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64 lines
1.9 KiB
Python
Executable file
64 lines
1.9 KiB
Python
Executable file
#!/usr/bin/env python
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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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from __future__ import print_function
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import argparse
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import os
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import sys
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import time
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try:
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from urllib2 import HTTPError, URLError, urlopen
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except ImportError: # For Py3 compatibility
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from urllib.error import HTTPError, URLError
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from urllib.request import urlopen
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def DownloadUrl(url, output_file):
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"""Download url into output_file."""
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CHUNK_SIZE = 4096
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num_retries = 3
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retry_wait_s = 5 # Doubled at each retry.
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while True:
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try:
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sys.stdout.write('Downloading %s...' % url)
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sys.stdout.flush()
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response = urlopen(url)
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bytes_done = 0
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while True:
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chunk = response.read(CHUNK_SIZE)
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if not chunk:
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break
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output_file.write(chunk)
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bytes_done += len(chunk)
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if bytes_done == 0:
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raise URLError("empty response")
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print(' Done.')
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return
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except URLError as e:
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sys.stdout.write('\n')
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print(e)
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if num_retries == 0 or isinstance(e, HTTPError) and e.code == 404:
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raise e
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num_retries -= 1
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print('Retrying in %d s ...' % retry_wait_s)
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sys.stdout.flush()
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time.sleep(retry_wait_s)
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retry_wait_s *= 2
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def main():
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parser = argparse.ArgumentParser(description='Download a file')
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parser.add_argument('--filename', help='where to put the file')
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parser.add_argument('--url', help='what url to download')
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args = parser.parse_args()
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with open(args.filename, "wb") as f:
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DownloadUrl(args.url, f)
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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