[InstaZDLL]

Summary

RFC-024 and its implementation, in one PR: four discovery features built from what the server already holds, plus one narrow, optional outbound source.

1. Lyrics from LRCLIB, opt-in. WAVEFLOW_LYRICS_PROVIDERS=lrclib turns it on. It is empty by default, and it is a separate switch from WAVEFLOW_METADATA_PROVIDERS. A track with no lyrics of its own (no embedded or sidecar sheet with words in it, no upload) is looked up on demand, never at scan time, matched on artist, title, album and duration. The sheet is served:

   • on the native lyrics route and its download, with source: "lrclib";
   • on getLyricsBySongId, and on getLyrics as a fallback, in the frozen structuredLyrics shape with no new attribute;
   • in the web client, which credits it ("Lyrics from LRCLIB").

2. Statistics. GET /api/v2/stats?period=7d|30d|365d|all&utc_offset_minutes=&limit= answers:

   • totals: listens, estimated listening time, and distinct tracks, albums and artists;
   • top tracks, albums, artists and genres;
   • a per-day or per-month timeline;
   • the period's first and last listen.

   A new Statistics page shows them in the web client.

3. Mixes from local data only. GET /api/v2/mixes and GET /api/v2/mixes/{mix_id} serve most played, never played, forgotten favourites, recently added, and the account's top genres and decades. A mix is deterministic per account and per day, capped per artist, and interleaved. The home page shows them as a shelf, with a page per mix. They are not on Subsonic (RFC decision 7 says why).

4. Local fallback for similar songs. getSimilarSongs, getSimilarSongs2 and the new GET /api/v2/similar-songs/{id} take a configured provider's neighbours first. When the provider names none the caller can see, or when no provider is configured (the default), they use the catalogue's own neighbours: co-credits, shared genres, a close era, and the caller's own co-listening.

Decisions (RFC-024)

• D1. LRCLIB has its own ordered list, empty by default. A lyrics lookup sends a title, an album and a duration at play time, which is a different consent from asking about an artist's name. The client is the server's own, built by src/outbound.rs (no redirect, no proxy from the environment). It is not waveflow_core::metadata::lrclib, which follows redirects and reads unbounded bodies. The body is capped at 1 MiB locally. The User-Agent is WaveFlowServer/<version> (https://github.com/InstaZDLL/waveflow-server), as LRCLIB asks.

• D2. The file and the uploads always win; LRCLIB only fills an empty answer. A match more than 2 s off the track's duration is a miss.

• D3. Lookups are made on demand, and the answering path waits for them at most 4 s. This is a deliberate, argued departure from RFC-011 D6: lyrics are asked once per listen. The rest of D6 holds:

  • the writer gate is taken only after the network I/O;
  • one request per key is in flight;
  • requests are rate-limited, with at most 64 in flight;
  • nothing runs at scan time.

• D4. An instance-wide cache, lyrics_lookup (migration 20261027020000), keyed by a BLAKE3 digest of what was sent.

  • A hit is kept 30 days, a miss 7 days, an instrumental 30 days.
  • An unreached lookup writes nothing.
  • A stale row is served while it refreshes.
  • Tenancy is checked before the key is computed.

• D5. The Subsonic shape is unchanged, and uploads stay off the façade (RFC-012). With the variable empty, no surface changes.

• D6. Statistics are per account, built from play_event rows with submission=1.

  • Every query binds the user id first, joins through library_member with pe.user_id = m.user_id, and reads available tracks only.
  • Artists and genres are grouped by canonical name.
  • Listening time is labelled an estimate.

• D7. Mixes:

  • candidates come from a bounded pool of 2,000; random pools start at a seeded pivot in the id space;
  • they are ordered by a seeded BLAKE3 hash, capped at max(2, size/10) per artist, interleaved, and read through the shared song projection;
  • an empty mix answers 404.

  They are not on Subsonic: virtual playlists would mean writable UUID playlists that change daily, and the getAlbumList2 types are a closed set.

• D8. Scored local neighbours (co-credit, genre, an era bonus, co-listen), top 20, feed the existing balanced draw. This is an observable wire change on a frozen method: with no provider, both similar-songs methods now answer songs instead of {}. The RFC justifies it. It is recorded in docs/subsonic-compatibility.md and as an amendment to RFC-002, with an item to re-check in the next client campaign.

