def read_head_info(cls, url):
try:
req = HEADRequest(url)
res = urlopen(req)
except IOError:
raise DownloadError('Failed to fetch %s' % url)
else:
if res.code != 200:
raise DownloadError('Failed to fetch %s' % url)
return res.info()
def read(cls, url):
try:
r = urlopen(url)
except IOError:
raise DownloadError('Failed to fetch %s' % url)
else:
return r.read()
def urlretrieve(url, filename, reporthook, sha256sum):
try:
_urlretrieve(url, filename, reporthook)
if not validate_sha256(filename, sha256sum):
raise DownloadError(
"Corrupted download, the sha256 doesn't match")
except BaseException:
os.unlink(filename)
raise
def fetch(cls, url, filename, expected_sha256=None):
b = ProgressBar()
try:
urlretrieve(url, filename, b.reporthook, sha256sum=expected_sha256)
sys.stdout.write('\n')
except DownloadError:
if os.path.exists(filename):
os.unlink(filename)
raise
except IOError:
sys.stdout.write('\n')
raise DownloadError('Failed to fetch %s from %s' % (filename, url))