resolve_history_audio_path drives a DESTRUCTIVE delete (os.remove), but lived
endpoint-bound in web_server with zero tests. Lifted to core/matching/history_paths
with injected effects (exists / resolve_library_path / lookup_titled_paths) so the
fallback chain — and the collision-safety that stops delete() from removing the
wrong same-title file — is a clean importable seam. web_server now wraps it (DB
lookup + os.path.exists + prefix resolver injected); behavior preserved.
9 tests lock it: recorded-path hit, prefix-resolve fallback, single tracks-table
candidate, and the safety rules — multiple same-title candidates with NO artist ->
None (refuse to guess), artist filter picks only the matching path, artist named
but unmatched -> None, no-title/empty-lookup -> None. Full suite green (5906).
The candidate matcher rejected valid downloads of titles with a '/' or ':' (e.g.
Sawano's "You See Big Girl / T:T") because the unified normalize() removed those
chars ("t:t" -> "tt") while keeping the '_' that source filenames substitute for
them ("T_T" -> "t_t") — the asymmetry tanked the similarity score. Now '/ \ : _'
all map to spaces before the strip, so "/ T:T" and "_ T_T" both normalize to "t t".
Verified on the real library: similarity for the Sawano pair 0.927 -> 1.000; only
348/40786 strings (0.85%, all containing those separators) change; worst-case
joined-variant match (e.g. "12:05" vs "1205") stays 0.889, well above the 0.70
title threshold — no match regressions. Fixes the matching half of #851.
Also: evaluate() treats an empty expected artist as title-only comparison
(old scanner behaviour — a missing DB artist is no evidence of a wrong file),
and the thresholds are now defined once in the core and re-exported.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
verify_audio_file now calls audio_verification.evaluate() and re-exports
normalize/similarity/_alias_aware_artist_sim from the core, so import and the
library scan can no longer drift apart. Alias-rescue diagnostic moved to the core.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Three related fixes to Tidal track matching and downloading:
1. version-field handling — Tidal stores remix/live/edit qualifiers in a
dedicated `track.version` attribute (e.g. name="Emerge",
version="Junkie XL Remix"), not in the track name. The qualifier
filter and the matcher only looked at name/album, so the exact
recording was discarded. Fold `version` into both the qualifier
haystack and the candidate title passed to MusicMatchingEngine.
2. divergent-version penalty — once versions are visible, OTHER cuts of
the same base become candidates ("(Shazam Remix)" vs "(southstar
Remix)"). Neither title is a prefix of the other, so the prefix-based
version check missed them and the raw ratio stayed high off the
shared base. Apply a heavy penalty when both titles carry different
version descriptors so the wrong cut can't outscore the threshold.
3. rate-limit backoff — the trackManifests endpoint is aggressively
rate-limited; a bare request failed 429 instantly, burned the quality
tier, re-queued the track and hammered again (a self-amplifying
storm). Honour Retry-After / exponential backoff with a bounded retry
count and shutdown-aware sleep.
Adds unit + end-to-end tests for all three.
Sokhi (continued from #806): volume-numbered series ('B小町 …キャラクター
ソングCD Vol.2' / 'Vol.2.5' / 'Vol.4' / 'Vol.4.5') got each other's art from
both normal downloads and the retag tool. Two distinct holes, one principle:
1. The art picker's _album_matches validates by significant-token SUBSET —
built to tolerate '(Deluxe)'/'- Remastered' suffixes. CJK strips out of
the normalizer entirely, so Vol.4 → {b,tv,cd,vol,4}, a clean subset of
Vol.4.5's {b,tv,cd,vol,4,5}: the wrong volume validated as "the same
album with a suffix". Affected every fuzzy art source (iTunes, Deezer,
AudioDB, Spotify) in downloads, retag, and the missing-art repair.
2. MusicBrainz match_release scores by string similarity — Vol.4 vs Vol.4.5
is 0.973, so the wrong volume could win the match outright, and its MBID
then feeds Cover Art Archive with NO downstream validation (CAA is
MBID-keyed, trusted by design). With Sokhi's MB metadata source this is
the likely path in his logs (his release-group 404s push re-matching).
The shared rule (core.text.title_match.numeric_tokens_differ): digit-bearing
tokens must be IDENTICAL between the two titles. A number on one side only —
volume, part, sequel, remaster year — is a different release, never a
suffix. '1989' vs '1989 (Deluxe)' still matches (digits shared); 'Album' vs
'Album 2' now rejects (sequels!). Art picker rejects outright (falls through
to next source / the download's own art — the designed cost of a false
reject); MB matcher halves the candidate's confidence, landing it below the
70 gate while the exact-volume result is untouched.
Tests: helper truth table, the exact reported pairs through _album_matches,
and match_release end-to-end (wrong volume alone → no match beats a wrong
MBID; exact volume beats near-identical wrong one despite lower MB score).
828 matching/metadata + 301 musicbrainz/retag/artwork tests pass.
