[IMP] fastapi: Factorize error handling and use it in tests with rais…

…e_server_exceptions=False

fastapi/error_handlers.py

@@ -1,14 +1,55 @@
 # Copyright 2022 ACSONE SA/NV
 # License LGPL-3.0 or later (http://www.gnu.org/licenses/LGPL).
 
-
-from starlette.exceptions import WebSocketException
+from starlette import status
+from starlette.exceptions import HTTPException, WebSocketException
 from starlette.middleware.errors import ServerErrorMiddleware
 from starlette.middleware.exceptions import ExceptionMiddleware
 from starlette.responses import JSONResponse
 from starlette.websockets import WebSocket
+from werkzeug.exceptions import HTTPException as WerkzeugHTTPException
+
+from odoo.exceptions import AccessDenied, AccessError, MissingError, UserError
 
 from fastapi import Request
+from fastapi.encoders import jsonable_encoder
+from fastapi.exceptions import RequestValidationError, WebSocketRequestValidationError
+from fastapi.utils import is_body_allowed_for_status_code
+
+
+def convert_exception_to_status_body(exc: Exception) -> tuple[int, dict]:
+    body = {}
+    status_code = status.HTTP_500_INTERNAL_SERVER_ERROR
+    details = "Internal Server Error"
+
+    if isinstance(exc, WerkzeugHTTPException):
+        status_code = exc.code
+        details = exc.description
+    elif isinstance(exc, HTTPException):
+        status_code = exc.status_code
+        details = exc.detail
+    elif isinstance(exc, RequestValidationError):
+        status_code = status.HTTP_422_UNPROCESSABLE_ENTITY
+        details = jsonable_encoder(exc.errors())
+    elif isinstance(exc, WebSocketRequestValidationError):
+        status_code = status.WS_1008_POLICY_VIOLATION
+        details = jsonable_encoder(exc.errors())
+    elif isinstance(exc, AccessDenied | AccessError):
+        status_code = status.HTTP_403_FORBIDDEN
+        details = "AccessError"
+    elif isinstance(exc, MissingError):
+        status_code = status.HTTP_404_NOT_FOUND
+        details = "MissingError"
+    elif isinstance(exc, UserError):
+        status_code = status.HTTP_400_BAD_REQUEST
+        details = exc.args[0]
+
+    if is_body_allowed_for_status_code(status_code):
+        # use the same format as in
+        # fastapi.exception_handlers.http_exception_handler
+        body = {"detail": details}
+    return status_code, body
+
 
 # we need to monkey patch the ServerErrorMiddleware and ExceptionMiddleware classes
 # to ensure that all the exceptions that are handled by these specific

fastapi/fastapi_dispatcher.py

@@ -4,18 +4,10 @@
 from contextlib import contextmanager
 from io import BytesIO
 
-from starlette import status
-from starlette.exceptions import HTTPException
-from werkzeug.exceptions import HTTPException as WerkzeugHTTPException
-
-from odoo.exceptions import AccessDenied, AccessError, MissingError, UserError
 from odoo.http import Dispatcher, request
 
-from fastapi.encoders import jsonable_encoder
-from fastapi.exceptions import RequestValidationError, WebSocketRequestValidationError
-from fastapi.utils import is_body_allowed_for_status_code
-
 from .context import odoo_env_ctx
+from .error_handlers import convert_exception_to_status_body
 
 
 class FastApiDispatcher(Dispatcher):
@@ -47,34 +39,7 @@ def dispatch(self, endpoint, args):
 
     def handle_error(self, exc):
         headers = getattr(exc, "headers", None)
-        status_code = status.HTTP_500_INTERNAL_SERVER_ERROR
-        details = "Internal Server Error"
-        if isinstance(exc, WerkzeugHTTPException):
-            status_code = exc.code
-            details = exc.description
-        elif isinstance(exc, HTTPException):
-            status_code = exc.status_code
-            details = exc.detail
-        elif isinstance(exc, RequestValidationError):
-            status_code = status.HTTP_422_UNPROCESSABLE_ENTITY
-            details = jsonable_encoder(exc.errors())
-        elif isinstance(exc, WebSocketRequestValidationError):
-            status_code = status.WS_1008_POLICY_VIOLATION
-            details = jsonable_encoder(exc.errors())
-        elif isinstance(exc, AccessDenied | AccessError):
-            status_code = status.HTTP_403_FORBIDDEN
-            details = "AccessError"
-        elif isinstance(exc, MissingError):
-            status_code = status.HTTP_404_NOT_FOUND
-            details = "MissingError"
-        elif isinstance(exc, UserError):
-            status_code = status.HTTP_400_BAD_REQUEST
-            details = exc.args[0]
-        body = {}
-        if is_body_allowed_for_status_code(status_code):
-            # use the same format as in
-            # fastapi.exception_handlers.http_exception_handler
-            body = {"detail": details}
+        status_code, body = convert_exception_to_status_body(exc)
         return self.request.make_json_response(
             body, status=status_code, headers=headers
         )

