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nova /bin /nova-dhcpbridge

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#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# 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
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# 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.
"""
Handle lease database updates from DHCP servers.
"""
import gettext
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import os
import sys
# If ../nova/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
os.pardir,
os.pardir))
if os.path.exists(os.path.join(possible_topdir, 'nova', '__init__.py')):
sys.path.insert(0, possible_topdir)
gettext.install('nova', unicode=1)
from nova import context
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from nova import db
from nova import flags
from nova import log as logging
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from nova import rpc
from nova import utils
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from nova.network import linux_net
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FLAGS = flags.FLAGS
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flags.DECLARE('auth_driver', 'nova.auth.manager')
flags.DECLARE('network_size', 'nova.network.manager')
flags.DECLARE('num_networks', 'nova.network.manager')
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flags.DECLARE('update_dhcp_on_disassociate', 'nova.network.manager')
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LOG = logging.getLogger('nova-dhcpbridge')
if FLAGS.verbose:
LOG.setLevel(logging.DEBUG)
def add_lease(mac, ip_address, _hostname, _interface):
"""Set the IP that was assigned by the DHCP server."""
if FLAGS.fake_rabbit:
LOG.debug("leasing ip")
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network_manager = utils.import_object(FLAGS.network_manager)
network_manager.lease_fixed_ip(context.get_admin_context(),
mac,
ip_address)
else:
rpc.cast(context.get_admin_context(),
"%s.%s" % (FLAGS.network_topic, FLAGS.host),
{"method": "lease_fixed_ip",
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"args": {"mac": mac,
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"address": ip_address}})
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def old_lease(mac, ip_address, hostname, interface):
"""Update just as add lease."""
LOG.debug("Adopted old lease or got a change of mac/hostname")
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add_lease(mac, ip_address, hostname, interface)
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def del_lease(mac, ip_address, _hostname, _interface):
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"""Called when a lease expires."""
if FLAGS.fake_rabbit:
LOG.debug("releasing ip")
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network_manager = utils.import_object(FLAGS.network_manager)
network_manager.release_fixed_ip(context.get_admin_context(),
mac,
ip_address)
else:
rpc.cast(context.get_admin_context(),
"%s.%s" % (FLAGS.network_topic, FLAGS.host),
{"method": "release_fixed_ip",
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"args": {"mac": mac,
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"address": ip_address}})
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def init_leases(interface):
"""Get the list of hosts for an interface."""
ctxt = context.get_admin_context()
network_ref = db.network_get_by_bridge(ctxt, interface)
return linux_net.get_dhcp_hosts(ctxt, network_ref['id'])
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def main():
"""Parse environment and arguments and call the approproate action."""
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flagfile = os.environ.get('FLAGFILE', FLAGS.dhcpbridge_flagfile)
utils.default_flagfile(flagfile)
argv = FLAGS(sys.argv)
logging.basicConfig()
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interface = os.environ.get('DNSMASQ_INTERFACE', 'br0')
if int(os.environ.get('TESTING', '0')):
FLAGS.fake_rabbit = True
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FLAGS.network_size = 16
In preparation for XenAPI support, refactor the interface between nova.compute and the hypervisor (i.e. libvirt). compute.node is no longer coupled tightly with libvirt. Instead, hypervisor connections are handled through a simple abstract interface. This has the additional advantage that there is no need to riddle the code with FLAGS.fake_libvirt checks, as we now have an interface behind which we can mock. The libvirt-specific code, and the fakevirt code used for unit tests, have moved into nova.virt. The fake_libvirt flag has been replaced with a connection_type flag, that will allow us to specify different connection types. The disk image handling (S3 or local disk image fetch) has moved into nova.virt.images, where it will be easier to share between connection types. The power_state values (Instance.RUNNING etc) and the INSTANCE_TYPES dictionary have moved into their own files (nova.compute.instance_types and nova.compute.power_state) so that we can share them without mutual dependencies between nova.compute.node and nova.virt.libvirt_conn.
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FLAGS.connection_type = 'fake'
FLAGS.fake_network = True
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FLAGS.auth_driver = 'nova.auth.dbdriver.DbDriver'
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FLAGS.num_networks = 5
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path = os.path.abspath(os.path.join(os.path.dirname(__file__),
'..',
'nova.sqlite'))
FLAGS.sql_connection = 'sqlite:///%s' % path
action = argv[1]
if action in ['add', 'del', 'old']:
mac = argv[2]
ip = argv[3]
hostname = argv[4]
LOG.debug("Called %s for mac %s with ip %s and "
"hostname %s on interface %s",
action, mac, ip, hostname, interface)
globals()[action + '_lease'](mac, ip, hostname, interface)
else:
print init_leases(interface)
if __name__ == "__main__":
main()