1 files changed, 70 insertions, 0 deletions
diff --git a/lib/gitlab/usage_data_counters/track_unique_events.rb b/lib/gitlab/usage_data_counters/track_unique_events.rb
new file mode 100644
index 00000000000..7053744b665
--- /dev/null
+++ b/lib/gitlab/usage_data_counters/track_unique_events.rb
@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module UsageDataCounters
+    module TrackUniqueEvents
+      WIKI_ACTION = :wiki_action
+      DESIGN_ACTION = :design_action
+      PUSH_ACTION = :project_action
+      MERGE_REQUEST_ACTION = :merge_request_action
+
+      ACTION_TRANSFORMATIONS = HashWithIndifferentAccess.new({
+        wiki: {
+          created: WIKI_ACTION,
+          updated: WIKI_ACTION,
+          destroyed: WIKI_ACTION
+        },
+        design: {
+          created: DESIGN_ACTION,
+          updated: DESIGN_ACTION,
+          destroyed: DESIGN_ACTION
+        },
+        project: {
+          pushed: PUSH_ACTION
+        },
+        merge_request: {
+          closed: MERGE_REQUEST_ACTION,
+          merged: MERGE_REQUEST_ACTION,
+          created: MERGE_REQUEST_ACTION,
+          commented: MERGE_REQUEST_ACTION
+        }
+      }).freeze
+
+      class << self
+        def track_event(event_action:, event_target:, author_id:, time: Time.zone.now)
+          return unless valid_target?(event_target)
+          return unless valid_action?(event_action)
+
+          transformed_target = transform_target(event_target)
+          transformed_action = transform_action(event_action, transformed_target)
+
+          return unless Gitlab::UsageDataCounters::HLLRedisCounter.known_event?(transformed_action.to_s)
+
+          Gitlab::UsageDataCounters::HLLRedisCounter.track_event(author_id, transformed_action.to_s, time)
+        end
+
+        def count_unique_events(event_action:, date_from:, date_to:)
+          Gitlab::UsageDataCounters::HLLRedisCounter.unique_events(event_names: event_action.to_s, start_date: date_from, end_date: date_to)
+        end
+
+        private
+
+        def transform_action(event_action, event_target)
+          ACTION_TRANSFORMATIONS.dig(event_target, event_action) || event_action
+        end
+
+        def transform_target(event_target)
+          Event::TARGET_TYPES.key(event_target)
+        end
+
+        def valid_target?(target)
+          Event::TARGET_TYPES.value?(target)
+        end
+
+        def valid_action?(action)
+          Event.actions.key?(action)
+        end
+      end
+    end
+  end
+end