neutron-vpp-mapper/src/main/java/org/opendaylight/groupbasedpolicy/neutron/vpp/mapper/processors/PortHandler.java

   1 /*\r
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.\r
   3  *\r
   4  * This program and the accompanying materials are made available under the\r
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,\r
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html\r
   7  */\r
   8 \r
   9 package org.opendaylight.groupbasedpolicy.neutron.vpp.mapper.processors;\r
  10 \r
  11 import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;\r
  12 import org.opendaylight.controller.md.sal.binding.api.DataBroker;\r
  13 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;\r
  14 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;\r
  15 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;\r
  16 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;\r
  17 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;\r
  18 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;\r
  19 import org.opendaylight.groupbasedpolicy.neutron.vpp.mapper.SocketInfo;\r
  20 import org.opendaylight.groupbasedpolicy.util.DataStoreHelper;\r
  21 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;\r
  22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;\r
  23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.PhysAddress;\r
  24 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;\r
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.UniqueId;\r
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.Mappings;\r
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.GbpByNeutronMappings;\r
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.gbp.by.neutron.mappings.BaseEndpointsByPorts;\r
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.gbp.by.neutron.mappings.base.endpoints.by.ports.BaseEndpointByPort;\r
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.gbp.by.neutron.mappings.base.endpoints.by.ports.BaseEndpointByPortKey;\r
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.Config;\r
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.VppEndpoint;\r
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.VppEndpointBuilder;\r
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.VppEndpointKey;\r
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.LoopbackCase;\r
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.LoopbackCaseBuilder;\r
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.TapCase;\r
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.TapCaseBuilder;\r
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.VhostUserCaseBuilder;\r
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.binding.rev150712.PortBindingExtension;\r
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.binding.rev150712.binding.attributes.VifDetails;\r
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.Routers;\r
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.routers.Router;\r
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.routers.RouterKey;\r
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.port.attributes.FixedIps;\r
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.Ports;\r
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.ports.Port;\r
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.ports.PortKey;\r
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.rev150712.Neutron;\r
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.Subnets;\r
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.subnets.Subnet;\r
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.subnets.SubnetKey;\r
  53 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;\r
  54 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;\r
  55 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;\r
  56 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;\r
  57 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;\r
  58 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;\r
  59 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;\r
  60 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;\r
