Source code for airflow.contrib.operators.sftp_operator

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import os

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 SFTPOperation(object):
[docs] PUT = 'put'
[docs] GET = 'get'
[docs]class SFTPOperator(BaseOperator): """ SFTPOperator for transferring files from remote host to local or vice a versa. This operator uses ssh_hook to open sftp transport channel that serve as basis for file transfer. :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: airflow.contrib.hooks.ssh_hook.SSHHook :param ssh_conn_id: connection id from airflow Connections. `ssh_conn_id` will be ignored 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 local_filepath: local file path to get or put. (templated) :type local_filepath: str :param remote_filepath: remote file path to get or put. (templated) :type remote_filepath: str :param operation: specify operation 'get' or 'put', defaults to put :type operation: str :param confirm: specify if the SFTP operation should be confirmed, defaults to True :type confirm: bool :param create_intermediate_dirs: create missing intermediate directories when copying from remote to local and vice-versa. Default is False. Example: The following task would copy ``file.txt`` to the remote host at ``/tmp/tmp1/tmp2/`` while creating ``tmp``,``tmp1`` and ``tmp2`` if they don't exist. If the parameter is not passed it would error as the directory does not exist. :: put_file = SFTPOperator( task_id="test_sftp", ssh_conn_id="ssh_default", local_filepath="/tmp/file.txt", remote_filepath="/tmp/tmp1/tmp2/file.txt", operation="put", create_intermediate_dirs=True, dag=dag ) :type create_intermediate_dirs: bool """
[docs] template_fields = ('local_filepath', 'remote_filepath', 'remote_host')
@apply_defaults def __init__(self, ssh_hook=None, ssh_conn_id=None, remote_host=None, local_filepath=None, remote_filepath=None, operation=SFTPOperation.PUT, confirm=True, create_intermediate_dirs=False, *args, **kwargs): super(SFTPOperator, self).__init__(*args, **kwargs) self.ssh_hook = ssh_hook self.ssh_conn_id = ssh_conn_id self.remote_host = remote_host self.local_filepath = local_filepath self.remote_filepath = remote_filepath self.operation = operation self.confirm = confirm self.create_intermediate_dirs = create_intermediate_dirs if not (self.operation.lower() == SFTPOperation.GET or self.operation.lower() == SFTPOperation.PUT): raise TypeError("unsupported operation value {0}, expected {1} or {2}" .format(self.operation, SFTPOperation.GET, SFTPOperation.PUT))
[docs] def execute(self, context): file_msg = None 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) 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 with self.ssh_hook.get_conn() as ssh_client: sftp_client = ssh_client.open_sftp() if self.operation.lower() == SFTPOperation.GET: local_folder = os.path.dirname(self.local_filepath) if self.create_intermediate_dirs: # Create Intermediate Directories if it doesn't exist try: os.makedirs(local_folder) except OSError: if not os.path.isdir(local_folder): raise file_msg = "from {0} to {1}".format(self.remote_filepath, self.local_filepath)"Starting to transfer %s", file_msg) sftp_client.get(self.remote_filepath, self.local_filepath) else: remote_folder = os.path.dirname(self.remote_filepath) if self.create_intermediate_dirs: _make_intermediate_dirs( sftp_client=sftp_client, remote_directory=remote_folder, ) file_msg = "from {0} to {1}".format(self.local_filepath, self.remote_filepath)"Starting to transfer file %s", file_msg) sftp_client.put(self.local_filepath, self.remote_filepath, confirm=self.confirm) except Exception as e: raise AirflowException("Error while transferring {0}, error: {1}" .format(file_msg, str(e))) return self.local_filepath
[docs]def _make_intermediate_dirs(sftp_client, remote_directory): """ Create all the intermediate directories in a remote host :param sftp_client: A Paramiko SFTP client. :param remote_directory: Absolute Path of the directory containing the file :return: """ if remote_directory == '/': sftp_client.chdir('/') return if remote_directory == '': return try: sftp_client.chdir(remote_directory) except IOError: dirname, basename = os.path.split(remote_directory.rstrip('/')) _make_intermediate_dirs(sftp_client, dirname) sftp_client.mkdir(basename) sftp_client.chdir(basename) return

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