fix(HEL-482): 开盘前分时回退最近交易日，并接通中枢失败回旧通道

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

xiaobai-datahub/tests/test_realtime_intraday.py

@@ -0,0 +1,102 @@
+from __future__ import annotations
+
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from datahub.adapters.base import AdapterError
+from datahub.adapters.eastmoney import HIS_TRENDS_URL, TRENDS_URL, EastmoneyAdapter
+from datahub.db import HubDB
+from datahub.realtime_serve import fetch_intraday
+
+
+class FakeEastmoney(EastmoneyAdapter):
+    def __init__(self) -> None:
+        super().__init__(timeout=2)
+        self.urls: list[str] = []
+
+    def _get_json(self, url, params, referer):
+        self.urls.append(f"{url}|{params.get('ndays')}")
+        if url == TRENDS_URL:
+            return {"data": {"name": "中国平安", "code": "601318", "preClose": 56.36, "trends": []}}
+        if url == HIS_TRENDS_URL:
+            return {
+                "data": {
+                    "name": "中国平安",
+                    "code": "601318",
+                    "preClose": 55.8,
+                    "trends": [
+                        "2026-09-07 09:30,55.80,55.90,56.00,55.70,100,5580.00,55.900",
+                        "2026-09-07 15:00,56.10,56.20,56.30,56.00,200,11240.00,56.150",
+                        "2026-09-08 09:30,0,0,0,0,0,0.00,0",
+                    ],
+                }
+            }
+        raise AdapterError(f"unexpected url {url}")
+
+
+class EastmoneyIntradayLookbackTests(unittest.TestCase):
+    def test_empty_today_uses_latest_available_session(self):
+        adapter = FakeEastmoney()
+        payload = adapter.fetch_intraday("601318.SH")
+        self.assertEqual(adapter.urls, [f"{TRENDS_URL}|1", f"{TRENDS_URL}|5", f"{HIS_TRENDS_URL}|5"])
+        self.assertEqual(payload["trade_date"], "2026-09-07")
+        self.assertEqual([point["time"] for point in payload["points"]], ["09:30", "15:00"])
+        self.assertEqual(payload["points"][0]["close"], 55.9)
+
+    def test_preferred_date_keeps_that_session(self):
+        adapter = FakeEastmoney()
+        payload = adapter.fetch_intraday("601318.SH", "20260907")
+        self.assertEqual(payload["trade_date"], "2026-09-07")
+        self.assertEqual(len(payload["points"]), 2)
+
+
+class IntradayLkgTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.tmp = tempfile.TemporaryDirectory()
+        self.db = HubDB(Path(self.tmp.name) / "hub.db")
+
+    def tearDown(self) -> None:
+        self.tmp.cleanup()
+
+    def test_source_failure_returns_last_known_good(self):
+        from datahub.realtime_serve import _envelope, _write_cache
+
+        payload = _envelope(
+            {
+                "entity_type": "stock",
+                "ts_code": "601318.SH",
+                "trade_date": "2026-09-07",
+                "previous_close": 55.8,
+                "points": [{"date": "2026-09-07", "time": "09:30", "close": 55.9}],
+            },
+            {
+                "tier": "provisional",
+                "trade_date": "20260907",
+                "source": "eastmoney:trends2",
+                "stale": False,
+            },
+        )
+        _write_cache(self.db, "intraday:601318.SH:today", payload, 20, "eastmoney:trends2")
+        self.db.execute(
+            "UPDATE rt_cache SET expires_at = ? WHERE cache_key = ?",
+            ("2000-01-01T00:00:00+08:00", "intraday:601318.SH:today"),
+        )
+
+        with patch("datahub.realtime_serve.EastmoneyAdapter") as mocked:
+            mocked.return_value.fetch_intraday.side_effect = AdapterError("down")
+            recovered = fetch_intraday(self.db, "601318.SH")
+        self.assertTrue(recovered["meta"]["stale"])
+        self.assertEqual(recovered["data"]["points"][0]["close"], 55.9)
+
+    def test_source_failure_without_lkg_raises(self):
+        with patch("datahub.realtime_serve.EastmoneyAdapter") as mocked:
+            mocked.return_value.fetch_intraday.side_effect = AdapterError("down")
+            with self.assertRaises(Exception) as ctx:
+                fetch_intraday(self.db, "000001.SZ")
+        self.assertIn("intraday unavailable", str(ctx.exception))
+
+
+if __name__ == "__main__":
+    unittest.main()