Two findings from JohnBaumb on the engine refactor.
(1) Every download client returned None when self._engine was None,
just logging an error. The orchestrator's download_with_fallback
treated None as "source declined", so the user got no feedback —
download silently disappeared. Now each client raises a RuntimeError
on the engine-not-wired path. download_with_fallback already catches
plugin exceptions, logs a warning, and tries the next source — so
the visible behavior is "real error in logs + fallback to next
source" instead of "silent drop". Six clients touched (deezer, hifi,
qobuz, soundcloud, tidal, youtube). Pinning tests updated to expect
raise.
(2) Monitor's engine.get_all_downloads() walked every plugin
including soulseek, but the same monitor loop already pulled slskd
transfers via the transfers/downloads endpoint a few lines earlier —
soulseek's records were being fetched twice per tick. Same issue in
web_server.py's get_cached_transfer_data path. Added an exclude
parameter to engine.get_all_downloads(); both call sites now pass
('soulseek',). New test pins the exclude semantic.
Also fixed a stray 8-space over-indent on the for-loop body in
get_cached_transfer_data (cosmetic, JohnBaumb flagged the same
pattern in monitor.py earlier).
Two architectural cleanups on top of the download engine refactor.
(1) Shared dataclasses move to neutral plugin package.
TrackResult, AlbumResult, DownloadStatus, SearchResult lived in
core/soulseek_client.py for historical reasons — every other plugin
imported them from the soulseek module just to satisfy the contract,
coupling 8 clients to a sibling source for type imports only. Moved
them to the new core/download_plugins/types.py module and updated all
14 import sites across the deezer/hifi/lidarr/qobuz/soundcloud/tidal/
youtube clients, the engine, matching engine, redownload helper, and
tests. Clean break, no backward-compat re-export.
(2) web_server.py boots the orchestrator via the singleton factory.
After construction it now calls set_download_orchestrator(...) so
get_download_orchestrator() returns the same instance the global
handle points at instead of lazily building a separate orchestrator.
Matches the get_metadata_engine() pattern.
Cin's review feedback: the plugin contract was discoverable only
from the registry, not from the client files themselves. Reading
`youtube_client.py` cold gave no signal that the class participates
in the DownloadSourcePlugin contract.
Every download client class now inherits DownloadSourcePlugin
explicitly:
- SoulseekClient(DownloadSourcePlugin)
- YouTubeClient(DownloadSourcePlugin)
- TidalDownloadClient(DownloadSourcePlugin)
- QobuzClient(DownloadSourcePlugin)
- HiFiClient(DownloadSourcePlugin)
- DeezerDownloadClient(DownloadSourcePlugin)
- SoundcloudClient(DownloadSourcePlugin)
- LidarrDownloadClient(DownloadSourcePlugin)
Adjustments:
- core/download_plugins/base.py — moved TrackResult/AlbumResult/
DownloadStatus imports under TYPE_CHECKING since they're only
used in type annotations. Without this, clients inheriting the
contract create a circular import.
- core/download_plugins/__init__.py — drops DownloadPluginRegistry
re-export. Importing the package no longer triggers the registry's
eager client imports (which would also be circular for clients
that import from the package). Callers that need the registry
import it directly: `from core.download_plugins.registry import
DownloadPluginRegistry`.
Suite still green (335 download tests).
Same migration pattern as C2-C5. Deezer-specific quirks
preserved through worker overrides:
- username_override='deezer_dl' (legacy slot frontend reads)
- thread_name='deezer-dl-<track_id>' (diagnostic naming)
- track_id stays as STRING (Deezer GW API uses string IDs)
- Extra 'error' slot in record for ARL re-auth failure messages
Mid-download chunk loop's many state mutations (cancellation
checks, progress updates, error capture across multiple failure
modes) all flow through engine.update_record / get_record now.
Added _set_error and _is_cancelled helpers to keep call sites
readable.
Pinning tests updated. Suite still green (319 download tests).
PR #340 added ruff to the build-and-test.yml CI gate, which surfaced
286 pre-existing lint errors. Left unfixed, every feature branch push
fails CI. This commit resolves all of them so CI goes green and
contributors can actually land work.
Auto-fixes (248 of 286): removed unused f-string prefixes (F541),
renamed unused loop control variables with underscore prefix (B007),
removed duplicate imports (F811).
Manually fixed 10 latent bugs ruff caught (all wrapped in try/except
today, silently failing):
- music_database.py: _add_discovery_tables() called undefined
conn.commit() — would have crashed the iTunes-support migration
for existing databases. Now uses cursor.connection.commit().
- web_server.py settings GET: referenced undefined download_orchestrator
when it should be soulseek_client. Feature (_source_status on the
settings payload) was silently missing for UI auto-disable logic.
