Raise warings for message.UnknownFields() usages and navigate to the new add

one API

The message.UnknownFields() support will be removed soon

PiperOrigin-RevId: 553871453

python/google/protobuf/internal/python_message.py

@@ -53,8 +53,12 @@ __author__ = 'robinson@google.com (Will Robinson)'
 from io import BytesIO
 import struct
 import sys
+import warnings
 import weakref
 
+from google.protobuf import descriptor as descriptor_mod
+from google.protobuf import message as message_mod
+from google.protobuf import text_format
 # We use "as" to avoid name collisions with variables.
 from google.protobuf.internal import api_implementation
 from google.protobuf.internal import containers
@@ -66,9 +70,6 @@ from google.protobuf.internal import message_listener as message_listener_mod
 from google.protobuf.internal import type_checkers
 from google.protobuf.internal import well_known_types
 from google.protobuf.internal import wire_format
-from google.protobuf import descriptor as descriptor_mod
-from google.protobuf import message as message_mod
-from google.protobuf import text_format
 
 _FieldDescriptor = descriptor_mod.FieldDescriptor
 _AnyFullTypeName = 'google.protobuf.Any'
@@ -1361,6 +1362,11 @@ def _Clear(self):
 
 
 def _UnknownFields(self):
+  warnings.warn(
+      'message.UnknownFields() is deprecated. Please use the add one '
+      'feature message_factotry.UnknownFieldSet(message) in '
+      'message_factotry.py instead.'
+  )
   if self._unknown_field_set is None:  # pylint: disable=protected-access
     # pylint: disable=protected-access
     self._unknown_field_set = containers.UnknownFieldSet()

python/google/protobuf/pyext/message.cc

@@ -2368,6 +2368,10 @@ static PyObject* GetExtensionDict(CMessage* self, void *closure) {
 }
 
 static PyObject* GetUnknownFields(CMessage* self) {
+  PyErr_Warn(nullptr,
+             "message.UnknownFields() is deprecated. Please use the "
+             "add one feature message_factotry.UnknownFieldSet(message) in "
+             "message_factotry.py instead.");
   if (self->unknown_field_set == nullptr) {
     self->unknown_field_set = unknown_fields::NewPyUnknownFields(self);
   } else {