refactor(backend): unify YouTube track creation via a provisioner

Track get-or-create for YouTube videos was duplicated between the old GetYouTubeTrackStream query handler (which also wrote to the database) and AddYouTubeTrackToPlayList, with frontend-supplied metadata (title/artist/duration/thumbnail) trusted at add-to-playlist time instead of resolving it server-side. Extract YouTubeTrackProvisioner as the single get-or-create path, resolving structured artist refs (id + name) from YouTube Music so multi-artist songs map to distinct Artist rows. Rename GetYouTubeTrackStream to ResolveYouTubeTrackStream (it writes, so it is a command, not a query) and delegate to the provisioner. AddYouTubeTrackToPlayList slims down to (UserId, PlayListId, VideoId) since all metadata now comes from the provisioner/YouTube API.
2026-07-17 17:56:37 +02:00
parent b1618a39c4
commit 4a802e44a3
11 changed files with 271 additions and 224 deletions
@@ -0,0 +1,77 @@
+using ErrorOr;
+using Mediator;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using Musify.Application.Contracts;
+using Musify.Application.Services;
+using Musify.Application.YouTube.Responses;
+using Musify.Domain.Entities;
+
+namespace Musify.Application.YouTube
+{
+    public record ResolveYouTubeTrackStreamCommand(string VideoId, long UserId)
+        : ICommand<ErrorOr<YouTubeStreamResponse>>;
+
+    public class ResolveYouTubeTrackStreamCommandHandler(
+        IDatabase database,
+        IYouTubeMusicService youTubeMusicService,
+        YouTubeTrackProvisioner provisioner,
+        TrackStreamIssuer streamIssuer,
+        ILogger<ResolveYouTubeTrackStreamCommandHandler> logger)
+        : ICommandHandler<ResolveYouTubeTrackStreamCommand, ErrorOr<YouTubeStreamResponse>>
+    {
+        public async ValueTask<ErrorOr<YouTubeStreamResponse>> Handle(ResolveYouTubeTrackStreamCommand request, CancellationToken cancellationToken)
+        {
+            var track = await provisioner.FindAsync(request.VideoId, cancellationToken);
+
+            if (track is not null && track.IsAudioProcessed)
+            {
+                var serverStream = await streamIssuer.IssueAsync(track.Id, track.AudioFolderName, request.UserId, cancellationToken);
+                return new YouTubeStreamResponse(
+                    YouTubeStreamMode.Server,
+                    serverStream.ManifestUrl,
+                    serverStream.Ticket,
+                    serverStream.ExpiresInSeconds,
+                    track.Id);
+            }
+
+            var streamInfo = await youTubeMusicService.GetAudioStreamAsync(request.VideoId, cancellationToken);
+            if (streamInfo.IsError)
+                return streamInfo.Errors;
+
+            if (track is null)
+            {
+                var provisionResult = await provisioner.GetOrCreateAsync(request.VideoId, cancellationToken);
+                if (!provisionResult.IsError)
+                    track = provisionResult.Value.Track;
+                else
+                    logger.LogWarning("Could not provision YouTube track {VideoId}: {Error}", request.VideoId, provisionResult.FirstError.Description);
+            }
+
+            if (track is not null)
+            {
+                await database.ListeningHistories.AddAsync(new ListeningHistory
+                {
+                    UserId = request.UserId,
+                    TrackId = track.Id,
+                }, cancellationToken);
+
+                try
+                {
+                    await database.SaveChangesAsync(cancellationToken);
+                }
+                catch (DbUpdateException exception)
+                {
+                    logger.LogWarning(exception, "Failed to record listening history for YouTube video {VideoId}", request.VideoId);
+                }
+            }
+
+            return new YouTubeStreamResponse(
+                YouTubeStreamMode.YouTube,
+                streamInfo.Value.Url,
+                string.Empty,
+                streamInfo.Value.ExpiresInSeconds,
+                track?.Id ?? Guid.Empty);
+        }
+    }
+}