Persist matches finished by deadline timeouts

The deadline consumer runs in a long-lived task outside any request, so
a timeout that ended the match raised 'No TortoiseContext is currently
active' in save_match_result before the state was saved: the game stayed
stuck on the last turn and the entry retried forever. It only surfaced
on the match-deciding turn; ordinary timeouts and human plays were fine.

Bind the Tortoise context before persisting a finished match (optional
context_binder wired to TortoiseMixin.ensure_context), and back off to
the heartbeat when a due entry fails instead of hot-looping on it.

server/packages/tavolo-platform/src/tavolo/platform/deadlines.py

@@ -31,7 +31,7 @@ import json
 import time
 from datetime import datetime, timezone
 from logging import getLogger
-from typing import Any, Dict, Optional
+from typing import Any, Awaitable, Callable, Dict, Optional
 
 from kaya.core import KayaApp, KayaMixin
 
@@ -67,6 +67,12 @@ class DeadlineScheduler:
     Holds the store and the registry so a single instance serves every
     game type. One consumer task (and its wake-up event) is kept per
     event loop — tests run each test on a fresh loop.
+
+    ``context_binder`` is an optional async callable the consumer awaits
+    before persisting a finished match. The consumer is a long-lived task
+    of its own, outside any request, so it must bind whatever ambient
+    context the database layer needs (see
+    :meth:`~tavolo.platform.tortoise_mixin.TortoiseMixin.ensure_context`).
     """
 
     def __init__(
@@ -74,10 +80,12 @@ class DeadlineScheduler:
         store: GameStore,
         registry: GameRegistry,
         heartbeat_ms: int = 1000,
+        context_binder: Optional[Callable[[], Awaitable[None]]] = None,
     ) -> None:
         self._store = store
         self._registry = registry
         self._heartbeat = heartbeat_ms / 1000
+        self._context_binder = context_binder
         self._consumers: Dict[asyncio.AbstractEventLoop, asyncio.Task] = {}
         self._wake_events: Dict[asyncio.AbstractEventLoop, asyncio.Event] = {}
 
@@ -117,6 +125,10 @@ class DeadlineScheduler:
         if engine.is_finished(session):
             if session.finished_at is None:
                 session.finished_at = datetime.now(timezone.utc)
+            # A deadline can finish the match in the consumer task, which
+            # has no request context: bind the database context first.
+            if self._context_binder is not None:
+                await self._context_binder()
             await save_match_result(session, engine)
             log.info("game %s (%s) finished", session.id, session.game_type)
         await self._store.save(session)
@@ -196,6 +208,7 @@ class DeadlineScheduler:
             # Clear before polling so an enqueue racing the poll re-wakes us.
             wake.clear()
             delay = self._heartbeat
+            failed = False
             try:
                 for member in await self._store.due_deadlines(time.time()):
                     try:
@@ -205,6 +218,7 @@ class DeadlineScheduler:
                     except Exception:
                         # Left in the queue; retried on the next pass.
                         log.exception("deadline consumer: failed to process %r", member)
+                        failed = True
                 next_due = await self._store.next_deadline()
                 if next_due is not None:
                     delay = max(0.0, min(self._heartbeat, next_due - time.time()))
@@ -212,6 +226,11 @@ class DeadlineScheduler:
                 raise
             except Exception:
                 log.exception("deadline consumer: poll failed; retrying")
+                failed = True
+            if failed:
+                # A failed entry is still due: back off to the heartbeat
+                # instead of polling it again immediately.
+                delay = self._heartbeat
             try:
                 await asyncio.wait_for(wake.wait(), timeout=delay)
             except asyncio.TimeoutError:

server/packages/tavolo-platform/src/tavolo/platform/tortoise_mixin.py

@@ -19,6 +19,9 @@ This mixin therefore:
    (``before_websocket`` hook), because the match-result write happens at
    the end of a WebSocket match. The long-lived connection task keeps the
    context for its whole lifetime.
+4. Exposes :meth:`ensure_context` for background work that belongs to no
+   request: the deadline scheduler calls it before persisting a match that
+   a timeout finished, binding the context to its own long-lived task.
 
