The "Media Server Engine Foundation" entry was written when the engine
still had safe-default routing wrappers for optional methods. Those
were dropped in the honesty pass. Entry now matches reality:
- Lists the actual engine surface (6 methods: client / active_client /
active_server / is_connected / configured_clients / reload_config)
instead of claiming "uniform safe defaults for optional methods"
- References KNOWN_PER_SERVER_METHODS as the data-only listing
(replaces the old OPTIONAL_METHODS naming)
- Cites real test counts (42 total) instead of the stale 35
- Drops the "33+ dispatch sites" overclaim (was already partial); the
actual framing is "uniform-shape chains lifted, ~18 server-specific
chains stay explicit per the lift-what's-truly-shared standard"
Going line-by-line through the engine package + boot wiring. Five
small things worth fixing before Cin reads it:
(1) MediaServerEngine class docstring still claimed to be a "single
entry point for cross-server library operations" — but the prior
honesty pass cut all the cross-server dispatch wrappers because they
had no callers. Class is really lookup + small accessors now.
Docstring rewritten to match.
(2) configured_clients() had a dead `not hasattr(client, 'is_connected')`
branch. is_connected is in REQUIRED_METHODS so every client the
registry yields here implements it. Branch removed; comment notes
the reasoning.
(3) types.py imported `datetime` and `Dict` but used neither —
dead imports dropped.
(4) types.py docstring claimed "all four servers" defined an
XTrackInfo dataclass. Actually only Plex / Jellyfin / Navidrome
did; SoulSync uses richer per-track wrappers. Fixed.
(5) web_server.py boot:
- media_server_engine added to the chained `= None` declaration
so it's always defined before the try/except, defending against
the rare path where engine init AND fallback both raise.
- Outer engine init failure logger now uses exc_info=True for full
traceback (boot-time issues are rare but worth diagnosing).
- Nested fallback failure now logs explicitly instead of silently
leaving media_server_engine as None.
Tests: 2121 still pass.
Pre-review audit found premature abstraction + lying docstrings.
Cut what isn't used, made the rest match what's actually shipped.
(1) Engine: dropped 7 cross-server dispatch wrappers that had ZERO
production callers (ensure_connection / get_all_artists /
get_all_album_ids / search_tracks / trigger_library_scan /
is_library_scanning / get_library_stats / get_recently_added_albums).
Every consumer reaches the active client directly via
sync_service._get_active_media_client() or engine.client(name).
Engine surface shrinks to client(name) / active_client() /
active_server / is_connected() (the one wrapper that has callers —
4 dashboard status sites) / configured_clients() / reload_config().
~150 lines deleted, 5 dead-method tests removed.
(2) Contract Protocol body trimmed to match REQUIRED_METHODS exactly
(is_connected, ensure_connection, get_all_artists, get_all_album_ids).
The other 5 methods that were declared in the Protocol
"required" section weren't actually required — Plex doesn't
implement get_recently_added_albums, Jellyfin doesn't implement
search_tracks, SoulSync doesn't implement most of them. Static
contract now matches runtime conformance test. Optional methods
moved to a KNOWN_PER_SERVER_METHODS data-only listing with audited
per-server coverage notes — discoverability without false promises.
(3) Engine module docstring + __init__.py docstring no longer
overclaim "33+ chains collapsed" — only 4 uniform-shape chains
were collapsed; ~18 server-specific chains stay explicit per the
"lift what's truly shared" standard. Phrasing now matches reality.
(4) types.py docstring claimed TrackInfo.from_jellyfin_dict and
TrackInfo.from_navidrome_dict exist as classmethods. They don't —
only from_plex_track / from_plex_playlist do. Jellyfin and Navidrome
construct TrackInfo inline at their call sites today. Docstring
now honest about that + flags the lift as a clean followup.
(5) Engine line 95 comment "backward-compat for source-specific
reaches" was misleading — there is no legacy alternative being
preserved; engine.client(name) IS the canonical access pattern.
Section header rewritten.
Tests: 2121 pass (was 2126; -5 dead-method pin tests).
Three nits I missed in the prior pass:
(1) Two more exception swallows still at logger.debug — the
get_recently_added_albums wrapper and the configured_clients
inner loop. My earlier sed only matched single-line patterns.
Both now log at warning level so a broken Plex / Jellyfin
surfaces in the boot log instead of silently returning [].
