Publishing: Resolve exceptions on publish branch (#20464)

* Reduce log level of image cropper converter to avoid flooding logs with expected exceptions.

* Don't run publish branch long running operation on a background thread such that UmbracoContext is available.

* Revert to background thread and use EnsureUmbracoContext to ensure we can get an IUmbracoContext in the URL providers.

* Updated tests.

* Applied suggestion from code review.

* Clarified comment.

src/Umbraco.Core/Services/ContentPublishingService.cs

@@ -8,6 +8,7 @@ using Umbraco.Cms.Core.Models.ContentEditing;
 using Umbraco.Cms.Core.Models.ContentPublishing;
 using Umbraco.Cms.Core.Scoping;
 using Umbraco.Cms.Core.Services.OperationStatus;
+using Umbraco.Cms.Core.Web;
 using Umbraco.Extensions;
 
 namespace Umbraco.Cms.Core.Services;
@@ -26,6 +27,7 @@ internal sealed class ContentPublishingService : IContentPublishingService
     private readonly IRelationService _relationService;
     private readonly ILogger<ContentPublishingService> _logger;
     private readonly ILongRunningOperationService _longRunningOperationService;
+    private readonly IUmbracoContextFactory _umbracoContextFactory;
 
     public ContentPublishingService(
         ICoreScopeProvider coreScopeProvider,
@@ -37,7 +39,8 @@ internal sealed class ContentPublishingService : IContentPublishingService
         IOptionsMonitor<ContentSettings> optionsMonitor,
         IRelationService relationService,
         ILogger<ContentPublishingService> logger,
-        ILongRunningOperationService longRunningOperationService)
+        ILongRunningOperationService longRunningOperationService,
+        IUmbracoContextFactory umbracoContextFactory)
     {
         _coreScopeProvider = coreScopeProvider;
         _contentService = contentService;
@@ -53,6 +56,7 @@ internal sealed class ContentPublishingService : IContentPublishingService
         {
             _contentSettings = contentSettings;
         });
+        _umbracoContextFactory = umbracoContextFactory;
     }
 
     /// <inheritdoc />
@@ -290,7 +294,7 @@ internal sealed class ContentPublishingService : IContentPublishingService
             return MapInternalPublishingAttempt(minimalAttempt);
         }
 
-        _logger.LogInformation("Starting async background thread for publishing branch.");
+        _logger.LogDebug("Starting long running operation for publishing branch {Key} on background thread.", key);
         Attempt<Guid, LongRunningOperationEnqueueStatus> enqueueAttempt = await _longRunningOperationService.RunAsync(
             PublishBranchOperationType,
             async _ => await PerformPublishBranchAsync(key, cultures, publishBranchFilter, userKey, returnContent: false),
@@ -324,6 +328,10 @@ internal sealed class ContentPublishingService : IContentPublishingService
         Guid userKey,
         bool returnContent)
     {
+        // Ensure we have an UmbracoContext in case running on a background thread so operations that run in the published notification handlers
+        // have access to this (e.g. webhooks).
+        using UmbracoContextReference umbracoContextReference = _umbracoContextFactory.EnsureUmbracoContext();
+
         using ICoreScope scope = _coreScopeProvider.CreateCoreScope();
         IContent? content = _contentService.GetById(key);
         if (content is null)

src/Umbraco.Infrastructure/PropertyEditors/ValueConverters/ImageCropperValueConverter.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Umbraco.
 // See LICENSE for more details.
 
+using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using Umbraco.Cms.Core.Models.DeliveryApi;
 using Umbraco.Cms.Core.Models.PublishedContent;
@@ -53,10 +54,10 @@ public class ImageCropperValueConverter : PropertyValueConverterBase, IDeliveryA
         {
             value = _jsonSerializer.Deserialize<ImageCropperValue>(sourceString);
         }
-        catch (Exception ex)
+        catch (JsonException ex)
         {
-            // cannot deserialize, assume it may be a raw image URL
-            _logger.LogError(ex, "Could not deserialize string '{JsonString}' into an image cropper value.", sourceString);
+            // Cannot deserialize, assume it may be a raw image URL.
+            _logger.LogDebug(ex, "Could not deserialize string '{JsonString}' into an image cropper value.", sourceString);
             value = new ImageCropperValue { Src = sourceString };
         }