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How to use _get_proxy_channel method in tempest

Best Python code snippet using tempest_python

ssh.py

Source:ssh.py

...66                     self.host, self.port, self.username, str(self.password))67        attempts = 068        while True:69            if self.proxy_client is not None:70                proxy_chan = self._get_proxy_channel()71            else:72                proxy_chan = None73            try:74                ssh.connect(self.host, port=self.port, username=self.username,75                            password=self.password,76                            look_for_keys=self.look_for_keys,77                            key_filename=self.key_filename,78                            timeout=self.channel_timeout, pkey=self.pkey,79                            sock=proxy_chan)80                LOG.info("ssh connection to %s@%s successfully created",81                         self.username, self.host)82                return ssh83            except (EOFError,84                    socket.error, socket.timeout,85                    paramiko.SSHException) as e:86                ssh.close()87                if self._is_timed_out(_start_time):88                    LOG.exception("Failed to establish authenticated ssh"89                                  " connection to %s@%s after %d attempts",90                                  self.username, self.host, attempts)91                    raise exceptions.SSHTimeout(host=self.host,92                                                user=self.username,93                                                password=self.password)94                bsleep += backoff95                attempts += 196                LOG.warning("Failed to establish authenticated ssh"97                            " connection to %s@%s (%s). Number attempts: %s."98                            " Retry after %d seconds.",99                            self.username, self.host, e, attempts, bsleep)100                time.sleep(bsleep)101    def _is_timed_out(self, start_time):102        return (time.time() - self.timeout) > start_time103    @staticmethod104    def _can_system_poll():105        return hasattr(select, 'poll')106    def exec_command(self, cmd, encoding="utf-8"):107        """Execute the specified command on the server108        Note that this method is reading whole command outputs to memory, thus109        shouldn't be used for large outputs.110        :param str cmd: Command to run at remote server.111        :param str encoding: Encoding for result from paramiko.112                             Result will not be decoded if None.113        :returns: data read from standard output of the command.114        :raises: SSHExecCommandFailed if command returns nonzero115                 status. The exception contains command status stderr content.116        :raises: TimeoutException if cmd doesn't end when timeout expires.117        """118        ssh = self._get_ssh_connection()119        transport = ssh.get_transport()120        with transport.open_session() as channel:121            channel.fileno()  # Register event pipe122            channel.exec_command(cmd)123            channel.shutdown_write()124            # If the executing host is linux-based, poll the channel125            if self._can_system_poll():126                out_data_chunks = []127                err_data_chunks = []128                poll = select.poll()129                poll.register(channel, select.POLLIN)130                start_time = time.time()131                while True:132                    ready = poll.poll(self.channel_timeout)133                    if not any(ready):134                        if not self._is_timed_out(start_time):135                            continue136                        raise exceptions.SSHTimeout(host=self.host,137                                                    user=self.username,138                                                    password=self.password)139                        # raise exceptions.TimeoutException(140                        #     "Command: '{0}' executed on host '{1}'.".format(141                        #         cmd, self.host))142                    if not ready[0]:  # If there is nothing to read.143                        continue144                    out_chunk = err_chunk = None145                    if channel.recv_ready():146                        out_chunk = channel.recv(self.buf_size)147                        out_data_chunks += out_chunk,148                    if channel.recv_stderr_ready():149                        err_chunk = channel.recv_stderr(self.buf_size)150                        err_data_chunks += err_chunk,151                    if not err_chunk and not out_chunk:152                        break153                out_data = b''.join(out_data_chunks)154                err_data = b''.join(err_data_chunks)155            # Just read from the channels156            else:157                out_file = channel.makefile('rb', self.buf_size)158                err_file = channel.makefile_stderr('rb', self.buf_size)159                out_data = out_file.read()160                err_data = err_file.read()161            if encoding:162                out_data = out_data.decode(encoding)163                err_data = err_data.decode(encoding)164            exit_status = channel.recv_exit_status()165            if 0 != exit_status:166                raise exceptions.SSHExecCommandFailed(167                    command=cmd, exit_status=exit_status,168                    stderr=err_data, stdout=out_data)169            transport.close()170            return out_data171    def test_connection_auth(self):172        """Raises an exception when we can not connect to server via ssh."""173        connection = self._get_ssh_connection()174        connection.close()175    def _get_proxy_channel(self):176        conn = self.proxy_client._get_ssh_connection()177        # Keep a reference to avoid g/c178        # https://github.com/paramiko/paramiko/issues/440179        self._proxy_conn = conn180        transport = conn.get_transport()181        chan = transport.open_session()182        cmd = 'nc %s %s' % (self.host, self.port)183        chan.exec_command(cmd)...

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