bridge (D-Bus): fix BridgeException wrapping

libervia/backend/bridge/bridge_constructor/constructors/dbus/dbus_frontend_template.py

@@ -48,6 +48,8 @@ def dbus_to_bridge_exception(failure):
     @param failure (Failure or RemoteError)
     @return: BridgeException
     """
+    import ast
+
     from twisted.python.failure import Failure
 
     if isinstance(failure, Failure):
@@ -68,7 +70,18 @@ def dbus_to_bridge_exception(failure):
     else:
         name = full_name
 
-    return BridgeException(name, message, "")
+    # The backend GenericException serializes (message, condition) as a tuple string.
+    # Try to unpack it or fall back to using the raw message with no condition.
+    condition = ""
+    try:
+        data = ast.literal_eval(message)
+        if isinstance(data, tuple) and len(data) >= 2:
+            message = data[0]
+            condition = data[1]
+    except (ValueError, SyntaxError):
+        pass
+
+    return BridgeException(name, message, condition)
 
 
 class SignalsHandler:
@@ -334,7 +347,9 @@ class TwistedBridge(bridge):
         @param args(list): arguments
         @param kwargs(dict): keyword arguments (profile, etc.)
         """
-        return super().call(name, *args, **kwargs)
+        d = super().call(name, *args, **kwargs)
+        d.addErrback(self._errback)
+        return d
 
     async def bridge_connect(self) -> None:
         """Connect to the D-Bus bridge."""

libervia/frontends/bridge/dbus_bridge.py

@@ -48,6 +48,8 @@ def dbus_to_bridge_exception(failure):
     @param failure (Failure or RemoteError)
     @return: BridgeException
     """
+    import ast
+
     from twisted.python.failure import Failure
 
     if isinstance(failure, Failure):
@@ -68,7 +70,18 @@ def dbus_to_bridge_exception(failure):
     else:
         name = full_name
 
-    return BridgeException(name, message, "")
+    # The backend GenericException serializes (message, condition) as a tuple string.
+    # Try to unpack it or fall back to using the raw message with no condition.
+    condition = ""
+    try:
+        data = ast.literal_eval(message)
+        if isinstance(data, tuple) and len(data) >= 2:
+            message = data[0]
+            condition = data[1]
+    except (ValueError, SyntaxError):
+        pass
+
+    return BridgeException(name, message, condition)
 
 
 class SignalsHandler:
@@ -996,7 +1009,9 @@ class TwistedBridge(bridge):
         @param args(list): arguments
         @param kwargs(dict): keyword arguments (profile, etc.)
         """
-        return super().call(name, *args, **kwargs)
+        d = super().call(name, *args, **kwargs)
+        d.addErrback(self._errback)
+        return d
 
     async def bridge_connect(self) -> None:
         """Connect to the D-Bus bridge."""