  61 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.InstanceIdentifierBuilder;\r
  62 import org.slf4j.Logger;\r
  63 import org.slf4j.LoggerFactory;\r
  64 \r
  65 import com.google.common.annotations.VisibleForTesting;\r
  66 import com.google.common.base.Optional;\r
  67 \r
  68 import javax.annotation.Nullable;\r
  69 import java.util.Collections;\r
  70 import java.util.List;\r
  71 \r
  72 public class PortHandler implements TransactionChainListener {\r
  73 \r
  74     private static final Logger LOG = LoggerFactory.getLogger(MappingProvider.class);\r
  75 \r
  76     private static final String COMPUTE_OWNER = "compute";\r
  77     private static final String DHCP_OWNER = "dhcp";\r
  78     private static final String ROUTER_OWNER = "network:router_interface";\r
  79     private static final String[] SUPPORTED_DEVICE_OWNERS = {COMPUTE_OWNER, DHCP_OWNER, ROUTER_OWNER};\r
  80     private static final String VHOST_USER = "vhostuser";\r
  81     private static final String NETCONF_TOPOLOGY_ID = "topology-netconf";\r
  82     private static final String VPP_INTERFACE_NAME_PREFIX = "neutron_port_";\r
  83     private static final String TAP_PORT_NAME_PREFIX = "tap";\r
  84     private static final String RT_PORT_NAME_PREFIX = "qr-";\r
  85 \r
  86     private BindingTransactionChain transactionChain;\r
  87     private DataBroker dataBroker;\r
  88     private SocketInfo socketInfo;\r
  89 \r
  90     PortHandler(DataBroker dataBroker, SocketInfo socketInfo) {\r
  91         this.dataBroker = dataBroker;\r
  92         this.socketInfo = socketInfo;\r
  93         transactionChain = this.dataBroker.createTransactionChain(this);\r
  94     }\r
  95 \r
  96     void processCreated(Port port) {\r
  97         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
  98         Optional<BaseEndpointByPort> optBaseEpByPort = DataStoreHelper.readFromDs(LogicalDatastoreType.OPERATIONAL,\r
  99                 createBaseEpByPortIid(port.getUuid()), rTx);\r
 100         rTx.close();\r
 101         if (!optBaseEpByPort.isPresent()) {\r
 102             return;\r
 103         }\r
 104         processCreatedData(port, optBaseEpByPort.get());\r
 105     }\r
 106 \r
 107     void processCreated(BaseEndpointByPort bebp) {\r
 108         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 109         Optional<Port> optPort = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION,\r
 110                 createPortIid(bebp.getPortId()), rTx);\r
 111         rTx.close();\r
 112         if (!optPort.isPresent()) {\r
 113             return;\r
 114         }\r
 115         processCreatedData(optPort.get(), bebp);\r
 116     }\r
 117 \r
 118     @VisibleForTesting\r
 119     void processCreatedData(Port port, BaseEndpointByPort bebp) {\r
 120         if (isValidVhostUser(port)) {\r
 121             VppEndpoint vppEp = buildVppEndpoint(port, bebp);\r
 122             writeVppEndpoint(createVppEndpointIid(vppEp.getKey()), vppEp);\r
 123             LOG.debug("Created vpp-endpoint {}", vppEp);\r
 124         }\r
 125     }\r
 126 \r
 127     private boolean isValidVhostUser(Port port) {\r
 128         PortBindingExtension portBindingExt = port.getAugmentation(PortBindingExtension.class);\r
 129         if (portBindingExt != null) {\r
 130             String vifType = portBindingExt.getVifType();\r
 131             String deviceOwner = port.getDeviceOwner();\r
 132             if (vifType != null && deviceOwner != null) {\r
 133                 if (vifType.contains(VHOST_USER)) {\r
 134                     for (String supportedDeviceOwner : SUPPORTED_DEVICE_OWNERS) {\r
 135                         if (deviceOwner.contains(supportedDeviceOwner)) {\r
 136                             return true;\r
 137                         }\r
 138                     }\r
 139                 }\r
 140             }\r
 141         }\r
 142         return false;\r
 143     }\r
 144 \r
 145     void processUpdated(Port original, Port delta) {\r
 146         if (!isUpdateNeeded(original, delta)){\r
 147             LOG.trace("Port update skipped, port didn`t change. before {}, after: {}" , original, delta);\r
