feat(canvas): collect the bytes a failure left in the store - #163
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RFC-009 decision 6 said when a blob stops being referenced and by which transaction, and left open who picks up what a crash left behind. This is that, as decision 10 — a sweeper in `spawn_upload_sweeper`'s shape: a pass at boot, then one a day. Orphans are made by failures rather than by use, so it is a repair pass, and on a server that has not crashed it finds nothing and costs a directory listing. Three kinds of file, and only one is removed without reservation. A blob no `canvas` row names any more goes — under its own hash lock, with the count re-read inside it. Without that lock this sweeper would be the cause of the damage it exists to repair: a placement writes its file, and between that write and its row the sweep sees bytes nothing names and takes them, leaving the placement to commit a row whose file is gone. A working file — `<uuid>.part`, `<uuid>.silent` — goes if it is older than an hour. Those names belong only to the call that wrote them: no row mentions them and there is no lock to take, so age stands in for both. An hour is far past anything a live placement can still be doing. **Everything else is counted and left exactly where it was.** The store lives under the operator's `data/`. A sweep that deletes what it cannot name is one nobody should run, so a file is a candidate only if it is `<64 hex>.<format>` for a whitelisted format, or one of the two working names this module writes. A row naming a file that is gone is reported and never repaired. That is the failure decision 6 calls unrecoverable, and the repair would be to delete somebody's canvas — answering a dead link by making it a missing one. Three guards were checked by removing them: drop the reference re-count and a live canvas is taken; drop the grace period and a working file a request is still holding is taken; loosen the classifier and the operator's own file is taken. **The lock is not among them, and is not claimed to be.** Removing it fails nothing: the damage needs a placement and a sweep to interleave at one instant, and no test here can force that ordering. It is reasoned, not demonstrated, and the code says so where it is written. `artwork_dir` still has the same property and no sweeper. It moves from a remark inside decision 6 to an open question of its own, because it is the same work on another store with references spread over three columns instead of one — not the same caution, and not the same day. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
📝 WalkthroughWalkthroughLe serveur lance un balayage Canvas au démarrage puis toutes les 24 heures. Le balayage supprime les blobs orphelins et les fichiers de travail expirés, conserve les noms inconnus et signale les références sans fichier. ChangesBalayage du stockage Canvas
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The added canvas test depends on an externally installed ffmpeg binary and its version, which can make CI or developer results environment-dependent. The PR remains mergeable with explicit owner awareness or follow-up to make the test hermetic. Sequence Diagram(s)sequenceDiagram
participant Serveur
participant DomainServices
participant StockageCanvas
participant BaseDeDonnees
Serveur->>DomainServices: Lancer spawn_canvas_sweeper()
DomainServices->>StockageCanvas: Exécuter sweep_canvas_store()
StockageCanvas->>BaseDeDonnees: Vérifier les références
BaseDeDonnees-->>StockageCanvas: Retourner les références et liens morts
StockageCanvas-->>DomainServices: Retourner CanvasSweep
DomainServices-->>Serveur: Journaliser le résultat
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation La description explique le contexte, le fonctionnement du balayage, les protections, les limites, les tests et les commandes de validation. Elle ne reprend pas les rubriques exactes du modèle et ne confirme pas explicitement le DCO, mais elle contient les informations principales requises. Full details: Docstring CoverageExplanation Docstring coverage is 73.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 3 files. (1 skipped: 1 unsupported.)
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Inline comments:
In `@src/services/canvas.rs`:
- Around line 1084-1085: Update the working-file classification in the extension
handling around StoreEntry::Working so .part and .silent are accepted only when
the filename prefix is a valid UUID matching the format produced by
place_canvas; otherwise continue normal classification. Add a regression case to
the existing sweep test covering an operator-named file such as
operator-notes.part.
