Serve 503 when PocketBase is unavailable across all content pages

Elternbeirat.Web/Features/Embeds/FaqsEmbed.razor.cs

@@ -6,14 +6,24 @@ namespace Elternbeirat.Web.Features.Embeds;
 
 public partial class FaqsEmbed
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load FAQs for an embed from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    // Number of questions shown in the teaser; the full hub is one link away.
+    private const int TeaserCount = 3;
+
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load FAQs for an embed from PocketBase; the teaser is omitted.")]
+    private static partial void LogSourceUnavailable(
+        ILogger logger,
+        Exception exception);
 
     [Inject]
-    private PocketBaseClient PocketBase { get; set; } = default!;
+    private PocketBaseClient PocketBase { get; set; } = null!;
 
     [Inject]
-    private ILogger<FaqsEmbed> Logger { get; set; } = default!;
+    private ILogger<FaqsEmbed> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<Faq> _faqs = [];
 
@@ -21,14 +31,16 @@ public partial class FaqsEmbed
     {
         try
         {
-            // Teaser: the first three questions, with a link to the full hub.
-            var faqs = await PocketBase.GetFaqsAsync();
-            _faqs = [.. faqs.Take(3)];
+            // GetFaqsAsync is ordered by topic, then question, so the first entries
+            // the teaser takes are stable across requests.
+            var faqs = await PocketBase.GetFaqsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
+            _faqs = [.. faqs.Take(TeaserCount)];
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException exception)
         {
-            // Source unreachable -> show no teaser instead of a 500.
-            LogLoadFailed(Logger, ex);
+            // Only part of the page fails: omit the teaser, keep the page (and its
+            // 200) intact. A missing teaser is degraded, not broken.
+            LogSourceUnavailable(Logger, exception);
         }
     }
 }