d430dd8b71
Phase 4. core/exports/export_sources.py supplies the real I/O behind each waterfall source and assembles resolve_fn: cache -> DB (tracks.musicbrainz_recording_id via text match) -> file tag (UFID/musicbrainz_trackid) -> live MusicBrainz match_recording. Every source is fail-safe (any error -> None -> fall through, export never breaks). A fresh non-cache hit is written back to the persistent cache so the same song is free next export. Sources are injectable; build_resolve_fn wiring (cache short-circuit + write-back) is unit-tested. 4 tests.
59 lines
2 KiB
Python
59 lines
2 KiB
Python
"""Export source wiring (#903): waterfall order + cache write-back.
|
|
|
|
build_resolve_fn assembles cache -> DB -> file -> MusicBrainz and writes a fresh
|
|
(non-cache) hit back to the cache. Pins: a cache hit short-circuits everything and is
|
|
NOT re-written; a DB/MB hit IS written back; misses fall through; the resolving label is
|
|
returned.
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
from core.exports.export_sources import build_resolve_fn
|
|
from core.exports.mbid_resolver import SRC_CACHE, SRC_DB, SRC_MUSICBRAINZ
|
|
|
|
MBID = "e8f9b188-f819-4e43-ab0f-4bd26ce9ff56"
|
|
|
|
|
|
def _wire(db=None, file=None, mb=None, cache=None):
|
|
recorded = {}
|
|
store = dict(cache or {})
|
|
fn = build_resolve_fn(
|
|
db_fn=lambda a, t: (db or {}).get((a, t)),
|
|
file_fn=lambda a, t: (file or {}).get((a, t)),
|
|
mb_fn=lambda a, t: (mb or {}).get((a, t)),
|
|
cache_lookup=lambda k: store.get(k),
|
|
cache_record=lambda k, m: recorded.__setitem__(k, m) or True,
|
|
)
|
|
return fn, recorded
|
|
|
|
|
|
def test_cache_hit_short_circuits_and_is_not_rewritten():
|
|
from core.exports.mbid_resolver import normalize_key
|
|
fn, recorded = _wire(
|
|
cache={normalize_key("A", "T"): MBID},
|
|
db={("A", "T"): "should-not-reach"},
|
|
)
|
|
mbid, label = fn("A", "T")
|
|
assert (mbid, label) == (MBID, SRC_CACHE)
|
|
assert recorded == {} # cache hit -> no write-back
|
|
|
|
|
|
def test_db_hit_is_written_back_to_cache():
|
|
from core.exports.mbid_resolver import normalize_key
|
|
fn, recorded = _wire(db={("A", "T"): MBID})
|
|
mbid, label = fn("A", "T")
|
|
assert (mbid, label) == (MBID, SRC_DB)
|
|
assert recorded == {normalize_key("A", "T"): MBID} # fresh hit cached for next time
|
|
|
|
|
|
def test_falls_through_to_musicbrainz_and_caches():
|
|
fn, recorded = _wire(db={}, file={}, mb={("A", "T"): MBID})
|
|
mbid, label = fn("A", "T")
|
|
assert (mbid, label) == (MBID, SRC_MUSICBRAINZ)
|
|
assert list(recorded.values()) == [MBID]
|
|
|
|
|
|
def test_all_miss_returns_none_and_no_write():
|
|
fn, recorded = _wire()
|
|
assert fn("A", "T") == (None, None)
|
|
assert recorded == {}
|