properly update plex part keys (#1666)

CHANGELOG.md

@@ -18,6 +18,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
     - This will apply whenever a deco template is missing, or when a deco template item cannot be found for the current time
     - Effectively, this sets a default watermark for the entire playout
 
+### Fixed
+- Fix some cases of 404s from Plex when files were replaced and scanning the library from ETV didn't help
+
 ## [0.8.6-beta] - 2024-04-03
 ### Added
 - Add `show_studio` and `show_content_rating` to search index for seasons and episodes

ErsatzTV.Infrastructure/Data/Repositories/PlexMovieRepository.cs

@@ -253,12 +253,19 @@ public class PlexMovieRepository : IPlexMovieRepository
             new { version.Name, version.DateAdded, version.Id });
 
         // media file
-        MediaFile file = version.MediaFiles.Head();
-        MediaFile incomingFile = incomingVersion.MediaFiles.Head();
+        if (version.MediaFiles.Head() is PlexMediaFile file &&
+            incomingVersion.MediaFiles.Head() is PlexMediaFile incomingFile)
+        {
             file.Path = incomingFile.Path;
+            file.Key = incomingFile.Key;
 
             await dbContext.Connection.ExecuteAsync(
                 @"UPDATE MediaFile SET Path = @Path WHERE Id = @Id",
                 new { file.Path, file.Id });
+
+            await dbContext.Connection.ExecuteAsync(
+                @"UPDATE PlexMediaFile SET Key = @Key WHERE Id = @Id",
+                new { file.Key, file.Id });
+        }
     }
 }

ErsatzTV.Infrastructure/Data/Repositories/PlexTelevisionRepository.cs

@@ -300,9 +300,7 @@ public class PlexTelevisionRepository : IPlexTelevisionRepository
         foreach (PlexEpisode plexEpisode in maybeExisting)
         {
             var result = new MediaItemScanResult<PlexEpisode>(plexEpisode) { IsAdded = false };
-
-            // deepScan isn't needed here since we create our own plex etags
-            if (plexEpisode.Etag != item.Etag)
+            if (plexEpisode.Etag != item.Etag || deepScan)
             {
                 foreach (BaseError error in await UpdateEpisodePath(dbContext, plexEpisode, item))
                 {
@@ -537,16 +535,20 @@ public class PlexTelevisionRepository : IPlexTelevisionRepository
             version.DateAdded = incomingVersion.DateAdded;
 
             // media file
-            MediaFile file = version.MediaFiles.Head();
-            MediaFile incomingFile = incomingVersion.MediaFiles.Head();
 
+            if (version.MediaFiles.Head() is PlexMediaFile file &&
+                incomingVersion.MediaFiles.Head() is PlexMediaFile incomingFile)
+            {
                 _logger.LogDebug(
-                "Updating plex episode (key {Key}) path from {Existing} to {Incoming}",
+                    "Updating plex episode (key {Key}) file key from {FK1} => {FK2}, path from {Existing} to {Incoming}",
                     existing.Key,
+                    file.Key,
+                    incomingFile.Key,
                     file.Path,
                     incomingFile.Path);
 
                 file.Path = incomingFile.Path;
+                file.Key = incomingFile.Key;
 
                 await dbContext.Connection.ExecuteAsync(
                     @"UPDATE MediaVersion SET Name = @Name, DateAdded = @DateAdded WHERE Id = @Id",
@@ -556,6 +558,11 @@ public class PlexTelevisionRepository : IPlexTelevisionRepository
                     @"UPDATE MediaFile SET Path = @Path WHERE Id = @Id",
                     new { file.Path, file.Id });
 
+                await dbContext.Connection.ExecuteAsync(
+                    @"UPDATE PlexMediaFile SET Key = @Key WHERE Id = @Id",
+                    new { file.Key, file.Id });
+            }
+
             return Option<BaseError>.None;
         }
         catch (Exception)

ErsatzTV.Infrastructure/Plex/PlexEtag.cs

@@ -36,6 +36,9 @@ public class PlexEtag
             // media part id
             foreach (PlexPartResponse part in media.Part)
             {
+                bw.Write((byte)FieldKey.Key);
+                bw.Write(part.Key);
+                
                 bw.Write((byte)FieldKey.PartId);
                 bw.Write(part.Id);
 
@@ -214,6 +217,9 @@ public class PlexEtag
             // media part id
             foreach (PlexXmlPartResponse part in media.Part)
             {
+                bw.Write((byte)FieldKey.Key);
+                bw.Write(part.Key);
+                
                 bw.Write((byte)FieldKey.PartId);
                 bw.Write(part.Id);
 
@@ -326,6 +332,7 @@ public class PlexEtag
         Art = 21,
 
         File = 30,
+        Key = 31,
 
         ChildCount = 40,
         Smart = 41, // smart collection bool