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Open Source Computer Vision Library
https://opencv.org/
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75 lines
2.4 KiB
75 lines
2.4 KiB
6 years ago
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#!/usr/bin/env python
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from __future__ import print_function
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import hashlib
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import time
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import sys
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import xml.etree.ElementTree as ET
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if sys.version_info[0] < 3:
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from urllib2 import urlopen
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else:
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from urllib.request import urlopen
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class HashMismatchException(Exception):
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def __init__(self, expected, actual):
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Exception.__init__(self)
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self.expected = expected
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self.actual = actual
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def __str__(self):
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return 'Hash mismatch: {} vs {}'.format(self.expected, self.actual)
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class MetalinkDownloader(object):
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BUFSIZE = 10*1024*1024
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NS = {'ml': 'urn:ietf:params:xml:ns:metalink'}
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tick = 0
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def download(self, metalink_file):
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status = True
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for file_elem in ET.parse(metalink_file).getroot().findall('ml:file', self.NS):
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url = file_elem.find('ml:url', self.NS).text
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fname = file_elem.attrib['name']
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hash_sum = file_elem.find('ml:hash', self.NS).text
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print('*** {}'.format(fname))
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try:
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self.verify(hash_sum, fname)
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except Exception as ex:
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print(' {}'.format(ex))
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try:
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print(' {}'.format(url))
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with open(fname, 'wb') as file_stream:
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self.buffered_read(urlopen(url), file_stream.write)
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self.verify(hash_sum, fname)
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except Exception as ex:
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print(' {}'.format(ex))
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print(' FAILURE')
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status = False
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continue
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print(' SUCCESS')
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return status
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def print_progress(self, msg, timeout = 0):
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if time.time() - self.tick > timeout:
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print(msg, end='')
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sys.stdout.flush()
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self.tick = time.time()
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def buffered_read(self, in_stream, processing):
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self.print_progress(' >')
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while True:
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buf = in_stream.read(self.BUFSIZE)
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if not buf:
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break
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processing(buf)
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self.print_progress('>', 5)
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print(' done')
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def verify(self, hash_sum, fname):
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sha = hashlib.sha1()
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with open(fname, 'rb') as file_stream:
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self.buffered_read(file_stream, sha.update)
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if hash_sum != sha.hexdigest():
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raise HashMismatchException(hash_sum, sha.hexdigest())
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if __name__ == '__main__':
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sys.exit(0 if MetalinkDownloader().download('weights.meta4') else 1)
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