Add message_handler

src/py/flwr/server/superlink/fleet/message_handler/message_handler.py

@@ -19,7 +19,9 @@
 from typing import List, Optional
 from uuid import UUID
 
-from flwr.common.serde import user_config_to_proto
+from flwr.common.serde import fab_to_proto, user_config_to_proto
+from flwr.common.typing import Fab
+from flwr.proto.fab_pb2 import GetFabRequest, GetFabResponse  # pylint: disable=E0611
 from flwr.proto.fleet_pb2 import (  # pylint: disable=E0611
     CreateNodeRequest,
     CreateNodeResponse,
@@ -40,6 +42,7 @@
     Run,
 )
 from flwr.proto.task_pb2 import TaskIns, TaskRes  # pylint: disable=E0611
+from flwr.server.superlink.ffs.ffs import Ffs
 from flwr.server.superlink.state import State
 
 
@@ -124,5 +127,14 @@ def get_run(
             fab_id=run.fab_id,
             fab_version=run.fab_version,
             override_config=user_config_to_proto(run.override_config),
+            fab_hash=run.fab_hash,
         )
     )
+
+
+def get_fab(
+    request: GetFabRequest, ffs: Ffs  # pylint: disable=W0613
+) -> GetFabResponse:
+    """Get FAB."""
+    fab = Fab(request.hash_str, ffs.get(request.hash_str)[0])
+    return GetFabResponse(fab=fab_to_proto(fab))