validate_policies()
 
         if self._app is None:
-            routes = [route.to_starlette(self._services.inject) for route in self._routes.all()]
+            routes = [route.to_starlette(inject) for route in self._routes.all()]
 
             app = Starlette(
                 routes=routes,

src/cpl-api/cpl/api/middleware/authentication.py

@@ -9,12 +9,10 @@ from cpl.api.router import Router
 from cpl.auth.keycloak import KeycloakClient
 from cpl.auth.schema import AuthUserDao, AuthUser
 from cpl.core.ctx import set_user
-from cpl.dependency import ServiceProviderABC
 
 
 class AuthenticationMiddleware(ASGIMiddleware):
 
-    @ServiceProviderABC.inject
     def __init__(self, app, logger: APILogger, keycloak: KeycloakClient, user_dao: AuthUserDao):
         ASGIMiddleware.__init__(self, app)
 

src/cpl-api/cpl/api/middleware/authorization.py

@@ -9,12 +9,10 @@ from cpl.api.registry.policy import PolicyRegistry
 from cpl.api.router import Router
 from cpl.auth.schema._administration.auth_user_dao import AuthUserDao
 from cpl.core.ctx.user_context import get_user
-from cpl.dependency.service_provider_abc import ServiceProviderABC
 
 
 class AuthorizationMiddleware(ASGIMiddleware):
 
-    @ServiceProviderABC.inject
     def __init__(self, app, logger: APILogger, policies: PolicyRegistry, user_dao: AuthUserDao):
         ASGIMiddleware.__init__(self, app)
 

src/cpl-api/cpl/api/middleware/logging.py

@@ -6,12 +6,10 @@ from starlette.types import Receive, Scope, Send
 from cpl.api.abc.asgi_middleware_abc import ASGIMiddleware
 from cpl.api.logger import APILogger
 from cpl.api.middleware.request import get_request
-from cpl.dependency import ServiceProviderABC
 
 
 class LoggingMiddleware(ASGIMiddleware):
 
-    @ServiceProviderABC.inject
     def __init__(self, app, logger: APILogger):
         ASGIMiddleware.__init__(self, app)
 

src/cpl-api/cpl/api/middleware/request.py

@@ -9,14 +9,12 @@ from starlette.types import Scope, Receive, Send
 from cpl.api.abc.asgi_middleware_abc import ASGIMiddleware
 from cpl.api.logger import APILogger
 from cpl.api.typing import TRequest
-from cpl.dependency import ServiceProviderABC
 
 _request_context: ContextVar[Union[TRequest, None]] = ContextVar("request", default=None)
 
 
 class RequestMiddleware(ASGIMiddleware):
 
-    @ServiceProviderABC.inject
     def __init__(self, app, logger: APILogger):
         ASGIMiddleware.__init__(self, app)
 

src/cpl-application/cpl/application/application_builder.py

@@ -7,6 +7,7 @@ from cpl.application.abc.startup_abc import StartupABC
 from cpl.application.abc.startup_extension_abc import StartupExtensionABC
 from cpl.application.host import Host
 from cpl.core.errors import dependency_error
+from cpl.dependency.context import get_current_provider, use_root_provider
 from cpl.dependency.service_collection import ServiceCollection
 
 TApp = TypeVar("TApp", bound=ApplicationABC)
@@ -21,6 +22,7 @@ class ApplicationBuilder(Generic[TApp]):
         self._app = app if app is not None else ApplicationABC
 
         self._services = ServiceCollection()
+        use_root_provider(self._services.build())
 
         self._startup: Optional[StartupABC] = None
         self._app_extensions: list[Type[ApplicationExtensionABC]] = []
@@ -34,7 +36,12 @@ class ApplicationBuilder(Generic[TApp]):
 
     @property
     def service_provider(self):
-        return self._services.build()
+        provider = get_current_provider()
+        if provider is None:
+            provider = self._services.build()
+            use_root_provider(provider)
+
+        return provider
 
     def validate_app_required_modules(self, app: ApplicationABC):
         for module in app.required_modules:

src/cpl-core/cpl/core/log/wrapped_logger.py

@@ -3,6 +3,7 @@ from typing import Type
 
 from cpl.core.log import LoggerABC, LogLevel
 from cpl.core.typing import Messages
+from cpl.dependency.inject import inject
 from cpl.dependency.service_provider_abc import ServiceProviderABC
 
