When the DB fails to save, log out all the series the user should look into for constraint issues and push a message to the admins connected to webui. (#687)

API/Services/Tasks/ScannerService.cs

@@ -301,7 +301,21 @@ namespace API.Services.Tasks
                   UpdateSeries(series, parsedSeries);
               });
 
+              try
+              {
                   await _unitOfWork.CommitAsync();
+              }
+              catch (Exception ex)
+              {
+                  _logger.LogCritical(ex, "[ScannerService] There was an issue writing to the DB. Chunk {ChunkNumber} did not save to DB. If debug mode, series to check will be printed", chunk);
+                  foreach (var series in nonLibrarySeries)
+                  {
+                      _logger.LogDebug("[ScannerService] There may be a constraint issue with {SeriesName}", series.OriginalName);
+                  }
+                  await _messageHub.Clients.All.SendAsync(SignalREvents.ScanLibraryError,
+                      MessageFactory.ScanLibraryError(library.Id));
+                  continue;
+              }
               _logger.LogInformation(
                   "[ScannerService] Processed {SeriesStart} - {SeriesEnd} series in {ElapsedScanTime} milliseconds for {LibraryName}",
                   chunk * chunkInfo.ChunkSize, (chunk * chunkInfo.ChunkSize) + nonLibrarySeries.Count, totalTime, library.Name);

API/SignalR/MessageFactory.cs

@@ -96,5 +96,17 @@ namespace API.SignalR
                 }
             };
         }
+
+        public static SignalRMessage ScanLibraryError(int libraryId)
+        {
+            return new SignalRMessage
+            {
+                Name = SignalREvents.ScanLibraryError,
+                Body = new
+                {
+                    LibraryId = libraryId,
+                }
+            };
+        }
     }
 }

API/SignalR/SignalREvents.cs

@@ -11,5 +11,6 @@
         public const string ScanLibraryProgress = "ScanLibraryProgress";
         public const string OnlineUsers = "OnlineUsers";
         public const string SeriesAddedToCollection = "SeriesAddedToCollection";
+        public const string ScanLibraryError = "ScanLibraryError";
     }
 }

UI/Web/src/app/_services/message-hub.service.ts

@@ -18,7 +18,8 @@ export enum EVENTS {
   SeriesAdded = 'SeriesAdded',
   ScanLibraryProgress = 'ScanLibraryProgress',
   OnlineUsers = 'OnlineUsers',
-  SeriesAddedToCollection = 'SeriesAddedToCollection'
+  SeriesAddedToCollection = 'SeriesAddedToCollection',
+  ScanLibraryError = 'ScanLibraryError'
 }
 
 export interface Message<T> {
@@ -93,6 +94,16 @@ export class MessageHubService {
       });
     });
 
+    this.hubConnection.on(EVENTS.ScanLibraryError, resp => {
+      this.messagesSource.next({
+        event: EVENTS.ScanLibraryError,
+        payload: resp.body
+      });
+      if (this.isAdmin) {
+        this.toastr.error('Library Scan had a critical error. Some series were not saved. Check logs');
+      }
+    });
+
     this.hubConnection.on(EVENTS.SeriesAdded, resp => {
       this.messagesSource.next({
         event: EVENTS.SeriesAdded,