Source code for airflow.contrib.operators.ssh_operator

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from base64 import b64encode
from select import select

from airflow import configuration
from airflow.contrib.hooks.ssh_hook import SSHHook
from airflow.exceptions import AirflowException
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults

[docs]class SSHOperator(BaseOperator): """ SSHOperator to execute commands on given remote host using the ssh_hook. :param ssh_hook: predefined ssh_hook to use for remote execution. Either `ssh_hook` or `ssh_conn_id` needs to be provided. :type ssh_hook: :class:`SSHHook` :param ssh_conn_id: connection id from airflow Connections. `ssh_conn_id` will be ingored if `ssh_hook` is provided. :type ssh_conn_id: str :param remote_host: remote host to connect (templated) Nullable. If provided, it will replace the `remote_host` which was defined in `ssh_hook` or predefined in the connection of `ssh_conn_id`. :type remote_host: str :param command: command to execute on remote host. (templated) :type command: str :param timeout: timeout (in seconds) for executing the command. :type timeout: int :param do_xcom_push: return the stdout which also get set in xcom by airflow platform :type do_xcom_push: bool """ template_fields = ('command', 'remote_host') template_ext = ('.sh',) @apply_defaults def __init__(self, ssh_hook=None, ssh_conn_id=None, remote_host=None, command=None, timeout=10, do_xcom_push=False, *args, **kwargs): super(SSHOperator, self).__init__(*args, **kwargs) self.ssh_hook = ssh_hook self.ssh_conn_id = ssh_conn_id self.remote_host = remote_host self.command = command self.timeout = timeout self.do_xcom_push = do_xcom_push def execute(self, context): try: if self.ssh_conn_id: if self.ssh_hook and isinstance(self.ssh_hook, SSHHook):"ssh_conn_id is ignored when ssh_hook is provided.") else:"ssh_hook is not provided or invalid. " + "Trying ssh_conn_id to create SSHHook.") self.ssh_hook = SSHHook(ssh_conn_id=self.ssh_conn_id, timeout=self.timeout) if not self.ssh_hook: raise AirflowException("Cannot operate without ssh_hook or ssh_conn_id.") if self.remote_host is not None:"remote_host is provided explicitly. " + "It will replace the remote_host which was defined " + "in ssh_hook or predefined in connection of ssh_conn_id.") self.ssh_hook.remote_host = self.remote_host if not self.command: raise AirflowException("SSH command not specified. Aborting.") with self.ssh_hook.get_conn() as ssh_client: # Auto apply tty when its required in case of sudo get_pty = False if self.command.startswith('sudo'): get_pty = True # set timeout taken as params stdin, stdout, stderr = ssh_client.exec_command(command=self.command, get_pty=get_pty, timeout=self.timeout ) # get channels channel = # closing stdin stdin.close() channel.shutdown_write() agg_stdout = b'' agg_stderr = b'' # capture any initial output in case channel is closed already stdout_buffer_length = len( if stdout_buffer_length > 0: agg_stdout += # read from both stdout and stderr while not channel.closed or \ channel.recv_ready() or \ channel.recv_stderr_ready(): readq, _, _ = select([channel], [], [], self.timeout) for c in readq: if c.recv_ready(): line = line = line agg_stdout += line'utf-8').strip('\n')) if c.recv_stderr_ready(): line = line = line agg_stderr += line self.log.warning(line.decode('utf-8').strip('\n')) if\ and not\ and not break stdout.close() stderr.close() exit_status = if exit_status is 0: # returning output if do_xcom_push is set if self.do_xcom_push: enable_pickling = configuration.conf.getboolean( 'core', 'enable_xcom_pickling' ) if enable_pickling: return agg_stdout else: return b64encode(agg_stdout).decode('utf-8') else: error_msg = agg_stderr.decode('utf-8') raise AirflowException("error running cmd: {0}, error: {1}" .format(self.command, error_msg)) except Exception as e: raise AirflowException("SSH operator error: {0}".format(str(e))) return True def tunnel(self): ssh_client = self.ssh_hook.get_conn() ssh_client.get_transport()