Update examples for aiohttp 3.9 (#943)

Co-authored-by: Sam Bull <git@sambull.org>

demo/flash_messages_example.py

@@ -2,13 +2,12 @@
 from typing import Awaitable, Callable, List, NoReturn, cast
 
 from aiohttp import web
+from aiohttp.typedefs import Handler
 from cryptography import fernet
 
 from aiohttp_session import get_session, setup
 from aiohttp_session.cookie_storage import EncryptedCookieStorage
 
-_Handler = Callable[[web.Request], Awaitable[web.StreamResponse]]
-
 
 def flash(request: web.Request, message: str) -> None:
     request.setdefault("flash_outgoing", []).append(message)
@@ -18,17 +17,16 @@ def get_messages(request: web.Request) -> List[str]:
     return cast(List[str], request.pop("flash_incoming"))
 
 
-async def flash_middleware(app: web.Application, handler: _Handler) -> _Handler:
-    async def process(request: web.Request) -> web.StreamResponse:
-        session = await get_session(request)
-        request["flash_incoming"] = session.pop("flash", [])
-        response = await handler(request)
+@web.middleware
+async def flash_middleware(request: web.Request, handler: Handler) -> web.StreamResponse:
+    session = await get_session(request)
+    request["flash_incoming"] = session.pop("flash", [])
+    try:
+        return await handler(request)
+    finally:
         session["flash"] = request.get("flash_incoming", []) + request.get(
             "flash_outgoing", []
         )
-        return response
-
-    return process
 
 
 async def flash_handler(request: web.Request) -> NoReturn:
@@ -50,10 +48,10 @@ def make_app() -> web.Application:
     fernet_key = fernet.Fernet.generate_key()
     secret_key = base64.urlsafe_b64decode(fernet_key)
     setup(app, EncryptedCookieStorage(secret_key))
+    # Install flash middleware (must be installed after aiohttp-session middleware).
+    app.middlewares.append(flash_middleware)
     app.router.add_get("/", handler)
     app.router.add_get("/flash", flash_handler)
-    # Install flash middleware
-    app.middlewares.append(flash_middleware)
     return app
 
 

demo/login_required_example.py

@@ -13,6 +13,7 @@
 ]
 _Handler = Callable[[web.Request], Awaitable[web.StreamResponse]]
 
+user_key = web.AppKey("user", str)
 
 def login_required(fn: _Handler) -> _Handler:
     async def wrapped(
@@ -29,15 +30,15 @@ async def wrapped(
         user_id = session["user_id"]
         # actually load user from your database (e.g. with aiopg)
         user = DATABASE[user_id]
-        app["user"] = user
+        app[user_key] = user
         return await fn(request, *args, **kwargs)
 
     return wrapped
 
 
 @login_required
 async def handler(request: web.Request) -> web.Response:
-    user = request.app["user"]
+    user = request.app[user_key]
     return web.Response(text=f"User {user} authorized")
 
 

requirements.txt

@@ -1,5 +1,5 @@
 -e .
-aiohttp==3.8.5
+aiohttp==3.9.0
 aiomcache==0.8.1
 cryptography==41.0.5
 docker==6.1.3