New: Split out metadata refresh from disk rescan

src/NzbDrone.Core/Jobs/TaskManager.cs

@@ -11,6 +11,7 @@ using NzbDrone.Core.Housekeeping;
 using NzbDrone.Core.ImportLists;
 using NzbDrone.Core.Indexers;
 using NzbDrone.Core.Lifecycle;
+using NzbDrone.Core.MediaFiles.Commands;
 using NzbDrone.Core.Messaging.Commands;
 using NzbDrone.Core.Messaging.Events;
 using NzbDrone.Core.Music.Commands;
@@ -65,6 +66,7 @@ namespace NzbDrone.Core.Jobs
                     new ScheduledTask { Interval = 6 * 60, TypeName = typeof(ApplicationUpdateCommand).FullName },
                     new ScheduledTask { Interval = 6 * 60, TypeName = typeof(CheckHealthCommand).FullName },
                     new ScheduledTask { Interval = 24 * 60, TypeName = typeof(RefreshArtistCommand).FullName },
+                    new ScheduledTask { Interval = 24 * 60, TypeName = typeof(RescanFoldersCommand).FullName },
                     new ScheduledTask { Interval = 24 * 60, TypeName = typeof(HousekeepingCommand).FullName },
 
                     new ScheduledTask

src/NzbDrone.Core/MediaFiles/Commands/RescanFoldersCommand.cs

@@ -7,17 +7,22 @@ namespace NzbDrone.Core.MediaFiles.Commands
     {
         public RescanFoldersCommand()
         {
+            // These are the settings used in the scheduled task
+            Filter = FilterFilesType.Known;
+            AddNewArtists = true;
         }
 
-        public RescanFoldersCommand(List<string> folders, FilterFilesType filter, List<int> artistIds)
+        public RescanFoldersCommand(List<string> folders, FilterFilesType filter, bool addNewArtists, List<int> artistIds)
         {
             Folders = folders;
             Filter = filter;
+            AddNewArtists = addNewArtists;
             ArtistIds = artistIds;
         }
 
         public List<string> Folders { get; set; }
         public FilterFilesType Filter { get; set; }
+        public bool AddNewArtists { get; set; }
         public List<int> ArtistIds { get; set; }
 
         public override bool SendUpdatesToClient => true;

src/NzbDrone.Core/MediaFiles/DiskScanService.cs

@@ -16,14 +16,13 @@ using NzbDrone.Core.MediaFiles.TrackImport;
 using NzbDrone.Core.Messaging.Commands;
 using NzbDrone.Core.Messaging.Events;
 using NzbDrone.Core.Music;
-using NzbDrone.Core.Parser.Model;
 using NzbDrone.Core.RootFolders;
 
 namespace NzbDrone.Core.MediaFiles
 {
     public interface IDiskScanService
     {
-        void Scan(List<string> folders = null, FilterFilesType filter = FilterFilesType.Known, List<int> artistIds = null);
+        void Scan(List<string> folders = null, FilterFilesType filter = FilterFilesType.Known, bool addNewArtists = false, List<int> artistIds = null);
         IFileInfo[] GetAudioFiles(string path, bool allDirectories = true);
         string[] GetNonAudioFiles(string path, bool allDirectories = true);
         List<IFileInfo> FilterFiles(string basePath, IEnumerable<IFileInfo> files);
@@ -68,7 +67,7 @@ namespace NzbDrone.Core.MediaFiles
             _logger = logger;
         }
 
-        public void Scan(List<string> folders = null, FilterFilesType filter = FilterFilesType.Known, List<int> artistIds = null)
+        public void Scan(List<string> folders = null, FilterFilesType filter = FilterFilesType.Known, bool addNewArtists = false, List<int> artistIds = null)
         {
             if (folders == null)
             {
@@ -145,7 +144,7 @@ namespace NzbDrone.Core.MediaFiles
             {
                 Filter = filter,
                 IncludeExisting = true,
-                AddNewArtists = true
+                AddNewArtists = addNewArtists
             };
 
             var decisions = _importDecisionMaker.GetImportDecisions(mediaFileList, null, null, config);
@@ -275,7 +274,7 @@ namespace NzbDrone.Core.MediaFiles
 
         public void Execute(RescanFoldersCommand message)
         {
-            Scan(message.Folders, message.Filter, message.ArtistIds);
+            Scan(message.Folders, message.Filter, message.AddNewArtists, message.ArtistIds);
         }
     }
 }

src/NzbDrone.Core/Music/Services/AlbumEditedService.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using NzbDrone.Core.MediaFiles;
 using NzbDrone.Core.MediaFiles.Commands;
 using NzbDrone.Core.Messaging.Commands;
 using NzbDrone.Core.Messaging.Events;
@@ -33,7 +34,7 @@ namespace NzbDrone.Core.Music
                     tracks.ForEach(x => x.TrackFileId = 0);
                     _trackService.SetFileIds(tracks);
 
-                    _commandQueueManager.Push(new RescanFoldersCommand());
+                    _commandQueueManager.Push(new RescanFoldersCommand(null, FilterFilesType.Matched, false, null));
                 }
             }
         }

src/NzbDrone.Core/Music/Services/RefreshAlbumService.cs

@@ -318,7 +318,7 @@ namespace NzbDrone.Core.Music
         {
             bool updated = false;
 
-            var updatedMusicbrainzAlbums = new HashSet<string>();
+            HashSet<string> updatedMusicbrainzAlbums = null;
 
             if (lastUpdate.HasValue && lastUpdate.Value.AddDays(14) > DateTime.UtcNow)
             {

src/NzbDrone.Core/Music/Services/RefreshArtistService.cs

@@ -285,26 +285,19 @@ namespace NzbDrone.Core.Music
                 _logger.Trace("Skipping rescan. Reason: not after automatic refreshes");
                 shouldRescan = false;
             }
-
-            if (!shouldRescan)
+            else if (!infoUpdated)
             {
-                return;
+                _logger.Trace("Skipping rescan. Reason: no metadata updated");
+                shouldRescan = false;
             }
 
-            try
+            if (shouldRescan)
             {
-                // If some metadata has been updated then rescan unmatched files.
-                // Otherwise only scan files that haven't been seen before.
-                var filter = infoUpdated ? FilterFilesType.Matched : FilterFilesType.Known;
-                _logger.Trace($"InfoUpdated: {infoUpdated}, using scan filter {filter}");
-
+                // some metadata has updated so rescan unmatched
+                // (but don't add new artists to reduce repeated searches against api)
                 var folders = _rootFolderService.All().Select(x => x.Path).ToList();
 
-                _commandQueueManager.Push(new RescanFoldersCommand(folders, filter, artistIds));
-            }
-            catch (Exception e)
-            {
-                _logger.Error(e, "Couldn't rescan");
+                _commandQueueManager.Push(new RescanFoldersCommand(folders, FilterFilesType.Matched, false, artistIds));
             }
         }
 

src/NzbDrone.Core/RootFolders/RootFolderService.cs

@@ -104,7 +104,7 @@ namespace NzbDrone.Core.RootFolders
 
             _rootFolderRepository.Insert(rootFolder);
 
-            _commandQueueManager.Push(new RescanFoldersCommand(new List<string> { rootFolder.Path }, FilterFilesType.None, null));
+            _commandQueueManager.Push(new RescanFoldersCommand(new List<string> { rootFolder.Path }, FilterFilesType.None, true, null));
 
             GetDetails(rootFolder);