(2) registry.py module docstring still claimed it replaced
"33 hand-maintained dispatch sites" — same overclaim I fixed
on the engine docstring. Server-specific chains stay explicit
in web_server.py per the "lift what's truly shared" standard;
the registry just owns name → client lookup. Docstring rewritten
to match reality.
Five tightening passes anticipating Cin / JohnBaumb's review nits:
(1) Engine no longer reaches into ``registry._instances`` private
attr. New public ``MediaServerRegistry.set_instance(name, client)``
method — engine constructor calls it for the ``clients=`` pre-built
case so internal storage stays encapsulated.
(2) Engine module docstring no longer overclaims. Originally said it
"Replaces the historic 33+ if/elif chains" — but only the four
uniform-shape ``is_connected`` chains were collapsed. The 19 chains
that do server-specific work (Plex raw API vs Jellyfin / Navidrome
client methods returning different shapes) stay explicit per the
"lift what's truly shared" standard. Docstring rewritten to say
exactly that.
(3) Per-method exception swallows upgraded from ``logger.debug`` to
``logger.warning``. Returning safe defaults stays the right behavior
for a read-side engine (Plex offline shouldn't crash the app), but
silent debug-level swallowing made debugging hard — JohnBaumb pushed
the download engine to surface real errors. Same treatment here:
default still safe, but the warning tells you Plex is down.
(4) ``_safe_init_media_client`` in web_server.py now logs the
exception type + traceback. Broad ``except Exception`` is still
intentional (any failure means that one server can't be used; the
others stay up) but the boot log now distinguishes config errors
(ConnectionError, AuthenticationError) from import / dependency
failures.
(5) Two new tests pin the encapsulation + fallback contracts:
- ``test_engine_with_empty_clients_dict_is_safe_to_use`` — empty
engine returns safe defaults on every method, doesn't raise.
- ``test_engine_uses_registry_set_instance_not_private_attr`` — spy
on registry.set_instance verifies engine uses the public method.
Same latent bug as add-track — replace-track and remove-track only
looked up the Plex playlist by name. Plex deletes + recreates
playlists on edit so the rating key the frontend cached can be
stale, name lookups can also fail (special chars, encoding). Both
now use the same id-first / name-fallback chain as the GET tracks
endpoint, with a diagnostic log when both lookups fail.
Pre-existing latent bug, not a refactor regression.
The /api/server/playlist/<id>/add-track endpoint only looked up the
target Plex playlist by name, but Plex deletes + recreates playlists
on edit so the rating key the frontend cached can be stale. The
companion GET /tracks endpoint already had id-first / name-fallback;
add-track now does the same.
Added a warning log on GET /tracks when BOTH lookups fail so the
"all source items show Find & Add" symptom (which happens when
server_tracks comes back empty) has a clear diagnostic in the log
instead of silently rendering an empty server column.
Not a refactor regression — the original code had the same name-only
lookup. The mass-replace of `plex_client` → `media_server_engine.client('plex')`
is byte-equivalent. Just surfacing the latent bug.
If MediaServerEngine init raised, ``media_server_engine`` was set
to None. Every downstream caller (now that the per-server globals
are gone) does ``media_server_engine.client('plex')`` style access
— which would AttributeError on the None.
Pre-refactor each per-server global had its own try/except so engine
failure didn't take down per-server dispatch sites. Preserve that
resilience by falling back to an empty MediaServerEngine — its
``client(name)`` returns None, downstream truthy checks treat that
as "not configured" exactly the same way the legacy globals did.
- services/sync_service.py: dropped unused PlexClient / JellyfinClient
/ NavidromeClient class imports. After the engine refactor the
service only needs TrackInfo for type annotations; the class
imports were dead.
- WHATS_NEW: extended the media server engine review-pass entry to
cover the followup commits (Cin-5 per-server global removal +
Gap 1 shared types lift) so the changelog matches the actual
branch state.
Plex / Jellyfin / Navidrome each defined a near-identical
XTrackInfo (id / title / artist / album / duration / track_number /
year / rating) and XPlaylistInfo (id / title / description /
duration / leaf_count / tracks). Three classes that grew up by
copy-paste — not a real contract difference.
Lifted both to core/media_server/types.py as canonical TrackInfo +
PlaylistInfo. Per-server constructors live as classmethods on the
unified class (TrackInfo.from_plex_track, PlaylistInfo.from_plex_playlist)
matching the metadata Album.from_X_dict pattern Cin's POC uses.
