- Wrap _flush_loop main body in outer try/except to prevent any
unexpected exception (network errors, serialization errors, etc.)
from killing the background thread (which would cause unbounded
queue growth and eventual OOM)
- Wrap _send() call in inner try/except as final safety net
- Wrap RpcClient() construction in try/except (connection failures
during client creation were previously unhandled)
- Add _safe_json() helper: unserializable extra fields fall back to
repr()/str() instead of raising TypeError that could kill thread
- Generate timestamp at push() (enqueue time) instead of _send() time,
so timestamps reflect actual event time even when queue is backed up
- Replace unreliable time.sleep(0.6) in flush() with _flush_done Event
for proper synchronization between caller and background thread
- Add _QUEUE_MAXSIZE=10000 with drop-oldest policy to prevent unbounded
memory growth even in pathological cases
- Use put_nowait with Full handling to ensure push() never blocks
business threads
- Sync fix to all 4 copies: confs/static/smtp/dnfs
qing