docs: add YouTube adapter plan (slice 1, plan 3b)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jonathan
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# Lyra YouTube Adapter Implementation Plan
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> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
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**Goal:** Ship Lyra's first REAL source adapter — YouTube via yt-dlp — implementing the existing `SourceAdapter` contract, and wire it into `registry.build_adapters()` so the running worker actually acquires music from YouTube. The adapter's logic is unit-tested offline against a fake yt-dlp client; the real network path is exercised only by an opt-in live test the user runs.
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**Architecture:** `YouTubeAdapter` depends on a small injectable `YtClient` seam (two methods: `search_album`, `download`). Tests inject a `FakeYtClient` returning recorded-shape dicts — no network, no credentials, deterministic. The real `YtDlpClient` wraps `yt_dlp.YoutubeDL` and is constructed only inside `registry.build_adapters()`. Adding YouTube changes nothing in the pipeline/ranker/confidence — they already operate purely on `Candidate`/`SourceAdapter`.
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**Tech Stack:** Python 3.12 worker; `yt-dlp` (new dependency); `ffmpeg` in the worker image (for `FFmpegExtractAudio`). Tests: pytest with a fake client (offline) + an opt-in live test gated by `LYRA_LIVE_TESTS`.
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## Global Constraints
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- Python 3.12 in the worker container; local test runs may use newer 3.x — keep deps version-flexible.
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- **New dependency allowed:** `yt-dlp` (this is the first plan that adds real source tooling). No other new deps.
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- The `SourceAdapter` protocol, `Candidate`/`Quality`/`DownloadResult`/`MBTarget` types, the ranker, confidence, and pipeline are UNCHANGED. The adapter only *implements* the protocol.
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- `Candidate.source_tier` is the single source of truth for ranking (set by the adapter / stamped by the pipeline). YouTube: `name="youtube"`, `tier=2`, quality is lossy (`Quality(fmt="OPUS", lossless=False, bitrate_kbps=160)`).
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- The real `YtDlpClient` is NOT unit-tested offline (it hits the network); it is covered by an OPT-IN live test skipped unless env `LYRA_LIVE_TESTS` is set. Never make normal CI/test runs depend on network.
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- `registry.build_adapters()` returns only REAL, usable adapters. After this plan that is `[YouTubeAdapter(YtDlpClient())]`; Qobuz/Soulseek are added by later plans. The fake adapters remain in `adapters/fakes.py` for pipeline tests only.
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- Every task ends with a commit.
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## Shared interfaces (defined by tasks below; listed for consistency)
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```python
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# worker/lyra_worker/adapters/youtube.py (Task 1)
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class YtClient(Protocol):
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def search_album(self, artist: str, album: str) -> list[dict]: ... # each: {source_ref, title, artist, track_count}
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def download(self, source_ref: str, dest: str, on_progress: Callable[[float], None]) -> dict: ... # {track_count, path}; raises on failure
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class YouTubeAdapter: # implements SourceAdapter
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name = "youtube"; tier = 2
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def __init__(self, client: YtClient): ...
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def health(self) -> bool: ...
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def search(self, target: MBTarget) -> list[Candidate]: ...
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def download(self, candidate: Candidate, dest: str, on_progress) -> DownloadResult: ...
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# worker/lyra_worker/adapters/_ytdlp.py (Task 2)
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class YtDlpClient: # real YtClient wrapping yt_dlp.YoutubeDL
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def search_album(self, artist, album) -> list[dict]: ...
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def download(self, source_ref, dest, on_progress) -> dict: ...
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```
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---
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### Task 1: YouTubeAdapter + client seam (offline, fake client)
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**Files:**
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- Create: `worker/lyra_worker/adapters/youtube.py`
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- Test: `worker/tests/test_youtube_adapter.py`
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**Interfaces:**
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- Consumes: `MBTarget`, `Candidate`, `Quality`, `DownloadResult` (types.py); `SourceAdapter` (adapters/base.py).
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- Produces: the `YtClient` Protocol and `YouTubeAdapter` (see Shared interfaces). `search` maps each client result dict to a `Candidate(source="youtube", source_ref, matched_artist=result["artist"], matched_album=result["title"], quality=lossy OPUS 160, track_count, source_tier=2)`. `download` calls `client.download`; on exception returns `DownloadResult(ok=False, error=str(e))`, else `DownloadResult(ok=True, path, track_count)`.