The cross-script alias bridge (#442/#586) silently returned [] for some
artists ("Sawano Hiroyuki"). Root cause: the mb-only escape — built exactly
for the case where local string similarity is ~0 (romaji↔kanji) but MB's own
score is decisive — inspected scored[0], the COMBINED-score leader. When an
unrelated same-script decoy outranks the real artist on combined score (decoy:
sim 0.82 + mb_score 83 → combined 0.82, just under the 0.85 bar; real '澤野弘之':
sim 0 + mb_score 100 → combined 0.30, sorted last), the gate saw the decoy's
mb_score 83 (< 95), failed both paths, and cached an empty alias result.
Verification then scored the kanji artist 0% against the romaji expected name
and quarantined every correct file.
Evaluate the MB-SCORE leader independently of combined ranking for the mb-only
escape, and pull aliases from whichever entity actually passed (combined leader
for the combined path, MB-score leader for the mb-only path). The unambiguity
check now compares the top two raw MB scores. Same-script and single-result
paths are unchanged (regression-guarded by the existing #442/#586 tests).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
AcoustID returns a recording's title/artist in their ORIGINAL script
(e.g. "久石譲" for Joe Hisaishi) while SoulSync's expected metadata is
romanized/English. A correct download then fails verification on two
walls: the title can never clear the 0.70 similarity bar cross-script,
and the only skip path that ignores the title required a near-perfect
0.95 fingerprint plus a resolved alias. Result: every non-English
artist trips it. Two complementary fixes, per the reporter's two ideas.
Graceful fix (automatic):
- New pure core/matching/script_compat.py detects when two strings are
in genuinely different writing systems (CJK/Hangul/Cyrillic/Greek/
Arabic/Hebrew/Thai vs Latin). Accented Latin (Beyoncé, Sigur Rós)
stays Latin — no false trigger.
- acoustid_verification.py: when the EXPECTED artist and the matched
artist span scripts AND the artist is confirmed via the existing
MusicBrainz alias bridge, SKIP instead of quarantine, without the
0.95 floor (the 0.80 trust floor already gates the fingerprint).
- Deliberately narrow: keyed on the ARTIST spanning scripts + being
confirmed. A same-script artist with only a cross-script title keeps
the stricter 0.95 floor, so the #607 wrong-file protection (Kendrick
R.O.T.C, low-fingerprint Japanese-title) is untouched.
Per-request toggle (manual escape hatch):
- New "Skip AcoustID verification" checkbox in the download-missing
modal beside "Force Download All".
- skip_acoustid threads request -> batch -> per-track track_info ->
download context (same path as _playlist_folder_mode), landing on
the existing _skip_quarantine_check='acoustid' bypass. No new
mechanism; only the AcoustID gate is bypassed (integrity/bit-depth
still run).
Tests:
- tests/matching/test_script_compat.py — script-boundary cases.
- test_acoustid_skip_logic.py — Joe Hisaishi SKIPs at 0.85; unconfirmed
cross-script artist still FAILs; same-script low-fingerprint still
FAILs.
- test_downloads_candidates.py — toggle injects the bypass; absent
toggle keeps verification.
Full suite: 5169 passed; only pre-existing soundcloud /app env failures
remain. Zero regressions.
The #799 uniqueness-guard added a source_id_conflict(self.db, ...) call to the
MusicBrainz worker's artist path. Two TestWorkerAliasEnrichment fixtures build
the worker via __new__ and set only .database, not .db, so the new call raised
AttributeError and the artist was marked 'error'. Mirror the third fixture
(which already sets worker.db). Production always sets self.db in __init__ —
test-only gap exposed by the new code path.
An invalid API key (and rate limits / missing chromaprint / fingerprint
failures) all collapsed into the same None as a genuine no-match, so:
- every download showed a benign 'AcoustID: Skipped', and
- the 'Test API key' button reported a dead key as VALID
because test_api_key trusted 'no exception = valid' but fingerprint_and_lookup
swallows the error and returns None. A broken AcoustID setup looked completely
normal — which cost a real debugging session to untangle.
- New AcoustIDClient.lookup_with_status() returns a structured result that
distinguishes ok / no_match / error / no_backend / fingerprint_error /
unavailable. fingerprint_and_lookup() stays dict-or-None (library scanner /
auto-import / their tests unchanged) as a thin wrapper over it.
- verify_audio_file() uses it: a real error -> new VerificationResult.ERROR
(-> _acoustid_result='error' -> the existing red 'Error' history badge),
a genuine no-match -> SKIP 'No match in AcoustID database'. ERROR never
quarantines (an outage/bad key must not punish good files).
- test_api_key() now validates via the authoritative direct API call (error
code 4 = invalid key) instead of the swallowed-exception path.
Tests: structured-status distinction, legacy-wrapper contract, verify ERROR vs
SKIP, and test_api_key invalid-vs-accepted. Existing verify tests updated to
stub lookup_with_status (a stub returning just recordings is inferred as ok).
Issue #607 (AfonsoG6) -- two AcoustID problems:
1. Live recordings false-quarantining as "Version mismatch: expected
'... (Live at Venue)' (live) but file is '...' (original)" because
MusicBrainz often stores the recording entity with a bare title --
the venue / live annotation lives on the release entity, not the
recording. The audio fingerprint correctly identifies the live
recording, but the title-text comparison flagged it as wrong.
