feat(music-lab): orchestrator step 자동 재시도 (publish 제외)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

music-lab/tests/test_pipeline_retry.py

@@ -1,5 +1,6 @@
 import pytest
 from app import db
+from app.pipeline import orchestrator
 
 
 @pytest.fixture
@@ -10,6 +11,11 @@ def fresh_db(monkeypatch, tmp_path):
     return db_path
 
 
+@pytest.fixture(autouse=True)
+def _no_backoff(monkeypatch):
+    monkeypatch.setattr(orchestrator, "STEP_RETRY_BACKOFF_SEC", [0, 0])
+
+
 def test_get_last_failed_step_returns_step(fresh_db):
     pid = db.create_pipeline(track_id=1)
     job_id = db.create_pipeline_job(pid, "video")
@@ -22,3 +28,56 @@ def test_get_last_failed_step_none_when_no_failure(fresh_db):
     pid = db.create_pipeline(track_id=1)
     db.create_pipeline_job(pid, "cover")
     assert db.get_last_failed_step(pid) is None
+
+
+async def test_retryable_step_retries_then_succeeds(fresh_db, monkeypatch):
+    pid = db.create_pipeline(track_id=1)
+    calls = {"n": 0}
+
+    async def flaky(step, p, ctx, feedback):
+        calls["n"] += 1
+        if calls["n"] < 3:
+            raise RuntimeError("transient")
+        return {"next_state": "video_pending", "fields": {}}
+
+    monkeypatch.setattr(orchestrator, "_dispatch_step", flaky)
+    monkeypatch.setattr(
+        orchestrator, "_resolve_input",
+        lambda p: {"genre": "x", "title": "t", "moods": [], "tracks": [], "audio_path": "", "duration_sec": 0},
+    )
+    await orchestrator.run_step(pid, "cover")
+    assert calls["n"] == 3
+    assert db.get_pipeline(pid)["state"] == "video_pending"
+
+
+async def test_retryable_step_exhausts_to_failed(fresh_db, monkeypatch):
+    pid = db.create_pipeline(track_id=1)
+
+    async def always_fail(step, p, ctx, feedback):
+        raise RuntimeError("permanent")
+
+    monkeypatch.setattr(orchestrator, "_dispatch_step", always_fail)
+    monkeypatch.setattr(
+        orchestrator, "_resolve_input",
+        lambda p: {"genre": "x", "title": "t", "moods": [], "tracks": [], "audio_path": "", "duration_sec": 0},
+    )
+    await orchestrator.run_step(pid, "cover")
+    assert db.get_pipeline(pid)["state"] == "failed"
+
+
+async def test_publish_not_retried(fresh_db, monkeypatch):
+    pid = db.create_pipeline(track_id=1)
+    calls = {"n": 0}
+
+    async def fail_publish(step, p, ctx, feedback):
+        calls["n"] += 1
+        raise RuntimeError("upload error")
+
+    monkeypatch.setattr(orchestrator, "_dispatch_step", fail_publish)
+    monkeypatch.setattr(
+        orchestrator, "_resolve_input",
+        lambda p: {"genre": "x", "title": "t", "moods": [], "tracks": [], "audio_path": "", "duration_sec": 0},
+    )
+    await orchestrator.run_step(pid, "publish")
+    assert calls["n"] == 1
+    assert db.get_pipeline(pid)["state"] == "failed"