fastapi/tests/common.py

@@ -1,10 +1,15 @@
 # Copyright 2023 ACSONE SA/NV
 # License LGPL-3.0 or later (http://www.gnu.org/licenses/LGPL).
+import logging
 from collections.abc import Callable
 from contextlib import contextmanager
 from functools import partial
 from typing import Any
 
+from starlette import status
+from starlette.requests import Request
+from starlette.responses import JSONResponse, Response
+
 from odoo.api import Environment
 from odoo.tests import tagged
 from odoo.tests.common import TransactionCase
@@ -20,6 +25,25 @@
     authenticated_partner_impl,
     optionally_authenticated_partner_impl,
 )
+from ..error_handlers import convert_exception_to_status_body
+
+_logger = logging.getLogger(__name__)
+
+
+def default_exception_handler(request: Request, exc: Exception) -> Response:
+    """
+    Default exception handler that returns a response with the exception details.
+    """
+    status_code, body = convert_exception_to_status_body(exc)
+
+    if status_code == status.HTTP_500_INTERNAL_SERVER_ERROR:
+        # In testing we want to see the exception details of 500 errors
+        _logger.error("[%d] Error occurred: %s", exc_info=exc)
+
+    return JSONResponse(
+        status_code=status_code,
+        content=body,
+    )
 
 
 @tagged("post_install", "-at_install")
@@ -125,6 +149,11 @@ def _create_test_client(
         if router:
             app.include_router(router)
         app.dependency_overrides = dependencies
+
+        if not raise_server_exceptions:
+            # Handle exceptions as in FastAPIDispatcher
+            app.exception_handlers.setdefault(Exception, default_exception_handler)
+
         ctx_token = odoo_env_ctx.set(env)
         testclient_kwargs = testclient_kwargs or {}
         try:

fastapi/tests/test_fastapi_demo.py

@@ -5,11 +5,13 @@
 
 from requests import Response
 
+from odoo.exceptions import UserError
+
 from fastapi import status
 
 from ..dependencies import fastapi_endpoint
 from ..routers import demo_router
-from ..schemas import DemoEndpointAppInfo
+from ..schemas import DemoEndpointAppInfo, DemoExceptionType
 from .common import FastAPITransactionCase
 
 
@@ -61,3 +63,46 @@ def test_endpoint_info(self) -> None:
             response.json(),
             DemoEndpointAppInfo.model_validate(demo_app).model_dump(by_alias=True),
         )
+
+    def test_exception_raised(self) -> None:
+        with self.assertRaisesRegex(UserError, "User Error"):
+            with self._create_test_client() as test_client:
+                test_client.get(
+                    "/demo/exception",
+                    params={
+                        "exception_type": DemoExceptionType.user_error.value,
+                        "error_message": "User Error",
+                    },
+                )
+        with self.assertRaisesRegex(NotImplementedError, "Bare Exception"):
+            with self._create_test_client() as test_client:
+                test_client.get(
+                    "/demo/exception",
+                    params={
+                        "exception_type": DemoExceptionType.bare_exception.value,
+                        "error_message": "Bare Exception",
+                    },
+                )
+
+    def test_exception_not_raised(self) -> None:
+        with self._create_test_client(raise_server_exceptions=False) as test_client:
+            response: Response = test_client.get(
+                "/demo/exception",
+                params={
+                    "exception_type": DemoExceptionType.user_error.value,
+                    "error_message": "User Error",
+                },
+            )
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertDictEqual(response.json(), {"detail": "User Error"})
+
+        with self._create_test_client(raise_server_exceptions=False) as test_client:
+            response: Response = test_client.get(
+                "/demo/exception",
+                params={
+                    "exception_type": DemoExceptionType.bare_exception.value,
+                    "error_message": "Bare Exception",
+                },
+            )
+        self.assertEqual(response.status_code, status.HTTP_500_INTERNAL_SERVER_ERROR)
+        self.assertDictEqual(response.json(), {"detail": "Internal Server Error"})