New pure helper `core/matching/version_mismatch.py:is_acceptable_version_mismatch`
accepts the mismatch only when:
- One-sided AND involves 'live': exactly one side is 'live' and
the other is bare 'original'. Two-sided mismatches stay strict.
- Fingerprint score >= 0.85 (stricter than the existing 0.80
minimum -- escape valve only fires when AcoustID is more
confident than its own threshold).
- Bare title similarity >= 0.70.
- Artist similarity >= 0.60.
Other version markers (instrumental, remix, acoustic, demo, etc)
stay strict -- those have distinct fingerprints AND MB always
annotates them in the recording title. The existing
test_acoustid_version_mismatch.py suite passes unchanged.
2. Audio-mismatch failure message reported "identified as '' by ''
(artist=100%)" when AcoustID returned multiple recordings -- prior
code mixed `recordings[0]`'s strings (which can be empty) with
`best_rec`'s scores. Now uses `matched_title` / `matched_artist`
consistently in both the high-confidence-skip path and the final
fail message.
Issue #608 (AfonsoG6) -- quarantine modal:
3. Approve / Delete buttons silently no-op'd when the filename
contained an apostrophe -- the unescaped quote broke the inline JS
in the onclick handler. Now wraps the id via
`escapeHtml(JSON.stringify(id))`, which round-trips quotes /
backslashes / unicode / newlines safely through the HTML attribute
to JS string boundary.
4. Bonus UX: quarantine entry expanded view now shows source uploader
(username) and original soulseek filename when the sidecar carries
that context -- helps trace which uploader the bad file came from.
Backend exposes `source_username` + `source_filename` fields from
`sidecar.context.original_search_result`. Degrades to '' on legacy
thin sidecars.
Tests:
- 23 new boundary tests in tests/matching/test_version_mismatch.py
pin every shape: equal versions trivial, one-sided live both
directions, threshold floors (each just below default -> reject),
two-sided strict, non-live one-sided strict (covers exact
test_instrumental_returned_for_vocal_request_fails scenario),
custom-threshold overrides.
- 4 existing test_acoustid_version_mismatch.py tests pass unchanged.
- 507 AcoustID / matching / imports tests pass.
Closes#587. Three coordinated fixes per codex's diagnosis. AcoustID
verification gate left intact — these fixes target the upstream
scanner false-positive surface plus a separate retag-path gap.
Bug 1 — scanner used recordings[0] as authoritative
`core/repair_jobs/acoustid_scanner.py:_scan_file` only checked the
top fingerprint match's metadata. AcoustID often returns multiple
recordings per fingerprint (sample collisions, multi-MB-record
cases) and the wrong-credited recording can outrank the right-
credited one. Foxxify case 2 (Nana / Nana): top match credited the
wrong artist while a lower-ranked candidate matched the user's
expected metadata exactly.
Lifted the verifier's all-candidates check to a shared pure helper
`core/matching/acoustid_candidates.py:find_matching_recording`. Both
verifier and scanner can now ask "given these candidates, does ANY
of them match expected (title, artist)?" with the same contract.
Scanner suppresses the finding when any candidate matches.
Bug 2 — no duration check guards against fingerprint hash collisions
Foxxify case 3: 17-minute mashup edit fingerprinted to a 5-minute
late-70s Japanese hiphop track (different songs, fingerprint hash
collision on a sampled section). Scanner had no signal to detect
this and would have recommended retagging the 17-min file as the
5-min track.
`duration_mismatches_strongly` in the same helper module flags drifts
beyond max(60s, 35%). Scanner now skips findings when the candidate's
duration disagrees strongly with the file's expected duration. Loaded
duration via the existing tracks SQL (added `t.duration` to the
SELECT). Returns False when either side is unknown — no behavior
change for older rows without duration data.
Bug 3 — scanner retag bypassed multi-value ARTISTS tag setting
`core/repair_worker.py:_fix_wrong_song` called `write_tags_to_file`
with single-string artist updates. The writer only wrote TPE1
(single string) and never read the user's
`metadata_enhancement.tags.write_multi_artist` config. Multi-value
ARTISTS tags got stripped on every retag, contradicting the
post-download enrichment pipeline's behavior.
Per codex's pick (option B over routing through enhance_file_metadata),
extended `write_tags_to_file` with an optional `artists_list`
parameter. Each format-specific writer respects the config flag the
same way enrichment.py does:
- ID3: TPE1 stays as joined display string + TXXX:Artists multi-value
- Vorbis/Opus/FLAC: `artist` display string + `artists` multi-value key
- MP4: \xa9ART as list when on, single string when off
Scanner retag derives the per-artist list by splitting AcoustID's
credit through the existing `split_artist_credit` helper (same
separators the matching layer already uses).
Backward compatible: callers that don't pass `artists_list` get the
exact same single-string write as before. No regression for the
write_artist_image button or any other tag_writer caller.
15 tests on the candidate helper + duration guard.
13 tests on the tag_writer multi-value path (write/skip/single/
no-list cases for FLAC + the config-gate helper).
4 new scanner regression tests pinning lower-ranked candidate
suppression, no-suppression when no candidate matches, duration
mismatch skip, no-skip when duration matches.