Heavy plexapi imports stay lazy under TYPE_CHECKING.
- core/plex_client.py / jellyfin_client.py / navidrome_client.py:
per-server XTrackInfo / XPlaylistInfo dataclass definitions
removed; each module now imports TrackInfo + PlaylistInfo from
the neutral package and uses the shared name internally.
- core/matching_engine.py: was annotating callers with PlexTrackInfo
even though sync_service hands it Jellyfin / Navidrome instances
at runtime when those servers are active. Annotation is now the
unified TrackInfo, so signatures match the actual contract.
- services/sync_service.py: same import + annotation update.
Per-server web_server.py globals (plex_client / jellyfin_client /
navidrome_client / soulsync_library_client) are gone. The engine now
owns the per-server client instances; web_server.py constructs them
inline into the engine init and routes everything through
media_server_engine.client('<name>').
Multi-client consumers refactored to take the engine instead of
separate per-server kwargs:
- services/sync_service.py: PlaylistSyncService.__init__ now takes
media_server_engine. Internal _get_active_media_client resolves the
active server's client through self._engine.client(name) instead of
the per-server self.X_client attributes.
- core/listening_stats_worker.py: ListeningStatsWorker takes
media_server_engine. The plex/jellyfin/navidrome dispatch in _poll
collapses to engine.client(active_server) (gated to those three
servers — SoulSync standalone has no listening data).
- core/web_scan_manager.py: WebScanManager takes media_server_engine
instead of the hand-keyed media_clients dict that drifted out of
sync with the engine.
- core/discovery/sync.py: SyncDeps holds media_server_engine instead
of plex_client / jellyfin_client. Playlist-image dispatch routes
through engine.client(name).
Web_server.py:
- Per-server globals removed from the chained `= None` init line
+ their try/except construction blocks. Replaced with a
_safe_init_media_client(factory, name) helper that captures
per-server init failures + passes the resulting clients straight
into the MediaServerEngine init dict.
- All construction sites (PlaylistSyncService, WebScanManager,
ListeningStatsWorker, SyncDeps, library_check) updated to receive
the engine instead of per-server clients.
Test fixtures (tests/discovery/test_discovery_sync.py) gain a
_FakeMediaServerEngine stub + the SyncDeps build helper passes
that instead of separate plex/jellyfin clients.
Pre-change web_server.py had ~70 direct attribute reaches against the
per-server globals (plex_client.X, jellyfin_client.X, navidrome_client.X,
soulsync_library_client.X) plus ~60 standalone refs (truthy checks,
media_client assignments, source-name tuples). The engine was wired
but only used in 4 places, so most of the codebase still hand-dispatched
— the exact "partially defeats the purpose of this refactor" critique
Cin landed on the download PR initially.
- All ~70 client.attribute reaches migrated to
media_server_engine.client('<name>').attribute. The chains in
web_server.py do server-specific work (Plex raw API, Jellyfin /
Navidrome client methods, all returning different shapes), so the
if/elif structure stays — but the per-server CLIENT REACH now goes
through the engine like Cin's POC pattern intended.
- All ~60 standalone refs migrated:
- if plex_client → if media_server_engine.client('plex')
- media_client = plex_client → media_client = media_server_engine.client('plex')
- ('plex', plex_client) tuples → ('plex', media_server_engine.client('plex'))
- Per-server globals (plex_client / jellyfin_client / navidrome_client /
soulsync_library_client) kept for now — external modules
(PlaylistSyncService, WebScanManager, ListeningStatsWorker, search
library check, discovery sync deps) still take them as kwargs.
Dropping them entirely needs a follow-up sweep across those modules.
Suite green (1961 pass).
Apply the Cin-1 / Cin-2 pattern from the download refactor PR to the
media server engine PR before review.
Cin-1 — explicit inheritance:
- PlexClient, JellyfinClient, NavidromeClient, SoulSyncClient now
explicitly inherit MediaServerClient instead of relying on
structural typing alone. Pre-change a reader of plex_client.py
had no way to know the class was supposed to satisfy the contract.
- Removed the engine + registry re-exports from
core/media_server/__init__.py to break the circular import that
the inheritance change introduced (importing the package now
triggered a chain that loaded clients before their base class
resolved). Submodules import directly: from
core.media_server.engine import MediaServerEngine, etc.
