feat(products): streamed export service + TEL-3 + EmptyCatalog (PUC-9, §9.1)

backend/tests/test_products_export.py

@@ -8,7 +8,7 @@ import psycopg
 import pytest
 
 from app.domains import products
-from app.domains.products import repo, serialize
+from app.domains.products import repo
 from app.platform import db
 
 CSV = (
@@ -54,3 +54,47 @@ def test_export_status_filter(migrated_conn, merchant):
     assert [p.handle for p in active] == ["active-mug"]
     draft = repo.export_catalog(migrated_conn, merchant["storefront_id"], "draft")
     assert [p.handle for p in draft] == ["draft-tee"]
+
+
+@pytest.fixture()
+def telemetry_propagation():
+    """create_app() sets propagate=False on the parent "ecomm" logger
+    (main._ensure_app_logging), which hides ecomm.telemetry records from caplog's
+    root-logger handler whenever an API test ran first. Restore propagation here."""
+    lg = logging.getLogger("ecomm")
+    prior = lg.propagate
+    lg.propagate = True
+    yield
+    lg.propagate = prior
+
+
+def test_export_streams_canonical_csv(migrated_conn, merchant):
+    _seed(migrated_conn, merchant)
+    text = "".join(products.export_catalog(migrated_conn, merchant["storefront_id"], "all"))
+    rows = list(csv.DictReader(io.StringIO(text)))
+    assert {r["Handle"] for r in rows} == {"active-mug", "draft-tee"}
+    assert rows[0]["Handle"] == "active-mug"  # sorted by handle
+
+
+def test_export_empty_raises(migrated_conn, merchant):
+    # No catalog at all → empty.
+    with pytest.raises(products.EmptyCatalog):
+        list(products.export_catalog(migrated_conn, merchant["storefront_id"], "all"))
+
+
+def test_export_empty_after_filter_raises(migrated_conn, merchant):
+    _seed(migrated_conn, merchant)  # only active + draft exist
+    with pytest.raises(products.EmptyCatalog):
+        list(products.export_catalog(migrated_conn, merchant["storefront_id"], "archived"))
+
+
+def test_tel3_emitted(migrated_conn, merchant, caplog, telemetry_propagation):
+    _seed(migrated_conn, merchant)
+    with caplog.at_level(logging.INFO, logger="ecomm.telemetry"):
+        list(products.export_catalog(migrated_conn, merchant["storefront_id"], "all"))
+    events = [json.loads(r.message) for r in caplog.records if r.name == "ecomm.telemetry"]
+    exported = [e for e in events if e["event"] == "catalog_exported"]
+    assert len(exported) == 1
+    assert exported[0]["product_count"] == 2
+    assert exported[0]["status_filter"] == "all"
+    assert "duration_ms" in exported[0]