reintroduce `DoraStatus`

apis/python/node/dora/__init__.py

@@ -26,3 +26,16 @@ from .dora import (
     Ros2Durability,
     Ros2Liveliness,
 )
+
+
+class DoraStatus(Enum):
+    """Dora status to indicate if operator `on_input` loop
+     should be stopped.
+    Args:
+        Enum (u8): Status signaling to dora operator to
+        stop or continue the operator.
+    """
+
+    CONTINUE = 0
+    STOP = 1
+    STOP_ALL = 2

binaries/runtime/src/operator/python.rs

@@ -224,9 +224,8 @@ pub fn run(
                     .map_err(traceback);
                 match status_enum {
                     Ok(status_enum) => {
-                        let status_val =
-                            Python::with_gil(|py| status_enum.call_method0(py, "value"))
-                                .wrap_err("on_event must have enum return value")?;
+                        let status_val = Python::with_gil(|py| status_enum.getattr(py, "value"))
+                            .wrap_err("on_event must have enum return value")?;
                         Python::with_gil(|py| status_val.extract(py))
                             .wrap_err("on_event has invalid return value")
                     }