 148             return;\r
 149         }\r
 150 \r
 151         LOG.trace("Updating port before: {}, after: {}" , original, delta);\r
 152         if (isValidVhostUser(original)) {\r
 153             ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 154             Optional<BaseEndpointByPort> optBebp = DataStoreHelper.readFromDs(LogicalDatastoreType.OPERATIONAL,\r
 155                     createBaseEpByPortIid(original.getUuid()), rTx);\r
 156             rTx.close();\r
 157             if (!optBebp.isPresent()) {\r
 158                 return;\r
 159             }\r
 160             LOG.trace("Updating port - deleting old port {}" , optBebp.get().getPortId());\r
 161             processDeleted(optBebp.get());\r
 162         }\r
 163         LOG.trace("Updating port - creating new port {}" , delta.getUuid());\r
 164         processCreated(delta);\r
 165     }\r
 166 \r
 167     private boolean isUpdateNeeded(Port oldPort, Port newPort) {\r
 168         //TODO fix this to better support update of ports for VPP\r
 169         PortBindingExtension oldPortAugmentation = oldPort.getAugmentation(PortBindingExtension.class);\r
 170         PortBindingExtension newPortAugmentation = newPort.getAugmentation(PortBindingExtension.class);\r
 171 \r
 172         List<VifDetails> vifDetails = oldPortAugmentation.getVifDetails();\r
 173 \r
 174         if (newPortAugmentation == null) {\r
 175             LOG.trace("Port {} is no longer a vhost type port, updating port...");\r
 176             return true;\r
 177         }\r
 178 \r
 179         if (!oldPortAugmentation.getHostId().equals(newPortAugmentation.getHostId()) ||\r
 180             nullToEmpty(vifDetails).size() != nullToEmpty(newPortAugmentation.getVifDetails()).size()) {\r
 181             return true;\r
 182         }\r
 183 \r
 184         for (VifDetails vifDetail : nullToEmpty(vifDetails)) {\r
 185             //check if vhostuser_socket, vhostuser_mode and port_filter are changed\r
 186             if (!newPortAugmentation.getVifDetails().contains(vifDetail))\r
 187                 return true;\r
 188         }\r
 189         return false;\r
 190     }\r
 191 \r
 192     void processDeleted(BaseEndpointByPort bebp) {\r
 193         LOG.trace("Deleting vpp-endpoint by BaseEndpointByPort {}" , bebp);\r
 194         VppEndpointKey vppEpKey = new VppEndpointKey(bebp.getAddress(), bebp.getAddressType(), bebp.getContextId(),\r
 195                 bebp.getContextType());\r
 196         InstanceIdentifier<VppEndpoint> vppEpIid = createVppEndpointIid(vppEpKey);\r
 197         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 198         Optional<VppEndpoint> readVppEp = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION, vppEpIid, rTx);\r
 199         rTx.close();\r
 200         if (readVppEp.isPresent()) {\r
 201             writeVppEndpoint(vppEpIid, null);\r
 202             LOG.debug("Deleted vpp-endpoint {}", vppEpKey);\r
 203         }\r
 204     }\r
 205 \r
 206     private synchronized void writeVppEndpoint(InstanceIdentifier<VppEndpoint> vppEpIid, VppEndpoint vppEp) {\r
 207         WriteTransaction wTx = transactionChain.newWriteOnlyTransaction();\r
 208         if (vppEp != null) {\r
 209             wTx.put(LogicalDatastoreType.CONFIGURATION, vppEpIid, vppEp, true);\r
 210         } else {\r
 211             wTx.delete(LogicalDatastoreType.CONFIGURATION, vppEpIid);\r
 212         }\r
 213         wTx.submit();\r
 214     }\r
 215 \r
 216     @VisibleForTesting\r
 217     VppEndpoint buildVppEndpoint(Port port, BaseEndpointByPort bebp) {\r
 218         PortBindingExtension portBinding = port.getAugmentation(PortBindingExtension.class);\r
 219         VppEndpointBuilder vppEpBuilder = new VppEndpointBuilder().setDescription("neutron port")\r
 220             .setContextId(bebp.getContextId())\r
 221             .setContextType(bebp.getContextType())\r
 222             .setAddress(bebp.getAddress())\r
 223             .setAddressType(bebp.getAddressType())\r
 224             .setVppInterfaceName(VPP_INTERFACE_NAME_PREFIX + bebp.getPortId().getValue())\r
