1 files changed, 30 insertions, 0 deletions
diff --git a/app/services/ci/generate_codequality_mr_diff_report_service.rb b/app/services/ci/generate_codequality_mr_diff_report_service.rb
new file mode 100644
index 00000000000..3b1bd319a4f
--- /dev/null
+++ b/app/services/ci/generate_codequality_mr_diff_report_service.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module Ci
+  # TODO: a couple of points with this approach:
+  # + reuses existing architecture and reactive caching
+  # - it's not a report comparison and some comparing features must be turned off.
+  # see CompareReportsBaseService for more notes.
+  # issue: https://gitlab.com/gitlab-org/gitlab/issues/34224
+  class GenerateCodequalityMrDiffReportService < CompareReportsBaseService
+    def execute(base_pipeline, head_pipeline)
+      merge_request = MergeRequest.find_by_id(params[:id])
+      {
+        status: :parsed,
+        key: key(base_pipeline, head_pipeline),
+        data: head_pipeline.pipeline_artifacts.find_by_file_type(:code_quality_mr_diff).present.for_files(merge_request.new_paths)
+      }
+    rescue => e
+      Gitlab::ErrorTracking.track_exception(e, project_id: project.id)
+      {
+        status: :error,
+        key: key(base_pipeline, head_pipeline),
+        status_reason: _('An error occurred while fetching codequality mr diff reports.')
+      }
+    end
+
+    def latest?(base_pipeline, head_pipeline, data)
+      data&.fetch(:key, nil) == key(base_pipeline, head_pipeline)
+    end
+  end
+end