1 files changed, 47 insertions, 0 deletions
diff --git a/app/controllers/concerns/redis_tracking.rb b/app/controllers/concerns/redis_tracking.rb
new file mode 100644
index 00000000000..fa5eef981d1
--- /dev/null
+++ b/app/controllers/concerns/redis_tracking.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+# Example:
+#
+# # In controller include module
+# # Track event for index action
+#
+# include RedisTracking
+#
+# track_redis_hll_event :index, :show, name: 'i_analytics_dev_ops_score', feature: :my_feature
+#
+# if the feature flag is enabled by default you should use
+# track_redis_hll_event :index, :show, name: 'i_analytics_dev_ops_score', feature: :my_feature, feature_default_enabled: true
+module RedisTracking
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def track_redis_hll_event(*controller_actions, name:, feature:, feature_default_enabled: false)
+      after_action only: controller_actions, if: -> { request.format.html? && request.headers['DNT'] != '1' } do
+        track_unique_redis_hll_event(name, feature, feature_default_enabled)
+      end
+    end
+  end
+
+  private
+
+  def track_unique_redis_hll_event(event_name, feature, feature_default_enabled)
+    return unless metric_feature_enabled?(feature, feature_default_enabled)
+    return unless Gitlab::CurrentSettings.usage_ping_enabled?
+    return unless visitor_id
+
+    Gitlab::UsageDataCounters::HLLRedisCounter.track_event(visitor_id, event_name)
+  end
+
+  def metric_feature_enabled?(feature, default_enabled)
+    Feature.enabled?(feature, default_enabled: default_enabled)
+  end
+
+  def visitor_id
+    return cookies[:visitor_id] if cookies[:visitor_id].present?
+    return unless current_user
+
+    uuid = SecureRandom.uuid
+    cookies[:visitor_id] = { value: uuid, expires: 24.months }
+    uuid
+  end
+end