Initial commit

lib/carto/visualization_invalidation_service.rb

@@ -0,0 +1,63 @@
+module Carto
+  class VisualizationInvalidationService
+    def initialize(visualization)
+      @visualization = visualization
+    end
+
+    def invalidate
+      invalidate_caches
+      invalidate_affected_visualizations if attributes_affecting_visualizations_changed?
+      update_or_destroy_named_map
+    end
+
+    protected
+
+    def invalidate_caches
+      invalidate_embeds_from_redis
+      invalidate_vizjson_from_redis
+      invalidate_vizjson_from_varnish
+    end
+
+    private
+
+    def update_or_destroy_named_map
+      return if @visualization.remote?
+      named_maps_api = Carto::NamedMaps::Api.new(@visualization.for_presentation)
+      if @visualization.destroyed?
+        named_maps_api.destroy
+      elsif @visualization.data_layers.any?
+        named_maps_api.upsert
+      end
+    end
+
+    def invalidate_affected_visualizations
+      return unless @visualization.user_table
+      # Invalidate the maps where this table is used. This is needed because the attributions of the datasets used
+      # in a map is used in the vizjson, and the description is shown in the public pages/embed.
+      # There is no need to invalidate the named maps, as nothing from the dataset is included there.
+      @visualization.user_table.dependent_visualizations.each do |affected_visualization|
+        VisualizationInvalidationService.new(affected_visualization).invalidate_caches
+      end
+    end
+
+    def invalidate_embeds_from_redis
+      EmbedRedisCache.new($tables_metadata).invalidate(@visualization.id)
+    end
+
+    def invalidate_vizjson_from_redis
+      CartoDB::Visualization::RedisVizjsonCache.new.invalidate(@visualization.id)
+    end
+
+    def invalidate_vizjson_from_varnish
+      CartoDB::Varnish.new.purge(".*#{@visualization.id}:vizjson")
+    end
+
+    def attributes_affecting_visualizations_changed?
+      @visualization.canonical? &&
+        (
+          @visualization.previous_changes.include?(:description) ||
+          @visualization.previous_changes.include?(:attributions)
+        )
+    end
+  end
+end