renderers/vpp/src/main/java/org/opendaylight/groupbasedpolicy/renderer/vpp/manager/VppNodeManager.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.groupbasedpolicy.renderer.vpp.manager;
  10
  11 import static org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus.ConnectionStatus.Connected;
  12 import static org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus.ConnectionStatus.Connecting;
  13 import static org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus.ConnectionStatus.UnableToConnect;
  14
  15 import java.util.ArrayList;
  16 import java.util.Arrays;
  17 import java.util.HashMap;
  18 import java.util.List;
  19 import java.util.Map;
  20 import java.util.Objects;
  21 import java.util.stream.Collectors;
  22
  23 import javax.annotation.Nonnull;
  24 import javax.annotation.Nullable;
  25
  26 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  27 import org.opendaylight.controller.md.sal.binding.api.MountPointService;
  28 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  29 import org.opendaylight.controller.md.sal.binding.api.ReadTransaction;
  30 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  31 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
  32 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  33 import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
  34 import org.opendaylight.controller.sal.binding.api.BindingAwareBroker;
  35 import org.opendaylight.groupbasedpolicy.renderer.vpp.lisp.info.container.HostRelatedInfoContainer;
  36 import org.opendaylight.groupbasedpolicy.renderer.vpp.lisp.info.container.states.PhysicalInterfaces;
  37 import org.opendaylight.groupbasedpolicy.renderer.vpp.nat.NatUtil;
  38 import org.opendaylight.groupbasedpolicy.renderer.vpp.util.MountedDataBrokerProvider;
  39 import org.opendaylight.groupbasedpolicy.renderer.vpp.util.VppIidFactory;
  40 import org.opendaylight.groupbasedpolicy.renderer.vpp.util.VppRendererProcessingException;
  41 import org.opendaylight.groupbasedpolicy.util.DataStoreHelper;
  42 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.iana._if.type.rev140508.EthernetCsmacd;
  43 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  44 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
  45 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.Interfaces;
  46 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.Interface1;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.RendererNodes;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.renderer.nodes.RendererNode;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.renderer.nodes.RendererNodeBuilder;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.renderer.nodes.RendererNodeKey;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.VppInterfaceAugmentation;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.VppInterfaceAugmentationBuilder;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.renderers.renderer.renderer.nodes.renderer.node.PhysicalInterface;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.renderers.renderer.renderer.nodes.renderer.node.PhysicalInterfaceBuilder;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.renderers.renderer.renderer.nodes.renderer.node.PhysicalInterfaceKey;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNode;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.netconf.node.connection.status.available.capabilities.AvailableCapability;
  59 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  60 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
  61 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
  62 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  63 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  64 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  65 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
  66 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  67 import org.slf4j.Logger;
  68 import org.slf4j.LoggerFactory;
  69
  70 import com.google.common.base.Optional;
  71 import com.google.common.base.Preconditions;
  72 import com.google.common.base.Splitter;
  73 import com.google.common.base.Strings;
  74 import com.google.common.collect.Lists;
  75 import com.google.common.collect.Sets;
  76 import com.google.common.util.concurrent.CheckedFuture;
  77 import com.google.common.util.concurrent.FutureCallback;
  78 import com.google.common.util.concurrent.Futures;
  79 import com.google.common.util.concurrent.ListenableFuture;
  80 import com.google.common.util.concurrent.MoreExecutors;
  81
  82 public class VppNodeManager {
  83
  84     private static final TopologyId TOPOLOGY_ID = new TopologyId("topology-netconf");
  85     private static final Logger LOG = LoggerFactory.getLogger(VppNodeManager.class);
  86     private static final String V3PO_CAPABILITY = "(urn:opendaylight:params:xml:ns:yang:v3po?revision=2017-06-07)v3po";
  87     private static final String INTERFACES_CAPABILITY = "(urn:ietf:params:xml:ns:yang:ietf-interfaces?revision=2014-05-08)ietf-interfaces";
  88     private static final NodeId CONTROLLER_CONFIG_NODE = new NodeId("controller-config");
  89     private static final String NO_PUBLIC_INT_SPECIFIED = "unspecified";
  90     private static final String PUBLIC_INTERFACE = "public-interface";
  91     private final Map<NodeId, PhysicalInterfaceKey> extInterfaces = new HashMap<>();
  92     private final DataBroker dataBroker;
  93     private final List<String> requiredCapabilities;
  94     private final MountPointService mountService;
  95     private final HostRelatedInfoContainer hostRelatedInfoContainer = HostRelatedInfoContainer.getInstance();
  96     private final MountedDataBrokerProvider mountProvider;
  97
  98     public VppNodeManager(@Nonnull final DataBroker dataBroker,
  99             @Nonnull final BindingAwareBroker.ProviderContext session, @Nullable String physicalInterfaces) {
 100         this.dataBroker = Preconditions.checkNotNull(dataBroker);
 101         this.mountService = Preconditions.checkNotNull(session.getSALService(MountPointService.class));
 102         this.mountProvider = new MountedDataBrokerProvider(mountService, dataBroker);
 103         requiredCapabilities = initializeRequiredCapabilities();
 104         if (!Strings.isNullOrEmpty(physicalInterfaces) && !Objects.equals(physicalInterfaces, NO_PUBLIC_INT_SPECIFIED)) {
 105             loadPhysicalInterfaces(physicalInterfaces);
 106         }
 107     }
 108
 109     /**
 110      * Caches list of physical interfaces.
