pithcat 2.71 KB
Newer Older
Giorgos Verigakis's avatar
Giorgos Verigakis committed
1
2
#!/usr/bin/env python

3
# Copyright (C) 2011 GRNET S.A.
Giorgos Verigakis's avatar
Giorgos Verigakis committed
4
#
5
6
7
8
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
Giorgos Verigakis's avatar
Giorgos Verigakis committed
9
#
10
11
12
13
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
Giorgos Verigakis's avatar
Giorgos Verigakis committed
14
#
15
16
17
18
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
Giorgos Verigakis's avatar
Giorgos Verigakis committed
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

"""
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)
56
    meta = backend.get_object_meta(account, account, container, object, None)
Giorgos Verigakis's avatar
Giorgos Verigakis committed
57
58
59
60
61
62
63
64
65
66
67
    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)
Giorgos Verigakis's avatar
Giorgos Verigakis committed
68
69
        if len(block) > size:
            block = block[:size]
Giorgos Verigakis's avatar
Giorgos Verigakis committed
70
        stdout.write(block)
Giorgos Verigakis's avatar
Giorgos Verigakis committed
71
        size -= len(block)
Giorgos Verigakis's avatar
Giorgos Verigakis committed
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89


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()