- web_server.py _process_wishlist_automatically: active_server
undefined in track-ownership check. Auto-wishlist was falling
through to the error handler and re-downloading owned tracks.
- web_server.py start_wishlist_missing_downloads: same active_server
bug in the manual wishlist path.
- web_server.py _process_failed_tracks_to_wishlist_exact: emitted
wishlist_item_added automation event with undefined artist_name
and track. Automation event silently never fired correctly.
- web_server.py discovery metadata enrichment: referenced cache
without calling get_metadata_cache() first. Track enrichment from
cached API responses was silently skipped.
- web_server.py Beatport discovery worker: wing-it fallback branch
used undefined successful_discoveries variable. Wing-it counter
never incremented correctly. Now uses state['spotify_matches']
consistently with the rest of the function.
- web_server.py _run_full_missing_tracks_process: stale import json
mid-function shadowed the module-level import, making an earlier
json.dumps() call reference an unbound local (F823).
- web_server.py discovery loop: platform loop variable shadowed
the module-level platform import (F402).
- core/watchlist_scanner.py: 7 lambda captures of loop variables
(B023 classic Python closure-in-loop bug) now bind at creation.
No existing tests had to change. Full suite stays at 263 passed.
Builds a new Your Albums section on the Discover page that aggregates
saved/liked albums from all connected services, mirroring the Your Artists
pattern. Deezer works via both OAuth and ARL.
- tidal_client: add get_favorite_albums() with V2/V1 API fallback
- deezer_client: add get_user_favorite_albums() via OAuth (user/me/albums)
- deezer_download_client: add get_user_favorite_albums() via ARL session
- music_database: add liked_albums_pool table (deduped by artist::album
normalized key), upsert_liked_album, get_liked_albums,
get_liked_albums_last_fetch, clear_liked_albums
- web_server: GET /api/discover/your-albums (ownership-checked, paginated),
GET /api/discover/your-albums/sources, POST /api/discover/your-albums/refresh,
_fetch_liked_albums background worker (Spotify + Tidal + Deezer OAuth/ARL)
- frontend: Your Albums section with source selector cog, album grid reusing
spotify-library-card styles, search/filter/sort/pagination, download missing
button, auto-refresh poll on first load
Also fix: Deezer greyed out in Your Artists sources when using ARL — connection
check now accepts ARL auth (deezer_dl.is_authenticated()) in addition to OAuth,
and _fetch_and_match_liked_artists falls back to ARL client for artist fetching.
Add get_user_favorite_artists(limit=200) to DeezerDownloadClient to fetch a user's favorite artists via the public API using an ARL-authenticated session (paginated, error-handled, returns deezer_id, name, image_url).
Update web_server to treat Deezer as connected if either OAuth or ARL is authenticated, and to fetch favorite artists from OAuth client when available or from soulseek_client.deezer_dl (ARL) otherwise. Fetched artists are upserted into the database and appropriate log/console messages and counters are updated.
Sync rehydration: after loading Deezer ARL playlists, checks each
for active syncs via /api/sync/status and re-attaches polling with
live card updates. Download rehydration: rehydrateModal now handles
deezer_arl_ playlist IDs, and openDownloadMissingModal routes cache
misses to the correct ARL endpoint. Fix All now prompts for dead
file action.
Album data caching: get_playlist_tracks now checks the metadata
cache before fetching album release dates from the Deezer API.
Cache hits are instant, misses are fetched and stored for future
use across all playlists. Import fixed from core.metadata_cache
instead of web_server to avoid circular dependency.
New "Deezer" tab on sync page shows authenticated user's playlists,
identical to the Spotify tab pattern — same card layout, details
modal with track list, sync button, and download missing tracks
flow. Existing URL import renamed to "Deezer Link" tab (unchanged).
Backend: get_user_playlists() and get_playlist_tracks() on the
download client fetch via public API with ARL session cookies.
Album release dates batch-fetched for $year template variable.
Three new endpoints: arl-status, arl-playlists, arl-playlist/<id>.
Frontend: cards use Spotify-identical HTML structure with live sync
status, progress indicators, and View Progress/Results buttons.
Downloads reuse openDownloadMissingModal with zero modifications.
Track data cached on first open, instant on subsequent clicks.
Deezer client imports config_manager locally in __init__ and stores
it as self._config, unlike the other clients which import at module
level. The allow_fallback line was referencing the wrong name.
Each streaming source (Tidal, Qobuz, HiFi, Deezer) now has an "Allow
quality fallback" checkbox in Settings. When disabled, the source only
tries the exact quality selected — if unavailable, it skips and lets
the orchestrator try the next source. Default is ON (current behavior).
Broque Thomas
Antti Kettunen