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# Copyright (c) 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.
from oslo.config import cfg
from oslo.db import exception as db_exc
from neutron.api.v2 import attributes
from neutron.common import constants
from neutron.common import exceptions as n_exc
from neutron.common import rpc as n_rpc
from neutron.common import utils
from neutron.extensions import portbindings
from neutron import manager
from neutron.openstack.common import excutils
from neutron.openstack.common import log as logging
LOG = logging.getLogger(__name__)
class DhcpRpcCallback(n_rpc.RpcCallback):
"""DHCP agent RPC callback in plugin implementations."""
# API version history:
# 1.0 - Initial version.
# 1.1 - Added get_active_networks_info, create_dhcp_port,
# and update_dhcp_port methods.
RPC_API_VERSION = '1.1'
def _get_active_networks(self, context, **kwargs):
"""Retrieve and return a list of the active networks."""
host = kwargs.get('host')
plugin = manager.NeutronManager.get_plugin()
if utils.is_extension_supported(
plugin, constants.DHCP_AGENT_SCHEDULER_EXT_ALIAS):
if cfg.CONF.network_auto_schedule:
plugin.auto_schedule_networks(context, host)
nets = plugin.list_active_networks_on_active_dhcp_agent(
context, host)
else:
filters = dict(admin_state_up=[True])
nets = plugin.get_networks(context, filters=filters)
return nets
def _port_action(self, plugin, context, port, action):
"""Perform port operations taking care of concurrency issues."""
try:
if action == 'create_port':
return plugin.create_port(context, port)
elif action == 'update_port':
return plugin.update_port(context, port['id'], port)
else:
msg = _('Unrecognized action')
raise n_exc.Invalid(message=msg)
except (db_exc.DBError, n_exc.NetworkNotFound,
n_exc.SubnetNotFound, n_exc.IpAddressGenerationFailure) as e:
with excutils.save_and_reraise_exception(reraise=False) as ctxt:
if isinstance(e, n_exc.IpAddressGenerationFailure):
# Check if the subnet still exists and if it does not,
# this is the reason why the ip address generation failed.
# In any other unlikely event re-raise
try:
subnet_id = port['port']['fixed_ips'][0]['subnet_id']
plugin.get_subnet(context, subnet_id)
except n_exc.SubnetNotFound:
pass
else:
ctxt.reraise = True
net_id = port['port']['network_id']
LOG.warn(_("Action %(action)s for network %(net_id)s "
"could not complete successfully: %(reason)s")
% {"action": action, "net_id": net_id, 'reason': e})
def get_active_networks(self, context, **kwargs):
"""Retrieve and return a list of the active network ids."""
# NOTE(arosen): This method is no longer used by the DHCP agent but is
# left so that neutron-dhcp-agents will still continue to work if
# neutron-server is upgraded and not the agent.
host = kwargs.get('host')
LOG.debug(_('get_active_networks requested from %s'), host)
nets = self._get_active_networks(context, **kwargs)
return [net['id'] for net in nets]
def get_active_networks_info(self, context, **kwargs):
"""Returns all the networks/subnets/ports in system."""
host = kwargs.get('host')
LOG.debug(_('get_active_networks_info from %s'), host)
networks = self._get_active_networks(context, **kwargs)
plugin = manager.NeutronManager.get_plugin()
filters = {'network_id': [network['id'] for network in networks]}
ports = plugin.get_ports(context, filters=filters)
filters['enable_dhcp'] = [True]
subnets = plugin.get_subnets(context, filters=filters)
for network in networks:
network['subnets'] = [subnet for subnet in subnets
if subnet['network_id'] == network['id']]
network['ports'] = [port for port in ports
if port['network_id'] == network['id']]
return networks
def get_network_info(self, context, **kwargs):
"""Retrieve and return a extended information about a network."""
network_id = kwargs.get('network_id')
host = kwargs.get('host')
LOG.debug(_('Network %(network_id)s requested from '
'%(host)s'), {'network_id': network_id,
'host': host})
plugin = manager.NeutronManager.get_plugin()
try:
network = plugin.get_network(context, network_id)
except n_exc.NetworkNotFound:
LOG.warn(_("Network %s could not be found, it might have "
"been deleted concurrently."), network_id)
return
filters = dict(network_id=[network_id])
network['subnets'] = plugin.get_subnets(context, filters=filters)
network['ports'] = plugin.get_ports(context, filters=filters)
return network
def get_dhcp_port(self, context, **kwargs):
"""Allocate a DHCP port for the host and return port information.
This method will re-use an existing port if one already exists. When a
port is re-used, the fixed_ip allocation will be updated to the current
network state. If an expected failure occurs, a None port is returned.
