Synnefo » snf-image

#!/usr/bin/env python

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"""

A tool that connects to the Pithos backend and returns the size and contents

of a pithos object.

Since the backend does not have a "root" account we use the account given in

the URL as the user when connecting to the backend.

"""

from optparse import OptionParser

from sys import exit, stdout

from pithos.backends.modular import ModularBackend

parser = OptionParser(usage='%prog [options] <URL>')

parser.add_option('--db', dest='db', metavar='URI',

        help='SQLAlchemy URI of the database [REQUIRED]')

parser.add_option('--data', dest='data', metavar='DIR',

        help='path to the directory where data are stored [REQUIRED]')

parser.add_option('-s', action='store_true', dest='size', default=False,

        help='print file size and exit')

def urlsplit(url):

    """Returns (accout, container, object) from a location string"""

    assert url.startswith('pithos://'), "Invalid URL"

    t = url.split('/', 4)

    assert len(t) == 5, "Invalid URL"

    return t[2:5]

def print_size(backend, url):

    """Writes object's size to stdout."""

    account, container, object = urlsplit(url)

    meta = backend.get_object_meta(account, account, container, object)

    print meta['bytes']

def print_data(backend, url):

    """Writes object's size to stdout."""

    account, container, object = urlsplit(url)

    size, hashmap = backend.get_object_hashmap(account, account, container,

            object)

    for hash in hashmap:

        block = backend.get_block(hash)

        stdout.write(block)

def main():

    options, args = parser.parse_args()

    if len(args) != 1 or not options.db or not options.data:

        parser.print_help()

        exit(1)

    url = args[0]

    backend = ModularBackend(None, options.db, None, options.data)

    if options.size:

        print_size(backend, url)

    else:

        print_data(backend, url)

if __name__ == '__main__':

    main()