def __init__(self, msg: QDBusMessage) -> None:
assert msg.type() == QDBusMessage.ErrorMessage
self.error = msg.errorName()
self.error_message = msg.errorMessage()
self.is_fatal = self.error not in self._NON_FATAL_ERRORS
text = f"{self.error}: {self.error_message}"
super().__init__(text)
def _verify_message(
self,
msg: QDBusMessage,
expected_signature: str,
expected_type: QDBusMessage.MessageType,
) -> None:
"""Check the signature/type of a received message.
Raises DBusError if the signature doesn't match.
"""
assert expected_type not in [
QDBusMessage.ErrorMessage,
QDBusMessage.InvalidMessage,
], expected_type
if msg.type() == QDBusMessage.ErrorMessage:
err = msg.errorName()
if err == "org.freedesktop.DBus.Error.NoReply":
self.error.emit(
msg.errorMessage()) # notification daemon is gone
return
raise Error(f"Got DBus error: {err} - {msg.errorMessage()}")
signature = msg.signature()
if signature != expected_signature:
raise Error(
f"Got a message with signature {signature} but expected "
f"{expected_signature} (args: {msg.arguments()})")
typ = msg.type()
if typ != expected_type:
type_str = debug.qenum_key(QDBusMessage.MessageType, typ)
expected_type_str = debug.qenum_key(QDBusMessage.MessageType,
expected_type)
raise Error(
f"Got a message of type {type_str} but expected {expected_type_str}"
f"(args: {msg.arguments()})")