 It deliberately avoids the global-fallback singleton
 (``_enable_global_fallback``), which Tortoise only allows to be set once
@@ -115,6 +118,17 @@ class TortoiseMixin(KayaMixin):
                 log.info("sqlite schemas generated")
         return ctx
 
+    async def ensure_context(self) -> None:
+        """Bind this mixin's context to the calling task.
+
+        Background work with no request of its own (the deadline
+        scheduler's finished-match write) calls this before touching the
+        database. It is cheap when the context is already built for the
+        running loop and idempotent for callers that already have it
+        bound (HTTP requests, WebSocket connections).
+        """
+        await self._bind()
+
     async def _bind(self) -> None:
         loop = get_running_loop()
         if self._init_loop is not loop:

server/packages/tavolo-platform/tests/helpers.py

@@ -248,7 +248,12 @@ def make_platform(
         spec_path="/api/openapi.json",
         docs_path="/api/docs",
     )
-    scheduler = DeadlineScheduler(game_store, registry, heartbeat_ms=50)
+    scheduler = DeadlineScheduler(
+        game_store,
+        registry,
+        heartbeat_ms=50,
+        context_binder=tortoise_mixin.ensure_context,
+    )
     platform = Platform(
         registry=registry,
         game_store=game_store,

server/packages/tavolo-platform/tests/test_deadlines.py

@@ -75,6 +75,28 @@ class ConnectionIndependenceTest(unittest.TestCase):
         await platform.scheduler.sync_deadline(session)
         self.assertIsNone(await platform.game_store.next_deadline())
 
+    @async_test
+    async def test_tick_finishing_match_persists_result_with_no_connections(self) -> None:
+        # A deadline that ends the match must persist the result from the
+        # consumer task, which has no request context of its own.
+        from tavolo.platform.models import Match
+
+        _, platform, tortoise_mixin = make_platform()
+        store = platform.game_store
+        scheduler = platform.scheduler
+        session = _started_session(target=1, deadline_in_seconds=0.05)
+        await store.save(session)
+        await scheduler.sync_deadline(session)
+
+        # Nobody ever connects: the consumer must finish the match and
+        # write it to Postgres.
+        result = await _wait_for(lambda: _finished(store, session.id))
+        self.assertIsNotNone(result, "deadline never finished the match")
+
+        ctx = await use_db(tortoise_mixin)
+        with ctx:
+            self.assertEqual(1, await Match.all().count())
+
 
 async def _plays_is(store, game_id: str, count: int) -> Optional[GameSession]:
     session = await store.load(game_id)
@@ -83,6 +105,13 @@ async def _plays_is(store, game_id: str, count: int) -> Optional[GameSession]:
     return None
 
 
+async def _finished(store, game_id: str) -> Optional[GameSession]:
+    session = await store.load(game_id)
+    if session is not None and session.state["finished"]:
+        return session
+    return None
+
+
 class ProcessDueTest(unittest.TestCase):
     """Direct ``process_due`` behaviour: engine revalidation and idempotency."""
 
@@ -163,10 +192,11 @@ class ProcessDueTest(unittest.TestCase):
     @async_test
     async def test_finished_match_is_persisted_on_tick(self) -> None:
         # A tick that completes the match writes the result to Postgres.
+        # No context is bound in this task: the scheduler must bind its
+        # own, exactly like its consumer task at app startup.
         from tavolo.platform.models import Match
 
         _, platform, tortoise_mixin = make_platform()
-        ctx = await use_db(tortoise_mixin)
         scheduler = platform.scheduler
         store = platform.game_store
         session = _started_session(target=1, deadline_in_seconds=3600)
@@ -178,9 +208,10 @@ class ProcessDueTest(unittest.TestCase):
             "kind": deadline.kind,
             "token": deadline.token,
         })
+        await scheduler.process_due(member)
+        ctx = await use_db(tortoise_mixin)
         with ctx:
-            await scheduler.process_due(member)
-        self.assertEqual(1, await Match.all().count())
+            self.assertEqual(1, await Match.all().count())
 
 
 if __name__ == "__main__":