Serve 503 when PocketBase is unavailable across all content pages

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

@@ -1,4 +1,3 @@
-using System.Globalization;
 using Elternbeirat.Contracts;
 using Elternbeirat.PocketBase;
 using Microsoft.AspNetCore.Components;
@@ -7,16 +6,24 @@ namespace Elternbeirat.Web.Features.Embeds;
 
 public partial class PostsEmbed
 {
-    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
+    // Number of posts shown in the teaser; the full list is one link away.
+    private const int TeaserCount = 3;
 
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load posts for an embed from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load posts 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<PostsEmbed> Logger { get; set; } = default!;
+    private ILogger<PostsEmbed> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<Post> _latest = [];
 
@@ -24,14 +31,15 @@ public partial class PostsEmbed
     {
         try
         {
-            // Teaser: the three most recent posts, with a link to the full list.
-            var posts = await PocketBase.GetPostsAsync();
-            _latest = [.. posts.Take(3)];
+            // GetPostsAsync returns newest first, so the first entries are the latest.
+            var posts = await PocketBase.GetPostsAsync(HttpContext?.RequestAborted ?? CancellationToken.None);
+            _latest = [.. posts.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);
         }
     }
 }