Existing scanner tests updated for the new 11-column SQL select
(added duration column to fake schema + test row tuples).
Full suite: 3097 passed. Ruff clean.
Closes#586. Follow-up to #442 — Cyrillic / kanji canonical names
weren't bridging cross-script comparisons. Reporter case: "Dmitry
Yablonsky" tracks quarantined as audio mismatch with file identified
as "Русская филармония, Дмитрий Яблонский" (4% artist sim) even
though the Cyrillic spelling is just the Russian transliteration.
Codex diagnosed three layered bugs in the alias resolution chain.
This fixes all three.
Bug 1 — fetch_artist_aliases ignores canonical name + sort-name
`core/musicbrainz_service.py:fetch_artist_aliases` only read
`data['aliases']`. For artists where MB's canonical `name` IS the
cross-script form (and the Latin spelling lives only in aliases —
or vice versa), the missing direction never made it into the
returned list. Fix: include both `data['name']` and `data['sort-name']`
alongside the explicit alias entries (deduped, also pulls each
alias entry's sort-name when present).
Bug 2 — lookup_artist_aliases ran search in strict mode only
Strict mode queries `artist:"..."` only and skips MB's alias and
sortname indexes. Cross-script searches found nothing under strict
because the user's Latin input never matches a Cyrillic canonical
name in the artist index. Fix: lifted the search-and-score logic
to a private helper `_search_and_score_artists(name, strict=)` and
fall back to non-strict when strict returns empty OR all results
fail the trust gate. Non-strict (bare query) hits all indexes.
Bug 3 — trust gate weighted local similarity 70%
Combined score = local_sim * 0.7 + mb_score/100 * 0.3. Cross-script
pairs have local sim ~0 → combined ~0.30 → below the 0.85 threshold
→ cached as empty even when MB's own confidence was 100. Fix: added
an MB-only escape — when MB score is >= 95 AND the result is
unambiguous (top result's MB score leads the runner-up by >= 5),
accept regardless of local similarity. The existing combined-score
path stays intact for same-script matches (#442 Hiroyuki Sawano
case still passes via that path).
12 new tests pin every layer:
- fetch_artist_aliases canonical-name inclusion + dedup against
alias entries + missing-canonical handling + exception path
- strict-then-non-strict fallback (empty-strict + low-strict-score)
- trust gate MB-only escape + low-confidence rejection + ambiguity
rejection (two artists same MB score) + same-script regression
- end-to-end reporter scenario with the real `artist_names_match`
helper proving the bridge works for "Русская филармония, Дмитрий
Яблонский" vs expected "Dmitry Yablonsky"
Existing alias tests in `test_artist_alias_service.py` updated to
reflect: canonical name now appears in `fetch_artist_aliases`
output, lookup makes 2 search calls (strict + non-strict fallback)
on first cache miss instead of 1.
Full suite: 3065 passed.
Closes#589. Tracks from MTV Unplugged / Live At / unplugged albums
consistently failed AcoustID verification with "Version mismatch:
expected (live) but file is (original)". Two upstream bugs fed into
the false positive — the AcoustID gate itself was correctly catching
the wrong file Tidal had selected. Codex diagnosed all three layers,
this fixes the two upstream causes and leaves the verifier alone.
Bug 1 — album-scoped library check false-misses owned albums
`core/downloads/master.py:184` scored "Shy Away (MTV Unplugged Live)"
(source title from playlist) vs "Shy Away" (local DB stored title)
with raw string similarity. Massive length asymmetry → ~0.3 → below
the 0.7 threshold → marked missing. Combined with the
`allow_duplicates and batch_is_album` short-circuit that disables
the global fallback for album downloads, the user's already-owned
album re-triggered every track for download. Explains the screenshot
showing "0 found / 7 missing" on an album the user manually placed.
New pure helper `core/matching/album_context_title.py:strip_redundant_album_suffix`
strips trailing parenthetical / bracket / dash suffixes whose tokens
are fully subsumed by the album context — at least one version
marker (live / unplugged / acoustic / session / concert / tour)
overlapping with the album, and every other token is either a
known marker, a year, a tolerated noise word, or a word from the
album title. Album-context-implied "live" added when the album
mentions unplugged / concert / tour / session.
Wired into the album-confirmed scope ONLY (not global matching).
Compares both raw and normalized source titles per album track and
takes the max similarity, so the helper returning the input
unchanged (when album doesn't imply version context) preserves
the pre-fix behavior.
Bug 2 — Tidal qualifier filter only ran on fallback searches
`core/tidal_download_client.py:345` set `is_fallback = attempt_idx > 0`
and only filtered when `is_fallback and required_qualifiers`. Primary
search returned all results unfiltered, so a query for "Shy Away
(MTV Unplugged Live)" could accept the studio cut if Tidal happened
to rank it first. Now the qualifier filter applies to BOTH primary
and fallback search attempts — log message updated to indicate
which path triggered.
Bug 3 — qualifier check ignored album.name
The legacy `_track_name_contains_qualifiers` only inspected the
track name. For concert / unplugged releases the live signal
typically lives in the album title, not the track title. New
`_track_matches_qualifiers` accepts a track object and inspects
both `track.name` AND `track.album.name`. Legacy helper preserved
to keep its existing test contract.