Test plan

• cargo fmt --all --check: clean.

• cargo clippy --all-targets --all-features -- -D warnings: clean.

• cargo test --all-features (full): every target green, 617 tests, 0 failures.

• New target tests/discovery.rs, 19 tests, registered in Cargo.toml. Every LRCLIB test runs against a fake on loopback; the suite never reaches lrclib.net. Covered:

  • LRCLIB:
    • off means no request;
    • one request, credited, then cached, and the download serves .lrc;
    • files and uploads win on both surfaces;
    • no source on the façade, at the service and on the wire, and the getLyrics fallback;
    • the miss and instrumental TTLs;
    • a 503, a 302 (not followed) and a 2 MiB answer write nothing and are asked again;
    • concurrent asks make one request;
    • the wait is bounded, and a slow answer lands for the next listen;
    • a stale row is served while it refreshes;
    • another account's track is 404 and never looked up.
  • Statistics: only the caller's submissions count, on tracks still reached (leaving a library takes them out); the route validates its parameters.
  • Mixes: listing, variety, per-day determinism, forgotten favourites, tenancy.
  • Similar songs:
    • local neighbours by genre, by co-credit and by co-listening;
    • a foreign artist never takes a neighbour's place;
    • the façade and the native route both answer without a provider.

• Updated tests:

  • enrichment.rs: count_absent_yields_at_most_fifty now expects the local draw with no provider, and the_artist_s_own_tracks_are_in_the_draw strips the shared genre so it still proves its point.
  • subsonic_browse.rs: the similar-songs methods now draw songs.

• Unit tests:

  • LRCLIB: judging a record, the duration tolerance, key folding, the User-Agent, sheet choice;
  • statistics: period starts, timeline filling, query bounds;
  • mixes: variety, seeding, mix ids;
  • neighbours: the score caps.

• Webapp:

  • bun --cwd=webapp install and bun --cwd=webapp run build, on a fresh dist;
  • biome: no new diagnostics;
  • vitest: 238 passed, with the new lib/mixes.test.ts;
  • full Playwright: 292 passed, 18 skipped (project-specific), on port 4791. WAVEFLOW_E2E_PORT was added so worktrees do not reuse each other's preview.

  The e2e mocks answer the new routes. New specs cover:

  • the shelf: its request is scoped to the library, it plays, it opens the mix page, and it hides while filtering;
  • no shelf when nothing is offered;
  • a mix that is gone;
  • the statistics page and its periods;
  • light-theme axe on the shelf and the statistics page;
  • the LRCLIB credit, and its absence.

  The mobile sheet count was updated for the new Statistics entry.

Inversions

For each one, the fix was reverted, its test run and seen to fail for its own reason, then restored. Restores rewrite the file and bump its mtime, so cargo rebuilds; every run below compiled the inverted source. git diff was clean afterwards.

Inversion	Test that failed, and why
upload check dropped from remote_sheet	a_track_with_lyrics_of_its_own_is_never_looked_up: the façade answered an LRCLIB sheet for an uploaded track
empty WAVEFLOW_LYRICS_PROVIDERS builds the engine anyway	nothing_is_asked_while_lrclib_is_not_named: is_enabled() was true
miss cached for the hit TTL	a_miss_and_an_instrumental_are_cached_as_answers: 30 d instead of 7 d
a 503 cached as a miss	an_unreached_lookup_writes_nothing_and_is_asked_again: asked 1 instead of 2
in-flight key made unique per ask	concurrent_asks_make_one_request: 6 requests instead of 1
answering path waits without a bound	a_slow_answer_is_not_waited_for_…: the first answer carried the sheet
redirects followed (Policy::limited)	an_unreached_lookup_…: the redirect's sheet was served
body cap raised to 8 MiB	an_unreached_lookup_…: the oversized answer was served
duration tolerance raised to 100 s	unit another_duration_is_another_recording: Hit instead of Miss
façade sheet credited (remote_sheet(…, true))	the_facade_serves_the_sheet_without_a_source: the service sheet had a source
Subsonic node emits source	the_facade_serves_the_sheet_without_a_source: the wire carried it
pe.user_id = m.user_id dropped from statistics	statistics_count_the_caller_s_listens_…: 10 listens instead of 5
now-playing counted as a listen	same test: 6 instead of 5
artist cap set to the mix size	a_mix_is_varied_and_the_same_all_day: 16 tracks by one artist instead of 2
seed salted per request	same test: two asks on one day answered two orders
mix pool joined on any membership	a_mix_holds_only_the_caller_s_tracks: a foreign genre answered 200 instead of 404
local fallback disabled	the_similar_songs_methods_answer_without_a_provider: 1 song instead of 2
tenancy dropped from the genre-neighbour query	a_shared_genre_makes_a_local_neighbour_and_nothing_foreign_does: twenty foreign artists pushed the visible neighbour out
web: shelf shown while filtering	Playwright offers the day's mixes…: shelf count 1 instead of 0
web: mixes asked unscoped	same spec: library_id missing from the request
web: LRCLIB credit gated on another source	Playwright credits LRCLIB…: no credit text

