bionic (1) urlgrabber.1.gz

NAME

       urlgrabber - a high-level cross-protocol url-grabber.

SYNOPSIS

       urlgrabber [OPTIONS] URL [FILE]

DESCRIPTION

       urlgrabber is a binary program and python module for fetching files. It is designed to be used in
       programs that need common (but not necessarily simple) url-fetching features.

OPTIONS

       --help, -h
           help page specifying available options to the binary program.

       --copy-local
           ignored except for file:// urls, in which case it specifies whether urlgrab should still make a copy
           of the file, or simply point to the existing copy.

       --throttle=NUMBER
           if it's an int, it's the bytes/second throttle limit. If it's a float, it is first multiplied by
           bandwidth. If throttle == 0, throttling is disabled. If None, the module-level default (which can be
           set with set_throttle) is used.

       --bandwidth=NUMBER
           the nominal max bandwidth in bytes/second. If throttle is a float and bandwidth == 0, throttling is
           disabled. If None, the module-level default (which can be set with set_bandwidth) is used.

       --range=RANGE
           a tuple of the form first_byte,last_byte describing a byte range to retrieve. Either or both of the
           values may be specified. If first_byte is None, byte offset 0 is assumed. If last_byte is None, the
           last byte available is assumed. Note that both first and last_byte values are inclusive so a range of
           (10,11) would return the 10th and 11th bytes of the resource.

       --user-agent=STR
           the user-agent string provide if the url is HTTP.

       --retry=NUMBER
           the number of times to retry the grab before bailing. If this is zero, it will retry forever. This
           was intentional... really, it was :). If this value is not supplied or is supplied but is None
           retrying does not occur.

       --retrycodes
           a sequence of errorcodes (values of e.errno) for which it should retry. See the doc on URLGrabError
           for more details on this. retrycodes defaults to -1,2,4,5,6,7 if not specified explicitly.

MODULE USE EXAMPLES

       In its simplest form, urlgrabber can be a replacement for urllib2's open, or even python's file if you're
       just reading:

             from urlgrabber import urlopen
             fo = urlopen(url)
             data = fo.read()
             fo.close()

       Here, the url can be http, https, ftp, or file. It's also pretty smart so if you just give it something
       like /tmp/foo, it will figure it out. For even more fun, you can also do:

             from urlgrabber import urlopen
             local_filename = urlgrab(url)  # grab a local copy of the file
             data = urlread(url)            # just read the data into a string

       Now, like urllib2, what's really happening here is that you're using a module-level object (called a
       grabber) that kind of serves as a default. That's just fine, but you might want to get your own private
       version for a couple of reasons:

           * it's a little ugly to modify the default grabber because you have to
             reach into the module to do it
           * you could run into conflicts if different parts of the code
             modify the default grabber and therefore expect different
             behavior

       Therefore, you're probably better off making your own. This also gives you lots of flexibility for later,
       as you'll see:

             from urlgrabber.grabber import URLGrabber
             g = URLGrabber()
             data = g.urlread(url)

       This is nice because you can specify options when you create the grabber. For example, let's turn on
       simple reget mode so that if we have part of a file, we only need to fetch the rest:

             from urlgrabber.grabber import URLGrabber
             g = URLGrabber(reget='simple')
             local_filename = g.urlgrab(url)

       The available options are listed in the module documentation, and can usually be specified as a default
       at the grabber-level or as options to the method:

           from urlgrabber.grabber import URLGrabber
           g = URLGrabber(reget='simple')
           local_filename = g.urlgrab(url, filename=None, reget=None)

AUTHORS

       Written by: Michael D. Stenner <mstenner@linux.duke.edu> Ryan Tomayko <rtomayko@naeblis.cx>

       This manual page was written by Kevin Coyner <kevin@rustybear.com> for the Debian system (but may be used
       by others). It borrows heavily on the documentation included in the urlgrabber module. Permission is
       granted to copy, distribute and/or modify this document under the terms of the GNU General Public
       License, Version 2 any later version published by the Free Software Foundation.

RESOURCES

       Main web site: http://linux.duke.edu/projects/urlgrabber/

                                                   04/09/2007                                      URLGRABBER(1)