* fix(memory): replace short-lived asyncio.run() with persistent event loop to prevent zombie httpx connections
The memory updater used asyncio.run() inside daemon threads, creating
and destroying short-lived event loops on every update. Langchain
providers (e.g. langchain-anthropic) cache httpx AsyncClient instances
globally via @lru_cache, so SSL connections created on a loop that is
subsequently destroyed become zombie connections in the shared pool.
When the main agent's lead run later reuses one of these connections,
httpx/anyio triggers RuntimeError: Event loop is closed during
connection cleanup.
Replace the ThreadPoolExecutor + asyncio.run() pattern with a
_MemoryLoopRunner that maintains a single persistent event loop in a
daemon thread for the process lifetime. Since the loop never closes,
connections bound to it never become invalid. The _run_async_update_sync
function now submits coroutines to this persistent loop via
run_coroutine_threadsafe instead of creating throwaway loops.
* update the code to address the review comments
* Fix the review comments of 2615
P1 — user_id forwarded through sync path: Added user_id parameter to _prepare_update_prompt, _finalize_update, and _do_update_memory_sync, and forwarded it to get_memory_data(agent_name, user_id=user_id) and
save(..., user_id=user_id). The update_memory() entry point now passes user_id through both the executor.submit path and the direct call path. Added TestUserIdForwarding with two regression tests (sync + async)
verifying get_memory_data and save receive the correct user_id.
P2 — aupdate_memory() delegates to sync: Replaced the model.ainvoke() call with asyncio.to_thread(self._do_update_memory_sync, ...). This eliminates the unsafe async provider client path entirely — all memory
updater entry points now use the isolated sync model.invoke() path. Updated the test from asserting ainvoke is awaited to asserting invoke is called and ainvoke is not.
Nit — duplicate comment removed: Removed the duplicated # Matches sentences... comment on line 230.
* Chore(test): update the code of test_memory_updater
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Co-authored-by: rayhpeng <rayhpeng@gmail.com>
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