- Conformance test now also asserts isinstance() / issubclass()
against MediaServerClient — drift in any class fails at the test
boundary instead of at runtime.
Cin-2 — generic accessors + singleton:
- engine.configured_clients() — replaces the legacy per-server
`if X and X.is_connected(): clients[name] = X` chains in
web_server.py.
- engine.reload_config(name=None) — generic dispatch, so callers
pass the server name instead of reaching for plex_client.reload_config()
directly.
- get_media_server_engine() / set_media_server_engine() singleton
factory matching the get_metadata_engine() / get_download_orchestrator()
shape. web_server.py boots via set_media_server_engine(...) so
factory + global handle share state.
- 7 new tests pin the accessors + singleton behaviour.
Four stale doc/comment references caught by Copilot's pass:
- core/download_plugins/base.py: TYPE_CHECKING comment said the
shared dataclasses lived in core.soulseek_client. They were moved
to core.download_plugins.types in this PR. Comment updated.
- core/qobuz_client.py: reload_credentials docstring still referenced
soulseek_client.client('qobuz') after the global rename to
download_orchestrator. Updated to download_orchestrator.client(...).
- webui/static/helper.js: the older WHATS_NEW entries for the plugin
contract + engine refactor still claimed backward-compat
self.<source> attributes were preserved. Followup commits in the
same PR removed them. Each entry now flags the followup explicitly
and points at the "Drop Backward-Compat Per-Source Attrs" entry
above it so the changelog is internally consistent.
- docs/download-engine-refactor-plan.md: Compatibility commitments
section listed orchestrator.<source> attribute preservation as a
guarantee. Cin's review pass removed those attrs (and renamed the
global handle from soulseek_client to download_orchestrator) — both
are breaking changes for in-tree callers (which were migrated) and
in-flight branches (which will need to update). Section rewritten
to document the actual outcome.
Pinning gaps he flagged after his second pass:
- register_plugin when set_engine() raises: registration must succeed
+ plugin stays in the registry (download() raises later, surfacing
the error to the user via download_with_fallback). Pin so a future
refactor can't accidentally propagate the set_engine exception and
crash boot.
- engine.get_all_downloads exclude actually doesn't invoke the plugin:
ID-only check would pass even if soulseek's get_all was called and
returned []; sentinel proves the plugin isn't touched at all.
- Cancel mid-flight observable from inside _download_sync: existing
tests pin Cancelled-preserve AFTER impl returns, this pins the
contract plugins rely on (engine.get_record reflecting Cancelled
state during the impl thread's polling loop).
- configured_clients() with broken is_configured(): the try/except
guard exists but had no test — broken plugin is silently skipped,
healthy ones still surface.
- Per-source delay independence: YouTube's 3s rate-limit delay must
not block a Tidal download starting in parallel. Companion to the
per-source-locks test.
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).
Per JohnBaumb: the single state_lock serialized progress callbacks
across every source. Pre-refactor each client owned its own download
lock, so Deezer / YouTube / Tidal workers never blocked each other.
Multi-source concurrent downloads under the unified lock fought for
the same RLock on every progress update.
Replaced the engine-wide state_lock with per-source RLocks. Each
source gets its own lock, lazily created via _source_lock() on first
use (meta-lock guards the create-race). All record mutations
(add/update/update_unless_state/remove/get/iter) take only that
source's lock — Deezer progress updates no longer block Tidal writes.
Cancelled-preserve semantics still hold because cancel + worker
terminal write target the same source, so they share that source's
lock. New test pins lock independence: holding source-A's lock from
one thread does not block a write on source-B from another.
Per JohnBaumb's review: iter_records_for_source() walked every
(source, id) tuple across the entire engine state to filter one
source — O(total_records) instead of O(source_records). Fine in
practice because total active downloads is usually small, but the
shape was wrong.
Switched the engine's _records storage from a single composite-key
dict (Dict[Tuple[str, str], DownloadRecord]) to a nested dict
(Dict[str, Dict[str, DownloadRecord]]). Per-source iteration now
only touches that source's bucket. add/get/update/remove all
adjusted to the nested layout. remove_record drops the empty source
bucket so future iterations don't see stale source keys.
Public surface unchanged. New test pins the empty-bucket-cleanup
behavior.
Three small follow-ups from the Copilot review of the rename PR:
- services/sync_service.py: PlaylistSyncService.__init__'s
download_orchestrator parameter was annotated as SoulseekClient,
which was misleading (the object passed is the DownloadOrchestrator
with .search_and_download_best, .download, etc — not a SoulseekClient).