AcoustID version-mismatch gate at core/acoustid_verification.py
left intact — it correctly catches genuinely-wrong files that slip
through upstream filters. The In My Feelings (Instrumental) test
that pins this behavior continues to pass.
19 tests on the album-context helper covering MTV Unplugged
variants, dash/parens/brackets suffix shapes, year tolerance,
plural-form markers, the implied-live set, anti-regression cases
(instrumental/remix on a studio album must NOT be stripped),
empty/none defensive paths.
13 tests on the Tidal qualifier helper covering legacy
track-name-only behavior preserved, qualifier in track name alone,
qualifier in album name alone (the MTV Unplugged scenario),
multi-qualifier requirements, no-qualifiers always passes,
defensive against missing track.album, word-boundary avoiding
substring false-matches, _extract_qualifiers picking up live +
unplugged from the user's exact reporter query.
Full suite: 3053 passed.
Discord report (Foxxify): the AcoustID scanner repair job flagged
multi-artist tracks as Wrong Song because AcoustID returns the
FULL credit ("Okayracer, aldrch & poptropicaslutz!") while the
library DB carries only the primary artist ("Okayracer"). Raw
SequenceMatcher similarity scored ~43% — well below the 60%
threshold — so the scanner created a finding even though the
audio was correct. User couldn't fix without lowering the global
artist threshold to ~30% (which would let real mismatches through).
# Fix
Extended the shared `core/matching/artist_aliases.py::artist_names_match`
helper (originally lifted for #441) with credit-token splitting.
When the actual artist string contains common separators —
- punctuation: `,` `&` `;` `/` `+`
- keywords (whitespace-bounded): `feat.` `ft.` `featuring` `with`
`vs.` `x`
— the helper splits into individual contributors and checks each
against the expected artist. Primary-in-credit cases now resolve
at 100% instead of 43%.
Two pattern groups because punctuation separators don't need
surrounding whitespace, but keyword separators MUST be
whitespace-bounded — otherwise we'd split artists with `x` /
`with` etc. in their names ("JAY-X" → "JAY-" / "" issue).
Composes with the existing alias path: cross-script multi-artist
credits ("Hiroyuki Sawano" expected, "澤野弘之, FeaturedJp"
actual) work via alias-token-against-credit-token compare.
# Wire-in
Scanner at `core/repair_jobs/acoustid_scanner.py:202` replaces
the raw `SequenceMatcher` call with `artist_names_match`. Pass
RAW artist strings (not pre-normalised by `_normalize`) so the
splitter can recognise separators — `_normalize` strips ALL
punctuation, which destroyed the very tokens the splitter needs.
The AcoustID post-download verifier (`core/acoustid_verification.py`)
already routes through `_alias_aware_artist_sim` which calls the
same helper — gets the multi-value benefit automatically without
a separate wire-in.
# New `split_artist_credit` exported helper
Pure-function helper for callers who want token-level access to
the credit list (debugging, UI, future per-token enrichment). Same
splitter logic, exposed as a top-level function.
# Tests added (14)
`tests/matching/test_artist_aliases.py` (+11):
- `TestSplitArtistCredit` — parametrised across 12 credit-string
formats (comma, ampersand, semicolon, slash, plus, feat./ft./
featuring, with, vs., x, single-token, empty), drops empty
tokens, strips per-token whitespace
- `TestMultiValueCreditMatching` — reporter's exact case
(Okayracer in 3-artist credit → 100%), primary in middle/end of
credit, genuine-mismatch still fails, single-token actual falls
through to direct compare, multi-value composes with aliases,
threshold still respected
`tests/test_acoustid_scanner.py` (+3):
- Reporter's case end-to-end through `_scan_file` — fingerprint
99% / title 100% / multi-artist credit → no finding created
- Genuine artist mismatch still creates finding (no false
suppression of real mismatches)
- `JobResultStub` minimal scaffold for the integration tests
# Verification
- 14 new tests pass (49 helper + 5 scanner total in their files)
- 110 matching + scanner tests pass total
- 2584 full suite passes (+25 from baseline 2559)
- Ruff clean
- Reporter's exact case (Okayracer in `Okayracer, aldrch &
poptropicaslutz!`) now scores 100% match → no Wrong Song flag
Cin pre-review pass on the false-positive risk. Three tightenings:
# 1. Bumped MB-search trust threshold from 0.6 → 0.85
`MusicBrainzService.lookup_artist_aliases` previously trusted any
MB search match scoring ≥ 0.6 combined (name-similarity + MB
relevance). For distinctive cross-script artists the user-reported
case targets (Hiroyuki Sawano, Сергей Лазарев, etc.) real matches
score ~1.0 — well above 0.85. The 0.6 floor was loose enough to
let in moderate matches for ambiguous names, risking aliases for
the wrong artist getting cached + applied.
Bumped to 0.85. Tighter without rejecting any of the legit
cross-script cases the PR is for.