 225             .setVppNodePath(createNodeIid(new NodeId(portBinding.getHostId())));\r
 226         if (port.getDeviceOwner().contains(COMPUTE_OWNER)) {\r
 227             String socket = socketInfo.getSocketPath() + socketInfo.getSocketPrefix() + bebp.getPortId().getValue();\r
 228             vppEpBuilder.setInterfaceTypeChoice(new VhostUserCaseBuilder().setSocket(socket).build());\r
 229         } else if (port.getDeviceOwner().contains(DHCP_OWNER) && port.getMacAddress() != null) {\r
 230             TapCase tapCase = new TapCaseBuilder().setPhysicalAddress(new PhysAddress(port.getMacAddress().getValue()))\r
 231                 .setName(createPortName(port.getUuid()))\r
 232                 .build();\r
 233             vppEpBuilder.setInterfaceTypeChoice(tapCase);\r
 234         } else if (isValidQRouterPort(port)) {\r
 235             TapCase tapCase = new TapCaseBuilder().setPhysicalAddress(new PhysAddress(port.getMacAddress().getValue()))\r
 236                     .setName(createQRouterPortName(port.getUuid()))\r
 237                     .build();\r
 238             vppEpBuilder.setInterfaceTypeChoice(tapCase);\r
 239         } else if (isValidVppRouterPort(port)) {\r
 240             vppEpBuilder.setInterfaceTypeChoice(getLoopbackCase(port));\r
 241         }\r
 242         return vppEpBuilder.build();\r
 243     }\r
 244 \r
 245     private LoopbackCase getLoopbackCase(Port port) {\r
 246         LoopbackCaseBuilder loopbackCase = new LoopbackCaseBuilder()\r
 247             .setPhysAddress(new PhysAddress(port.getMacAddress().getValue()));\r
 248         Optional<FixedIps> fixedIpsOptional = resolveFirstFixedIps(port);\r
 249         if(fixedIpsOptional.isPresent() && fixedIpsOptional.get().getIpAddress() != null){\r
 250             loopbackCase.setIpAddress(fixedIpsOptional.get().getIpAddress());\r
 251             ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 252             Optional<Subnet> subnetOptional =\r
 253                 DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION,\r
 254                     InstanceIdentifier.builder(Neutron.class)\r
 255                         .child(Subnets.class)\r
 256                         .child(Subnet.class, new SubnetKey(fixedIpsOptional.get().getSubnetId()))\r
 257                         .build(), rTx);\r
 258             if (subnetOptional.isPresent()) {\r
 259                 Ipv4Prefix ipv4Prefix = subnetOptional.get().getCidr().getIpv4Prefix();\r
 260                 loopbackCase.setIpPrefix(new IpPrefix(ipv4Prefix));\r
 261             } else {\r
 262                 LOG.warn("IpPrefix for loopback port: {} was not set.", port);\r
 263             }\r
 264             if (loopbackCase.getIpAddress() != null && loopbackCase.getIpPrefix() != null) {\r
 265                 loopbackCase.setBvi(true);\r
 266                 LOG.trace("Creating loopback BVI interface: {} for VPP router port: {}.", loopbackCase, port);\r
 267             }\r
 268 \r
 269         } else {\r
 270             LOG.warn("IpAddress for loopback port: {} was not set.", port);\r
 271         }\r
 272         return loopbackCase.build();\r
 273     }\r
 274 \r
 275     /**\r
 276      * If Qrouter (L3 Agent) is in use, any of Openstack neutron routers is not going be mapped\r
 277      * to ODL neutron.\r
 278      */\r
 279     private boolean isValidQRouterPort(Port port) {\r
 280         Optional<Router> optRouter = getRouterOptional(port);\r
 281         return !optRouter.isPresent() && port.getDeviceOwner().contains(ROUTER_OWNER)\r
 282                 && port.getMacAddress() != null;\r
 283     }\r
 284 \r
 285     private boolean isValidVppRouterPort(Port port) {\r
 286         Optional<Router> optRouter = getRouterOptional(port);\r
 287         return optRouter.isPresent() && port.getDeviceOwner().contains(ROUTER_OWNER)\r
 288             && port.getMacAddress() != null;\r
 289     }\r
 290 \r
 291     private Optional<Router> getRouterOptional(Port port) {\r
 292         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 293         InstanceIdentifier<Router> routerIid = InstanceIdentifier.builder(Neutron.class)\r
