electrums crash on WSS connection

[tonymorony]

that looks like a huge airdex blocker [ CC @cipig @ca333 @yurii-khi ]
From time to time our electrums crash on websocket connection

Dec 17 09:48:43 electrum3 electrumx_server[3796884]: websockets.exceptions.ConnectionClosedError: code = 1006 (connection closed abnormally [internal]), no reason

the issue looks the same as:
kyuupichan/electrumx#966

[cipig]

updated python websockets lib to websockets-10.1 and the issue seemed to be gone, but i just caught a new crash on KMD:

Jan 02 12:55:02 electrum3 electrumx_server[1446915]: ERROR:electrumx:ElectrumX server terminated abnormally
Jan 02 12:55:02 electrum3 electrumx_server[1446915]: Traceback (most recent call last):
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/websockets/legacy/protocol.py", line 944, in transfer_data
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     message = await self.read_message()
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/websockets/legacy/protocol.py", line 1013, in read_message
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     frame = await self.read_data_frame(max_size=self.max_size)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/websockets/legacy/protocol.py", line 1089, in read_data_frame
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     frame = await self.read_frame(max_size)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/websockets/legacy/protocol.py", line 1148, in read_frame
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     extensions=self.extensions,
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/websockets/legacy/framing.py", line 70, in read
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     data = await reader(2)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/lib/python3.7/asyncio/streams.py", line 679, in readexactly
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self._wait_for_data('readexactly')
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/lib/python3.7/asyncio/streams.py", line 473, in _wait_for_data
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self._waiter
Jan 02 12:55:02 electrum3 electrumx_server[1446915]: concurrent.futures._base.CancelledError
Jan 02 12:55:02 electrum3 electrumx_server[1446915]: The above exception was the direct cause of the following exception:
Jan 02 12:55:02 electrum3 electrumx_server[1446915]: Traceback (most recent call last):
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/bin/electrumx_server", line 35, in main
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     asyncio.run(controller.run())
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/lib/python3.7/asyncio/runners.py", line 43, in run
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     return loop.run_until_complete(main)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "uvloop/loop.pyx", line 1501, in uvloop.loop.Loop.run_until_complete
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/electrumx/lib/server_base.py", line 129, in run
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await server_task
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/electrumx/lib/server_base.py", line 102, in serve
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self.serve(shutdown_event)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/electrumx/server/controller.py", line 134, in serve
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await group.spawn(wait_for_catchup())
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/aiorpcx/curio.py", line 255, in __aexit__
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self.join()
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/aiorpcx/curio.py", line 213, in join
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     raise task.exception()
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/electrumx/server/session.py", line 641, in serve
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await group.spawn(self._manage_servers())
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/aiorpcx/curio.py", line 255, in __aexit__
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self.join()
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/aiorpcx/curio.py", line 213, in join
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     raise task.exception()
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/electrumx/server/session.py", line 1016, in notify
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self.send_notification('blockchain.headers.subscribe', args)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/aiorpcx/session.py", line 542, in send_notification
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self._send_message(message)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/aiorpcx/session.py", line 153, in _send_message
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self.transport.write(message)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/aiorpcx/websocket.py", line 85, in write
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self.websocket.send(framed_message)
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/websockets/legacy/protocol.py", line 619, in send
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     await self.ensure_open()
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:   File "/usr/local/lib/python3.7/dist-packages/websockets/legacy/protocol.py", line 929, in ensure_open
Jan 02 12:55:02 electrum3 electrumx_server[1446915]:     raise self.connection_closed_exc()
Jan 02 12:55:02 electrum3 electrumx_server[1446915]: websockets.exceptions.ConnectionClosedError: sent 1011 (unexpected error) keepalive ping timeout; no close frame received

[cipig]

i see the config is wrong, this is KMD

    "electrum": [
      {
        "url": "electrum3.cipig.net:10001",
        "ws_url": "electrum3.cipig.net:30001"
      },
      {
        "url": "electrum2.cipig.net:10001",
        "ws_url": "electrum3.cipig.net:30001"
      },
      {
        "url": "electrum1.cipig.net:10001",
        "ws_url": "electrum3.cipig.net:30001"
      }
    ],

in https://github.com/KomodoPlatform/atomicDEX-Desktop/blob/dev/assets/config/0.5.4-coins.json#L4702
so it has electrum3 setup 3x for wss... maybe part of the problem
KomodoPlatform/komodo-wallet#1557

[cipig]

this issue is fixed