Merge branch '344676-investigate-diff-issues-in-production' into 'master'

Adds logging messages for IpynbDiff

See merge request gitlab-org/gitlab!73576

app/presenters/blob_presenter.rb

@@ -121,6 +121,19 @@ def language
   end
 
   def transformed_blob_data
-    @transformed_blob ||= ( blob.path.ends_with?('.ipynb') && IpynbDiff.transform(blob.data, options: { include_metadata: false, cell_decorator: :percent }) ) || blob.data
+    @transformed_blob ||= if blob.path.ends_with?('.ipynb')
+                            new_blob = IpynbDiff.transform(blob.data,
+                                                           raise_errors: true,
+                                                           options: { include_metadata: false, cell_decorator: :percent })
+
+                            Gitlab::AppLogger.info(new_blob ? 'IPYNBDIFF_BLOB_GENERATED' : 'IPYNBDIFF_BLOB_NIL')
+
+                            new_blob
+                          end
+
+    @transformed_blob ||= blob.data
+  rescue IpynbDiff::InvalidNotebookError => e
+    Gitlab::ErrorTracking.track_exception(e, issue_url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/344676')
+    blob.data
   end
 end

lib/gitlab/diff/file.rb

@@ -458,9 +458,17 @@ def preprocess_before_diff(diff)
 
         new_diff = IpynbDiff.diff(from, to,
                                   diff_opts: { context: 5, include_diff_info: true },
-                                  transform_options: { cell_decorator: :percent } )
+                                  transform_options: { cell_decorator: :percent },
+                                  raise_if_invalid_notebook: true)
 
         diff.diff = new_diff.scan(/.*\n/)[2..-1].join('') if new_diff
+
+        Gitlab::AppLogger.info({ message: new_diff ? 'IPYNB_DIFF_GENERATED' : 'IPYNB_DIFF_NIL',
+                                 from: from&.to_s, to: to&.to_s,
+                                 lib_version: Gem.loaded_specs["ipynbdiff"].version.version })
+
+      rescue IpynbDiff::InvalidNotebookError => e
+        Gitlab::ErrorTracking.track_exception(e, issue_url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/344676')
       end
 
       def alternate_viewer_class