# 2. Ambiguity gate — skip when results within 0.1 of best
When MB search returns multiple results all scoring high (within
0.1 of the best), the artist name is ambiguous — common name with
multiple distinct artists ("John Smith" returning 10 different
John Smiths). Pulling aliases for any one of them risks the wrong
artist's data bridging incorrectly to a file's tag.
Added explicit ambiguity detection: when 2+ results within 0.1,
skip alias lookup entirely + cache empty. Matches Cin's
"explicit > implicit" — the prior code just picked the highest
score blindly.
# 3. Diagnostic log when alias rescues a comparison
When the alias path triggers a PASS that direct similarity would
have FAILed, emit an INFO log: `Artist alias rescued comparison:
expected='X' vs actual='Y' (direct sim=0.00, alias 'Z' →
score=1.00)`.
Lets future bug reports trace which alias triggered which decision.
Doesn't change behavior — visibility only. Logs ONLY the rescue
case, not happy-path direct matches (no log spam).
# Tests added (5)
`test_artist_alias_service.py` (+3):
- `test_moderate_confidence_match_now_skipped_strict_threshold`
- `test_ambiguous_results_skipped`
- `test_unambiguous_high_confidence_match_succeeds`
`test_acoustid_verification_aliases.py` (+3):
- `test_alias_rescue_emits_info_log` — direct-fail + alias-pass
emits INFO log
- `test_no_log_when_direct_match_succeeds` — happy path quiet
- `test_no_log_when_alias_doesnt_help` — failed path also quiet
# Test infrastructure note
Logging tests use a directly-attached `ListHandler` on
`soulsync.acoustid.verification` (the actual logger name —
dot-separated by `get_logger`), NOT pytest's caplog. Same pattern
as the prior watchdog-test fix — caplog is intermittently flaky
in full-suite runs for soulsync namespace loggers. An owned
handler sidesteps both issues.
# Verification
- 85/85 matching tests pass (+5 from prior commit)
- 2543 full suite passes (+6 from prior, +85 PR-total)
- Ruff clean
- Reporter's Japanese + Russian regression tests still pass —
legit cross-script case (sim ≈ 1.0) clears the new 0.85
threshold easily
Two perf gaps that would have failed Cin's review:
# Gap #1: alias lookup fired unconditionally
Pre-fix in this commit, `_resolve_expected_artist_aliases` ran at
the top of every `verify_audio_file` call regardless of whether
the direct artist match would have passed. For users whose library
is mostly same-script (95% of cases), every successful verification
was paying for a wasted DB query (and possibly a wasted MB API
call for un-enriched artists).
Restructured the helper to accept a callable provider instead of a
pre-resolved list. Provider invoked LAZILY only when direct
similarity falls below `ARTIST_MATCH_THRESHOLD`. Verifier passes a
memoising thunk that resolves once across the 3 comparison sites
within one verification.
`_alias_aware_artist_sim` now accepts `aliases` as either:
- iterable of strings (used eagerly — backward compat with tests
that already know the aliases)
- callable returning the iterable (resolved on first need within
a verification)
Happy path (direct match passes): zero DB queries, zero MB calls.
Cross-script case: one resolution shared across 3 sites — same as
the prior contract.
# Gap #2: existing-MBID artists never got alias backfill
Worker's `_process_item` artist branch had an `existing_id` short-
circuit (line 296) that updated MBID status but skipped alias
fetch. Result: every user with an already-enriched library had
MBIDs but NULL aliases on day-one of this PR. Live MB lookup at
verify-time covered them, but at the cost of N live calls for N
artists across the library.
Added one-time backfill: when existing-MBID is found AND
`artists.aliases` for that row is empty, fetch + persist aliases.
Subsequent re-scan cycles short-circuit on the populated column —
no repeated MB calls.
New helper `_artist_aliases_empty(artist_id)` does the cheap NULL
check via direct SQL. Best-effort: defensively returns True on
errors so backfill happens (a redundant MB call is cheaper than
missing the backfill entirely).
# Tests added (9)
`test_acoustid_verification_aliases.py` (+6):
- `TestLazyAliasResolution` (3): no lookup when direct match passes,
lookup fires only when direct fails, lookup memoised across the
3 sites within one verification.
- `TestAliasProviderCallable` (3): iterable passed directly,
callable resolves lazily, callable returning empty falls back to
direct sim.
`test_artist_alias_service.py` (+3):
- `test_existing_mbid_path_backfills_aliases_when_column_empty`
- `test_existing_mbid_path_skips_backfill_when_aliases_already_set`
- `test_existing_mbid_backfill_failure_does_not_break_match`
# Verification
- 79/79 matching tests pass (+9 from prior commit)
- 2537 full suite passes (+9, +79 PR-total)
- Ruff clean
- Backward compat: every prior-commit test still passes (the
iterable-shape API still works alongside the new callable shape)
This is the user-visible commit. The reporter's exact two cases
(Japanese kanji, Russian Cyrillic) now pass verification instead of
being quarantined.