 111      */
 112     private void loadPhysicalInterfaces(@Nonnull String physicalInterfaces) {
 113         for (String intfOnNode : Sets.newConcurrentHashSet(Splitter.on(",").split(physicalInterfaces))) {
 114             List<String> entries = Lists.newArrayList(Splitter.on(":").split(intfOnNode));
 115             if (entries.size() != 2) {
 116                 LOG.warn("Cannot resolve {} initial configuration for physical interfaces.", intfOnNode);
 117                 continue;
 118             }
 119             NodeId nodeId = new NodeId(entries.get(0));
 120             PhysicalInterfaceKey infaceKey = new PhysicalInterfaceKey(entries.get(1));
 121             LOG.info("Interface %s on node %swill be considered as external", infaceKey, nodeId);
 122             extInterfaces.put(nodeId, infaceKey);
 123         }
 124     }
 125
 126     /**
 127      * Synchronizes nodes to DataStore based on their modification state which results in
 128      * create/update/remove of Node.
 129      * @param dataAfter data after modification
 130      * @param dataBefore data Before modification
 131      */
 132     public void syncNodes(final Node dataAfter, final Node dataBefore) {
 133         if (isControllerConfigNode(dataAfter, dataBefore)) {
 134             LOG.trace("{} is ignored by VPP-renderer", CONTROLLER_CONFIG_NODE);
 135             return;
 136         }
 137         ListenableFuture<String> syncFuture = Futures.immediateFuture(null);
 138         // New node
 139         if (dataBefore == null && dataAfter != null) {
 140             syncFuture = createNode(dataAfter);
 141         }
 142         // Connected/disconnected node
 143         else if (dataBefore != null && dataAfter != null) {
 144             syncFuture = updateNode(dataAfter);
 145         }
 146         // Removed node
 147         else if (dataBefore != null) {
 148             syncFuture = removeNode(dataBefore);
 149         }
 150         Futures.addCallback(syncFuture, new FutureCallback<String>() {
 151             @Override
 152             public void onSuccess(@Nullable String message) {
 153                 LOG.info("Node synchronization completed. {} ", message);
 154             }
 155
 156             @Override
 157             public void onFailure(@Nonnull Throwable t) {
 158                 LOG.warn("Node synchronization failed. Data before: {} after {}", dataBefore, dataAfter);
 159             }
 160         }, MoreExecutors.directExecutor());
 161     }
 162
 163     private boolean isControllerConfigNode(final Node dataAfter, final Node dataBefore) {
 164         if (dataAfter != null) {
 165             return CONTROLLER_CONFIG_NODE.equals(dataAfter.getNodeId());
 166         }
 167         return CONTROLLER_CONFIG_NODE.equals(dataBefore.getNodeId());
 168     }
 169
 170     private ListenableFuture<String> createNode(final Node node) {
 171         final String nodeId = node.getNodeId().getValue();
 172         LOG.info("Registering new node {}", nodeId);
 173         final NetconfNode netconfNode = getNodeAugmentation(node);
 174         if (netconfNode == null) {
 175             final String message = String.format("Node %s is not an netconf node", nodeId);
 176             return Futures.immediateFuture(message);
 177         }
 178         final NetconfNodeConnectionStatus.ConnectionStatus connectionStatus = netconfNode.getConnectionStatus();
 179         switch (connectionStatus) {
 180             case Connecting: {
 181                 final String message = String.format("Connecting device %s ...", nodeId);
 182                 return Futures.immediateFuture(message);
 183             }
 184             case Connected: {
 185                 return resolveConnectedNode(node, netconfNode);
 186             }
 187             case UnableToConnect: {
 188                 final String message = String.format("Connection status is unable to connect for node %s", nodeId);
 189                 return Futures.immediateFuture(message);
 190             }
 191             default: {
 192                 final String message = String.format("Unknown connection status for node %s", nodeId);
 193                 return Futures.immediateFailedFuture(new VppRendererProcessingException(message));
 194             }
 195         }
 196     }
 197
 198     private ListenableFuture<String> updateNode(final Node node) {
 199         final String nodeId = node.getNodeId().getValue();
 200         LOG.info("Updating node {}", nodeId);
 201         final NetconfNode netconfNode = getNodeAugmentation(node);
 202         if (netconfNode == null) {
