Error on connection.close()

[kenfehling]

Hi. First off thanks for bringing SignalR to Python!

I'm getting an error when I try to call connection.close() and it's really perplexing me, especially since none of the lines in the stack trace are my code.

Traceback (most recent call last):
  File "/Users/ken/anaconda/lib/python3.6/site-packages/gevent/greenlet.py", line 536, in run
    result = self._run(*self.args, **self.kwargs)
  File "/Users/ken/anaconda/lib/python3.6/site-packages/signalr/_connection.py", line 53, in wrapped_listener
    listener()
  File "/Users/ken/anaconda/lib/python3.6/site-packages/signalr/transports/_ws_transport.py", line 42, in _receive
    for notification in self.ws:
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_core.py", line 105, in __iter__
    yield self.recv()
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_core.py", line 293, in recv
    opcode, data = self.recv_data()
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_core.py", line 310, in recv_data
    opcode, frame = self.recv_data_frame(control_frame)
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_core.py", line 323, in recv_data_frame
    frame = self.recv_frame()
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_core.py", line 357, in recv_frame
    return self.frame_buffer.recv_frame()
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_abnf.py", line 336, in recv_frame
    self.recv_header()
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_abnf.py", line 286, in recv_header
    header = self.recv_strict(2)
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_abnf.py", line 371, in recv_strict
    bytes_ = self.recv(min(16384, shortage))
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_core.py", line 427, in _recv
    return recv(self.sock, bufsize)
  File "/Users/ken/anaconda/lib/python3.6/site-packages/websocket/_socket.py", line 80, in recv
    bytes_ = sock.recv(bufsize)
  File "/Users/ken/anaconda/lib/python3.6/site-packages/gevent/_ssl3.py", line 460, in recv
    return self.read(buflen)
  File "/Users/ken/anaconda/lib/python3.6/site-packages/gevent/_ssl3.py", line 282, in read
    raise ValueError("Read on closed or unwrapped SSL socket.")
ValueError: Read on closed or unwrapped SSL socket.
Sat Jul  1 17:13:01 2017 <Greenlet at 0x1223a5768: wrapped_listener> failed with ValueError

[PaulPatena]

I'm having the exact same issue. Im using python 2.7.12 and signalr-client 0.0.7. When I close the connection, I traced the call stack, it would hang when executing this line.

[i3wangyi]

Same to me! Any ideas on how to catch the exception?

[PlamenHristov]

The code needs to be changed to:

def close(self):
       gevent.kill(self.__greenlet)
       while not self.__greenlet.dead:
               gevent.sleep()
       self.__transport.close()

You need to wait for gevent to stop the listener, otherwise the close() and listener() try to aquire the same lock and deadlock themselves.

[ngunhaSO]

Any update for this issue?

[k12007]

@PlamenHristov thanks for providing the solution!(finally no longer see that annoying exception)
@ngunhaSO I believe signalr-client is no longer active, so you going have to get your hands dirty and change the code yourself (or find a fork that is active)