黄云龙 ad9ec65c6f
fix(stream_bridge): add stream_exists to MemoryStreamBridge, fixing SSE hang on reconnect after cleanup (#4071)
MemoryStreamBridge is the DEFAULT stream backend. Its subscribe() creates a
fresh ended=False stream on every call via _get_or_create_stream(), but the
Gateway's reconnect guard _terminal_record_stream_missing only detects a
missing stream on bridges that expose stream_exists — and MemoryStreamBridge
did NOT define it (only RedisStreamBridge did). After worker cleanup pops the
stream (~60s post-run), a browser SSE reconnect or POST /wait hits
subscribe() -> creates a zombie stream -> yields heartbeat forever without
ever sending END_SENTINEL. The UI spinner never resolves and the coroutine
pins a server-side connection/request until external timeout.

Add the missing stream_exists method, mirroring RedisStreamBridge.
2026-07-11 22:46:10 +08:00
..
2026-07-07 14:39:04 +08:00