# Copyright (c) 2016 IBM # 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 # 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 neutron_lib.api import validators from neutron_lib.db import model_base from neutron_lib import exceptions as n_exc from oslo_config import cfg from oslo_log import log as logging import sqlalchemy as sa from sqlalchemy import orm from neutron._i18n import _, _LE from neutron.common import utils from neutron.db import db_base_plugin_v2 from neutron.db.models import l3 as l3_models from neutron.db import models_v2 from neutron.extensions import dns from neutron.extensions import l3 from neutron.services.externaldns import driver LOG = logging.getLogger(__name__) class NetworkDNSDomain(model_base.BASEV2): network_id = sa.Column(sa.String(36), sa.ForeignKey('networks.id', ondelete="CASCADE"), primary_key=True, index=True) dns_domain = sa.Column(sa.String(255), nullable=False) # Add a relationship to the Network model in order to instruct # SQLAlchemy to eagerly load this association network = orm.relationship(models_v2.Network, backref=orm.backref("dns_domain", lazy='joined', uselist=False, cascade='delete')) class FloatingIPDNS(model_base.BASEV2): __tablename__ = 'floatingipdnses' floatingip_id = sa.Column(sa.String(36), sa.ForeignKey('floatingips.id', ondelete="CASCADE"), primary_key=True, index=True) dns_name = sa.Column(sa.String(255), nullable=False) dns_domain = sa.Column(sa.String(255), nullable=False) published_dns_name = sa.Column(sa.String(255), nullable=False) published_dns_domain = sa.Column(sa.String(255), nullable=False) # Add a relationship to the FloatingIP model in order to instruct # SQLAlchemy to eagerly load this association floatingip = orm.relationship(l3_models.FloatingIP, backref=orm.backref("dns", lazy='joined', uselist=False, cascade='delete')) class PortDNS(model_base.BASEV2): __tablename__ = 'portdnses' port_id = sa.Column(sa.String(36), sa.ForeignKey('ports.id', ondelete="CASCADE"), primary_key=True, index=True) current_dns_name = sa.Column(sa.String(255), nullable=False) current_dns_domain = sa.Column(sa.String(255), nullable=False) previous_dns_name = sa.Column(sa.String(255), nullable=False) previous_dns_domain = sa.Column(sa.String(255), nullable=False) dns_name = sa.Column(sa.String(255), nullable=False) # Add a relationship to the Port model in order to instruct # SQLAlchemy to eagerly load this association port = orm.relationship(models_v2.Port, backref=orm.backref("dns", lazy='joined', uselist=False, cascade='delete')) class DNSActionsData(object): def __init__(self, current_dns_name=None, current_dns_domain=None, previous_dns_name=None, previous_dns_domain=None): self.current_dns_name = current_dns_name self.current_dns_domain = current_dns_domain self.previous_dns_name = previous_dns_name self.previous_dns_domain = previous_dns_domain class DNSDbMixin(object): """Mixin class to add DNS methods to db_base_plugin_v2.""" _dns_driver = None @property def dns_driver(self): if self._dns_driver: return self._dns_driver if not cfg.CONF.external_dns_driver: return try: self._dns_driver = driver.ExternalDNSService.get_instance() LOG.debug("External DNS driver loaded: %s", cfg.CONF.external_dns_driver) return self._dns_driver except ImportError: LOG.exception(_LE("ImportError exception occurred while loading " "the external DNS service driver")) raise dns.ExternalDNSDriverNotFound( driver=cfg.CONF.external_dns_driver) def _extend_floatingip_dict_dns(self, floatingip_res, floatingip_db): floatingip_res['dns_domain'] = '' floatingip_res['dns_name'] = '' if floatingip_db.dns: floatingip_res['dns_domain'] = floatingip_db.dns['dns_domain'] floatingip_res['dns_name'] = floatingip_db.dns['dns_name'] return floatingip_res # Register dict extend functions for floating ips db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs( l3.FLOATINGIPS, ['_extend_floatingip_dict_dns']) def _process_dns_floatingip_create_precommit(self, context, floatingip_data, req_data): # expects to be called within a plugin's session dns_domain = req_data.get(dns.DNSDOMAIN) if not validators.is_attr_set(dns_domain): return if not self.dns_driver: return dns_name = req_data[dns.DNSNAME] self._validate_floatingip_dns(dns_name, dns_domain) current_dns_name, current_dns_domain = ( self._get_requested_state_for_external_dns_service_create( context, floatingip_data, req_data)) dns_actions_data = None if current_dns_name and current_dns_domain: context.session.add(FloatingIPDNS( floatingip_id=floatingip_data['id'], dns_name=req_data[dns.DNSNAME], dns_domain=req_data[dns.DNSDOMAIN], published_dns_name=current_dns_name, published_dns_domain=current_dns_domain)) dns_actions_data = DNSActionsData( current_dns_name=current_dns_name, current_dns_domain=current_dns_domain) floatingip_data['dns_name'] = dns_name floatingip_data['dns_domain'] = dns_domain return dns_actions_data def _process_dns_floatingip_create_postcommit(self, context, floatingip_data, dns_actions_data): if not dns_actions_data: return