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import datetime
import ftplib
import os.path
from airflow.hooks.base_hook import BaseHook
from past.builtins import basestring
[docs]def mlsd(conn, path="", facts=None):
"""
BACKPORT FROM PYTHON3 FTPLIB.
List a directory in a standardized format by using MLSD
command (RFC-3659). If path is omitted the current directory
is assumed. "facts" is a list of strings representing the type
of information desired (e.g. ["type", "size", "perm"]).
Return a generator object yielding a tuple of two elements
for every file found in path.
First element is the file name, the second one is a dictionary
including a variable number of "facts" depending on the server
and whether "facts" argument has been provided.
"""
facts = facts or []
if facts:
conn.sendcmd("OPTS MLST " + ";".join(facts) + ";")
if path:
cmd = "MLSD %s" % path
else:
cmd = "MLSD"
lines = []
conn.retrlines(cmd, lines.append)
for line in lines:
facts_found, _, name = line.rstrip(ftplib.CRLF).partition(' ')
entry = {}
for fact in facts_found[:-1].split(";"):
key, _, value = fact.partition("=")
entry[key.lower()] = value
yield (name, entry)
[docs]class FTPHook(BaseHook):
"""
Interact with FTP.
Errors that may occur throughout but should be handled downstream.
You can specify mode for data transfers in the extra field of your
connection as ``{"passive": "true"}``.
"""
def __init__(self, ftp_conn_id='ftp_default'):
self.ftp_conn_id = ftp_conn_id
self.conn = None
[docs] def __enter__(self):
return self
[docs] def __exit__(self, exc_type, exc_val, exc_tb):
if self.conn is not None:
self.close_conn()
[docs] def get_conn(self):
"""
Returns a FTP connection object
"""
if self.conn is None:
params = self.get_connection(self.ftp_conn_id)
pasv = params.extra_dejson.get("passive", True)
self.conn = ftplib.FTP(params.host, params.login, params.password)
self.conn.set_pasv(pasv)
return self.conn
[docs] def close_conn(self):
"""
Closes the connection. An error will occur if the
connection wasn't ever opened.
"""
conn = self.conn
conn.quit()
self.conn = None
[docs] def describe_directory(self, path):
"""
Returns a dictionary of {filename: {attributes}} for all files
on the remote system (where the MLSD command is supported).
:param path: full path to the remote directory
:type path: str
"""
conn = self.get_conn()
conn.cwd(path)
try:
# only works in Python 3
files = dict(conn.mlsd())
except AttributeError:
files = dict(mlsd(conn))
return files
[docs] def list_directory(self, path, nlst=False):
"""
Returns a list of files on the remote system.
:param path: full path to the remote directory to list
:type path: str
"""
conn = self.get_conn()
conn.cwd(path)
files = conn.nlst()
return files
[docs] def create_directory(self, path):
"""
Creates a directory on the remote system.
:param path: full path to the remote directory to create
:type path: str
"""
conn = self.get_conn()
conn.mkd(path)
[docs] def delete_directory(self, path):
"""
Deletes a directory on the remote system.
:param path: full path to the remote directory to delete
:type path: str
"""
conn = self.get_conn()
conn.rmd(path)
[docs] def retrieve_file(
self,
remote_full_path,
local_full_path_or_buffer,
callback=None):
"""
Transfers the remote file to a local location.
If local_full_path_or_buffer is a string path, the file will be put
at that location; if it is a file-like buffer, the file will
be written to the buffer but not closed.
:param remote_full_path: full path to the remote file
:type remote_full_path: str
:param local_full_path_or_buffer: full path to the local file or a
file-like buffer
:type local_full_path_or_buffer: str or file-like buffer
:param callback: callback which is called each time a block of data
is read. if you do not use a callback, these blocks will be written
to the file or buffer passed in. if you do pass in a callback, note
that writing to a file or buffer will need to be handled inside the
callback.