 
@@ -17,7 +18,7 @@ class WrappedLogger(LoggerABC):
 
         self._set_logger()
 
-    @ServiceProviderABC.inject
+    @inject
     def _set_logger(self, services: ServiceProviderABC):
         from cpl.core.log import Logger
 

src/cpl-dependency/cpl/dependency/__init__.py

@@ -1,3 +1,5 @@
+from .context import get_current_provider, use_provider
+from .inject import inject
 from .scope import Scope
 from .scope_abc import ScopeABC
 from .service_collection import ServiceCollection

src/cpl-dependency/cpl/dependency/context.py

@@ -0,0 +1,21 @@
+import contextvars
+from contextlib import contextmanager
+
+_current_provider = contextvars.ContextVar("current_provider", default=None)
+
+
+def use_root_provider(provider):
+    _current_provider.set(provider)
+
+
+@contextmanager
+def use_provider(provider):
+    token = _current_provider.set(provider)
+    try:
+        yield
+    finally:
+        _current_provider.reset(token)
+
+
+def get_current_provider():
+    return _current_provider.get()

src/cpl-dependency/cpl/dependency/inject.py

@@ -0,0 +1,42 @@
+import functools
+from asyncio import iscoroutinefunction
+from inspect import signature
+
+from cpl.dependency.context import get_current_provider
+
+
+def inject(f=None):
+    if f is None:
+        return functools.partial(inject)
+
+    if iscoroutinefunction(f):
+
+        @functools.wraps(f)
+        async def async_inner(*args, **kwargs):
+            from cpl.dependency.service_provider import ServiceProvider
+
+            provider: ServiceProvider | None = get_current_provider()
+            if provider is None:
+                raise ValueError(
+                    "No provider in current context. Use 'with use_provider(provider):' to set the provider in the current context."
+                )
+
+            injection = [x for x in provider._build_by_signature(signature(f)) if x is not None]
+            return await f(*args, *injection, **kwargs)
+
+        return async_inner
+
+    @functools.wraps(f)
+    def inner(*args, **kwargs):
+        from cpl.dependency.service_provider import ServiceProvider
+
+        provider: ServiceProvider | None = get_current_provider()
+        if provider is None:
+            raise ValueError(
+                "No provider in current context. Use 'with use_provider(provider):' to set the provider in the current context."
+            )
+
+        injection = [x for x in provider._build_by_signature(signature(f)) if x is not None]
+        return f(*args, *injection, **kwargs)
+
+    return inner

src/cpl-dependency/cpl/dependency/service_provider_abc.py

@@ -1,9 +1,8 @@
-import functools
 from abc import abstractmethod, ABC
-from inspect import Signature, signature, iscoroutinefunction
+from inspect import Signature
 from typing import Optional, Type
 
-from cpl.core.typing import T, R
+from cpl.core.typing import T
 from cpl.dependency.scope_abc import ScopeABC
 
 
@@ -126,40 +125,3 @@ class ServiceProviderABC(ABC):
         -------
             Object of type list[:class:`type`]
         """
-
-    @classmethod
-    def inject(cls, f=None):
-        r"""Decorator to allow injection into static and class methods
-
-        Parameter
-        ---------
-            f: Callable
-
-        Returns
-        -------
-            function
-        """
-        if f is None:
-            return functools.partial(cls.inject)
-
-        if iscoroutinefunction(f):
-
-            @functools.wraps(f)
-            async def async_inner(*args, **kwargs):
-                if cls._provider is None:
-                    raise Exception(f"{cls.__name__} not build!")
-
-                injection = [x for x in cls._provider._build_by_signature(signature(f)) if x is not None]
-                return await f(*args, *injection, **kwargs)
-
-            return async_inner
-
-        @functools.wraps(f)
-        def inner(*args, **kwargs):
-            if cls._provider is None:
-                raise Exception(f"{cls.__name__} not build!")
-
-            injection = [x for x in cls._provider._build_by_signature(signature(f)) if x is not None]
-            return f(*args, *injection, **kwargs)
-
-        return inner