这篇博客主要讨论了在Tornado WebSocket应用中遇到的错误情况。在处理WebSocket消息时，遇到了WebSocketClosedError异常，该异常通常发生在尝试向已关闭的连接写入数据时。博客详细记录了错误的堆栈跟踪，包括在尝试写入心跳消息时触发的StreamClosedError。这可能是由于网络中断、客户端断开或其他服务器端问题导致的。
[D 200331 01:31:59 heartbeat:95] WS read message: None
[W 200331 01:31:59 heartbeat:98] WS closed
ERROR:tornado.application:Exception in callback functools.partial(>, exception=WebSocketClosedError()>)
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/tornado/websocket.py", line 1098, in write_message
fut = self._write_frame(True, opcode, message, flags=flags)
File "/usr/local/lib/python3.7/site-packages/tornado/websocket.py", line 1075, in _write_frame
return self.stream.write(frame)
File "/usr/local/lib/python3.7/site-packages/tornado/iostream.py", line 546, in write
self._check_closed()
File "/usr/local/lib/python3.7/site-packages/tornado/iostream.py", line 1008, in _check_closed
raise StreamClosedError(real_error=self.error)
tornado.iostream.StreamClosedError: Stream is closed
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/tornado/ioloop.py", line 743, in _run_callback
ret = callback()
File "/usr/local/lib/python3.7/site-packages/tornado/ioloop.py", line 767, in _discard_future_result
future.result()
File "/Users/jake/atxserver2-ios-provider/heartbeat.py", line 87, in _drain_queue
await self._ws.write_message(message)
File "/Users/jake/atxserver2-ios-provider/heartbeat.py", line 37, in write_message
return await super().write_message(message)
File "/usr/local/lib/python3.7/site-packages/tornado/websocket.py", line 1506, in write_message
return self.protocol.write_message(message, binary=binary)
File "/usr/local/lib/python3.7/site-packages/tornado/websocket.py", line 1100, in write_message
raise WebSocketClosedError()
tornado.websocket.WebSocketClosedError
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