ServerProxy does not seem to be thread-safe.
For e.g. a 2of3 multisig wallet, which would send two messages,
one msg would get sent but the other might error out. See trace:
E | plugins.cosigner_pool.qt.Plugin | on_failure
Traceback (most recent call last):
File "...\electrum\electrum\gui\qt\util.py", line 832, in run
result = task.task()
File "...\electrum\electrum\plugins\cosigner_pool\qt.py", line 199, in <lambda>
task = lambda: server.put(_hash, message)
File "...\Python38\lib\xmlrpc\client.py", line 1109, in __call__
return self.__send(self.__name, args)
File "...\Python38\lib\xmlrpc\client.py", line 1450, in __request
response = self.__transport.request(
File "...\Python38\lib\xmlrpc\client.py", line 1153, in request
return self.single_request(host, handler, request_body, verbose)
File "...\Python38\lib\xmlrpc\client.py", line 1165, in single_request
http_conn = self.send_request(host, handler, request_body, verbose)
File "...\Python38\lib\xmlrpc\client.py", line 1271, in send_request
connection.putrequest("POST", handler, skip_accept_encoding=True)
File "...\Python38\lib\http\client.py", line 1088, in putrequest
raise CannotSendRequest(self.__state)
http.client.CannotSendRequest: Request-sent