# What changed
Verifier's three artist-similarity sites now route through the
shared `core.matching.artist_aliases.artist_names_match` helper
instead of raw `_similarity`:
- `_find_best_title_artist_match` (per-recording scoring at the
best-match stage)
- Secondary scan when title matches but best-match's artist doesn't
(line ~355 pre-fix)
- Final fallback scan over all recordings (line ~403 pre-fix)
Aliases for the expected artist are resolved ONCE at the top of
`verify_audio_file` via `_resolve_expected_artist_aliases`, which
calls the new `MusicBrainzService.lookup_artist_aliases` chain
(library DB → cache → live MB). Single resolution per verification
regardless of how many AcoustID recordings come back — pinned by
test.
New helper `_alias_aware_artist_sim(expected, actual, aliases)`
wraps the pure helper with the verifier's normaliser
(`_similarity`) and threshold (`ARTIST_MATCH_THRESHOLD`). Returns a
single float so existing threshold-comparison code paths keep their
shape — minimal diff.
# Reporter's cases — verified
Case 1 (issue #442 verbatim):
File: YAMANAIAME by 澤野弘之
Expected: YAMANAIAME by Hiroyuki Sawano
Pre-fix: Quarantined (artist=0%)
Post-fix: PASS (alias '澤野弘之' resolved from MB)
Case 2 (issue #442 verbatim):
File: On the Other Side by Sergey Lazarev
Expected: On the other side by Сергей Лазарев
Pre-fix: Quarantined (artist=7%)
Post-fix: PASS (alias 'Sergey Lazarev' resolved from MB)
Both reproduced as regression tests with stubbed MB service.
# Backward compat
Three test cases pin that no-aliases / failure paths preserve
pre-fix behaviour exactly:
- Clear artist mismatch (different artist, same script) still
FAILs — aliases bridge synonyms, not unrelated artists.
- Exact title + artist match still PASSes regardless of aliases.
- MB service raise → verifier completes with direct similarity
(treats failure as "no aliases available" — same as pre-fix).
Also covers manual import: the import-modal "Search for Match"
flow goes through the same verifier, so the reporter's complaint
that "manual import simply throws them back in quarantine again"
is fixed by the same change.
# Tests added (11)
`tests/matching/test_acoustid_verification_aliases.py`:
- `_alias_aware_artist_sim`: alias bridges score ↑, no-aliases
falls back, aliases don't mask genuine mismatches
- `_find_best_title_artist_match` accepts + uses aliases
- Reporter's case 1 (Japanese) end-to-end
- Reporter's case 2 (Russian) end-to-end
- Backward compat: no-aliases mismatch still fails, exact match
still passes, MB-service-raise doesn't break verification
- Performance: alias lookup fires ONCE per verification regardless
of recording count
# Verification
- 11 new verifier tests pass
- 31 prior service tests pass
- 28 prior helper tests pass
- 294 matching + imports tests pass total (no regression)
- Ruff clean
Previous commit only populated `artists.aliases` for artists the MB
worker had enriched. But the AcoustID verifier (next commit) needs
aliases for ANY expected artist — including:
- Artists not yet in the user's library (first download)
- Artists in the library where MB enrichment hasn't run yet
- Artists where MB enrichment ran but found no MBID (NULL aliases)
This commit adds a multi-tier resolution helper that fills those
gaps without thrashing the MB API.
# Multi-tier resolution
`lookup_artist_aliases(artist_name) -> list[str]`:
1. **Library DB** (fast path): existing `get_artist_aliases` lookup
by name. No network. Most common path once the worker has
enriched everything.
2. **Cache** (existing `musicbrainz_cache` table, entity_type=
`artist_aliases`): a prior live lookup for this name. Empty
cache hit is respected (don't re-query when MB previously had
nothing).
3. **Live MB**: search artist by name → pick highest-confidence
match (combined name-similarity + MB relevance) → fetch aliases
for that MBID → cache the result.
Always returns a list (possibly empty), never raises. Empty result
on any tier means "no alternate spellings found, fall back to
direct match" — identical to the pre-fix behaviour.
# Threshold gate
Live lookup only trusts the MB search result when combined
similarity score >= 0.6. Below that, we'd be guessing at the wrong
artist — searching `John Smith` returns multiple John Smiths and
pulling aliases for one of them could mismatch. Cache the empty
result so we don't keep re-searching the same low-confidence name.
# Performance contract
Critical for the verifier path: 100 quarantine candidates with the
same expected artist must NOT trigger 100 MB API calls. Cache hit
on second + subsequent calls per unique artist name. Verified by
test pinning the call counts.
# Tests added (8)
- Tier 1 library DB hit — no MB API call fired
- Tier 3 live MB lookup → search → fetch → returns aliases
- Tier 2 cache hit on second call — no re-query
- Empty input → empty return + no API call
- Network failure on search → empty + cached so we don't retry
- No search results → empty + cached
- Low-confidence match (sim < 0.6) skipped — defends against
picking the wrong artist
- Library row exists but aliases NULL → falls through to live
lookup (defends against the half-enriched state)
# Verification
- 31/31 service tests pass (8 new + 23 prior)
- Ruff clean
Issue #442 — MusicBrainz exposes alternate-spelling aliases (Japanese
kanji `澤野弘之` for `Hiroyuki Sawano`, Cyrillic `Сергей Лазарев` for
`Sergey Lazarev`, etc.) on every artist record. SoulSync's MB
enrichment worker had access to this data via `get_artist(mbid,
includes=['aliases'])` but wasn't reading or persisting it.