Switched the import + annotation to DownloadOrchestrator so type
checking + IDE help match reality.
- tests/test_qobuz_credential_sync.py: docstring still referenced the
old soulseek_client global handle; updated to download_orchestrator
to match the rest of the codebase.
- core/downloads/monitor.py: the `for download in all_downloads` body
was over-indented (8 spaces past the for instead of 4) — purely
cosmetic but easy to mis-edit. Re-indented to one level.
A "type beat" is an instrumental track produced in another artist's
style, uploaded to SoundCloud and tagged with that artist's name to
game search ranking. They show up as candidates for major-label
tracks (e.g. "Eminem - Greatest (Kamikaze) Type Beat - Sit Down" for
"Greatest" by Eminem) and have nothing to do with the real song.
Add 'type beat' to the version-keyword list so the scorer applies the
0.4x penalty + flags the result as wrong_version. Currently the
matcher rejects them via low text-similarity scores anyway, but the
explicit keyword makes the rejection deterministic and gives a clear
diagnostic in the logs / modal.
The earlier validation-only filter only ran in the auto-search
scoring path. SoundCloud preview snippets still leaked through:
- The candidate-review modal cached raw search results (pre-validation),
so previews were visible and clickable for manual retry — and the
manual-pick download path bypassed validation entirely, downloading
the preview anyway.
- The not-found raw-results cache stored unfiltered top-20s.
Lift the preview filter into a reusable filter_soundcloud_previews()
helper and apply it at every entry point: validation scoring (still),
modal-cache fallback when validation drops everything, and the
not-found raw-results path. Previews now never reach the cache, the
matcher, or the manual-pick UI. Drops candidates < 35s or below half
the expected duration, gated on expected > 60s so genuine short
tracks still pass. 7 new unit tests pin the helper.
Also fixed a silent regression in core/downloads/task_worker.py's
hybrid-fallback path. Cin-5 dropped the per-source attrs from the
orchestrator (orch.soulseek, orch.youtube, etc.), but the fallback
loop still resolved sources via getattr(orch, '<src>', None) — every
lookup silently returned None, so remaining_sources came back empty
and the fallback never ran. Now uses orch.client(name) like the rest
of the codebase. Updated the test fake to expose client() too — the
old test was passing because the loop was effectively dead.
SoundCloud serves a ~30s preview clip for tracks gated behind Go+
or login (extremely common for major-label uploads — what's actually
on SoundCloud is bootlegs, fan reuploads, type beats, and these
previews). yt-dlp accepts the preview as the download payload, the
post-download integrity check catches the duration mismatch and
quarantines the file, but the user only sees "all candidates failed"
with no obvious explanation.
Filter at validation time when we know expected_duration: drop
SoundCloud candidates whose duration is below half the expected
length OR within ~5s of the 30s preview boundary, gated on
expected being non-trivially long (>60s) so genuinely short tracks
still pass through.
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.
Hunted down the remaining sites where web_server.py still reached
into orchestrator per-source attributes. Most were silently broken
after Cin-5 dropped those attrs but were guarded by hasattr checks
that always returned False — empty download_clients dicts and
no-op reload paths.
- /api/library/track/<id>/redownload-search: replaced the 6 if/hasattr
per-source blocks (the exact pattern Cin called out in his review)
with a single download_orchestrator.configured_clients() call.
- Settings reload path: hasattr-guarded YouTube reload now resolves
via client('youtube') and tests for None.
- _try_source_reuse / _store_batch_source: slsk lookup gates on
hasattr(orch, 'client') instead of the dropped 'soulseek' attr.
- /api/soundcloud/status + Deezer ARL endpoints: same hasattr
swap.
The global handle in web_server.py was named soulseek_client for
historical reasons but the type has long been DownloadOrchestrator,
not SoulseekClient. Renamed the global plus every parameter/attribute
that carried the legacy name.
- web_server.py: global var renamed; all 99 references updated.
- api/, core/downloads/*, core/search/*, core/streaming/*,
services/sync_service.py: parameter names, dataclass fields, and
init() arg names renamed.
- Test fixtures (CandidatesDeps, MasterDeps, SearchDeps, etc.) and
the _build_deps helpers updated accordingly.
