Add conversion functions for Message (#2843)

src/py/flwr/common/serde.py

@@ -17,7 +17,7 @@
 
 from typing import Any, Dict, List, MutableMapping, OrderedDict, Type, TypeVar, cast
 
-from google.protobuf.message import Message
+from google.protobuf.message import Message as GrpcMessage
 
 # pylint: disable=E0611
 from flwr.proto.recordset_pb2 import Array as ProtoArray
@@ -30,7 +30,7 @@
 from flwr.proto.recordset_pb2 import ParametersRecord as ProtoParametersRecord
 from flwr.proto.recordset_pb2 import RecordSet as ProtoRecordSet
 from flwr.proto.recordset_pb2 import Sint64List, StringList
-from flwr.proto.task_pb2 import Value
+from flwr.proto.task_pb2 import Task, TaskIns, TaskRes, Value
 from flwr.proto.transport_pb2 import (
     ClientMessage,
     Code,
@@ -44,6 +44,7 @@
 # pylint: enable=E0611
 from . import typing
 from .configsrecord import ConfigsRecord
+from .message import Message, Metadata
 from .metricsrecord import MetricsRecord
 from .parametersrecord import Array, ParametersRecord
 from .recordset import RecordSet
@@ -620,7 +621,7 @@ def _record_value_to_proto(
     )
 
 
-def _record_value_from_proto(value_proto: Message) -> Any:
+def _record_value_from_proto(value_proto: GrpcMessage) -> Any:
     """Deserialize `*RecordValue` from ProtoBuf."""
     value_field = cast(str, value_proto.WhichOneof("value"))
     if value_field.endswith("list"):
@@ -751,3 +752,64 @@ def recordset_from_proto(recordset_proto: ProtoRecordSet) -> RecordSet:
             k: configs_record_from_proto(v) for k, v in recordset_proto.configs.items()
         },
     )
+
+
+# === Message ===
+
+
+def message_to_taskins(message: Message) -> TaskIns:
+    """Create a TaskIns from the Message."""
+    return TaskIns(
+        task=Task(
+            ttl=message.metadata.ttl,
+            task_type=message.metadata.task_type,
+            recordset=recordset_to_proto(message.message),
+        ),
+    )
+
+
+def message_from_taskins(taskins: TaskIns) -> Message:
+    """Create a Message from the TaskIns."""
+    # Retrieve the Metadata
+    metadata = Metadata(
+        run_id=taskins.run_id,
+        task_id=taskins.task_id,
+        group_id=taskins.group_id,
+        ttl=taskins.task.ttl,
+        task_type=taskins.task.task_type,
+    )
+
+    # Return the Message
+    return Message(
+        metadata=metadata,
+        message=recordset_from_proto(taskins.task.recordset),
+    )
+
+
+def message_to_taskres(message: Message) -> TaskRes:
+    """Create a TaskRes from the Message."""
+    return TaskRes(
+        task=Task(
+            ttl=message.metadata.ttl,
+            task_type=message.metadata.task_type,
+            recordset=recordset_to_proto(message.message),
+        ),
+    )
+
+
+def message_from_taskres(taskres: TaskRes) -> Message:
+    """Create a Message from the TaskIns."""
+    # Retrieve the MetaData
+    metadata = Metadata(
+        run_id=taskres.run_id,
+        task_id=taskres.task_id,
+        group_id=taskres.group_id,
+        ttl=taskres.task.ttl,
+        task_type=taskres.task.task_type,
+    )
+
+    # Return the Message
+    return Message(
+        metadata=metadata,
+        message=recordset_from_proto(taskres.task.recordset),
+    )