raise error when trying to save an etrecord missing essential info

Pull Request resolved: #13143

as title
ghstack-source-id: 301624419
@exported-using-ghexport

Differential Revision: [D79687142](https://our.internmc.facebook.com/intern/diff/D79687142/)

Author: Gasoonjia

devtools/etrecord/_etrecord.py

@@ -70,6 +70,22 @@ def __init__(
         _reference_outputs: Optional[Dict[str, List[ProgramOutput]]] = None,
         _representative_inputs: Optional[List[ProgramInput]] = None,
     ):
+        """
+        Please do not construct an ETRecord object directly.
+
+        If you want to create an ETRecord for logging AOT information to further analysis, please mark `generate_etrecord`
+        as True in your export api, and get the ETRecord object from the `ExecutorchProgramManager`.
+        For exmaple:
+        ```python
+            exported_program = torch.export.export(model, inputs)
+            edge_program = to_edge_transform_and_lower(exported_program, generate_etrecord=True)
+            executorch_program = edge_program.to_executorch()
+            etrecord = executorch_program.get_etrecord()
+        ```
+
+        If user need to create an ETRecord manually, please use the `create_etrecord` function.
+        """
+
         self.exported_program = exported_program
         self.export_graph_id = export_graph_id
         self.edge_dialect_program = edge_dialect_program
@@ -81,15 +97,25 @@ def __init__(
 
     def save(self, path: Union[str, os.PathLike, BinaryIO, IO[bytes]]) -> None:
         """
-        Serialize and save the ETRecord to the specified path.
+        Serialize and save the ETRecord to the specified path for use in Inspector. The ETRecord
+        should contains at least edge dialect program and executorch program information for further
+        analysis, otherwise it will raise an exception.
 
         Args:
             path: Path where the ETRecord file will be saved to.
+
+        Raises:
+            RuntimeError: If the ETRecord does not contain essential information for Inpector.
         """
         if isinstance(path, (str, os.PathLike)):
             # pyre-ignore[6]: In call `os.fspath`, for 1st positional argument, expected `str` but got `Union[PathLike[typing.Any], str]`
             path = os.fspath(path)
 
+        if not (self.edge_dialect_program and self._debug_handle_map):
+            raise RuntimeError(
+                "ETRecord must contain edge dialect program and executorch program to be saved"
+            )
+
         etrecord_zip = ZipFile(path, "w")
 
         try:

devtools/etrecord/tests/etrecord_test.py

@@ -1462,3 +1462,32 @@ def test_update_apis_and_save_parse(self):
                 custom_outputs["forward"], parsed_etrecord._reference_outputs["forward"]
             ):
                 self.assertTrue(torch.equal(expected[0], actual[0]))
+
+    def test_save_missing_essential_info(self):
+        def expected_runtime_error(etrecord, etrecord_path):
+            with self.assertRaises(RuntimeError) as context:
+                etrecord.save(etrecord_path)
+
+            self.assertIn(
+                "ETRecord must contain edge dialect program and executorch program to be saved",
+                str(context.exception),
+            )
+
+        """Test that save raises RuntimeError when essential info is missing."""
+        _, edge_output, et_output = self.get_test_model()
+
+        etrecord = ETRecord()
+
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            etrecord_path = tmpdirname + "/etrecord_no_edge.bin"
+
+            expected_runtime_error(etrecord, etrecord_path)
+            etrecord.add_edge_dialect_program(edge_output)
+
+            # Should raise runtime error due to  missing executorch program related info
+            expected_runtime_error(etrecord, etrecord_path)
+
+            etrecord.add_executorch_program(et_output)
+
+            # All essential components are now present, so save should succeed
+            etrecord.save(etrecord_path)