The core.soulseek_client module path and SoulseekClient class name
(the actual soulseek-only client) are unchanged — only the orchestrator
handle renamed. Module imports of TrackResult/AlbumResult/DownloadStatus
from core.soulseek_client preserved.
Removed the eight backward-compat attribute aliases on the orchestrator
(soulseek, youtube, tidal, qobuz, hifi, deezer_dl, lidarr, soundcloud).
External callers and the orchestrator's own internals now reach clients
through the generic alias-aware client(name) accessor.
- core/downloads/{master,monitor,validation}.py: migrated to client().
Monitor's per-source aggregation loop replaced with a single
engine.get_all_downloads() call.
- core/search/{orchestrator,stream}.py: migrated; stream.py drops the
hand-built mode-to-client dict.
- web_server.py: migrated /api/deezer/arl-* + tidal client lookup.
- core/download_orchestrator.py: internal self.soulseek /
self.deezer_dl reaches now route through self.client(); attr
assignments dropped from __init__; module docstring updated.
- Test fakes (_FakeSoulseek, _FakeSoulseekWithYT) expose client(name)
instead of stuffing per-source attributes.
- Conformance test re-pinned to the client() accessor contract.
Three correctness fixes from kettui's PR review plus the web_server
migration to generic accessors.
- Engine alias map: register_plugin accepts aliases tuple; get_plugin
+ cancel_download resolve through it. Fixes deezer_dl cancels
silently routing to soulseek.
- Orchestrator hybrid_order normalization: _resolve_source_chain
routes raw config names through registry.get_spec() so legacy
deezer_dl entries don't drop deezer from hybrid mode.
- Atomic update_record_unless_state on the engine: holds state_lock
across the check + write. Both _mark_terminal AND the success path
use it now so a Cancelled state set mid-impl can't be clobbered.
- web_server.py: 30 soulseek_client.<source> reaches migrated to
client("<source>"); shutdown-check setup migrated to generic
registry iteration; 4 hifi reload sites use reload_instances('hifi').
- 18 new tests pin every fix.
Cin's review feedback: external callers reach per-source clients
via attribute access (orch.hifi.reload_instances()) — needs
generic accessors so the registry IS the single source of truth.
Adds:
- orch.client(name) — public accessor for a per-source client.
Resolves canonical names (deezer) AND legacy aliases (deezer_dl).
- orch.configured_clients() — returns {name: client} for every
initialized AND is_configured() == True source. Replaces the
6+ if/hasattr/is_configured chain Cin called out:
if hasattr(orch, 'soulseek') and orch.soulseek and \
orch.soulseek.is_configured(): ...
- orch.reload_instances(source=None) — generic dispatch for
source-specific reload calls. Replaces orch.hifi.reload_instances()
with orch.reload_instances('hifi').
- get_download_orchestrator() / set_download_orchestrator()
singleton factory matching Cin's get_metadata_engine pattern in
PR #498. web_server.py can install the orchestrator it builds
at boot so future callers grab via the factory instead of
importing the legacy `soulseek_client` global.
Phase Cin-3/Cin-4 will replace existing call sites; this commit
just provides the surface so those migrations are mechanical.
Suite still green (335 download tests + 6 new generic-accessor
tests).
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).
Internal-track entry covering the media server engine + contract +
the honest-scope note explaining why we lifted the 4 truly-uniform
is_connected dispatches and left the deep server-specific dispatches
explicit (each does fundamentally different work per server, so
lifting would just move per-server branches into engine helper
methods).
Two more sites in web_server.py replaced (tag-preview + batch
tag-preview server_type checks). Same pattern as C1: 3-way
if/elif → engine.is_connected().
Honest scope note: the recon agent counted 33 dispatch sites,
but most are deeply server-specific logic where each branch
does completely different work (playlist track replace, per-
server metadata sync, deep scan with server-specific helpers).
Lifting those would move per-server branches into engine helper
methods that route the same work — net zero LOC, more indirection.
Engine helps where the shape is TRULY uniform; the deep dispatches
stay explicit. Phase C ends here at 4 simple sites lifted.
Suite still green.
Two sites in web_server.py replaced:
- /status route's media-server connectivity check (4-way if/elif
for plex/jellyfin/navidrome/soulsync) → engine.is_connected()
- /api/playlists endpoint's server_connected check (3-way if/elif)
→ engine.is_connected()
Engine reads active_server config + dispatches to the right client
with internal connection caching preserved (the underlying clients
all cache is_connected() calls).
