Introduce "polling_interval_multiplier" as application setting

Implement module for setting "Poll-Interval" response header.
Return 429 in ETag caching middleware when polling is disabled.

1 files changed, 34 insertions, 0 deletions

diff --git a/spec/lib/gitlab/polling_interval_spec.rb b/spec/lib/gitlab/polling_interval_spec.rb
new file mode 100644
index 00000000000..56c2847e26a
--- /dev/null
+++ b/spec/lib/gitlab/polling_interval_spec.rb
@@ -0,0 +1,34 @@
+require 'spec_helper'
+
+describe Gitlab::PollingInterval, lib: true do
+  let(:polling_interval) { described_class }
+
+  describe '.set_header' do
+    let(:headers) { {} }
+    let(:response) { double(headers: headers) }
+
+    context 'when polling is disabled' do
+      before do
+        stub_application_setting(polling_interval_multiplier: 0)
+      end
+
+      it 'sets value to -1' do
+        polling_interval.set_header(response, interval: 10_000)
+
+        expect(headers['Poll-Interval']).to eq(-1)
+      end
+    end
+
+    context 'when polling is enabled' do
+      before do
+        stub_application_setting(polling_interval_multiplier: 0.33333)
+      end
+
+      it 'applies modifier to base interval' do
+        polling_interval.set_header(response, interval: 10_000)
+
+        expect(headers['Poll-Interval']).to eq(3333)
+      end
+    end
+  end
+end