Two inversions passed at first: the façade source and the neighbour tenancy. Each is protected by a second layer (the Subsonic node builder, and the membership filter in the draw). Both tests were strengthened so each layer is proved on its own, and both inversions now fail.

After review and merges

• main merged twice: feat: smart playlists and podcasts (RFC-025) #333 (conflicts resolved by keeping both sides; the mobile sheet now lists 17 entries) and feat: hardening — bounded reads, ffmpeg protocols, embedded api reference, disabled accounts (RFC-023) #332 (no conflict). The LRCLIB client now reads through feat: hardening — bounded reads, ffmpeg protocols, embedded api reference, disabled accounts (RFC-023) #332's outbound::read_bounded_body, still under its 1 MiB lyrics cap; the size-cap inversion was re-run through it.
• CodeRabbit fixes: doc comment placement (6527f4b); duration checked before an instrumental verdict (2e963e4); statistics and mixes count listens per track before joining (303b4c3; on 10,000 tracks and 50,000 listens, debug build: list_mixes 2.2–3.3 s → 0.85–1.0 s, statistics 30d 7.3 s → 0.95 s); an alert when a mix cannot be opened (360d19e).
• Gates after both merges: fmt and clippy clean, cargo test --all-features 627 tests and 0 failures, vitest 244/244, Playwright 310 passed and 18 skipped on a fresh build.

Deferred

• Mixes on Subsonic (an open question in the RFC).
• Eviction of lyrics_lookup.
• Uploaded lyrics stay off Subsonic, per RFC-012.
• Expected merge conflicts, all additive: src/config.rs, webapp/src/state/i18n.tsx, webapp/src/main.tsx, docs/operations.md, docs/privacy.md, webapp/playwright.config.ts (another branch also adds WAVEFLOW_E2E_PORT), and the e2e spec.

Summary by CodeRabbit

• Nouveautés
  • Consultez vos statistiques d’écoute sur 7 jours, 30 jours, 365 jours ou toute la période, avec des totaux, une chronologie et des classements.
  • Découvrez des mixes personnalisés depuis les albums ou sur leur propre page.
  • Obtenez des suggestions de chansons similaires issues du catalogue, même sans fournisseur de métadonnées configuré.
  • Les paroles peuvent être recherchées sur LRCLIB si cette option est activée et qu’aucune parole propre au morceau n’est disponible. Leur source est indiquée dans l’interface.

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Walkthrough

La PR ajoute des paroles LRCLIB facultatives, des statistiques d’écoute, des mixes locaux et des chansons similaires. Elle expose ces fonctions dans les API du serveur et de l’application web, avec des tests et de la documentation associés.

