[responses] use a wrapper function for exception handling (fix starlette 0.20)

halfapi/halfapi.py

@@ -35,7 +35,7 @@ from .lib.timing import HTimingClient
 from .lib.jwt_middleware import JWTAuthenticationBackend
 from .lib.responses import (ORJSONResponse, UnauthorizedResponse,
     NotFoundResponse, InternalServerErrorResponse, NotImplementedResponse,
-    ServiceUnavailableResponse)
+    ServiceUnavailableResponse, gen_exception_route)
 from .lib.domain import NoDomainsException
 from .lib.routes import gen_schema_routes, JSONRoute
 from .lib.schemas import schema_json
@@ -90,11 +90,11 @@ class HalfAPI(Starlette):
             debug=not PRODUCTION,
             routes=routes,
             exception_handlers={
-                401: UnauthorizedResponse,
-                404: NotFoundResponse,
-                500: HalfAPI.exception,
-                501: NotImplementedResponse,
-                503: ServiceUnavailableResponse
+                401: gen_exception_route(UnauthorizedResponse),
+                404: gen_exception_route(NotFoundResponse),
+                500: gen_exception_route(HalfAPI.exception),
+                501: gen_exception_route(NotImplementedResponse),
+                503: gen_exception_route(ServiceUnavailableResponse)
             },
             on_startup=startup_fcts
         )

halfapi/lib/responses.py

@@ -24,6 +24,8 @@ import orjson
 
 # asgi framework
 from starlette.responses import PlainTextResponse, Response, JSONResponse, HTMLResponse
+from starlette.requests import Request
+from starlette.exceptions import HTTPException
 
 from .user import JWTUser, Nobody
 from ..logging import logger
@@ -157,3 +159,9 @@ class ODSResponse(Response):
 
 class XLSXResponse(ODSResponse):
     file_type = 'xlsx'
+
+def gen_exception_route(response_cls):
+    async def exception_route(req: Request, exc: HTTPException):
+        return response_cls()
+
+    return exception_route