Source code for airflow.providers.sftp.operators.sftp

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"""This module contains SFTP operator."""
import os
from pathlib import Path
from typing import Any, Sequence

from airflow.exceptions import AirflowException
from airflow.models import BaseOperator
from airflow.providers.ssh.hooks.ssh import SSHHook

[docs]class SFTPOperation: """Operation that can be used with SFTP/"""
[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. :param ssh_conn_id: :ref:`ssh connection id<howto/connection:ssh>` from airflow Connections. `ssh_conn_id` will be ignored if `ssh_hook` is provided. :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`. :param local_filepath: local file path to get or put. (templated) :param remote_filepath: remote file path to get or put. (templated) :param operation: specify operation 'get' or 'put', defaults to put :param confirm: specify if the SFTP operation should be confirmed, defaults to True :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 ) """
[docs] template_fields: Sequence[str] = ('local_filepath', 'remote_filepath', 'remote_host')
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, **kwargs, ) -> None: super().__init__(**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( f"Unsupported operation value {self.operation}, " f"expected {SFTPOperation.GET} or {SFTPOperation.PUT}." )
[docs] def execute(self, context: Any) -> str: 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: Path(local_folder).mkdir(parents=True, exist_ok=True) file_msg = f"from {self.remote_filepath} to {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 = f"from {self.local_filepath} to {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(f"Error while transferring {file_msg}, error: {str(e)}") return self.local_filepath
def _make_intermediate_dirs(sftp_client, remote_directory) -> None: """ 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 OSError: 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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