[default: output_handle.write()]
:type callback: callable
.. code-block:: python
hook = FTPHook(ftp_conn_id='my_conn')
remote_path = '/path/to/remote/file'
local_path = '/path/to/local/file'
# with a custom callback (in this case displaying progress on each read)
def print_progress(percent_progress):
self.log.info('Percent Downloaded: %s%%' % percent_progress)
total_downloaded = 0
total_file_size = hook.get_size(remote_path)
output_handle = open(local_path, 'wb')
def write_to_file_with_progress(data):
total_downloaded += len(data)
output_handle.write(data)
percent_progress = (total_downloaded / total_file_size) * 100
print_progress(percent_progress)
hook.retrieve_file(remote_path, None, callback=write_to_file_with_progress)
# without a custom callback data is written to the local_path
hook.retrieve_file(remote_path, local_path)
"""
conn = self.get_conn()
is_path = isinstance(local_full_path_or_buffer, basestring)
# without a callback, default to writing to a user-provided file or
# file-like buffer
if not callback:
if is_path:
output_handle = open(local_full_path_or_buffer, 'wb')
else:
output_handle = local_full_path_or_buffer
callback = output_handle.write
else:
output_handle = None
remote_path, remote_file_name = os.path.split(remote_full_path)
conn.cwd(remote_path)
self.log.info('Retrieving file from FTP: %s', remote_full_path)
conn.retrbinary('RETR %s' % remote_file_name, callback)
self.log.info('Finished retrieving file from FTP: %s', remote_full_path)
if is_path and output_handle:
output_handle.close()
[docs] def store_file(self, remote_full_path, local_full_path_or_buffer):
"""
Transfers a local file to the remote location.
If local_full_path_or_buffer is a string path, the file will be read
from that location; if it is a file-like buffer, the file will
be read from the buffer but not closed.
:param remote_full_path: full path to the remote file
:type remote_full_path: str
:param local_full_path_or_buffer: full path to the local file or a
file-like buffer
:type local_full_path_or_buffer: str or file-like buffer
"""
conn = self.get_conn()
is_path = isinstance(local_full_path_or_buffer, basestring)
if is_path:
input_handle = open(local_full_path_or_buffer, 'rb')
else:
input_handle = local_full_path_or_buffer
remote_path, remote_file_name = os.path.split(remote_full_path)
conn.cwd(remote_path)
conn.storbinary('STOR %s' % remote_file_name, input_handle)
if is_path:
input_handle.close()
[docs] def delete_file(self, path):
"""
Removes a file on the FTP Server.
:param path: full path to the remote file
:type path: str
"""
conn = self.get_conn()
conn.delete(path)
[docs] def rename(self, from_name, to_name):
"""
Rename a file.
:param from_name: rename file from name
:param to_name: rename file to name
"""
conn = self.get_conn()
return conn.rename(from_name, to_name)
[docs] def get_mod_time(self, path):
"""
Returns a datetime object representing the last time the file was modified
:param path: remote file path
:type path: str
"""
conn = self.get_conn()
ftp_mdtm = conn.sendcmd('MDTM ' + path)
time_val = ftp_mdtm[4:]
# time_val optionally has microseconds
try:
return datetime.datetime.strptime(time_val, "%Y%m%d%H%M%S.%f")
except ValueError:
return datetime.datetime.strptime(time_val, '%Y%m%d%H%M%S')
[docs] def get_size(self, path):
"""
Returns the size of a file (in bytes)
:param path: remote file path
:type path: str
"""
conn = self.get_conn()
return conn.size(path)
[docs]class FTPSHook(FTPHook):
[docs] def get_conn(self):
"""
Returns a FTPS connection object.
"""
if self.conn is None:
params = self.get_connection(self.ftp_conn_id)
pasv = params.extra_dejson.get("passive", True)
if params.port:
ftplib.FTP_TLS.port = params.port
self.conn = ftplib.FTP_TLS(
params.host, params.login, params.password
)
self.conn.set_pasv(pasv)
return self.conn