timothyandClaude Opus 4.8 94ebf34ccd
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feat(api): optimistic-concurrency contract for replace-all PUTs — PR1 infra + Block reference (#253)
Adds the shared optimistic-concurrency contract so a stale second tab can no longer
silently overwrite a fresher edit. PR1 lands the infra + the Block reference aggregate;
PRs 2–4 fan the same recipe across the other 8 roots (design: #253#issuecomment-8472).

Contract
- `IVersionedAggregate` (`int Version`) on all 9 replace-all roots (ProgramSchedule,
  Block, Template, DecoTemplate, Playlist, Collection, Playout, MultiCollection,
  RerunCollection), EF-mapped `.IsConcurrencyToken()`; one dual-provider migration
  `AddAggregateVersions` (nullable:false, default 0).
- Strong `ETag` of `Version` on the aggregate GET; `If-Match` on the PUT; mismatch →
  412 (distinct from the §3a 409 build-lock guard). Successful PUT returns the new ETag.
- `PreconditionFailedError : BaseError` → 412 in `ApiResults.ToErrorResult`;
  `ConcurrencyHeaders.ParseIfMatch/SetETag`; malformed If-Match → 400; `*`/absent =
  Phase-1 force-write.

Block reference wiring
- Handler: standalone `Either` via `CheckVersion` AFTER validation (never through
  `Apply`, which Join()-flattens the subtype to 422), unconditional `Version++`,
  `SaveChangesWithConcurrencyGuard` backstop (DbUpdateConcurrencyException → 412).
- `BlockViewModel.Version` (header-only, not echoed in the body); controller sets the
  ETag on GET items and on the successful PUT.
- SPA: `client.requestWithMeta` seam; `blocks.getBlockItemsWithMeta` + `replaceBlock`
  If-Match/ETag round-trip; `BlockEditor` holds the ETag, sends If-Match, and on 412
  opens a blocking "changed elsewhere — reload" dialog.

Tests
- Handler contract tests: stale-If-Match → 412 (no mutation), matching/absent → success
  + bump, no-op save still bumps, and a two-context racing save → 412; proven
  non-vacuous (drop `.IsConcurrencyToken()` → the race test fails).
- Controller tests: malformed If-Match → 400, If-Match threaded to the command, ETag on
  GET/PUT, 412 passthrough. SPA: requestWithMeta ETag, replaceBlock If-Match, 412 dialog.

Docs: api-conventions §7a, spa-conventions §4a, domain-model glossary, decisions log.

Refs #253
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-11 16:51:59 +02:00
2025-11-26 10:49:01 -06:00
2022-04-28 06:56:01 -05:00
2025-11-11 06:12:46 -06:00
2021-02-08 21:13:53 -06:00
2026-07-02 19:24:06 +02:00
2023-08-13 09:33:33 -05:00
2025-11-26 10:49:01 -06:00
2026-02-24 15:27:51 -06:00

ErsatzTV

ErsatzTV lets you transform your media library into a personalized, live TV experience - complete with EPG, channel scheduling, and seamless streaming to all your devices. Rediscover your content, your way.

contact features community

epg-example

How It Works

  1. Install ErsatzTV: Download and set up the server on your system.
  2. Add Your Media: Connect your media libraries and collections.
  3. Create Channels: Design and schedule your own live channels.
  4. Stream Anywhere: Watch on any device with IPTV and EPG support.

Key Features

  • Custom channels: Create and schedule your own live TV channels.
  • IPTV & EPG: Stream with IPTV and Electronic Program Guide support.
  • Hardware Transcoding: High-performance streaming with hardware acceleration (NVENC, QSV, VAAPI, AMF, VideoToolbox)
  • Media Server Integration: Connect Plex, Jellyfin, Emby and more.
  • Music & Subtitles: Mix music videos and enjoy subtitle support.
  • Open Source: Free, open, and community-driven project.

Documentation

Documentation is available at ersatztv.org.

License

This project is inspired by pseudotv-plex and the dizquetv fork and is released under the zlib license.

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