1 files changed, 54 insertions, 0 deletions
diff --git a/app/services/metrics/dashboard/panel_preview_service.rb b/app/services/metrics/dashboard/panel_preview_service.rb
new file mode 100644
index 00000000000..5b24d817fb6
--- /dev/null
+++ b/app/services/metrics/dashboard/panel_preview_service.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+# Ingest YAML fragment with metrics dashboard panel definition
+# https://docs.gitlab.com/ee/operations/metrics/dashboards/yaml.html#panel-panels-properties
+# process it and returns renderable json version
+module Metrics
+  module Dashboard
+    class PanelPreviewService
+      SEQUENCE = [
+        ::Gitlab::Metrics::Dashboard::Stages::CommonMetricsInserter,
+        ::Gitlab::Metrics::Dashboard::Stages::MetricEndpointInserter,
+        ::Gitlab::Metrics::Dashboard::Stages::PanelIdsInserter,
+        ::Gitlab::Metrics::Dashboard::Stages::AlertsInserter,
+        ::Gitlab::Metrics::Dashboard::Stages::UrlValidator
+      ].freeze
+
+      HANDLED_PROCESSING_ERRORS = [
+        Gitlab::Metrics::Dashboard::Errors::DashboardProcessingError,
+        Gitlab::Config::Loader::Yaml::NotHashError,
+        Gitlab::Config::Loader::Yaml::DataTooLargeError,
+        Gitlab::Config::Loader::FormatError
+      ].freeze
+
+      def initialize(project, panel_yaml, environment)
+        @project, @panel_yaml, @environment = project, panel_yaml, environment
+      end
+
+      def execute
+        dashboard = ::Gitlab::Metrics::Dashboard::Processor.new(project, dashboard_structure, SEQUENCE, environment: environment).process
+        ServiceResponse.success(payload: dashboard[:panel_groups][0][:panels][0])
+      rescue *HANDLED_PROCESSING_ERRORS => error
+        ServiceResponse.error(message: error.message)
+      end
+
+      private
+
+      attr_accessor :project, :panel_yaml, :environment
+
+      def dashboard_structure
+        {
+          panel_groups: [
+            {
+              panels: [panel_hash]
+            }
+          ]
+        }
+      end
+
+      def panel_hash
+        ::Gitlab::Config::Loader::Yaml.new(panel_yaml).load_raw!
+      end
+    end
+  end
+end