This commit fixes two critical bugs in the Feishu adapter that affect
message reliability and process lifecycle.
**Bug Fix 1: Intermittent Message Drops**
Root cause: Event handler was created once in __init__ and reused across
reconnects, causing callbacks to capture stale loop references. When the
adapter disconnected and reconnected, old callbacks continued firing with
invalid loop references, resulting in dropped messages with warnings:
"[Feishu] Dropping inbound message before adapter loop is ready"
Fix:
- Rebuild event handler on each connect (websocket/webhook)
- Clear handler on disconnect
- Ensure callbacks always capture current valid loop
- Add defensive loop.is_closed() checks with getattr for test compatibility
- Unify webhook dispatch path to use same loop checks as websocket mode
**Bug Fix 2: Process Hangs on Ctrl+C / SIGTERM**
Root cause: Feishu SDK's websocket client runs in a background thread with
an infinite _select() loop that never exits naturally. The thread was never
properly joined on disconnect, causing processes to hang indefinitely after
Ctrl+C or gateway stop commands.
Fix:
- Store reference to thread-local event loop (_ws_thread_loop)
- On disconnect, cancel all tasks in thread loop and stop it gracefully
via call_soon_threadsafe()
- Await thread future with 10s timeout
- Clean up pending tasks in thread's finally block before closing loop
- Add detailed debug logging for disconnect flow
**Additional Improvements:**
- Add regression tests for disconnect cleanup and webhook dispatch
- Ensure all event callbacks check loop readiness before dispatching
Tested on Linux with websocket mode. All Feishu tests pass.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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