Changes: Découverte musicale

Layer / File(s)	Summary
Recherche et intégration des paroles LRCLIB src/config.rs, src/lrclib.rs, src/database.rs, migrations-v2/20261027020000_lyrics_lookup.sql, src/services/remote_lyrics.rs, src/services/songs.rs, src/services/lyrics_uploads.rs, src/enrichment.rs, src/lib.rs, src/services/mod.rs, webapp/src/api/tracks.ts, webapp/src/components/lyrics-section.tsx, webapp/src/pages/playing-page.tsx, tests/discovery.rs, docs/operations.md, docs/privacy.md, docs/rfcs/*, docs/subsonic-compatibility.md	La configuration peut activer LRCLIB. Le moteur recherche les paroles manquantes, met en cache les résultats et les ajoute aux parcours de paroles existants. Le client web affiche leur provenance.
Statistiques, mixes et chansons similaires côté serveur src/services/statistics.rs, src/services/mixes.rs, src/services/local_similar.rs, src/services/artist_enrichment.rs, src/services/mod.rs, src/api/discovery.rs, src/api/mod.rs, src/lib.rs, tests/discovery.rs, tests/enrichment.rs, tests/subsonic_browse.rs	Les services calculent les statistiques à partir des écoutes soumises et des pistes accessibles. Ils créent des mixes locaux et utilisent le catalogue pour les chansons similaires lorsque les voisins du fournisseur ne sont pas disponibles. Les routes natives et Subsonic exposent les résultats correspondants.
Interface web de découverte webapp/src/api/*, webapp/src/components/*, webapp/src/lib/*, webapp/src/pages/*, webapp/src/main.tsx, webapp/src/state/*, webapp/src/styles/styles.css, webapp/e2e/studio-nocturne.spec.ts, webapp/playwright.config.ts	Le client web ajoute les API, les pages de statistiques et de mixes, ainsi qu’une étagère de mixes. Les tests E2E couvrent ces vues et l’attribution des paroles. La configuration E2E utilise le port configuré et échoue si ce port est occupé.
Documentation et validation Cargo.toml, CLAUDE.md, docs/api-v2-guide.md, docs/rfcs/*, docs/subsonic-compatibility.md, tests/discovery.rs, tests/enrichment.rs, tests/subsonic_browse.rs	La documentation décrit les routes et les comportements ajoutés. Cargo déclare la cible d’intégration discovery. Les tests couvrent les paroles, les statistiques, les mixes et les chansons similaires.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant User as Client
  participant LyricsService as Service de paroles
  participant LyricsLookup as Moteur LRCLIB
  participant LyricsCache as Cache lyrics_lookup
  participant LRCLIB
  User->>LyricsService: Demande les paroles d’un morceau
  LyricsService->>LyricsLookup: Recherche si aucune parole locale n’existe
  LyricsLookup->>LyricsCache: Lit le cache par fournisseur et clé
  LyricsCache-->>LyricsLookup: Résultat en cache ou absence
  LyricsLookup->>LRCLIB: Recherche distante si nécessaire
  LRCLIB-->>LyricsLookup: Paroles ou réponse sans résultat
  LyricsLookup->>LyricsCache: Enregistre le résultat mis en cache
  LyricsLookup-->>LyricsService: Retourne les paroles disponibles
  LyricsService-->>User: Fournit les paroles avec leur source

Loading

Merge Risk: Minimal · up to 377dc

Statistics and mixes are cached per session and the cache is cleared on every sign-in, sign-out and session expiry, so one account cannot see another's data. The other earlier concerns (day rollover and mix-open errors) have been fixed. No merge-blocking risk was found in the reviewed changes.

Security architecture risk: Low · up to 377dc

The new external lookup is disabled by default and has bounded requests. The inspected discovery and lyrics paths retain authentication and account-access checks. No introduced security defect was established, but deployment rollback and some verification coverage remain incomplete.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• observed — When the operator enables lyrics lookup, eligible requests across all accounts can disclose recording metadata, request timing, and the server's network address to LRCLIB. There is no per-account opt-in; this account-wide scope is explicitly documented. The request does not attach an account credential.

Security Findings and Attack Paths

• inferred — The supplied cross-account query-cache candidate is not substantiated by the inspected lifecycle. Although discovery query keys omit account identity, the shared QueryClient is cleared on login, logout, and session expiry. This existing protection remains in place; exact installed-library late-response behavior was not independently verified.

Trust Boundaries and Controls

• observed — Discovery handlers derive identity from authenticated read access rather than caller-selected account parameters. Lyrics resolution checks track membership before consulting the shared provider cache. Similar-song seed resolution and final song projection retain caller-scoped access checks.