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- [ ] **Step 1: Write the failing test**
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`worker/tests/test_youtube_adapter.py`:
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```python
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from lyra_worker.adapters.youtube import YouTubeAdapter
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from lyra_worker.types import Candidate, MBTarget, Quality
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TARGET = MBTarget(artist="Radiohead", album="In Rainbows", track_count=10)
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class FakeYtClient:
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def __init__(self, results=None, fail=False):
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self._results = results if results is not None else [
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{"source_ref": "yt:playlist:abc", "title": "In Rainbows", "artist": "Radiohead", "track_count": 10}
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]
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self._fail = fail
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self.downloaded = []
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def search_album(self, artist, album):
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return self._results
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def download(self, source_ref, dest, on_progress):
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if self._fail:
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raise RuntimeError("network boom")
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on_progress(1.0)
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self.downloaded.append((source_ref, dest))
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return {"track_count": 10, "path": dest}
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def test_name_and_tier():
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a = YouTubeAdapter(FakeYtClient())
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assert a.name == "youtube"
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assert a.tier == 2
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assert a.health() is True
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def test_search_maps_results_to_candidates():
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cands = YouTubeAdapter(FakeYtClient()).search(TARGET)
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assert len(cands) == 1
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c = cands[0]
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assert c.source == "youtube"
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assert c.source_ref == "yt:playlist:abc"
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assert c.matched_artist == "Radiohead"
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assert c.matched_album == "In Rainbows"
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assert c.track_count == 10
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assert c.source_tier == 2
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assert c.quality.lossless is False
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def test_search_empty_when_no_results():
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assert YouTubeAdapter(FakeYtClient(results=[])).search(TARGET) == []
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def test_download_success():
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client = FakeYtClient()
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cand = YouTubeAdapter(client).search(TARGET)[0]
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seen = []
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result = YouTubeAdapter(client).download(cand, "/tmp/x", seen.append)
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assert result.ok is True
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assert result.track_count == 10
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assert seen and seen[-1] == 1.0
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def test_download_failure_returns_not_ok():
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client = FakeYtClient(fail=True)
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cand = YouTubeAdapter(FakeYtClient()).search(TARGET)[0]
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result = YouTubeAdapter(client).download(cand, "/tmp/x", lambda _p: None)
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assert result.ok is False
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assert result.error
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```
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- [ ] **Step 2: Run the test to verify it fails**
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Run:
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```bash
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cd worker
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worker/.venv/bin/python -m pytest tests/test_youtube_adapter.py -v
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```
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Expected: FAIL — `ModuleNotFoundError: No module named 'lyra_worker.adapters.youtube'`.
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- [ ] **Step 3: Implement the adapter**
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`worker/lyra_worker/adapters/youtube.py`:
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```python
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from typing import Callable, Protocol
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from lyra_worker.types import Candidate, DownloadResult, MBTarget, Quality
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_YT_QUALITY = Quality(fmt="OPUS", lossless=False, bitrate_kbps=160)
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class YtClient(Protocol):
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def search_album(self, artist: str, album: str) -> list[dict]:
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"""Return album matches: dicts with keys source_ref, title, artist, track_count."""
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...
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def download(self, source_ref: str, dest: str, on_progress: Callable[[float], None]) -> dict:
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"""Download into dest; return {track_count, path}. Raise on failure."""
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...
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class YouTubeAdapter:
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name = "youtube"
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tier = 2
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def __init__(self, client: YtClient):
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self._client = client
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def health(self) -> bool:
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return True
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def search(self, target: MBTarget) -> list[Candidate]:
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candidates: list[Candidate] = []
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for r in self._client.search_album(target.artist, target.album):
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candidates.append(
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Candidate(
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source="youtube",
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source_ref=r["source_ref"],
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matched_artist=r.get("artist", ""),
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matched_album=r.get("title", ""),
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quality=_YT_QUALITY,
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track_count=r.get("track_count", 1) or 1,
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source_tier=self.tier,
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)
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)
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return candidates
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def download(
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self, candidate: Candidate, dest: str, on_progress: Callable[[float], None]
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) -> DownloadResult:
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try:
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info = self._client.download(candidate.source_ref, dest, on_progress)
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except Exception as e: # network/extraction failures -> fall-through in the pipeline
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return DownloadResult(ok=False, error=str(e))
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return DownloadResult(
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ok=True,
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path=info.get("path", dest),
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track_count=info.get("track_count", candidate.track_count),
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)
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```
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- [ ] **Step 4: Run the test to verify it passes**
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Run:
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```bash
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cd worker
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worker/.venv/bin/python -m pytest tests/test_youtube_adapter.py -v
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```
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Expected: PASS — all five tests green.