"""
host = kwargs.get('host')
network_id = kwargs.get('network_id')
device_id = kwargs.get('device_id')
# There could be more than one dhcp server per network, so create
# a device id that combines host and network ids
LOG.debug(_('Port %(device_id)s for %(network_id)s requested from '
'%(host)s'), {'device_id': device_id,
'network_id': network_id,
'host': host})
plugin = manager.NeutronManager.get_plugin()
retval = None
filters = dict(network_id=[network_id])
subnets = dict([(s['id'], s) for s in
plugin.get_subnets(context, filters=filters)])
dhcp_enabled_subnet_ids = [s['id'] for s in
subnets.values() if s['enable_dhcp']]
try:
filters = dict(network_id=[network_id], device_id=[device_id])
ports = plugin.get_ports(context, filters=filters)
if ports:
# Ensure that fixed_ips cover all dhcp_enabled subnets.
port = ports[0]
for fixed_ip in port['fixed_ips']:
if fixed_ip['subnet_id'] in dhcp_enabled_subnet_ids:
dhcp_enabled_subnet_ids.remove(fixed_ip['subnet_id'])
port['fixed_ips'].extend(
[dict(subnet_id=s) for s in dhcp_enabled_subnet_ids])
retval = plugin.update_port(context, port['id'],
dict(port=port))
except n_exc.NotFound as e:
LOG.warning(e)
if retval is None:
# No previous port exists, so create a new one.
LOG.debug(_('DHCP port %(device_id)s on network %(network_id)s '
'does not exist on %(host)s'),
{'device_id': device_id,
'network_id': network_id,
'host': host})
try:
network = plugin.get_network(context, network_id)
except n_exc.NetworkNotFound:
LOG.warn(_("Network %s could not be found, it might have "
"been deleted concurrently."), network_id)
return
port_dict = dict(
admin_state_up=True,
device_id=device_id,
network_id=network_id,
tenant_id=network['tenant_id'],
mac_address=attributes.ATTR_NOT_SPECIFIED,
name='',
device_owner=constants.DEVICE_OWNER_DHCP,
fixed_ips=[dict(subnet_id=s) for s in dhcp_enabled_subnet_ids])
retval = self._port_action(plugin, context, {'port': port_dict},
'create_port')
if not retval:
return
# Convert subnet_id to subnet dict
for fixed_ip in retval['fixed_ips']:
subnet_id = fixed_ip.pop('subnet_id')
fixed_ip['subnet'] = subnets[subnet_id]
return retval
def release_dhcp_port(self, context, **kwargs):
"""Release the port currently being used by a DHCP agent."""
host = kwargs.get('host')
network_id = kwargs.get('network_id')
device_id = kwargs.get('device_id')
LOG.debug(_('DHCP port deletion for %(network_id)s request from '
'%(host)s'),
{'network_id': network_id, 'host': host})
plugin = manager.NeutronManager.get_plugin()
plugin.delete_ports_by_device_id(context, device_id, network_id)
def release_port_fixed_ip(self, context, **kwargs):
"""Release the fixed_ip associated the subnet on a port."""
host = kwargs.get('host')
network_id = kwargs.get('network_id')
device_id = kwargs.get('device_id')
subnet_id = kwargs.get('subnet_id')
LOG.debug(_('DHCP port remove fixed_ip for %(subnet_id)s request '
'from %(host)s'),
{'subnet_id': subnet_id, 'host': host})
plugin = manager.NeutronManager.get_plugin()
filters = dict(network_id=[network_id], device_id=[device_id])
ports = plugin.get_ports(context, filters=filters)
if ports:
port = ports[0]
fixed_ips = port.get('fixed_ips', [])
for i in range(len(fixed_ips)):
if fixed_ips[i]['subnet_id'] == subnet_id:
del fixed_ips[i]
break
plugin.update_port(context, port['id'], dict(port=port))
def update_lease_expiration(self, context, **kwargs):
"""Release the fixed_ip associated the subnet on a port."""
# NOTE(arosen): This method is no longer used by the DHCP agent but is
# left so that neutron-dhcp-agents will still continue to work if
# neutron-server is upgraded and not the agent.
host = kwargs.get('host')
LOG.warning(_('Updating lease expiration is now deprecated. Issued '
'from host %s.'), host)
def create_dhcp_port(self, context, **kwargs):
"""Create and return dhcp port information.
If an expected failure occurs, a None port is returned.
"""
host = kwargs.get('host')
port = kwargs.get('port')
LOG.debug(_('Create dhcp port %(port)s '
'from %(host)s.'),
{'port': port,
'host': host})
port['port']['device_owner'] = constants.DEVICE_OWNER_DHCP
port['port'][portbindings.HOST_ID] = host
if 'mac_address' not in port['port']:
port['port']['mac_address'] = attributes.ATTR_NOT_SPECIFIED
plugin = manager.NeutronManager.get_plugin()
return self._port_action(plugin, context, port, 'create_port')
def update_dhcp_port(self, context, **kwargs):
"""Update the dhcp port."""
host = kwargs.get('host')
port = kwargs.get('port')
port['id'] = kwargs.get('port_id')
LOG.debug(_('Update dhcp port %(port)s '
'from %(host)s.'),
{'port': port,
'host': host})
plugin = manager.NeutronManager.get_plugin()
return self._port_action(plugin, context, port, 'update_port')
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