def _ssh_execute(ssh, cmd, ssh_params):
# NOTE(yuriyz): this ugly code is work-around against paramiko with
# eventlet issues
LOG.debug('Running cmd (SSH): %s', cmd)
stdin_stream, stdout_stream, stderr_stream = ssh.exec_command(cmd)
paramiko_channel = stdout_stream.channel
paramiko_channel.setblocking(0)
stdout_io = six.moves.StringIO()
stderr_io = six.moves.StringIO()
def _wait_execution(mutable, channel):
try:
stdout_data = channel.recv(1048576)
except Exception:
LOG.debug('No data from SSH stdout.')
else:
LOG.debug('Got %d from SSH stdout.', len(stdout_data))
stdout_io.write(stdout_data)
try:
stderr_data = channel.recv_stderr(1048576)
except Exception:
LOG.debug('No data from SSH stderr.')
else:
LOG.debug('Got %d from SSH stderr.', len(stderr_data))
stderr_io.write(stderr_data)
if channel.exit_status_ready():
raise loopingcall.LoopingCallDone()
try:
ssh = utils.ssh_connect(ssh_params)
except exception.SSHConnectFailed:
mutable['error'] = True
raise loopingcall.LoopingCallDone()
else:
ssh.close()
error = {'error': False}
timer = loopingcall.FixedIntervalLoopingCall(_wait_execution, error,
paramiko_channel)
timer.start(interval=60).wait()
stdout = stdout_io.getvalue()
stderr = stderr_io.getvalue()
LOG.debug('SSH stdout is: "%s"', stdout)
LOG.debug('SSH stderr is: "%s"', stderr)
if error['error']:
message = _('connection to the node lost')
raise exception.SSHCommandFailed(cmd=message)
exit_status = paramiko_channel.recv_exit_status()
if exit_status != 0:
message = _('wrong exit status %d') % exit_status
raise exception.SSHCommandFailed(cmd=message)
return stdout, stderr
def _ssh_execute(ssh_obj, cmd_to_exec):
"""Executes a command via ssh.
Executes a command via ssh and returns a list of the lines of the
output from the command.
:param ssh_obj: paramiko.SSHClient, an active ssh connection.
:param cmd_to_exec: command to execute.
:returns: list of the lines of output from the command.
:raises: SSHCommandFailed on an error from ssh.
"""
LOG.debug(_translators.log_error("Executing SSH cmd: %r"), cmd_to_exec)
try:
output_list = processutils.ssh_execute(ssh_obj,
cmd_to_exec)[0].split('\n')
except Exception as e:
LOG.error(
_translators.log_error(
"Cannot execute SSH cmd %(cmd)s. Reason: %(err)s."), {
'cmd': cmd_to_exec,
'err': e
})
raise exception.SSHCommandFailed(cmd=cmd_to_exec)
return output_list
