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# (C) Copyright 2021 ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation
# nor does it submit to any jurisdiction.
#
import logging
import os
from ftplib import FTP, error_perm
from urllib.parse import urlparse
from .base import DownloaderBase
LOG = logging.getLogger(__name__)
class FTPDownloaderBase(DownloaderBase):
def __init__(self, url, **kwargs):
super().__init__(url, **kwargs)
def estimate_size(self, target):
url_object = urlparse(self.url)
assert url_object.scheme == "ftp"
user, password = url_object.username, url_object.password
ftp = FTP(timeout=self.timeout)
connect_kwargs = {}
if url_object.port is not None:
connect_kwargs["port"] = url_object.port
ftp.connect(host=url_object.hostname, **connect_kwargs)
ftp.login(user, password)
ftp.cwd(os.path.dirname(url_object.path))
ftp.set_pasv(True)
self.filename = os.path.basename(url_object.path)
self.ftp = ftp
try:
return (ftp.size(self.filename), "wb", 0, True)
except error_perm:
return (-1, "wb", True, False)
def transfer(self, f, pbar):
total = 0
def callback(chunk):
nonlocal total
self.observer()
f.write(chunk)
total += len(chunk)
pbar.update(len(chunk))
self.ftp.retrbinary(f"RETR {self.filename}", callback)
def finalise(self):
self.ftp.close()
class FullFTPDownloader(FTPDownloaderBase):
def __repr__(self):
return f"FullFTPDownloader({self.url})"
class PartFTPDownloader(FTPDownloaderBase):
def __init__(self, url, **kwargs):
# If needed, that can be implemented with the PartFilter
raise NotImplementedError("Part FTPDownloader is not yet implemented")
def __repr__(self):
return f"PartFTPDownloader({self.url, self.parts})"
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