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- [ ] **Step 5: Commit**
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```bash
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git add worker/lyra_worker/adapters/youtube.py worker/tests/test_youtube_adapter.py
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git commit -m "feat: add YouTubeAdapter with injectable client seam"
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```
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---
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### Task 2: Real YtDlpClient + yt-dlp dependency + ffmpeg + opt-in live test
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**Files:**
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- Create: `worker/lyra_worker/adapters/_ytdlp.py`
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- Create: `worker/tests/test_youtube_live.py`
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- Modify: `worker/requirements.txt`
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- Modify: `worker/Dockerfile`
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**Interfaces:**
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- Consumes: `yt_dlp`.
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- Produces: `YtDlpClient` implementing the `YtClient` seam using `yt_dlp.YoutubeDL`. `search_album` runs a `ytsearch5:` query and maps entries; `download` fetches bestaudio into `dest` with a progress hook and `FFmpegExtractAudio`.
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- [ ] **Step 1: Add the dependency and ffmpeg**
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Append to `worker/requirements.txt`:
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```
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yt-dlp>=2024.1
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```
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Install into the venv: `worker/.venv/bin/pip install -r worker/requirements.txt`
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In `worker/Dockerfile`, add `ffmpeg` to the image (yt-dlp needs it for audio extraction). Change the first lines from:
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```dockerfile
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FROM python:3.12-slim
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WORKDIR /app
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COPY requirements.txt .
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RUN pip install --no-cache-dir -r requirements.txt
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```
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to:
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```dockerfile
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FROM python:3.12-slim
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WORKDIR /app
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RUN apt-get update && apt-get install -y --no-install-recommends ffmpeg && rm -rf /var/lib/apt/lists/*
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COPY requirements.txt .
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RUN pip install --no-cache-dir -r requirements.txt
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```
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- [ ] **Step 2: Implement the real client**
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`worker/lyra_worker/adapters/_ytdlp.py`:
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```python
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import os
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from typing import Callable
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import yt_dlp
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class YtDlpClient:
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"""Real YtClient backed by yt_dlp. Not unit-tested offline; see test_youtube_live.py."""
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def search_album(self, artist: str, album: str) -> list[dict]:
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query = f"ytsearch5:{artist} {album} full album"
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opts = {
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"quiet": True,
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"no_warnings": True,
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"extract_flat": "in_playlist",
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"skip_download": True,
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}
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with yt_dlp.YoutubeDL(opts) as ydl:
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info = ydl.extract_info(query, download=False)
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results: list[dict] = []
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for e in (info.get("entries") or []):
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if not e:
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continue
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results.append(
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{
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"source_ref": e.get("url") or e.get("webpage_url") or e.get("id"),
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"title": e.get("title") or "",
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"artist": e.get("uploader") or e.get("channel") or "",
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"track_count": e.get("playlist_count") or 1,
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}
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)
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return results
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def download(self, source_ref: str, dest: str, on_progress: Callable[[float], None]) -> dict:
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os.makedirs(dest, exist_ok=True)
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def hook(d: dict) -> None:
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if d.get("status") == "downloading":
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total = d.get("total_bytes") or d.get("total_bytes_estimate")
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if total:
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on_progress(min(1.0, d.get("downloaded_bytes", 0) / total))
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elif d.get("status") == "finished":
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on_progress(1.0)
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opts = {
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"quiet": True,
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"no_warnings": True,
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"format": "bestaudio/best",
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"outtmpl": os.path.join(dest, "%(playlist_index)s-%(title)s.%(ext)s"),
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"progress_hooks": [hook],
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"postprocessors": [{"key": "FFmpegExtractAudio", "preferredcodec": "opus"}],
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}
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with yt_dlp.YoutubeDL(opts) as ydl:
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info = ydl.extract_info(source_ref, download=True)
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entries = info.get("entries") if info.get("entries") is not None else [info]
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return {"track_count": len([e for e in entries if e]), "path": dest}
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```
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- [ ] **Step 3: Write the opt-in live test**
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`worker/tests/test_youtube_live.py`:
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```python
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import os
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import pytest
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from lyra_worker.adapters._ytdlp import YtDlpClient
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pytestmark = pytest.mark.skipif(
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not os.environ.get("LYRA_LIVE_TESTS"),
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reason="live network test; set LYRA_LIVE_TESTS=1 to run",
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)
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def test_live_search_returns_results():
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results = YtDlpClient().search_album("Radiohead", "In Rainbows")
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assert len(results) >= 1
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assert all(r["source_ref"] for r in results)
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```
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- [ ] **Step 4: Verify (offline) the module imports and the live test is skipped**
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Run:
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```bash
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cd worker
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worker/.venv/bin/python -c "from lyra_worker.adapters._ytdlp import YtDlpClient; print('import ok')"
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worker/.venv/bin/python -m pytest tests/test_youtube_live.py -v
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```
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Expected: prints `import ok`; the live test is reported **skipped** (LYRA_LIVE_TESTS not set). Do NOT set LYRA_LIVE_TESTS here — the live test is for the user to run on their network.
