api/src/api/v1/websocket.py

@@ -365,13 +365,71 @@ class ConnectionManager:
             self.cell_locks.pop(lock_key, None)
 
 
+# AURORA-1845: срок жизни кэша пользователя/доступа к форме внутри одного
+# WebSocket-соединения. Ограничивает устаревание (смена роли/орг-юнитов,
+# удаление формы) при живом соединении; источник истины по правам -
+# can_edit в SQL-обёртках, он проверяется на каждое сообщение.
+CONNECTION_CACHE_TTL_SECONDS = 30.0
+
+
+class ConnectionCache:
+    """Кэш на время соединения: пользователь и факт доступа к форме.
+
+    Хранится вне процессора (процессор создаётся на каждое сообщение вместе
+    с новой сессией БД). Кэшируются только положительные результаты.
+    """
+
+    def __init__(self, ttl: float = CONNECTION_CACHE_TTL_SECONDS, clock=time.monotonic):
+        self.ttl = ttl
+        self._clock = clock
+        self._user: tuple[float, AppUser] | None = None
+        self._forms: dict[int, float] = {}
+
+    def get_user(self, user_id: int) -> AppUser | None:
+        if self._user is None:
+            return None
+        ts, user = self._user
+        if user.id != user_id or self._clock() - ts >= self.ttl:
+            self._user = None
+            return None
+        return user
+
+    def set_user(self, user: AppUser | None) -> None:
+        if user is not None:
+            self._user = (self._clock(), user)
+
+    def form_access_ok(self, form_id: int) -> bool:
+        ts = self._forms.get(form_id)
+        if ts is None:
+            return False
+        if self._clock() - ts >= self.ttl:
+            self._forms.pop(form_id, None)
+            return False
+        return True
+
+    def set_form_access(self, form_id: int) -> None:
+        self._forms[form_id] = self._clock()
+
+
 class FormEventProcess:
     def __init__(self, db: AsyncSession):
         self.sheet_service: SheetService = SheetService(db)
         self.bf_service: BudgetFormService = BudgetFormService(db)
         self.bl_service: BudgetLineService = BudgetLineService(db)
         self.user_service: UserService = UserService(db)
+        self._cache: ConnectionCache | None = None
 
+    async def _check_form_access(self, form_id: int, user: AppUser) -> bool:
+        """Доступ пользователя к форме; положительный результат кэшируется."""
+        cache = self._cache
+        if cache and cache.form_access_ok(form_id):
+            return True
+        form = await self.bf_service.get(budget_form_id=form_id, user=user)
+        if not form:
+            return False
+        if cache:
+            cache.set_form_access(form_id)
+        return True
 
     async def process(
         self,
@@ -380,8 +438,14 @@ class FormEventProcess:
         user_id: int,
         sheet: str,
         direction: str | None = None,
+        cache: ConnectionCache | None = None,
     ) -> int | bool | dict:
-        curr_user: AppUser = await self.user_service.get(user_id)
+        self._cache = cache
+        curr_user: AppUser | None = cache.get_user(user_id) if cache else None
+        if curr_user is None:
+            curr_user = await self.user_service.get(user_id)
+            if cache:
+                cache.set_user(curr_user)
 
         match event_data["event"]:
             case "cell_updated":
@@ -458,8 +522,7 @@ class FormEventProcess:
             "value": any,
         }
         """
-        form = await self.bf_service.get(budget_form_id=form_id, user=user)
+        if not await self._check_form_access(form_id=form_id, user=user):
-        if not form:
             return None
 
         return await self.sheet_service.update_cell(
@@ -495,8 +558,7 @@ class FormEventProcess:
                 contract_end_date: Optional[datetime] = None
             }
         """
-        form = await self.bf_service.get(budget_form_id=form_id, user=user)
+        if not await self._check_form_access(form_id=form_id, user=user):
-        if not form:
             return None
 
         ids = await self.bl_service.get_ids(budget_form_id=form_id)
@@ -617,8 +679,7 @@ class FormEventProcess:
                 "row_id": int,
             }
         """
-        form = await self.bf_service.get(budget_form_id=form_id, user=user)
+        if not await self._check_form_access(form_id=form_id, user=user):
-        if not form:
             return None
         result = await self.sheet_service.delete_line(
             form_id=form_id,
@@ -970,6 +1031,8 @@ async def process_websocket(
             )
             return
 
+        conn_cache = ConnectionCache()
+
         while True:
             data = loads(await websocket.receive_text())
 