 203             final String message = String.format("Node %s is not an netconf node", nodeId);
 204             return Futures.immediateFuture(message);
 205         }
 206         final NetconfNodeConnectionStatus.ConnectionStatus afterNodeStatus = netconfNode.getConnectionStatus();
 207         if (Connected.equals(afterNodeStatus)) {
 208             return resolveConnectedNode(node, netconfNode);
 209         } else if (Connecting.equals(afterNodeStatus)) {
 210             final String cause = String.format("Node %s is disconnected, removing from available nodes", nodeId);
 211             return resolveDisconnectedNode(node, cause);
 212         } else if (UnableToConnect.equals(afterNodeStatus)) {
 213             final String cause = String.format("New node %s status is unable to connect, removing from available nodes",
 214                     nodeId);
 215             return resolveDisconnectedNode(node, cause);
 216         } else {
 217             final String cause = String.format("New node status is unknown. Node %s will be removed from available nodes",
 218                     nodeId);
 219             return resolveDisconnectedNode(node, cause);
 220         }
 221     }
 222
 223     private ListenableFuture<String> removeNode(final Node node) {
 224         final String cause = String.format("Node %s is removed", node.getNodeId().getValue());
 225         return resolveDisconnectedNode(node, cause);
 226     }
 227
 228     private ListenableFuture<String> resolveConnectedNode(final Node node, final NetconfNode netconfNode) {
 229         final String nodeId = node.getNodeId().getValue();
 230         final InstanceIdentifier<Node> mountPointIid = getMountpointIid(node);
 231         final RendererNode rendererNode = remapNode(mountPointIid);
 232         if (!isCapableNetconfDevice(node, netconfNode)) {
 233             final String message = String.format("Node %s is not connected", nodeId);
 234             return Futures.immediateFuture(message);
 235         }
 236         final Optional<DataBroker> mountpoint = mountProvider.resolveDataBrokerForMountPoint(mountPointIid);
 237         if (!mountpoint.isPresent()) {
 238             final String message = String.format("Mountpoint not available for node %s", nodeId);
 239             return Futures.immediateFuture(message);
 240         }
 241         final WriteTransaction wTx = dataBroker.newWriteOnlyTransaction();
 242         wTx.put(LogicalDatastoreType.OPERATIONAL, VppIidFactory.getRendererNodeIid(rendererNode), rendererNode, true);
 243         final boolean submit = DataStoreHelper.submitToDs(wTx);
 244         if (submit) {
 245             final String message = String.format("Node %s is capable and ready", nodeId);
 246             syncPhysicalInterfacesInLocalDs(mountpoint.get(), mountPointIid);
 247             NatUtil.resolveOutboundNatInterface(mountPointIid, node.getNodeId(), extInterfaces);
 248             return Futures.immediateFuture(message);
 249         } else {
 250             final String message = String.format("Failed to resolve connected node %s", nodeId);
 251             return Futures.immediateFuture(message);
 252         }
 253     }
 254
 255     private ListenableFuture<String> resolveDisconnectedNode(final Node node, final String cause) {
 256         final InstanceIdentifier<Node> mountPointIid = getMountpointIid(node);
 257         final RendererNode rendererNode = remapNode(mountPointIid);
 258         final WriteTransaction wTx = dataBroker.newWriteOnlyTransaction();
 259         wTx.delete(LogicalDatastoreType.OPERATIONAL, VppIidFactory.getRendererNodeIid(rendererNode));
 260         final CheckedFuture<Void, TransactionCommitFailedException> checkedFuture = wTx.submit();
 261         try {
 262             checkedFuture.checkedGet();
 263             mountProvider.deleteDataBrokerForMountPoint(mountPointIid);
 264             return Futures.immediateFuture(cause);
 265         } catch (TransactionCommitFailedException e) {
 266             final String message = String.format("Failed to resolve disconnected node %s", node.getNodeId().getValue());
 267             return Futures.immediateFailedFuture(new VppRendererProcessingException(message));
 268         }
 269     }
 270
 271     private RendererNode remapNode(final InstanceIdentifier<Node> path) {
 272         final RendererNodeBuilder rendererNodeBuilder = new RendererNodeBuilder();
 273         rendererNodeBuilder.setKey(new RendererNodeKey(path)).setNodePath(path);
 274         return rendererNodeBuilder.build();
 275     }
 276
