Source code for idstools.net
# Copyright (c) 2013 Jason Ish
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
""" Module for network related operations. """
try:
# Python 3.3...
from urllib.request import urlopen
from urllib.error import HTTPError
except ImportError:
# Python 2.6, 2.7.
from urllib2 import urlopen
from urllib2 import HTTPError
# Number of bytes to read at a time in a GET request.
GET_BLOCK_SIZE = 8192
[docs]def get(url, fileobj, progress_hook=None):
""" Perform a GET request against a URL writing the contents into
the provideded file like object.
:param url: The URL to fetch
:param fileobj: The fileobj to write the content to
:param progress_hook: The function to call with progress updates
:returns: Returns a tuple containing the number of bytes read and
the result of the info() function from urllib2.urlopen().
:raises: Exceptions from urllib2.urlopen() and writing to the
provided fileobj may occur.
"""
remote = urlopen(url)
info = remote.info()
try:
content_length = int(info["content-length"])
except:
content_length = 0
bytes_read = 0
while True:
buf = remote.read(GET_BLOCK_SIZE)
if not buf:
# EOF
break
bytes_read += len(buf)
fileobj.write(buf)
if progress_hook:
progress_hook(content_length, bytes_read)
remote.close()
fileobj.flush()
return bytes_read, info
if __name__ == "__main__":
import sys
try:
get(sys.argv[1], sys.stdout)
except Exception as err:
print("ERROR: %s" % (err))