Return generic error on non-binded exception in method callback

src/sdbus/dbus_proxy_async_method.py

@@ -146,6 +146,13 @@ async def _call_from_dbus(
             )
             error_message.send()
             return
+        except Exception:
+            error_message = request_message.create_error_reply(
+                DbusFailedError.dbus_error_name,
+                "",
+            )
+            error_message.send()
+            return
 
         if not request_message.expect_reply:
             return

test/test_high_level_errors.py

@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+# Copyright (C) 2020-2022 igo95862
+
+# This file is part of python-sdbus
+
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+from __future__ import annotations
+
+from asyncio import get_running_loop, wait_for
+from typing import Any
+
+from sdbus.unittest import IsolatedDbusTestCase
+
+from sdbus import (
+    DbusFailedError,
+    DbusInterfaceCommonAsync,
+    dbus_method_async,
+    request_default_bus_name_async,
+)
+
+HELLO_WORLD = 'Hello, world!'
+
+
+class DbusDeriveMethodError(DbusFailedError):
+    dbus_error_name = 'org.example.Method.Error'
+
+
+class IndependentError(Exception):
+    ...
+
+
+GOOD_STR = 'Good'
+
+
+class InterfaceWithErrors(
+    DbusInterfaceCommonAsync,
+    interface_name='org.example.test',
+):
+
+    @dbus_method_async(result_signature='s')
+    async def hello_independent_error(self) -> str:
+        raise IndependentError
+
+    @dbus_method_async(result_signature='s')
+    async def hello_derrived_error(self) -> str:
+        raise DbusDeriveMethodError
+
+
+class TestHighLevelErrors(IsolatedDbusTestCase):
+    async def asyncSetUp(self) -> None:
+        await super().asyncSetUp()
+
+        await request_default_bus_name_async('org.test')
+        self.test_object = InterfaceWithErrors()
+        self.test_object.export_to_dbus('/')
+
+        self.test_object_connection = InterfaceWithErrors.new_proxy(
+            'org.test', '/')
+
+        loop = get_running_loop()
+
+        def silence_exceptions(*args: Any, **kwrags: Any) -> None:
+            ...
+
+        loop.set_exception_handler(silence_exceptions)
+
+    async def test_method_indenendent_error(self) -> None:
+        with self.assertRaises(DbusFailedError) as cm:
+            await wait_for(
+                self.test_object_connection.hello_independent_error(),
+                timeout=1,
+            )
+
+        exception = cm.exception
+        self.assertIs(exception.__class__, DbusFailedError)
+
+    async def test_method_derived_error(self) -> None:
+        with self.assertRaises(DbusDeriveMethodError):
+            await wait_for(
+                self.test_object_connection.hello_derrived_error(),
+                timeout=1,
+            )