 277     private InstanceIdentifier<Node> getMountpointIid(final Node node) {
 278         return InstanceIdentifier.builder(NetworkTopology.class)
 279                 .child(Topology.class, new TopologyKey(TOPOLOGY_ID))
 280                 .child(Node.class, new NodeKey(node.getNodeId()))
 281                 .build();
 282     }
 283
 284     private boolean isCapableNetconfDevice(final Node node, final NetconfNode netconfAugmentation) {
 285         if (netconfAugmentation.getAvailableCapabilities() == null
 286                 || netconfAugmentation.getAvailableCapabilities().getAvailableCapability() == null
 287                 || netconfAugmentation.getAvailableCapabilities().getAvailableCapability().isEmpty()) {
 288             LOG.warn("Node {} does not contain any capabilities", node.getNodeId().getValue());
 289             return false;
 290         }
 291         if (!capabilityCheck(netconfAugmentation.getAvailableCapabilities().getAvailableCapability())) {
 292             LOG.warn("Node {} does not contain all capabilities required by vpp-renderer", node.getNodeId().getValue());
 293             return false;
 294         }
 295         return true;
 296     }
 297
 298     private boolean capabilityCheck(final List<AvailableCapability> capabilities) {
 299         final List<String> availableCapabilities = capabilities.stream()
 300                 .map(AvailableCapability::getCapability)
 301                 .collect(Collectors.toList());
 302         return requiredCapabilities.stream()
 303                 .allMatch(availableCapabilities::contains);
 304     }
 305
 306     private NetconfNode getNodeAugmentation(final Node node) {
 307         final NetconfNode netconfNode = node.getAugmentation(NetconfNode.class);
 308         if (netconfNode == null) {
 309             LOG.warn("Node {} is not a netconf device", node.getNodeId().getValue());
 310             return null;
 311         }
 312         return netconfNode;
 313     }
 314
 315     /**
 316      * Initialize all common capabilities required by VPP renderer. Any connected node is examined
 317      * whether it's
 318      * an appropriate device to handle configuration created by this renderer. A device must support
 319      * all capabilities
 320      * in list below.
 321      *
 322      * @return list of string representations of required capabilities
 323      */
 324     private List<String> initializeRequiredCapabilities() {
 325         // Required device capabilities
 326         String[] capabilityEntries = {V3PO_CAPABILITY, INTERFACES_CAPABILITY};
 327         return Arrays.asList(capabilityEntries);
 328     }
 329
 330     private void syncPhysicalInterfacesInLocalDs(DataBroker mountPointDataBroker, InstanceIdentifier<Node> nodeIid) {
 331         ReadWriteTransaction rwTx = dataBroker.newReadWriteTransaction();
 332         ReadOnlyTransaction rTx = mountPointDataBroker.newReadOnlyTransaction();
 333         Optional<Interfaces> readIfaces = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION,
 334                 InstanceIdentifier.create(Interfaces.class), rTx);
 335         if (readIfaces.isPresent()) {
 336             InstanceIdentifier<RendererNode> rendererNodeIid = VppIidFactory.getRendererNodesIid()
 337                 .builder()
 338                 .child(RendererNode.class, new RendererNodeKey(nodeIid))
 339                 .build();
 340             Optional<RendererNode> optRendNode = DataStoreHelper.readFromDs(LogicalDatastoreType.OPERATIONAL,
 341                     rendererNodeIid, rwTx);
 342             NodeId nodeId = nodeIid.firstKeyOf(Node.class).getNodeId();
 343             RendererNode rendNode = new RendererNodeBuilder(optRendNode.get())
 344                 .addAugmentation(VppInterfaceAugmentation.class, resolveTerminationPoints(nodeId, readIfaces.get()))
 345                 .build();
 346             rwTx.put(LogicalDatastoreType.OPERATIONAL, VppIidFactory.getRendererNodeIid(optRendNode.get()), rendNode,
 347                     true);
 348         }
 349         rTx.close();
 350         DataStoreHelper.submitToDs(rwTx);
 351     }
 352
 353     private VppInterfaceAugmentation resolveTerminationPoints(NodeId nodeId, Interfaces interfaces) {
 354         List<PhysicalInterface> phIfaces = new ArrayList<>();
 355         if (interfaces != null && interfaces.getInterface() != null) {
 356             interfaces.getInterface()
 357                 .stream()
 358                 .filter(iface -> iface.getType().equals(EthernetCsmacd.class))
 359                 .filter(iface -> iface.getAugmentation(Interface1.class) != null)
