feat: add SoulseekAdapter with injectable client seam

worker/lyra_worker/adapters/soulseek.py

@@ -0,0 +1,62 @@
+from typing import Callable, Protocol
+
+from lyra_worker.types import Candidate, DownloadResult, MBTarget, Quality
+
+
+class SoulseekClient(Protocol):
+    def is_configured(self) -> bool:
+        ...
+
+    def search_album(self, artist: str, album: str) -> list[dict]:
+        """Album matches: dicts with source_ref, title, artist, track_count, format, bitrate."""
+        ...
+
+    def download(self, source_ref: str, dest: str, on_progress: Callable[[float], None]) -> dict:
+        """Download into dest; return {track_count, path}. Raise on failure."""
+        ...
+
+
+def _quality(fmt: str, bitrate: int | None) -> Quality:
+    if fmt.upper() == "FLAC":
+        return Quality(fmt="FLAC", lossless=True, bit_depth=16, sample_rate=44100)
+    return Quality(fmt="MP3", lossless=False, bitrate_kbps=bitrate or 320)
+
+
+class SoulseekAdapter:
+    name = "soulseek"
+    tier = 1
+
+    def __init__(self, client: SoulseekClient):
+        self._client = client
+
+    def health(self) -> bool:
+        return self._client.is_configured()
+
+    def search(self, target: MBTarget) -> list[Candidate]:
+        candidates: list[Candidate] = []
+        for r in self._client.search_album(target.artist, target.album):
+            candidates.append(
+                Candidate(
+                    source="soulseek",
+                    source_ref=r["source_ref"],
+                    matched_artist=r.get("artist", ""),
+                    matched_album=r.get("title", ""),
+                    quality=_quality(r.get("format", "MP3"), r.get("bitrate")),
+                    track_count=r.get("track_count", 0) or 0,
+                    source_tier=self.tier,
+                )
+            )
+        return candidates
+
+    def download(
+        self, candidate: Candidate, dest: str, on_progress: Callable[[float], None]
+    ) -> DownloadResult:
+        try:
+            info = self._client.download(candidate.source_ref, dest, on_progress)
+        except Exception as e:
+            return DownloadResult(ok=False, error=str(e))
+        return DownloadResult(
+            ok=True,
+            path=info.get("path", dest),
+            track_count=info.get("track_count", candidate.track_count),
+        )

worker/tests/test_soulseek_adapter.py

@@ -0,0 +1,68 @@
+from lyra_worker.adapters.soulseek import SoulseekAdapter
+from lyra_worker.quality import quality_class
+from lyra_worker.types import MBTarget
+
+TARGET = MBTarget(artist="John Mayer", album="Continuum", track_count=12)
+
+
+class FakeSlskdClient:
+    def __init__(self, configured=True, results=None, fail=False):
+        self._configured = configured
+        self._results = results if results is not None else [
+            {"source_ref": "ref-flac", "title": "Continuum", "artist": "John Mayer",
+             "track_count": 12, "format": "FLAC", "bitrate": None},
+        ]
+        self._fail = fail
+
+    def is_configured(self):
+        return self._configured
+
+    def search_album(self, artist, album):
+        return self._results
+
+    def download(self, source_ref, dest, on_progress):
+        if self._fail:
+            raise RuntimeError("slskd boom")
+        on_progress(1.0)
+        return {"track_count": 12, "path": dest}
+
+
+def test_name_and_tier():
+    a = SoulseekAdapter(FakeSlskdClient())
+    assert a.name == "soulseek"
+    assert a.tier == 1
+
+
+def test_health_reflects_configuration():
+    assert SoulseekAdapter(FakeSlskdClient(configured=True)).health() is True
+    assert SoulseekAdapter(FakeSlskdClient(configured=False)).health() is False
+
+
+def test_flac_maps_to_lossless_candidate():
+    c = SoulseekAdapter(FakeSlskdClient()).search(TARGET)[0]
+    assert c.source == "soulseek"
+    assert c.source_ref == "ref-flac"
+    assert c.matched_artist == "John Mayer"
+    assert c.matched_album == "Continuum"
+    assert c.track_count == 12
+    assert c.source_tier == 1
+    assert c.quality.fmt == "FLAC"
+    assert c.quality.lossless is True
+    assert quality_class(c.quality) == 2  # CD lossless
+
+
+def test_mp3_maps_to_lossy_candidate():
+    results = [{"source_ref": "ref-mp3", "title": "Continuum", "artist": "John Mayer",
+                "track_count": 12, "format": "MP3", "bitrate": 320}]
+    c = SoulseekAdapter(FakeSlskdClient(results=results)).search(TARGET)[0]
+    assert c.quality.fmt == "MP3"
+    assert c.quality.lossless is False
+    assert c.quality.bitrate_kbps == 320
+    assert quality_class(c.quality) == 1  # lossy
+
+
+def test_search_empty_and_download_failure():
+    assert SoulseekAdapter(FakeSlskdClient(results=[])).search(TARGET) == []
+    bad = SoulseekAdapter(FakeSlskdClient(fail=True)).download(
+        SoulseekAdapter(FakeSlskdClient()).search(TARGET)[0], "/tmp/x", lambda _p: None)
+    assert bad.ok is False and bad.error