Serve 503 when PocketBase is unavailable across all content pages

Elternbeirat.Web/Components/Layout/MainLayout.razor.cs

@@ -6,14 +6,19 @@ namespace Elternbeirat.Web.Components.Layout;
 
 public partial class MainLayout
 {
-    [LoggerMessage(Level = LogLevel.Warning, Message = "Could not load navigation pages from PocketBase.")]
-    private static partial void LogLoadFailed(ILogger logger, Exception exception);
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Could not load navigation pages from PocketBase; the menu is empty.")]
+    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<MainLayout> Logger { get; set; } = default!;
+    private ILogger<MainLayout> Logger { get; set; } = null!;
+
+    [CascadingParameter]
+    private HttpContext? HttpContext { get; set; }
 
     private IReadOnlyList<NavLinkItem> _header = [];
     private IReadOnlyList<NavLinkItem> _footer = [];
@@ -22,15 +27,15 @@ public partial class MainLayout
     {
         try
         {
-            var pages = await PocketBase.GetPagesAsync();
+            var pages = await PocketBase.GetPagesAsync(HttpContext?.RequestAborted ?? default);
             _header = NavBuilder.Header(pages);
             _footer = NavBuilder.Footer(pages);
         }
-        catch (HttpRequestException ex)
+        catch (PocketBaseUnavailableException ex)
         {
-            // Source unreachable -> render the chrome with an empty menu instead of
-            // a 500. The brand link still leads home.
-            LogLoadFailed(Logger, ex);
+            // Only the menu fails: render the chrome with an empty menu instead of a
+            // 500, so every page stays reachable. The brand link still leads home.
+            LogSourceUnavailable(Logger, ex);
         }
     }
 }