Updated dependency overrides.

Signed-off-by: Pavel Kirilin <[email protected]>

README.md

@@ -7,7 +7,7 @@
 
 This project was initially created to show the abillities of [taskiq-dependencies](https://github.com/taskiq-python/taskiq-dependencies) project, which is used by [taskiq](https://github.com/taskiq-python/taskiq) to provide you with the best experience of sending distributed tasks.
 
-This project adds [FastAPI](https://github.com/tiangolo/fastapi)-like dependency injection to your [AioHTTP](https://github.com/aio-libs/aiohttp) application.
+This project adds [FastAPI](https://github.com/tiangolo/fastapi)-like dependency injection to your [AioHTTP](https://github.com/aio-libs/aiohttp) application and swagger documentation based on types.
 
 To start using dependency injection, just initialize the injector.
 
@@ -362,8 +362,8 @@ async def my_handler(var: str = Depends(Path())):
 Sometimes for tests you don't want to calculate actual functions
 and you want to pass another functions instead.
 
-To do so, you can add "dependency_overrides" key to the aplication.
-It's a dict that is passed as additional context to dependency resolvers.
+To do so, you can add "dependency_overrides" or "values_overrides" to the aplication's state.
+These values should be dicts.
 
 Here's an example.
 
@@ -385,5 +385,19 @@ where you create your application. And make sure that keys
 of that dict are actual function that are being replaced.
 
 ```python
-    my_app["dependency_overrides"] = {original_dep: 2}
+    my_app["values_overrides"] = {original_dep: 2}
 ```
+
+But `values_overrides` only overrides values. If you want to
+override functions, you have to use `dependency_overrides`. Here's an example:
+
+```python
+def replacing_function() -> int:
+    return 2
+
+
+my_app["dependency_overrides"] = {original_dep: replacing_function}
+```
+
+The cool point about `dependency_overrides`, is that it recalculates graph and
+you can use dependencies in function that replaces the original.

aiohttp_deps/initializer.py

@@ -44,8 +44,9 @@ async def __call__(self, request: web.Request) -> web.StreamResponse:
             {
                 web.Request: request,
                 web.Application: request.app,
-                **request.app.get("dependency_overrides", {}),
+                **request.app.get("values_overrides", {}),
             },
+            replaced_deps=request.app.get("dependency_overrides"),
         ) as resolver:
             return await self.original_handler(**(await resolver.resolve_kwargs()))
 

aiohttp_deps/view.py

@@ -43,7 +43,8 @@ async def _iter(self) -> StreamResponse:
             {
                 web.Request: self.request,
                 web.Application: self.request.app,
-                **self.request.app.get("dependency_overrides", {}),
+                **self.request.app.get("values_overrides", {}),
             },
+            replaced_deps=self.request.app.get("dependency_overrides"),
         ) as ctx:
             return await method(**(await ctx.resolve_kwargs()))  # type: ignore

tests/test_func_dependencies.py

@@ -37,6 +37,26 @@ async def handler(app: web.Application = Depends()):
     assert "Application" in (await resp.json())["request"]
 
 
+@pytest.mark.anyio
+async def test_values_override(
+    my_app: web.Application,
+    aiohttp_client: ClientGenerator,
+):
+    def original_dep() -> int:
+        return 1
+
+    async def handler(num: int = Depends(original_dep)):
+        return web.json_response({"request": num})
+
+    my_app.router.add_get("/", handler)
+    my_app["values_overrides"] = {original_dep: 2}
+
+    client = await aiohttp_client(my_app)
+    resp = await client.get("/")
+    assert resp.status == 200
+    assert (await resp.json())["request"] == 2
+
+
 @pytest.mark.anyio
 async def test_dependency_override(
     my_app: web.Application,
@@ -45,11 +65,14 @@ async def test_dependency_override(
     def original_dep() -> int:
         return 1
 
+    def custom_dep() -> int:
+        return 2
+
     async def handler(num: int = Depends(original_dep)):
         return web.json_response({"request": num})
 
     my_app.router.add_get("/", handler)
-    my_app["dependency_overrides"] = {original_dep: 2}
+    my_app["dependency_overrides"] = {original_dep: custom_dep}
 
     client = await aiohttp_client(my_app)
     resp = await client.get("/")

tests/test_view_dependencies.py

@@ -55,6 +55,28 @@ async def get(self):
     assert resp.status == 405
 
 
+@pytest.mark.anyio
+async def test_values_override(
+    my_app: web.Application,
+    aiohttp_client: ClientGenerator,
+):
+    def original_dep() -> int:
+        return 1
+
+    class MyView(View):
+        async def get(self, num: int = Depends(original_dep)):
+            """Nothing."""
+            return web.json_response({"request": num})
+
+    my_app.router.add_view("/", MyView)
+    my_app["values_overrides"] = {original_dep: 2}
+
+    client = await aiohttp_client(my_app)
+    resp = await client.get("/")
+    assert resp.status == 200
+    assert (await resp.json())["request"] == 2
+
+
 @pytest.mark.anyio
 async def test_dependency_override(
     my_app: web.Application,
@@ -63,13 +85,16 @@ async def test_dependency_override(
     def original_dep() -> int:
         return 1
 
+    def replaced() -> int:
+        return 2
+
     class MyView(View):
         async def get(self, num: int = Depends(original_dep)):
             """Nothing."""
             return web.json_response({"request": num})
 
     my_app.router.add_view("/", MyView)
-    my_app["dependency_overrides"] = {original_dep: 2}
+    my_app["dependency_overrides"] = {original_dep: replaced}
 
     client = await aiohttp_client(my_app)
     resp = await client.get("/")