Resilience and Maintainability Implications

• observed — The outbound failure boundary includes pacing, at most 64 pending or running lookups, a four-second caller wait, a configured request timeout, and a one-MiB response ceiling. Transport, timeout, decoding, and non-404 HTTP failures do not overwrite cached answers with misses, allowing later recovery.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 59.52% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 168 functions across 38 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		Le titre est précis et décrit les quatre changements principaux : LRCLIB, statistiques d’écoute, mixes et chansons similaires locales.
Description check		La description est complète. Elle présente l’objectif, les décisions techniques, les changements substantiels, les tests, les validations par inversion, les performances et les éléments différés. Elle…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
Review comments at @src/database.rs:
- Around line 2080-2081: Déplacez `lyrics_lookup_row` et `write_lyrics_lookup`
avant le bloc de documentation de `write_metadata_artist` ou après sa
définition, afin que le doc-comment existant reste attaché à
`write_metadata_artist` et que celui de `lyrics_lookup_row` ne soit pas fusionné
avec lui.

Review comments at @src/lrclib.rs:
- Around line 485-497: Dans `judge`, vérifiez la durée de l’enregistrement avant
de traiter `record.instrumental == Some(true)`. Conservez le verdict
`Instrumental` pour les durées conformes ou absentes, et renvoyez un échec
lorsque la durée dépasse `DURATION_TOLERANCE_SECS`.

Review comments at @src/services/mixes.rs:
- Around line 196-217: Mesurez le coût SQL de list_mixes sur un grand catalogue
en examinant les plans d’exécution et les temps des requêtes appelées par
list_mixes, notamment choose, taste_genres et taste_decades. Si ces mesures
révèlent un coût significatif, ajoutez un cache par compte, périmètre de
bibliothèque et jour, avec une invalidation adaptée aux changements du catalogue
et aux signaux d’écoute; ne l’ajoutez pas sans mesure préalable.

Review comments at @webapp/src/components/mix-shelves.tsx:
- Around line 37-38: Dans le bloc catch des actions du mix qui appellent getMix,
affichez un message d’erreur localisé afin de signaler l’échec de Lire ou
Ajouter à la file et permettre une nouvelle tentative ; conservez le finally qui
réactive les boutons.

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• Cargo.toml
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• docs/rfcs/RFC-002-waveflow-server-v2.md
• docs/rfcs/RFC-024-lyrics-stats-and-mixes.md
• docs/subsonic-compatibility.md
• migrations-v2/20261027020000_lyrics_lookup.sql
• src/api/discovery.rs
• src/api/mod.rs
• src/config.rs
• src/database.rs
• src/enrichment.rs
• src/lib.rs
• src/lrclib.rs
• src/services/artist_enrichment.rs
• src/services/local_similar.rs
• src/services/lyrics_uploads.rs
• src/services/mixes.rs
• src/services/mod.rs
• src/services/remote_lyrics.rs
• src/services/songs.rs
• src/services/statistics.rs
• tests/discovery.rs
• tests/enrichment.rs
• tests/subsonic_browse.rs
• webapp/e2e/studio-nocturne.spec.ts
• webapp/playwright.config.ts
• webapp/src/api/discovery.ts
• webapp/src/api/index.ts
• webapp/src/api/queries.ts
• webapp/src/api/tracks.ts
• webapp/src/components/icons.tsx
• webapp/src/components/lyrics-section.tsx
• webapp/src/components/mix-shelves.tsx
• webapp/src/lib/mixes.test.ts
• webapp/src/lib/mixes.ts
• webapp/src/main.tsx
• webapp/src/pages/albums-page.tsx
• webapp/src/pages/mix-page.tsx
• webapp/src/pages/playing-page.tsx
• webapp/src/pages/stats-page.tsx
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @webapp/src/api/queries.ts:
- Around line 378-380: Ajoutez la journée locale et le décalage UTC aux clés de
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- Around line 365-369: Dans statsQuery, ajoute l’offset UTC courant à queryKey
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• webapp/playwright.config.ts
• webapp/src/api/index.ts
• webapp/src/api/queries.ts
• webapp/src/main.tsx
• webapp/src/state/i18n.tsx
• webapp/src/styles/styles.css

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