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How to use _can_system_poll method in tempest

Best Python code snippet using tempest_python

ssh.py

Source:ssh.py

...82                time.sleep(bsleep)83    def _is_timed_out(self, start_time):84        return (time.time() - self.timeout) > start_time85    @staticmethod86    def _can_system_poll():87        return hasattr(select, 'poll')88    def exec_command(self, cmd):89        """Execute the specified command on the server90        Note that this method is reading whole command outputs to memory, thus91        shouldn't be used for large outputs.92        :param str cmd: Command to run at remote server.93        :returns: data read from standard output of the command.94        :raises: SSHExecCommandFailed if command returns nonzero95                 status. The exception contains command status stderr content.96        :raises: TimeoutException if cmd doesn't end when timeout expires.97        """98        ssh = self._get_ssh_connection()99        transport = ssh.get_transport()100        channel = transport.open_session()101        channel.fileno()  # Register event pipe102        channel.exec_command(cmd)103        channel.shutdown_write()104        exit_status = channel.recv_exit_status()105        # If the executing host is linux-based, poll the channel106        if self._can_system_poll():107            out_data_chunks = []108            err_data_chunks = []109            poll = select.poll()110            poll.register(channel, select.POLLIN)111            start_time = time.time()112            while True:113                ready = poll.poll(self.channel_timeout)114                if not any(ready):115                    if not self._is_timed_out(start_time):116                        continue117                    raise exceptions.TimeoutException(118                        "Command: '{0}' executed on host '{1}'.".format(119                            cmd, self.host))120                if not ready[0]:  # If there is nothing to read....

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