Add top-level warnings key to performance bar response

This key is useful to reduce the amount of logic needed on the frontend:
if `has_warnings` is true, then the frontend knows that the request in
question has warnings for some metric.

1 files changed, 29 insertions, 0 deletions

diff --git a/spec/lib/gitlab/performance_bar/with_top_level_warnings_spec.rb b/spec/lib/gitlab/performance_bar/with_top_level_warnings_spec.rb
new file mode 100644
index 00000000000..3b92261f0fe
--- /dev/null
+++ b/spec/lib/gitlab/performance_bar/with_top_level_warnings_spec.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+require 'rspec-parameterized'
+
+describe Gitlab::PerformanceBar::WithTopLevelWarnings do
+  using RSpec::Parameterized::TableSyntax
+
+  subject { Module.new }
+
+  before do
+    subject.singleton_class.prepend(described_class)
+  end
+
+  describe '#has_warnings?' do
+    where(:has_warnings, :results) do
+      false | { data: {} }
+      false | { data: { gitaly: { warnings: [] } } }
+      true  | { data: { gitaly: { warnings: [1] } } }
+      true  | { data: { gitaly: { warnings: [] }, redis: { warnings: [1] } } }
+    end
+
+    with_them do
+      it do
+        expect(subject.has_warnings?(results)).to eq(has_warnings)
+      end
+    end
+  end
+end