@@ -1068,10 +1131,13 @@ async def process_websocket(
                     processor = processor_cls(db)
                     t0 = time.perf_counter()
                     data_old = data.copy()
+                    process_kwargs = dict(kwargs_process)
+                    if processor_cls is FormEventProcess:
+                        process_kwargs["cache"] = conn_cache
                     data["result"] = await processor.process(
                         event_data=data,
                         user_id=user_id,
-                        **kwargs_process
+                        **process_kwargs
                     )
                     should_refresh_ahr = (
                         con_key == ConnectionKeyEnum.FORM

api/tests/integration/test_websocket_connection_cache_integration.py

@@ -0,0 +1,49 @@
+"""AURORA-1845: WebSocket листа формы читает user/форму один раз на соединение."""
+from src.services.budget_form_service import BudgetFormService
+from src.services.user_service import UserService
+
+WS_URL = "/api/v1/ws/form/1/sheet/AHR?direction=Support"
+CELL = {"line_id": 1, "column": "plan.q1"}
+
+
+def _roundtrip(ws, event: str, data: dict) -> dict:
+    ws.send_json({"event": event, "data": data})
+    return ws.receive_json()
+
+
+def test_ws_reads_user_and_form_once_per_connection(client, admin_tokens, monkeypatch):
+    calls = {"user": 0, "form": 0}
+    orig_user_get = UserService.get
+    orig_form_get = BudgetFormService.get
+
+    async def user_get(self, *a, **kw):
+        calls["user"] += 1
+        return await orig_user_get(self, *a, **kw)
+
+    async def form_get(self, *a, **kw):
+        calls["form"] += 1
+        return await orig_form_get(self, *a, **kw)
+
+    monkeypatch.setattr(UserService, "get", user_get)
+    monkeypatch.setattr(BudgetFormService, "get", form_get)
+
+    n = 3
+    with client.websocket_connect(WS_URL) as ws:
+        ws.send_json({"event": "user_login", "data": {"token": admin_tokens["access_token"]}})
+        try:
+            for i in range(n):
+                started = _roundtrip(ws, "cell_edit_start", CELL)
+                assert not started.get("error")
+                updated = _roundtrip(ws, "cell_updated", {**CELL, "value": 100 + i})
+                assert not updated.get("error"), updated
+                _roundtrip(ws, "cell_edit_end", CELL)
+            # Только счётчики до отката: откат ниже идёт тем же соединением.
+            user_calls, form_calls = calls["user"], calls["form"]
+        finally:
+            # WS коммитит: возвращаем исходное значение (в фикстуре plan.q1 = NULL).
+            _roundtrip(ws, "cell_edit_start", CELL)
+            _roundtrip(ws, "cell_updated", {**CELL, "value": None})
+            _roundtrip(ws, "cell_edit_end", CELL)
+
+    assert user_calls == 1
+    assert form_calls == 1

api/tests/unit/test_websocket_connection_cache.py

@@ -0,0 +1,74 @@
+"""AURORA-1845: user/форма читаются из БД один раз на соединение, а не на каждое сообщение."""
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from src.api.v1.websocket import ConnectionCache, FormEventProcess
+
+
+def _processor(user=None, form=object()):
+    proc = FormEventProcess(MagicMock())
+    proc.user_service = MagicMock(get=AsyncMock(return_value=user or SimpleNamespace(id=7, role_id=2)))
+    proc.bf_service = MagicMock(get=AsyncMock(return_value=form))
+    proc.sheet_service = MagicMock(update_cell=AsyncMock(return_value=[]))
+    return proc
+
+
+EVENT = {"event": "cell_updated", "data": {"line_id": 1, "column": "c", "value": 1}}
+
+
+async def _send(proc, cache, n):
+    for _ in range(n):
+        await proc.process(event_data=EVENT, form_id=5, user_id=7, sheet="S", cache=cache)
+
+
+@pytest.mark.asyncio
+async def test_cache_reads_user_and_form_once_per_connection():
+    proc = _processor()
+    cache = ConnectionCache()
+    await _send(proc, cache, 5)
+    assert proc.user_service.get.await_count == 1
+    assert proc.bf_service.get.await_count == 1
+    assert proc.sheet_service.update_cell.await_count == 5
+
+
+@pytest.mark.asyncio
+async def test_without_cache_reads_every_message():
+    proc = _processor()
+    await _send(proc, None, 3)
+    assert proc.user_service.get.await_count == 3
+    assert proc.bf_service.get.await_count == 3
+
+
+@pytest.mark.asyncio
+async def test_cache_expires_after_ttl():
+    now = [0.0]
+    cache = ConnectionCache(ttl=30, clock=lambda: now[0])
+    proc = _processor()
+    await _send(proc, cache, 2)
+    now[0] = 31
+    await _send(proc, cache, 2)
+    assert proc.user_service.get.await_count == 2
+    assert proc.bf_service.get.await_count == 2
+
+
+@pytest.mark.asyncio
+async def test_missing_form_is_not_cached():
+    proc = _processor(form=None)
+    cache = ConnectionCache()
+    for _ in range(3):
+        res = await proc.process(event_data=EVENT, form_id=5, user_id=7, sheet="S", cache=cache)
+        assert res is None
+    assert proc.bf_service.get.await_count == 3
+    proc.sheet_service.update_cell.assert_not_awaited()
+
+
+@pytest.mark.asyncio
+async def test_missing_user_is_not_cached():
+    proc = _processor()
+    proc.user_service.get = AsyncMock(return_value=None)
+    cache = ConnectionCache()
+    assert cache.get_user(7) is None
+    cache.set_user(None)
+    assert cache.get_user(7) is None