1 files changed, 53 insertions, 0 deletions
diff --git a/lib/gitlab/ci/reports/coverage_report_generator.rb b/lib/gitlab/ci/reports/coverage_report_generator.rb
new file mode 100644
index 00000000000..fd73ed6fd25
--- /dev/null
+++ b/lib/gitlab/ci/reports/coverage_report_generator.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module Reports
+      class CoverageReportGenerator
+        include Gitlab::Utils::StrongMemoize
+
+        def initialize(pipeline)
+          @pipeline = pipeline
+        end
+
+        def report
+          coverage_report = Gitlab::Ci::Reports::CoverageReport.new
+
+          # Return an empty report if the pipeline is a child pipeline.
+          # Since the coverage report is used in a merge request report,
+          # we are only interested in the coverage report from the root pipeline.
+          return coverage_report if @pipeline.child?
+
+          coverage_report.tap do |coverage_report|
+            report_builds.find_each do |build|
+              build.each_report(::Ci::JobArtifact::COVERAGE_REPORT_FILE_TYPES) do |file_type, blob|
+                Gitlab::Ci::Parsers.fabricate!(file_type).parse!(
+                  blob,
+                  coverage_report,
+                  project_path: @pipeline.project.full_path,
+                  worktree_paths: @pipeline.all_worktree_paths
+                )
+              end
+            end
+          end
+        end
+
+        private
+
+        def report_builds
+          if child_pipeline_feature_enabled?
+            @pipeline.latest_report_builds_in_self_and_descendants(::Ci::JobArtifact.coverage_reports)
+          else
+            @pipeline.latest_report_builds(::Ci::JobArtifact.coverage_reports)
+          end
+        end
+
+        def child_pipeline_feature_enabled?
+          strong_memoize(:feature_enabled) do
+            Feature.enabled?(:ci_child_pipeline_coverage_reports, @pipeline.project)
+          end
+        end
+      end
+    end
+  end
+end