Commit fa7285cf authored by Giorgos Verigakis's avatar Giorgos Verigakis
Browse files

Add pithcat tool

It connects to a Pithos backend and either fetches
the data of a file or returns its size.

Refs #1745
parent de0cc3e9
#!/usr/bin/env python
# Copyright 2011 GRNET S.A. All rights reserved.
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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()
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