feat: Add Dataset Site caching

Author: nickevansuk

OpenActive.Server.NET/CustomBookingEngine/CustomBookingEngine.cs

@@ -154,7 +154,7 @@ public async Task<ResponseContent> RenderDatasetSite()
         {
             if (datasetSettings == null || supportedFeeds == null) throw new NotSupportedException("RenderDatasetSite is only supported if DatasetSiteGeneratorSettings are supplied to the IBookingEngine");
             // TODO add caching layer in front of dataset site rendering
-            return ResponseContent.HtmlResponse(DatasetSiteGenerator.RenderSimpleDatasetSite(datasetSettings, supportedFeeds));
+            return ResponseContent.HtmlResponse(DatasetSiteGenerator.RenderSimpleDatasetSite(datasetSettings, supportedFeeds), this.settings.DatasetSiteCacheDuration);
         }
 
         /// <summary>

OpenActive.Server.NET/OpenBookingHelper/Content/ResponseContent.cs

@@ -11,13 +11,14 @@ namespace OpenActive.Server.NET.OpenBookingHelper
     /// </summary>
     public class ResponseContent
     {
-        public static ResponseContent HtmlResponse(string content)
+        public static ResponseContent HtmlResponse(string content, TimeSpan cacheControlMaxAge)
         {
             return new ResponseContent
             {
                 Content = content,
                 ContentType = System.Net.Mime.MediaTypeNames.Text.Html,
-                StatusCode = HttpStatusCode.OK
+                StatusCode = HttpStatusCode.OK,
+                CacheControlMaxAge = cacheControlMaxAge
             };
         }
 

OpenActive.Server.NET/OpenBookingHelper/Settings/BookingEngineSettings.cs

@@ -37,5 +37,10 @@ public class BookingEngineSettings
         /// See https://developer.openactive.io/publishing-data/data-feeds/scaling-feeds for CDN configuration instructions
         /// </summary>
         public TimeSpan RPDELastPageCacheDuration { get; set; } = TimeSpan.FromSeconds(8);
+        /// <summary>
+        /// TTL in the Cache-Control header for the dataset site
+        /// See https://developer.openactive.io/publishing-data/data-feeds/scaling-feeds for CDN configuration instructions
+        /// </summary>
+        public TimeSpan DatasetSiteCacheDuration { get; set; } = TimeSpan.FromMinutes(15);
     }
 }