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0565497dcc
The plugin used to spawn one daemon thread per sync_turn() to do the
aretain_batch network write. On CLI exit, that pattern raced interpreter
shutdown — the last retain could reach aiohttp after asyncio's
"cannot schedule new futures" guard had fired, producing noisy logs and
silently losing the final unsaved turn:
WARNING ... Hindsight sync failed: cannot schedule new futures after
interpreter shutdown
ERROR asyncio: Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x...>
Switch to a single-writer model: each provider owns one long-lived
writer thread plus a queue. sync_turn() snapshots state and enqueues a
job; the writer drains sequentially. Once shutdown() is called:
- new sync_turn() / queue_prefetch() calls are dropped, not enqueued
- a sentinel wakes the writer so it finishes in-flight work
- shutdown joins the writer (10s) before nulling the client
Also register an idempotent atexit hook from the first sync_turn(), so
exit paths that don't go through MemoryManager.shutdown_all() (Ctrl-C,
abrupt exit) still get a chance to drain.
Tests: keep _sync_thread as a legacy alias to the writer, swap join()
calls to _retain_queue.join() (canonical wait-for-drain), add a new
TestShutdownRace suite covering single-writer reuse, post-shutdown drop,
queue draining, and shutdown idempotency.