Files
ersatztv/ErsatzTV.Application/Channels/Commands/BulkMoveChannelsToGroupHandler.cs
T
timothyandClaude Opus 4.8 a1bd303cce
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fix(app): post-commit side effects on CancellationToken.None + guide-xml/empty-list hardening (#254)
Backend mutation-hardening cluster from the 2026-07-11 mutation-safety audit
sweep (adversarial-reviewer #22/#23), the parallel-safe backend-isolated slice.

audit#22 F4 — standardize post-commit enqueues on CancellationToken.None:
20 command handlers under MediaCollections/, ProgramSchedules/, Playouts/,
Channels/ threaded the request cancellationToken into work that runs AFTER
SaveChangesAsync commits (WriteAsync rebuild/refresh enqueues, mediator.Publish,
reindex, cache Refresh, and post-commit lookups that gate an enqueue). A late
client-disconnect then turns an already-durable commit into a thrown request AND
drops the side effect. Generalizes the #251 deco-handler fix. Excludes
BuildPlayoutHandler (worker/background token, not a client-disconnect token),
the config/FFmpeg multi-upsert handlers (partial-commit case, separate
follow-up), and response-projection reloads (correctly keep the request token).

audit#22 F2 — DeleteChannelHandler/DeletePlayoutHandler now delete the channel
guide {number}.xml through IFileSystem.File.Delete (observable under
MockFileSystem) and BEFORE the commit (a post-commit delete orphans the xml on a
crash; the xml is regenerable on demand, so pre-commit delete is the safe order).

audit#23 F4 — ReplacePlayoutAlternateScheduleItemsHandler rejects an empty item
list in the handler (not only the controller pre-guard) so a direct caller can't
trip the Max()-on-empty crash.

Docs: api-conventions.md §7a (post-commit token convention + boundaries),
decisions.md entry (rationale, sweep scope, #253 PR2-4 coordination note).
Tests: guide-cache-delete-through-FS for both delete handlers, empty-list guard.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-11 17:42:45 +02:00

65 lines
2.4 KiB
C#

using System.Threading.Channels;
using ErsatzTV.Core;
using ErsatzTV.Core.Errors;
using ErsatzTV.Core.Interfaces.Search;
using ErsatzTV.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;
using static ErsatzTV.Application.Channels.ChannelValidations;
using Channel = ErsatzTV.Core.Domain.Channel;
namespace ErsatzTV.Application.Channels;
public class BulkMoveChannelsToGroupHandler(
IDbContextFactory<TvContext> dbContextFactory,
ChannelWriter<IBackgroundServiceRequest> workerChannel,
ISearchTargets searchTargets)
: IRequestHandler<BulkMoveChannelsToGroup, Either<BaseError, Unit>>
{
public async Task<Either<BaseError, Unit>> Handle(
BulkMoveChannelsToGroup request,
CancellationToken cancellationToken)
{
if (request.ChannelIds.Count == 0)
{
return Left<BaseError, Unit>(BaseError.New("At least one channel id is required"));
}
Validation<BaseError, string> groupValidation = ValidateGroup(request.Group);
if (groupValidation.IsFail)
{
return Left<BaseError, Unit>(groupValidation.FailToSeq().Head());
}
await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
await using var transaction = await dbContext.Database.BeginTransactionAsync(cancellationToken);
List<int> channelIds = request.ChannelIds.Distinct().ToList();
List<Channel> channels = await dbContext.Channels
.Where(c => channelIds.Contains(c.Id))
.ToListAsync(cancellationToken);
if (channels.Count != channelIds.Count)
{
var found = channels.Select(c => c.Id).ToHashSet();
int missingId = channelIds.First(id => !found.Contains(id));
return Left<BaseError, Unit>(new NotFoundError($"Channel {missingId} does not exist."));
}
foreach (Channel channel in channels)
{
channel.Group = request.Group;
}
await dbContext.SaveChangesAsync(cancellationToken);
await transaction.CommitAsync(cancellationToken);
searchTargets.SearchTargetsChanged();
// post-commit side effect runs on CancellationToken.None so a late request cancellation
// can't abort it after the commit landed (#254)
await workerChannel.WriteAsync(new RefreshChannelList(), CancellationToken.None);
return Right<BaseError, Unit>(Unit.Default);
}
}