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docs/rfcs/RFC-009-track-canvas.mdsrc/main.rssrc/services/canvas.rstests/canvas.rs
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Valid, and it is the previous commit's own rule contradicting itself. A blob had to be sixty-four lowercase hex characters before the sweep would touch it, on the stated ground that a sweep deleting what it cannot name is one nobody should run — and then any stem at all was accepted in front of `.part`. The operator's `notes.part` was the one file in the store an extension alone could carry off. The stem is a UUID because `place_canvas` writes `<uuid>.part` and the strip renames it to `<uuid>.silent`, so requiring one to parse costs nothing and closes the asymmetry exactly. The comment that justified not checking it is gone rather than reworded. It argued that the stem "identifies nothing", which is true and beside the point: what the stem establishes is not identity but ownership — whether this module wrote the file. The regression case is the same file wearing the extension: `operator-notes.part`, backdated past the grace period so that the stem is the only thing standing between it and deletion. Removing the check takes it, two removals where the test wants one. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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Inline comments:
In `@tests/canvas.rs`:
- Line 1308: Rendre le test autour de canvas_bytes et sweep_canvas_store
hermétique en supprimant sa dépendance à ffmpeg via PATH. Utiliser à la place un
fichier média de test versionné et contrôlé par le dépôt, ou injecter un
producteur de bytes déterministe, tout en conservant le scénario et
l’utilisation d’une base SQLite temporaire.
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| std::fs::write(&disguised, b"do not delete either").unwrap(); | ||
| set_age(&disguised, std::time::Duration::from_secs(2 * 60 * 60)); | ||
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| let swept = state.services.sweep_canvas_store().await.unwrap(); |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Rendez ce test hermétique avant la fusion.
Le scénario ajouté passe par canvas_bytes (Line [1278]), qui lance ffmpeg avec Command::new depuis PATH. Il dépend donc d’un binaire externe et de sa version. Utilisez un fichier média de test contrôlé par le dépôt ou un producteur de bytes injecté.
As per coding guidelines: « Tests must be hermetic and use temporary SQLite databases; they must not require PostgreSQL or Better Auth processes. »
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In `@tests/canvas.rs` at line 1308, Rendre le test autour de canvas_bytes et
sweep_canvas_store hermétique en supprimant sa dépendance à ffmpeg via PATH.
Utiliser à la place un fichier média de test versionné et contrôlé par le dépôt,
ou injecter un producteur de bytes déterministe, tout en conservant le scénario
et l’utilisation d’une base SQLite temporaire.
Source: Coding guidelines
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#!/bin/bash
set -euo pipefail
repo="InstaZDLL/waveflow-server"
body=$(cat <<'EOF'
## Résumé
Rendre hermétique le test de balayage du stockage Canvas.
Le test `the_sweep_collects_orphans_and_leaves_everything_else_alone` dans `tests/canvas.rs` appelle `canvas_bytes`. Cette fonction lance `ffmpeg` depuis `PATH`. Le test dépend donc d'un binaire externe et de sa version.
## Changements requis
- Supprimer la dépendance de ce scénario à `ffmpeg` depuis `PATH`.
- Utiliser un média de test versionné et contrôlé par le dépôt, ou injecter un producteur de bytes déterministe.
- Conserver le scénario de `sweep_canvas_store`.
- Conserver l'utilisation d'une base SQLite temporaire.
- Ne pas nécessiter PostgreSQL ni Better Auth.
## Zones concernées
- `tests/canvas.rs`
- Les fixtures Canvas associées, si nécessaire.
## Critères d'acceptation
- Le test ne lance pas `ffmpeg` ou un autre binaire externe depuis `PATH`.
- Le test continue de vérifier la suppression sélective des blobs orphelins et des fichiers de travail expirés.
- Le test continue de vérifier la conservation des blobs référencés, des fichiers de travail récents et des fichiers opérateur inconnus.
- La suite de tests reste hermétique.
## Contexte
Demandé par `@InstaZDLL`.
- PR : https://github.com/InstaZDLL/waveflow-server/pull/163
- Commentaire de revue : https://github.com/InstaZDLL/waveflow-server/pull/163#discussion_r3889647285
EOF
)
gh issue create \
--repo "$repo" \
--title "test(canvas): rendre le test du balayage hermétique" \
--body "$body" \
--assignee "InstaZDLL"Length of output: 3737
@InstaZDLL, issue créée : #164 — test(canvas): rendre le test du balayage hermétique.