 360                 .forEach(iface -> {
 361                     PhysicalInterfaceBuilder phIface = new PhysicalInterfaceBuilder();
 362                     phIface.setInterfaceName(iface.getName());
 363                     phIface.setType(iface.getType());
 364                     phIface.setAddress(resolveIpAddress(iface.getAugmentation(Interface1.class)));
 365                     PhysicalInterfaces physicalInterfaces = hostRelatedInfoContainer
 366                                                                         .getPhysicalInterfaceState(nodeId.getValue());
 367                     if (physicalInterfaces == null) {
 368                         physicalInterfaces = new PhysicalInterfaces();
 369                         hostRelatedInfoContainer.setPhysicalInterfaceStateOfHost(nodeId.getValue(), physicalInterfaces);
 370                     }
 371
 372
 373                     if (extInterfaces.get(nodeId) != null
 374                             && extInterfaces.get(nodeId).getInterfaceName().equals(phIface.getInterfaceName())) {
 375                         phIface.setExternal(true);
 376                         extInterfaces.put(nodeId, new PhysicalInterfaceKey(iface.getName()));
 377                         physicalInterfaces
 378                                 .addPhysicalInterfaceInfo(PhysicalInterfaces.PhysicalInterfaceType.PUBLIC,
 379                                         phIface.getInterfaceName(), phIface.getAddress().get(0));
 380                         LOG.info("Interface {} is marked as public interface based on bundle configuration.",
 381                                 iface.getName());
 382                     }
 383                     if (PUBLIC_INTERFACE.equals(iface.getDescription())) {
 384                         phIface.setExternal(true);
 385                         extInterfaces.put(nodeId, new PhysicalInterfaceKey(iface.getName()));
 386                         physicalInterfaces
 387                                 .addPhysicalInterfaceInfo(PhysicalInterfaces.PhysicalInterfaceType.PUBLIC,
 388                                         phIface.getInterfaceName(), phIface.getAddress().get(0));
 389                         LOG.info("Interface {} is marked as public interface based on HC configuration.",
 390                                 iface.getName());
 391                     }
 392                     phIfaces.add(phIface.build());
 393                 });
 394         }
 395         return new VppInterfaceAugmentationBuilder().setPhysicalInterface(phIfaces).build();
 396     }
 397
 398     private List<IpAddress> resolveIpAddress(Interface1 iface) {
 399         if (iface.getIpv4() != null && iface.getIpv4().getAddress() != null) {
 400             return iface.getIpv4().getAddress().stream().map(ipv4 ->
 401                     new IpAddress(new Ipv4Address(ipv4.getIp().getValue()))).collect(Collectors.toList());
 402         } else if (iface.getIpv6() != null && iface.getIpv6().getAddress() != null) {
 403             return iface.getIpv6().getAddress().stream().map(ipv6 ->
 404                     new IpAddress(new Ipv4Address(ipv6.getIp().getValue()))).collect(Collectors.toList());
 405         }
 406         return Lists.newArrayList();
 407     }
 408
 409     public static Map<NodeId, String> resolvePublicInterfaces(ReadTransaction rTx) {
 410         Map<NodeId, String> nodes = new HashMap<>();
 411         Optional<RendererNodes> rendNodes =
 412                 DataStoreHelper.readFromDs(LogicalDatastoreType.OPERATIONAL, VppIidFactory.getRendererNodesIid(), rTx);
 413         if (!rendNodes.isPresent()) {
 414             return nodes;
 415         }
 416         rendNodes.get()
 417             .getRendererNode()
 418             .stream()
 419             .filter(rn -> rn.getAugmentation(VppInterfaceAugmentation.class) != null)
 420             .filter(rn -> rn.getAugmentation(VppInterfaceAugmentation.class).getPhysicalInterface() != null)
 421             .forEach(rn -> {
 422                 java.util.Optional<PhysicalInterface> pubInt = rn.getAugmentation(VppInterfaceAugmentation.class)
 423                     .getPhysicalInterface()
 424                     .stream()
 425                     .filter(PhysicalInterface::isExternal)
 426                     .findFirst();
 427                 if (pubInt.isPresent()) {
 428                     nodes.put(rn.getNodePath().firstKeyOf(Node.class).getNodeId(), pubInt.get().getInterfaceName());
 429                 }
 430             });
 431         return nodes;
 432     }
 433 }