swift/bin/swift-get-nodes

#!/usr/bin/env python
# Copyright (c) 2010-2012 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import optparse
import sys
import urllib

from swift.common.ring import Ring
from swift.common.utils import hash_path


parser = optparse.OptionParser()
parser.add_option('-a', '--all', action='store_true',
                  help='Show all handoff nodes')
parser.add_option('-p', '--partition', metavar='PARTITION',
                  help='Show nodes for a given partition')
(options, args) = parser.parse_args()

if (len(args) < 2 or len(args) > 4) and \
   (options.partition is None or not args):
    print 'Usage: %s [-a] <ring.gz> <account> [<container>] [<object>]' \
        % sys.argv[0]
    print '   Or: %s [-a] <ring.gz> -p partition' % sys.argv[0]
    print '   Note: account, container, object can also be a single arg ' \
        'separated by /'
    print 'Shows the nodes responsible for the item specified.'
    print 'Example:'
    print '    $ %s /etc/swift/account.ring.gz MyAccount' % sys.argv[0]
    print '    Partition 5743883'
    print '    Hash 96ae332a60b58910784e4417a03e1ad0'
    print '    10.1.1.7:8000 sdd1'
    print '    10.1.9.2:8000 sdb1'
    print '    10.1.5.5:8000 sdf1'
    print '    10.1.5.9:8000 sdt1 # [Handoff]'
    sys.exit(1)

if len(args) == 2 and '/' in args[1]:
    # Parse single path arg, as noted in above help text.
    path = args[1].lstrip('/')
    args = [args[0]] + [p for p in path.split('/', 2) if p]

ringloc = None
account = None
container = None
obj = None

if len(args) == 4:
    # Account, Container and Object
    ring_file, account, container, obj = args
    ring = Ring(ring_file)
    hash_str = hash_path(account, container, obj)
    part, nodes = ring.get_nodes(account, container, obj)
    target = "%s/%s/%s" % (account, container, obj)
    loc = 'objects'
elif len(args) == 3:
    # Account, Container
    ring_file, account, container = args
    ring = Ring(ring_file)
    hash_str = hash_path(account, container)
    part, nodes = ring.get_nodes(account, container)
    target = "%s/%s" % (account, container)
    loc = 'containers'
elif len(args) == 2:
    # Account
    ring_file, account = args
    ring = Ring(ring_file)
    hash_str = hash_path(account)
    part, nodes = ring.get_nodes(account)
    target = "%s" % (account)
    loc = 'accounts'
elif len(args) == 1:
    # Partition
    ring_file = args[0]
    ring = Ring(ring_file)
    hash_str = None
    part = int(options.partition)
    nodes = ring.get_part_nodes(part)
    target = ''
    loc = ring_file.rsplit('/', 1)[-1].split('.', 1)[0]
    if loc in ('account', 'container', 'object'):
        loc += 's'
    else:
        loc = '<type>'

more_nodes = []
for more_node in ring.get_more_nodes(part):
    more_nodes.append(more_node)
    if not options.all and len(more_nodes) >= len(nodes):
        break

print '\nAccount \t%s' % account
print 'Container\t%s' % container
print 'Object   \t%s\n' % obj
print '\nPartition\t%s' % part
print 'Hash       \t%s\n' % hash_str

for node in nodes:
    print 'Server:Port Device\t%s:%s %s' % (node['ip'], node['port'],
                                            node['device'])
for mnode in more_nodes:
    print 'Server:Port Device\t%s:%s %s\t [Handoff]' \
        % (mnode['ip'], mnode['port'], mnode['device'])
print "\n"
for node in nodes:
    print 'curl -I -XHEAD "http://%s:%s/%s/%s/%s"' \
        % (node['ip'], node['port'], node['device'], part,
           urllib.quote(target))
for mnode in more_nodes:
    print 'curl -I -XHEAD "http://%s:%s/%s/%s/%s" # [Handoff]' \
        % (mnode['ip'], mnode['port'], mnode['device'], part,
           urllib.quote(target))
print "\n"
print 'Use your own device location of servers:'
print 'such as "export DEVICE=/srv/node"'
for node in nodes:
    if hash_str:
        print 'ssh %s "ls -lah ${DEVICE:-/srv/node}/%s/%s/%s/%s/%s/"' % (
            node['ip'], node['device'], loc, part, hash_str[-3:], hash_str)
    else:
        print 'ssh %s "ls -lah ${DEVICE:-/srv/node}/%s/%s/%s/"' % (
            node['ip'], node['device'], loc, part)
for mnode in more_nodes:
    if hash_str:
        print 'ssh %s "ls -lah ${DEVICE:-/srv/node}/%s/%s/%s/%s/%s/" '\
              '# [Handoff]' % (mnode['ip'], mnode['device'], loc, part,
                               hash_str[-3:], hash_str)
    else:
        print 'ssh %s "ls -lah ${DEVICE:-/srv/node}/%s/%s/%s/" # [Handoff]' % (
            mnode['ip'], mnode['device'], loc, part)