🧬 Code Graph Analysis Results
tests/support/mod.rs
- Lines 110–116:
run_scandelegates toscan_oncefor populating library track fixtures. - Lines 152–154:
write_test_wavcreates the standard WAV fixture used byfixture. - Lines 276–279:
json_bodyconsumes an HTTP response body and parses it as JSON. - Lines 328–330:
login_tokenreturns the access token fromlogin_session. - Lines 336–359:
login_sessionauthenticates through the login route and returns the access token and device ID.
tests/canvas.rs
- Lines 30–42:
canvas_appcreates a temporary configured application, applies canvas-limit tuning before initialization, and returns the temporary directory, configuration, and application state. - Lines 52–116:
fixturecreates an admin account, scanned private library, test tracks, enables canvas acceptance, and obtains an authentication token. - Lines 122–146:
canvas_bytesinvokes FFmpeg to generate a video-only MP4 fixture and returns its bytes. - Lines 172–181:
stored_fileslists and sorts entries in the configured canvas store. - Lines 574–576:
authorizedadds a Bearer authorization header to an HTTP request builder. - Lines 1015–1039:
library_eventsfetches and parses a library event feed, asserting an HTTP 200 response. - Lines 1361–1365:
set_agebackdates a file’s modification time for sweep tests.
src/services/mod.rs
- Lines 451–453:
file_namederives the stored canvas filename from its content hash and format.
src/config.rs
- Lines 45–57:
CanvasLimitsdefines the maximum canvas byte size, maximum duration, and per-library quota; quotas count distinct referenced blobs.
src/database.rs
- Lines 35–47:
AccountRoledefinesAdminandUserroles and their string representations. - Lines 63–75:
LibraryVisibilitydefinesPrivateandSharedvisibility values and their string representations.
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#163 closed the question the handoff still carried as item 2. What replaces it is narrower and honest: `artwork_dir` has had the same property since the beginning and still has nobody walking it. Same work, another store, references over three columns instead of one — so not the same caution, and deliberately not the same day as code that deletes files. The standing line moves with it: `main` at `45411b4`, 107 integration tests rather than 106. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
Three pull requests landed since this file last described the work left: #165 decided the four questions RFC-007 and RFC-009 were carrying, #166 built decision 7, and #163 was already recorded. Batched rather than patched after each merge, which is the promise made after the third amendment this morning. The reason to keep amending at all is the same one this file's own traps section gives — a document that lists finished work as pending is how another agent lost three batches — but doing it per pull request turns the record into a changelog of itself. What the next agent picks up shrinks to three, and two of them are no longer questions: - Decision 8, the acknowledgement table: decided by #165 and not built, which is the distinction the `Implémentée par` line carries. - Sweeping `artwork_dir`: queued work, not an arbitration. The canvas store has a sweeper; the cover store has the same property and none. - §4, the four Subsonic clients, still the gate on `v2.0-beta` and still not something a session can do. Claude-Session: https://claude.ai/code/session_01GtAmdsaBCg8Cs2rvrdLD7Z Signed-off-by: InstaZDLL <github.105mh@8shield.net>
`artwork_dir` has grown in one direction since the beginning. `upsert_artwork` inserts `ON CONFLICT DO NOTHING`, no statement anywhere deletes from `artwork`, and nothing ever unlinks a file — so an instance keeps every cover it has ever held, and a library rescanned after its art changed keeps both. The three columns are why. `artist`, `album` and `track` each name a hash `ON DELETE SET NULL`, so deleting an album returns its column to `NULL` and tells nobody. There is no unlink path to hang a reference count on, which is what the canvas store has: `track_canvas` is a link table, and `release_canvas_blob` counts rows at the moment one is removed. Here there is no such moment. There is only asking, which is what a sweep is. ## Not `sweep_canvas_store` with another directory The handoff filed this as "same shape, another store, references on three columns instead of one". The columns are three, and the shape is not the same, because of who writes the files. The canvas store is written by this process, so a placement and a sweep take the same per-hash lock and the race between them is shut. `waveflow_core::scanner::extract_cover` writes covers from a blocking task, in a crate that has never heard of `DomainServices`. There is no lock to take, and the writer gate is not a substitute: file I/O has no business happening while the process-wide gate is held, which is the rule `upload_locks` and `canvas_locks` were both built to follow. So age stands in for the lock, exactly as it already does for the canvas *working* files and for the same stated reason. A file younger than an hour is