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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
import sys
from urllib.parse import urlparse
from .base import DownloaderBase
LOG = logging.getLogger(__name__)
class FileDownloaderBase(DownloaderBase):
def __init__(self, url, **kwargs):
super().__init__(url, **kwargs)
o = urlparse(self.url)
path = o.path
if sys.platform == "win32" and self.url.startswith("file://"):
# this is because urllib does not decode
# 'file://C:\Users\name\climetlab\docs\examples\test.nc'
# as expected.
path = self.url[len("file://") :]
if sys.platform == "win32" and path[0] == "/" and path[2] == ":":
path = path[1:]
self.path = path
class FullFileDownloader(FileDownloaderBase):
def local_path(self):
return self.path
def __repr__(self):
return f"FullFileDownloader({self.path})"
def estimate_size(self, target):
# TODO: resume transfers
size = os.path.getsize(self.path)
return (size, "wb", 0, True)
def transfer(self, f, pbar):
total = 0
with open(self.path, "rb") as g:
while True:
chunk = g.read(self.chunk_size)
if not chunk:
break
f.write(chunk)
pbar.update(len(chunk))
total += len(chunk)
return total
class PartFileDownloader(FileDownloaderBase):
def __repr__(self):
return f"PartFileDownloader({self.path, self.parts})"
def estimate_size(self, target):
parts = self.parts
size = sum(p.length for p in parts)
return (size, "wb", 0, True)
def transfer(self, f, pbar):
with open(self.path, "rb") as g:
total = 0
for offset, length in self.parts:
g.seek(offset)
self.observer()
while length > 0:
chunk = g.read(min(length, self.chunk_size))
assert chunk
f.write(chunk)
length -= len(chunk)
total += len(chunk)
pbar.update(len(chunk))
return total
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