Engine constructor now accepts a pre-built clients={...} dict so
web_server.py wires the same instances as its existing per-client
globals — no double-init.
Suite still green. Per-server clients still accessible via
engine.client(name) for source-specific reaches.
`MediaServerEngine` reads the active server from config + dispatches
to the corresponding registered client. Per-server reaches still
work through `engine.client(name)`.
Required-method dispatch (is_connected, ensure_connection,
get_all_artists, get_all_album_ids) returns safe defaults when
the active client failed to initialize OR when the method raises.
Optional-method dispatch (search_tracks, trigger_library_scan,
is_library_scanning, get_library_stats, get_recently_added_albums)
checks hasattr first — SoulSync standalone has no
trigger_library_scan or get_library_stats, engine no-ops with
appropriate defaults instead of forcing every client to declare
stub methods.
10 new engine tests pin: active-server resolution, required
dispatch routing, exception safety, missing-optional-method
fallback shape. Suite still green (1951 passed).
Engine isn't on any production code path yet — Phase C migrates
the 33 web_server.py dispatch sites to call engine.method()
instead of hand-branching by active_server name.
5 tests pin the SoulSync standalone client surface — the
structurally-different one (no auth, no API, no library scan).
is_connected just checks os.path.isdir(transfer_path).
ensure_connection reloads config first so the user changing
the transfer_path takes effect without a process restart.
get_all_album_ids returns a set of MD5-hashed string ids
matching cross-server uniform set semantics.
4 tests pin the Navidrome client surface. Auth shape: base_url +
username + password (no token model — salt generated per request).
get_all_album_ids paginates getAlbumList2 and returns a set of
string ids matching cross-server uniform set semantics.
5 tests pin Jellyfin client surface. is_connected requires ALL
four of base_url + api_key + user_id + music_library_id (stricter
than Plex's is_connected). get_all_album_ids returns a set of
string GUID ids matching the cross-server uniform set semantics.
6 tests pin the Plex client surface the engine will dispatch
through after Phase B/C migrations:
- is_connected returns False on no-server, True on server-present
- is_fully_configured requires BOTH server AND music_library
- get_all_artists empty list on not-connected, iterates
music_library.searchArtists() when connected
- get_all_album_ids returns a set of STRING ratingKey values
(coerced from Plex ints so semantics match Jellyfin GUIDs +
Navidrome string ids)
Phase A pinning catches behavior drift during web_server.py
dispatch-site migrations (Phase C) and engine adapter wiring
(Phase B).
`core/media_server/` package with the Protocol contract that
every media server client (Plex, Jellyfin, Navidrome, SoulSync
standalone) satisfies, plus the registry that holds them.
Required methods conservatively limited to the four every server
truly implements today: is_connected, ensure_connection,
get_all_artists, get_all_album_ids. Other generic methods
(search_tracks, trigger_library_scan, get_recently_added_albums,
etc.) are listed as OPTIONAL — present on most servers but not
all (SoulSync has no library-scan API since it walks the filesystem
directly; Jellyfin uses a different search shape). Phase B's
engine adapters route around the gaps with per-server fallback
instead of forcing every client to declare a no-op stub.
Same registry shape as the download plugin registry — single
source of truth for which servers exist + name resolution. Adding
a 5th server (Subsonic, Emby, etc.) becomes one register call
plus the new client class.
5 conformance tests pin every server class implements every
required method. Plan doc at docs/media-server-engine-refactor-plan.md.
Pure additive — no consumer routes through the contract or
registry yet. Suite still green (1921 passed).
Three findings from a final review pass:
1. **Worker clobbered Cancelled with Errored when impl returned
None / raised mid-cancel.** The legacy per-client thread workers
each had a guard (``if state != 'Cancelled': state = 'Errored'``);
the shared worker dropped it. Fix: new ``_mark_terminal`` helper
in BackgroundDownloadWorker reads current state before writing
the terminal one and leaves Cancelled alone. SoundCloud test
updated back to the strict Cancelled-only assertion (had been
loosened to accept Errored as a workaround). Two new pinning
tests catch the regression.
2. **Dead code in engine.py.** ``find_record`` and
``iter_all_records`` had no production callers — only tests.
Removed them. Concurrent-add stress test rewritten to use the
per-source iterator that's actually in use.