left alone whatever the database says, which covers the window between `extract_cover` writing bytes and `apply_catalog_track` committing the row. Rows need no such grace: the insert and the column that names it are one transaction, so a committed row is already referenced. ## The window age does not shut, said plainly `extract_cover` writes only `if !out_path.exists()`, so meeting a cover already in the store refreshes no timestamp. A sweep reading "no row" for an old file and a scan committing a row for that content an instant later still cross. What makes it survivable is the thing that is not true of a canvas: the bytes are in the audio file, which is read-only and still there. With the file gone `out_path.exists()` is false and the next scan writes it back. The cost is a cover missing until then, reported as a dead link meanwhile — not bytes that exist nowhere. That is an argument for tolerating the window, not for pretending it is shut, and the module says so. ## Thumbnails, which nothing in the database has ever named `spawn_thumbnail_job` writes `<hash>_1x.jpg` and `<hash>_2x.jpg` beside every cover. No table names them. A classifier that only knew covers would call both unknown and leave them for the life of the instance — two files per cover, growing exactly as the covers do. They are found by their stem and go with what they derive from. Nothing is removed that the sweep cannot name: `<64 hex>.<format>` for a format `artwork_mime` admits, or a thumbnail of such a hash. The store is under the operator's `data/`, and everything else is counted, logged and left. ## Tests Two, and the first is the one that matters: a pass over a freshly scanned library takes nothing, with the cover aged deliberately so that the grace period is not what saves it. The second unreferences the art the way deleting an album does, and watches the row go at once and the bytes wait for the grace. Neither spells a filename. The cover's name comes from the scan that wrote it and the thumbnails' from `waveflow_core::artwork::thumbnails::thumbnail_path`, because a fixture that spelled either independently would agree with itself while the server did something else. Three removals, three failures: without the grace a live-looking cover is taken a pass early, without the thumbnail arm two files survive, without the row delete nothing is collected at all. Also corrected: the canvas module still said "No sweep exists yet" and "nothing collects those today", both written before #163 built the sweep three hundred lines below. Same drift as the test-target count — a document read as evidence about code that had moved on. Claude-Session: https://claude.ai/code/session_01TKQC2nhuzDygPEDYr3La4h Signed-off-by: InstaZDLL <github.105mh@8shield.net>
RFC-009 decision 6 said when a blob stops being referenced and by which transaction, and left open who picks up what a crash left behind. This is that, recorded as decision 10.
A sweeper in
spawn_upload_sweeper's shape: a pass at boot, then one a day. Orphans are made by failures rather than by use, so it is a repair pass — on a server that has not crashed it finds nothing and costs a directory listing.Three kinds of file, and only one is removed without reservation
A blob no
canvasrow names goes — under its own hash lock, with the count re-read inside it. Without that lock this sweeper would be the cause of the damage it exists to repair: a placement writes its file, and between that write and its row the sweep sees bytes nothing names and takes them, leaving the placement to commit a row whose file is gone.A working file —
<uuid>.part,<uuid>.silent— goes if it is older than an hour. Those names belong only to the call that wrote them: no row mentions them and there is no lock to take, so age stands in for both.Everything else is counted and left exactly where it was. The store lives under the operator's
data/. A sweep that deletes what it cannot name is one nobody should run, so a file is a candidate only if it is<64 hex>.<format>for a whitelisted format, or one of the two working names this module writes.A row naming a file that is gone is reported and never repaired. That is the failure decision 6 calls unrecoverable, and the repair would be to delete somebody's canvas — answering a dead link by making it a missing one.
Three guards removed to watch them fall
operator-notes.txtis takenThe lock is not among them, and is not claimed to be
Removing it fails nothing. The damage needs a placement and a sweep to interleave at one instant, and no test here can force that ordering. It is reasoned, not demonstrated, and the code says so where it is written.
Still open
artwork_dirhas the same property and no sweeper. It moves from a remark inside decision 6 to an open question of its own — it is the same work on another store, with references spread over three columns instead of one. Not the same caution, and not the same day.Gates
cargo fmt --all --check,cargo clippy --all-targets --all-features -- -D warnings,cargo test --all-features— 154 tests across fourteen targets, all green.Summary by CodeRabbit