Better declaration of the httpx client

src/digimarks/main.py

@@ -4,7 +4,7 @@ import logging
 from collections.abc import Sequence
 from contextlib import asynccontextmanager
 from datetime import UTC, datetime
-from typing import Annotated
+from typing import Annotated, AsyncGenerator, cast
 
 import httpx
 from fastapi import Depends, FastAPI, HTTPException, Query, Request
@@ -54,22 +54,32 @@ engine = create_async_engine(f'sqlite+aiosqlite:///{settings.database_file}', co
 
 async def get_session() -> AsyncSession:
     """SQLAlchemy session factory."""
-    async_session = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+    async_session = sessionmaker(bind=engine, class_=AsyncSession, expire_on_commit=False)
     async with async_session() as session:
         yield session
 
 
+# Shorter way of getting the DB session in an endpoint
 SessionDep = Annotated[AsyncSession, Depends(get_session)]
 
 
 @asynccontextmanager
-async def lifespan(the_app: FastAPI):
+async def lifespan(the_app: FastAPI) -> AsyncGenerator[None, None]:
     """Upon start, initialise an AsyncClient and assign it to an attribute named requests_client on the app object."""
-    the_app.requests_client = httpx.AsyncClient()
+    async with httpx.AsyncClient() as requests_client:
+        the_app.state.requests_client = requests_client
         yield
-    await the_app.requests_client.aclose()
+        await the_app.state.requests_client.aclose()
 
 
+async def get_requests_client(request: Request) -> httpx.AsyncClient:
+    """Get the httpx client from the application object."""
+    return cast(httpx.AsyncClient, request.app.state.requests_client)
+
+
+# Shorter way of getting the httpx client in an endpoint
+RequestsDep = Annotated[AsyncSession, Depends(get_requests_client)]
+
 app = FastAPI(lifespan=lifespan)
 app.mount('/static', StaticFiles(directory=settings.static_dir), name='static')
 app.mount('/content/favicons', StaticFiles(directory=settings.favicons_dir), name='favicons')