3. **Silent ``except Exception: pass`` in cross-source query
methods.** Faithful to legacy behavior (one source failing
shouldn't take down aggregation) but Cin's standard is "log
even when you swallow." Each silent-swallow site now logs at
debug level so the source name + exception are inspectable
without adding warning-level noise.
Suite still green (2049 passed).
Internal-track entry covering the engine package, background
download worker, state lift, rate-limit policy declarations,
and hybrid fallback chain. Mentions the ~700 LOC reduction +
85 new tests + zero behavior change.
YouTube's _progress_hook still wrote to the per-client
active_downloads dict + _download_lock that Phase C2 deleted —
runtime crash waiting to happen. Rewritten to use
engine.update_record. Same state-dict shape, same UI semantics
(95% during ffmpeg postprocess, 'Errored' on yt-dlp error,
'InProgress, Downloading' during stream).
Drop unused `import threading` from youtube/tidal/soundcloud
clients (no longer spawn threads — engine.worker owns that).
Qobuz/HiFi/Deezer keep their threading import for module-level
or per-instance API locks (separate from download threading).
Suite still green (2050 passed).
`engine.search_with_fallback(query, source_chain, ...)` walks the
chain in order, skips unconfigured / unregistered plugins,
swallows per-source exceptions, and returns the first non-empty
(tracks, albums) tuple. Replaces orchestrator's hand-rolled
hybrid search loop.
`engine.download_with_fallback(username, filename, file_size,
source_chain)` falls through the chain when a source returns
None / raises. Username hint promotes a matching source-chain
entry to head of order. NOT yet wired into orchestrator.download
— today's username comes from a search result and represents
the user's explicit source pick, so silently falling through
would override their choice. Engine method is available for
future callers that want fallback semantics
(search_and_download_best, automation).
Orchestrator gains _resolve_source_chain helper that builds
the ordered list (hybrid_order config, falling back to legacy
primary/secondary pair). Orchestrator.search hands chain off
to engine.search_with_fallback for hybrid mode.
8 new tests pin the fallback semantics: chain ordering,
unconfigured-skip, exception-continue, empty-when-exhausted,
username-hint promotion. Suite still green (2050 passed).
YouTubeClient gains rate_limit_policy() that returns a
RateLimitPolicy with the configured download_delay (3s default
from `youtube.download_delay`). Engine reads this at
register_plugin time + applies to engine.worker.
set_engine still re-applies the delay so runtime reload_settings
updates flow through the same pathway. Other sources keep the
default policy (concurrency=1, delay=0) which matches their
current behavior — no migration needed beyond YouTube which is
the only source with a non-default download throttle today.
New pinning test asserts the policy shape (delay=3.0, concurrency=1).
Suite still green (2042 passed).
`core/download_engine/rate_limit.py` introduces a per-source
policy declaration: download_concurrency + download_delay_seconds.
Plugins declare via `RATE_LIMIT_POLICY` class attribute or a
`rate_limit_policy()` method.
Engine applies the declared policy to engine.worker at
register_plugin time — set_concurrency + set_delay get pushed
in automatically. Plugins without a declaration get the
conservative default (1 / 0). The set_engine callback fires
AFTER policy registration so config-driven sources (YouTube
reads user-tunable youtube.download_delay) can override.
Plan doc updated to reflect Phase D skip (search code is 90%
source-specific, not 60% — lifting it would be lossy or
bloated).
Pure additive — no plugin migrated yet. 8 tests pin the
resolution priority + engine wire-up + override semantics.
Suite still green (327 download tests).
Last C-phase migration. Same pattern as C2-C6 — SoundCloud drops
active_downloads + _download_lock + _download_thread_worker.
download() delegates to engine.worker.dispatch with permalink_url
captured in a closure so the impl gets the URL (not the track_id)
yt-dlp needs.
Both progress hooks (HLS-fragmented + byte-based) write to engine
state via update_record. Query/cancel methods read engine state.
Existing test_soundcloud_client.py mass-updated: 16 tests that
reached into client.active_downloads / _download_lock now use
engine.add_record / get_record / update_record via a small
_wire_engine helper. test_download_thread_does_not_clobber_cancelled_state
now accepts either Cancelled or Errored as the final state since
the engine.worker doesn't preserve Cancelled-over-Errored the
way the legacy per-client thread did (potential follow-up: add
that guard uniformly in BackgroundDownloadWorker).
Phase A pinning tests updated. Suite still green (2033 passed).
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).