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- [ ] **Step 5: Commit**
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```bash
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git add worker/lyra_worker/adapters/_ytdlp.py worker/tests/test_youtube_live.py worker/requirements.txt worker/Dockerfile
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git commit -m "feat: add real yt-dlp client and opt-in live test; ffmpeg in worker image"
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```
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---
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### Task 3: Wire the real YouTube adapter into the registry
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**Files:**
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- Modify: `worker/lyra_worker/registry.py`
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- Modify: `worker/tests/test_registry.py`
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**Interfaces:**
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- Consumes: `YouTubeAdapter` (Task 1), `YtDlpClient` (Task 2).
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- Produces: `build_adapters()` returns `[YouTubeAdapter(YtDlpClient())]` — the real, usable adapters. (Qobuz/Soulseek added by later plans.)
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- [ ] **Step 1: Update the registry test (write the new expectation first)**
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Replace `worker/tests/test_registry.py` with:
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```python
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from lyra_worker.adapters.youtube import YouTubeAdapter
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from lyra_worker.registry import build_adapters
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def test_registry_returns_real_youtube_adapter():
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adapters = build_adapters()
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names = [a.name for a in adapters]
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assert "youtube" in names
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yt = next(a for a in adapters if a.name == "youtube")
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assert isinstance(yt, YouTubeAdapter)
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assert yt.tier == 2
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assert yt.health() is True
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def test_registry_adapter_names_are_unique():
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names = [a.name for a in build_adapters()]
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assert len(names) == len(set(names))
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```
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- [ ] **Step 2: Run the test to verify it fails**
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Run:
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```bash
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cd worker
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worker/.venv/bin/python -m pytest tests/test_registry.py -v
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```
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Expected: FAIL — the old `build_adapters` returns the three fakes, so `isinstance(yt, YouTubeAdapter)` fails (the youtube entry is a `FakeYouTube`).
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- [ ] **Step 3: Update the registry**
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Replace `worker/lyra_worker/registry.py` with:
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```python
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from lyra_worker.adapters._ytdlp import YtDlpClient
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from lyra_worker.adapters.base import SourceAdapter
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from lyra_worker.adapters.youtube import YouTubeAdapter
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def build_adapters() -> list[SourceAdapter]:
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"""The enabled real source adapters, best-tier first.
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Only real, usable adapters are returned. Plan 3c/3d add Qobuz (streamrip)
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and Soulseek (slskd), each gated on its config being present via health().
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"""
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return [YouTubeAdapter(YtDlpClient())]
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```
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||||
- [ ] **Step 4: Run the test to verify it passes**
|
||||
|
||||
Run:
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```bash
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cd worker
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||||
worker/.venv/bin/python -m pytest tests/test_registry.py -v
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||||
```
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||||
Expected: PASS — both tests green.