self._add_ips_to_external_dns_service( context, dns_actions_data.current_dns_domain, dns_actions_data.current_dns_name, [floatingip_data['floating_ip_address']]) def _process_dns_floatingip_update_precommit(self, context, floatingip_data): # expects to be called within a plugin's session if not utils.is_extension_supported(self._core_plugin, dns.Dns.get_alias()): return if not self.dns_driver: return dns_data_db = context.session.query(FloatingIPDNS).filter_by( floatingip_id=floatingip_data['id']).one_or_none() if dns_data_db and dns_data_db['dns_name']: # dns_name and dns_domain assigned for floating ip. It doesn't # matter whether they are defined for internal port return current_dns_name, current_dns_domain = ( self._get_requested_state_for_external_dns_service_update( context, floatingip_data)) if dns_data_db: if (dns_data_db['published_dns_name'] != current_dns_name or dns_data_db['published_dns_domain'] != current_dns_domain): dns_actions_data = DNSActionsData( previous_dns_name=dns_data_db['published_dns_name'], previous_dns_domain=dns_data_db['published_dns_domain']) if current_dns_name and current_dns_domain: dns_data_db['published_dns_name'] = current_dns_name dns_data_db['published_dns_domain'] = current_dns_domain dns_actions_data.current_dns_name = current_dns_name dns_actions_data.current_dns_domain = current_dns_domain else: context.session.delete(dns_data_db) return dns_actions_data else: return if current_dns_name and current_dns_domain: context.session.add(FloatingIPDNS( floatingip_id=floatingip_data['id'], dns_name='', dns_domain='', published_dns_name=current_dns_name, published_dns_domain=current_dns_domain)) return DNSActionsData(current_dns_name=current_dns_name, current_dns_domain=current_dns_domain) def _process_dns_floatingip_update_postcommit(self, context, floatingip_data, dns_actions_data): if not dns_actions_data: return if dns_actions_data.previous_dns_name: self._delete_floatingip_from_external_dns_service( context, dns_actions_data.previous_dns_domain, dns_actions_data.previous_dns_name, [floatingip_data['floating_ip_address']]) if dns_actions_data.current_dns_name: self._add_ips_to_external_dns_service( context, dns_actions_data.current_dns_domain, dns_actions_data.current_dns_name, [floatingip_data['floating_ip_address']]) def _process_dns_floatingip_delete(self, context, floatingip_data): if not utils.is_extension_supported(self._core_plugin, dns.Dns.get_alias()): return dns_data_db = context.session.query(FloatingIPDNS).filter_by( floatingip_id=floatingip_data['id']).one_or_none() if dns_data_db: self._delete_floatingip_from_external_dns_service( context, dns_data_db['published_dns_domain'], dns_data_db['published_dns_name'], [floatingip_data['floating_ip_address']]) def _validate_floatingip_dns(self, dns_name, dns_domain): if dns_domain and not dns_name: msg = _("dns_domain cannot be specified without a dns_name") raise n_exc.BadRequest(resource='floatingip', msg=msg) if dns_name and not dns_domain: msg = _("dns_name cannot be specified without a dns_domain") raise n_exc.BadRequest(resource='floatingip', msg=msg) def _get_internal_port_dns_data(self, context, floatingip_data): port_dns = context.session.query(PortDNS).filter_by( port_id=floatingip_data['port_id']).one_or_none() if not (port_dns and port_dns['dns_name']): return None, None net_dns = context.session.query(NetworkDNSDomain).join( models_v2.Port, NetworkDNSDomain.network_id == models_v2.Port.network_id).filter_by( id=floatingip_data['port_id']).one_or_none() if not net_dns: return port_dns['dns_name'], None return port_dns['dns_name'], net_dns['dns_domain'] def _delete_floatingip_from_external_dns_service(self, context, dns_domain, dns_name, records): try: self.dns_driver.delete_record_set(context, dns_domain, dns_name, records) except (dns.DNSDomainNotFound, dns.DuplicateRecordSet) as e: LOG.exception(_LE("Error deleting Floating IP data from external " "DNS service. Name: '%(name)s'. Domain: " "'%(domain)s'. IP addresses '%(ips)s'. DNS " "service driver message '%(message)s'"), {"name": dns_name, "domain": dns_domain, "message": e.msg, "ips": ', '.join(records)}) def _get_requested_state_for_external_dns_service_create(self, context, floatingip_data, req_data): fip_dns_name = req_data[dns.DNSNAME] if fip_dns_name: return fip_dns_name, req_data[dns.DNSDOMAIN] if floatingip_data['port_id']: return self._get_internal_port_dns_data(context, floatingip_data) return None, None def _get_requested_state_for_external_dns_service_update(self, context, floatingip_data): if floatingip_data['port_id']: return self._get_internal_port_dns_data(context, floatingip_data) return None, None def _add_ips_to_external_dns_service(self, context, dns_domain, dns_name, records): try: self.dns_driver.create_record_set(context, dns_domain, dns_name, records) except (dns.DNSDomainNotFound, dns.DuplicateRecordSet) as e: LOG.exception(_LE("Error publishing floating IP data in external " "DNS service. Name: '%(name)s'. Domain: " "'%(domain)s'. DNS service driver message " "'%(message)s'"), {"name": dns_name, "domain": dns_domain, "message": e.msg})