feat(on_exception): register new controller event for monitoring exceptions

Author: jourdain

README.rst

@@ -58,6 +58,9 @@ and are prefixed with ``on_*``.
 * **on_client_exited**    : Linked to browser "beforeunload" event
 * **on_server_exited**    : Trame is exiting its event loop
 
+* **on_error**            : JS error forwarded (msg:str) on the python
+* **on_exception**        : Server exception occurred when interacting with the UI. The exception instance is provided as arg.
+
 * **on_server_reload**    : If callback registered it can be use to hot_reload methods like the UI.
 
 

trame_server/protocol.py

@@ -94,6 +94,13 @@ def port_callback(self, port_used):
             self.server._running_stage = 2
             self.server.state.ready()
             self.server.context.ready()
+
+            # Add on_server_exception
+            self.server.protocol.log_emitter.add_event_listener(
+                "exception", self.server.controller.on_exception.enable_empty()
+            )
+
+            # Trigger on_server_ready
             if self.server.controller.on_server_ready.exists():
                 self.server.controller.on_server_ready(**self.server.state.to_dict())