1 files changed, 63 insertions, 0 deletions
diff --git a/app/controllers/concerns/metrics_dashboard.rb b/app/controllers/concerns/metrics_dashboard.rb
new file mode 100644
index 00000000000..62efdacb710
--- /dev/null
+++ b/app/controllers/concerns/metrics_dashboard.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+# Provides an action which fetches a metrics dashboard according
+# to the parameters specified by the controller.
+module MetricsDashboard
+  extend ActiveSupport::Concern
+
+  def metrics_dashboard
+    result = dashboard_finder.find(
+      project_for_dashboard,
+      current_user,
+      metrics_dashboard_params
+    )
+
+    if include_all_dashboards?
+      result[:all_dashboards] = dashboard_finder.find_all_paths(project_for_dashboard)
+    end
+
+    respond_to do |format|
+      if result[:status] == :success
+        format.json { render dashboard_success_response(result) }
+      else
+        format.json { render dashboard_error_response(result) }
+      end
+    end
+  end
+
+  private
+
+  # Override in class to provide arguments to the finder.
+  def metrics_dashboard_params
+    {}
+  end
+
+  # Override in class if response requires complete list of
+  # dashboards in addition to requested dashboard body.
+  def include_all_dashboards?
+    false
+  end
+
+  def dashboard_finder
+    ::Gitlab::Metrics::Dashboard::Finder
+  end
+
+  # Project is not defined for group and admin level clusters.
+  def project_for_dashboard
+    defined?(project) ? project : nil
+  end
+
+  def dashboard_success_response(result)
+    {
+      status: :ok,
+      json: result.slice(:all_dashboards, :dashboard, :status)
+    }
+  end
+
+  def dashboard_error_response(result)
+    {
+      status: result[:http_status],
+      json: result.slice(:all_dashboards, :message, :status)
+    }
+  end
+end