 294             .child(Routers.class)\r
 295             .child(Router.class, new RouterKey(new Uuid(port.getDeviceId())))\r
 296             .build();\r
 297         Optional<Router> optRouter = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION, routerIid, rTx);\r
 298         rTx.close();\r
 299         return optRouter;\r
 300     }\r
 301 \r
 302     public static Optional<FixedIps> resolveFirstFixedIps(Port port) {\r
 303         List<FixedIps> fixedIps = port.getFixedIps();\r
 304         if (fixedIps != null && !fixedIps.isEmpty()) {\r
 305             return Optional.of(fixedIps.get(0));\r
 306         }\r
 307         return Optional.absent();\r
 308     }\r
 309 \r
 310     private String createPortName(Uuid portUuid) {\r
 311         String tapPortName;\r
 312         String uuid = portUuid.getValue();\r
 313         if (uuid != null && uuid.length() >= 12) {\r
 314             tapPortName = TAP_PORT_NAME_PREFIX + uuid.substring(0, 11);\r
 315         } else {\r
 316             tapPortName = TAP_PORT_NAME_PREFIX + uuid;\r
 317         }\r
 318         return tapPortName;\r
 319     }\r
 320 \r
 321     private String createQRouterPortName(Uuid portUuid) {\r
 322         String tapPortName;\r
 323         String uuid = portUuid.getValue();\r
 324         if (uuid != null && uuid.length() >= 12) {\r
 325             tapPortName = RT_PORT_NAME_PREFIX + uuid.substring(0, 11);\r
 326         } else {\r
 327             tapPortName = RT_PORT_NAME_PREFIX + uuid;\r
 328         }\r
 329         return tapPortName;\r
 330     }\r
 331 \r
 332     private InstanceIdentifier<Node> createNodeIid(NodeId nodeId) {\r
 333         return InstanceIdentifier.builder(NetworkTopology.class)\r
 334             .child(Topology.class, new TopologyKey(new TopologyId(NETCONF_TOPOLOGY_ID)))\r
 335             .child(Node.class, new NodeKey(nodeId))\r
 336             .build();\r
 337     }\r
 338 \r
 339     private InstanceIdentifier<VppEndpoint> createVppEndpointIid(VppEndpointKey vppEpKey) {\r
 340         return InstanceIdentifier.builder(Config.class).child(VppEndpoint.class, vppEpKey).build();\r
 341     }\r
 342 \r
 343     private InstanceIdentifier<BaseEndpointByPort> createBaseEpByPortIid(Uuid uuid) {\r
 344         return createBaseEpByPortIid(new UniqueId(uuid.getValue()));\r
 345     }\r
 346 \r
 347     private InstanceIdentifier<BaseEndpointByPort> createBaseEpByPortIid(UniqueId uuid) {\r
 348         return InstanceIdentifier.builder(Mappings.class)\r
 349             .child(GbpByNeutronMappings.class)\r
 350             .child(BaseEndpointsByPorts.class)\r
 351             .child(BaseEndpointByPort.class, new BaseEndpointByPortKey(uuid))\r
 352             .build();\r
 353     }\r
 354 \r
 355     InstanceIdentifier<Port> createWildcartedPortIid() {\r
 356         return portsIid().child(Port.class).build();\r
 357     }\r
 358 \r
 359     private InstanceIdentifier<Port> createPortIid(UniqueId uuid) {\r
 360         return portsIid().child(Port.class, new PortKey(new Uuid(uuid.getValue()))).build();\r
 361     }\r
 362 \r
 363     private InstanceIdentifierBuilder<Ports> portsIid() {\r
 364         return InstanceIdentifier.builder(Neutron.class).child(Ports.class);\r
 365     }\r
 366 \r
 367     @Override\r
 368     public void onTransactionChainFailed(TransactionChain<?, ?> chain, AsyncTransaction<?, ?> transaction,\r
 369             Throwable cause) {\r
 370         LOG.error("Transaction chain failed. {} \nTransaction which caused the chain to fail {}", cause.getMessage(),\r
 371                 transaction, cause);\r
 372         transactionChain.close();\r
 373         transactionChain = dataBroker.createTransactionChain(this);\r
 374     }\r
 375 \r
 376     @Override\r
 377     public void onTransactionChainSuccessful(TransactionChain<?, ?> chain) {\r
 378         LOG.trace("Transaction chain was successful. {}", chain);\r
 379     }\r
 380 \r
 381     private <T> List<T> nullToEmpty(@Nullable List<T> list) {\r
 382         return list == null ? Collections.emptyList() : list;\r
 383     }\r
 384 }\r