This commit wires the alias fetch into the worker's existing
artist-match path, persists to the new `artists.aliases` column
added in the prior commit, and adds a verifier-friendly read-by-
name lookup so the AcoustID verifier (next commit) can resolve
aliases without an MB round-trip when the artist is in the library.
# New service methods
- `fetch_artist_aliases(mbid) -> list[str]` — calls
`mb_client.get_artist(mbid, includes=['aliases'])`, parses the
alias array, dedupes case-insensitively. Returns empty list on
any failure (missing key, network error, malformed response) so
transient MB outages never trigger stricter quarantine decisions
than the pre-fix behaviour. Empty mbid → no API call.
- `update_artist_aliases(artist_id, aliases)` — persists as JSON
array to `artists.aliases`. Idempotent — overwrites prior value.
Empty list clears the column. None artist_id is a no-op.
- `get_artist_aliases(artist_name) -> list[str]` — reads back by
artist NAME (not id), case-insensitive. Used by the verifier
where the expected artist comes from track metadata — there's no
library row id at quarantine time. Returns empty list for unknown
artists, missing data, or corrupt JSON (defensive against legacy
rows).
# Worker integration
`MusicBrainzWorker._process_item` artist branch:
- After `update_artist_mbid` succeeds, fetch aliases for the matched
MBID and persist via `update_artist_aliases`.
- Best-effort: alias fetch wrapped in try/except, failure logs at
debug level, doesn't regress the match outcome.
- No alias call when the artist didn't match an MBID (nothing to
enrich).
# Tests (23)
- `fetch_artist_aliases`: extracts names from MB response,
case-insensitive dedup, skips empty/null entries, missing-key
fallback, network failure → empty, empty mbid no API call,
verifies `inc=aliases` request param.
- `update_artist_aliases`: persists as JSON, idempotent overwrite,
empty list clears column, None id is no-op.
- `get_artist_aliases`: returns aliases for known artist,
case-insensitive lookup, empty for unknown artist / no-aliases
row, handles corrupt JSON + non-list shape gracefully.
- Worker integration: matched artist triggers fetch + persist,
no alias call when not matched, alias-fetch failure doesn't
break the match outcome.
# Verification
- 23/23 new tests pass
- Ruff clean
Issue #442 — files tagged with one spelling of an artist's name
(Japanese kanji `澤野弘之`) get quarantined when SoulSync expects the
romanized spelling (`Hiroyuki Sawano`). Raw similarity comparison
scored 0% across scripts. MusicBrainz exposes alternate-spelling
aliases on every artist record but the verifier never consulted
them.
This commit adds the pure helper that does the alias-aware
comparison. No I/O, no DB access, no network. Caller supplies the
aliases (looked up from library DB or live MB by later commits in
this PR). Default threshold matches the verifier's existing
`ARTIST_MATCH_THRESHOLD` (0.6) so wiring this in preserves current
pass/fail semantics on the no-alias path.
# API
```
artist_names_match(expected, actual, *, aliases=None,
threshold=0.6, similarity=None)
-> (matched: bool, best_score: float)
```
- Direct compare first (fast path + baseline score)
- If below threshold, score each alias against `actual`
- First alias to clear threshold → match
- Returns the best score across all candidates so callers can log
the score they made the decision on
```
best_alias_match(expected, actual, aliases=None, *, similarity=None)
-> (winner: Optional[str], best_score: float)
```
Companion helper for callers that want to surface WHICH alias
triggered the match (debug logs, UI explanations). No threshold —
purely informative.
# Architectural choices
- **Pure function**: no I/O. Caller (verifier, future matching-engine
consumers) owns alias lookup strategy + threshold tuning.
- **Custom similarity callable**: lets the verifier pass its
parenthetical-stripping normaliser without this module having to
know about it. Defaults to lowercase + SequenceMatcher (matches
the verifier's existing behaviour).
- **Defensive coercion**: aliases input handles None entries, empty
strings, non-string types, sets, tuples, lists — caller may feed
raw MB response data without cleaning first.
- **Backward compat**: `aliases=None` or empty → behaves identically
to a plain similarity check. Paths not yet wired up to alias lookup
see no behaviour change.
# Tests (28)
- Direct compare (no aliases): exact / case / whitespace / fuzzy /
different
- Cross-script with aliases: Japanese ↔ romanized (reporter's case 1),
Cyrillic ↔ Latin (reporter's case 2), symmetric direction, no-match
fallthrough so aliases don't mask genuine mismatches
- Aliases input handling: None, empty, set, tuple, None-entries,
non-string entries
- Threshold: default matches verifier's 0.6, custom stricter, custom
looser
- Custom similarity: applies to both direct + alias compare
- Best-alias-match introspection
- Backward compat parametrised across 5 cases
# What this commit does NOT do
This is the helper module + tests only. Subsequent commits in this
PR populate aliases (MB worker), provide live MB lookup with cache
for un-enriched artists, and wire the helper into the AcoustID
verifier where the quarantine decision actually fires.
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