1 files changed, 40 insertions, 0 deletions
diff --git a/lib/gitlab/metrics/dashboard/service.rb b/lib/gitlab/metrics/dashboard/service.rb
new file mode 100644
index 00000000000..79d563cce4f
--- /dev/null
+++ b/lib/gitlab/metrics/dashboard/service.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# Fetches the metrics dashboard layout and supplemented the output with DB info.
+module Gitlab
+  module Metrics
+    module Dashboard
+      class Service < ::BaseService
+        SYSTEM_DASHBOARD_NAME = 'common_metrics'
+        SYSTEM_DASHBOARD_PATH = Rails.root.join('config', 'prometheus', "#{SYSTEM_DASHBOARD_NAME}.yml")
+
+        # Returns a DB-supplemented json representation of a dashboard config file.
+        def get_dashboard
+          dashboard_string = Rails.cache.fetch(cache_key) { system_dashboard }
+
+          dashboard = process_dashboard(dashboard_string)
+
+          success(dashboard: dashboard)
+        rescue Gitlab::Metrics::Dashboard::Stages::BaseStage::DashboardLayoutError => e
+          error(e.message, :unprocessable_entity)
+        end
+
+        private
+
+        # Returns the base metrics shipped with every GitLab service.
+        def system_dashboard
+          YAML.safe_load(File.read(SYSTEM_DASHBOARD_PATH))
+        end
+
+        def cache_key
+          "metrics_dashboard_#{SYSTEM_DASHBOARD_NAME}"
+        end
+
+        # Returns a new dashboard Hash, supplemented with DB info
+        def process_dashboard(dashboard)
+          Gitlab::Metrics::Dashboard::Processor.new(project, params[:environment], dashboard).process
+        end
+      end
+    end
+  end
+end