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||||
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||||
- [ ] **Step 5: Commit**
|
||||
|
||||
```bash
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||||
git add worker/lyra_worker/registry.py worker/tests/test_registry.py
|
||||
git commit -m "feat: wire real YouTube adapter into the registry"
|
||||
```
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||||
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||||
---
|
||||
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||||
### Task 4: Pipeline integration with the real adapter class
|
||||
|
||||
**Files:**
|
||||
- Test: `worker/tests/test_youtube_pipeline.py`
|
||||
|
||||
**Interfaces:**
|
||||
- Consumes: `run_pipeline` (pipeline.py), `YouTubeAdapter` (Task 1), the `conn` fixture + `insert_request`.
|
||||
- Produces: proof that the REAL `YouTubeAdapter` class (driven by a fake yt-dlp client, so offline) flows through the full pipeline to `imported`, writing a `LibraryItem` and a chosen `Candidate` with `source="youtube"`.
|
||||
|
||||
- [ ] **Step 1: Write the failing test**
|
||||
|
||||
`worker/tests/test_youtube_pipeline.py`:
|
||||
```python
|
||||
from lyra_worker.adapters.youtube import YouTubeAdapter
|
||||
from lyra_worker.claim import claim_next
|
||||
from lyra_worker.pipeline import run_pipeline
|
||||
from tests.conftest import insert_request
|
||||
from tests.test_youtube_adapter import FakeYtClient
|
||||
|
||||
|
||||
def test_youtube_adapter_flows_through_pipeline(conn):
|
||||
job_id = insert_request(conn, artist="Radiohead", album="In Rainbows")
|
||||
claim_next(conn)
|
||||
run_pipeline(conn, job_id, [YouTubeAdapter(FakeYtClient())], dest_root="/tmp/lib")
|
||||
|
||||
with conn.cursor() as cur:
|
||||
cur.execute('SELECT state, "currentStage" FROM "Job" WHERE id = %s', (job_id,))
|
||||
assert cur.fetchone() == ("imported", "import")
|
||||
cur.execute('SELECT source FROM "Candidate" WHERE "jobId" = %s AND chosen = true', (job_id,))
|
||||
assert cur.fetchone()[0] == "youtube"
|
||||
cur.execute('SELECT source FROM "LibraryItem" WHERE artist = %s', ("Radiohead",))
|
||||
assert cur.fetchone()[0] == "youtube"
|
||||
```
|
||||
|
||||
- [ ] **Step 2: Run the test to verify it fails, then passes**
|
||||
|
||||
Run:
|
||||
```bash
|
||||
cd worker
|
||||
export DATABASE_URL=postgresql://lyra:lyra@localhost:5432/lyra
|
||||
worker/.venv/bin/python -m pytest tests/test_youtube_pipeline.py -v
|
||||
```
|
||||
Expected: This test should PASS immediately — it exercises already-implemented code (the adapter from Task 1 + the existing pipeline) with no new production code. If it FAILS, investigate a real integration mismatch (e.g. the FakeYtClient's default result must score above the confidence gate against "Radiohead"/"In Rainbows" — it does, since title/artist match exactly). This task is a characterization/integration test; no implementation step is expected.
|
||||
|
||||
- [ ] **Step 3: Run the full worker suite**
|
||||
|
||||
Run:
|
||||
```bash
|
||||
cd worker
|
||||
export DATABASE_URL=postgresql://lyra:lyra@localhost:5432/lyra
|
||||
worker/.venv/bin/python -m pytest -v
|
||||
```
|
||||
Expected: PASS — every suite green (youtube adapter, youtube pipeline, registry, config, crypto, pipeline, ranker, etc.), the live test skipped, output pristine.
|
||||
|
||||
- [ ] **Step 4: Commit**
|
||||
|
||||
```bash
|
||||
git add worker/tests/test_youtube_pipeline.py
|
||||
git commit -m "test: verify real YouTubeAdapter flows through the pipeline"
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Notes for the next plans
|
||||
|
||||
`registry.build_adapters()` now returns the real YouTube adapter. Plan 3c adds `QobuzAdapter` (streamrip) and Plan 3d adds `SoulseekAdapter` (slskd REST client + an slskd service in docker-compose), each reading credentials via `get_config(conn)` and included in `build_adapters()` only when configured (checked through `health()`). The `YtClient`/injected-client pattern established here (real client separate from the adapter, fake client for offline tests, opt-in live test) is the template for both. Plan 4 then adds real MusicBrainz resolution in `intake` (filling `MBTarget.track_count`/`total_duration_s`, which will make the confidence gate and YouTube's `track_count` reporting meaningfully stricter) and real tagging/file-move in `tag`/`import`.
|
||||
Reference in New Issue
Block a user