elanmanager/impl/src/main/java/org/opendaylight/netvirt/elan/l2gw/ha/HwvtepHAUtil.java

   1 /*
   2  * Copyright © 2016, 2017 Ericsson India Global Services Pvt Ltd. 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 package org.opendaylight.netvirt.elan.l2gw.ha;
   9
  10 import static org.opendaylight.controller.md.sal.binding.api.WriteTransaction.CREATE_MISSING_PARENTS;
  11 import static org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType.OPERATIONAL;
  12
  13 import com.google.common.base.Optional;
  14 import com.google.common.base.Strings;
  15 import java.nio.charset.StandardCharsets;
  16 import java.util.ArrayList;
  17 import java.util.Collection;
  18 import java.util.HashMap;
  19 import java.util.HashSet;
  20 import java.util.List;
  21 import java.util.Set;
  22 import java.util.concurrent.ExecutionException;
  23 import java.util.stream.Collectors;
  24 import javax.annotation.Nullable;
  25 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  26 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  27 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  28 import org.opendaylight.genius.infra.Datastore;
  29 import org.opendaylight.genius.infra.Datastore.Configuration;
  30 import org.opendaylight.genius.infra.Datastore.Operational;
  31 import org.opendaylight.genius.infra.TypedReadWriteTransaction;
  32 import org.opendaylight.genius.infra.TypedWriteTransaction;
  33 import org.opendaylight.genius.utils.hwvtep.HwvtepNodeHACache;
  34 import org.opendaylight.netvirt.elan.l2gw.ha.commands.SwitchesCmd;
  35 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Uri;
  36 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepGlobalAugmentation;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepGlobalAugmentationBuilder;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepLogicalSwitchRef;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepNodeName;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepPhysicalLocatorRef;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.PhysicalSwitchAugmentation;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.PhysicalSwitchAugmentationBuilder;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.LogicalSwitches;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.LogicalSwitchesKey;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.Managers;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.ManagersBuilder;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.ManagersKey;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.Switches;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.managers.ManagerOtherConfigs;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.managers.ManagerOtherConfigsBuilder;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.managers.ManagerOtherConfigsKey;
  53 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  54 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
  55 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
  56 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TpId;
  57 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  58 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  59 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  60 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeBuilder;
  61 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
  62 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.node.TerminationPoint;
  63 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.node.TerminationPointKey;
  64 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  65 import org.slf4j.Logger;
  66 import org.slf4j.LoggerFactory;
  67
  68 public final class HwvtepHAUtil {
  69
  70     private static final Logger LOG = LoggerFactory.getLogger(HwvtepHAUtil.class);
  71
  72     //TODO reuse HWvtepSouthboundConstants
  73     public static final String HA_ENABLED = "ha_enabled";
  74     public static final String HWVTEP_ENTITY_TYPE = "hwvtep";
  75     public static final String TEP_PREFIX = "vxlan_over_ipv4:";
  76     public static final String HA_ID = "ha_id";
  77     public static final String HA_CHILDREN = "ha_children";
  78     public static final String PHYSICALSWITCH = "/physicalswitch/";
  79     public static final TopologyId HWVTEP_TOPOLOGY_ID = new TopologyId(new Uri("hwvtep:1"));
  80     public static final String UUID = "uuid";
  81     public static final String HWVTEP_URI_PREFIX = "hwvtep";
  82     public static final String MANAGER_KEY = "managerKey";
  83     public static final String L2GW_JOB_KEY = ":l2gw";
  84
  85     private HwvtepHAUtil() { }
  86
  87     public static HwvtepPhysicalLocatorRef buildLocatorRef(InstanceIdentifier<Node> nodeIid, String tepIp) {
  88         InstanceIdentifier<TerminationPoint> tepId = buildTpId(nodeIid, tepIp);
  89         return new HwvtepPhysicalLocatorRef(tepId);
  90     }
  91
  92     public static String getNodeIdVal(InstanceIdentifier<?> iid) {
  93         return iid.firstKeyOf(Node.class).getNodeId().getValue();
  94     }
  95
  96     public static Uuid getUUid(String key) {
  97         return new Uuid(java.util.UUID.nameUUIDFromBytes(key.getBytes(StandardCharsets.UTF_8)).toString());
  98     }
  99
 100     public static InstanceIdentifier<TerminationPoint> buildTpId(InstanceIdentifier<Node> nodeIid,String tepIp) {
 101         String tpKeyStr = TEP_PREFIX + tepIp;
 102         TerminationPointKey tpKey = new TerminationPointKey(new TpId(tpKeyStr));
 103         InstanceIdentifier<TerminationPoint> plIid = nodeIid.child(TerminationPoint.class, tpKey);
 104         return plIid;
 105     }
 106
 107     public static String getTepIpVal(HwvtepPhysicalLocatorRef locatorRef) {
 108         InstanceIdentifier<TerminationPoint> tpId = (InstanceIdentifier<TerminationPoint>) locatorRef.getValue();
 109         return tpId.firstKeyOf(TerminationPoint.class).getTpId().getValue().substring("vxlan_over_ipv4:".length());
 110     }
 111
 112     public static String getLogicalSwitchSwitchName(HwvtepLogicalSwitchRef logicalSwitchRef) {
 113         InstanceIdentifier<LogicalSwitches> id = (InstanceIdentifier<LogicalSwitches>) logicalSwitchRef.getValue();
 114         return id.firstKeyOf(LogicalSwitches.class).getHwvtepNodeName().getValue();
 115     }
 116
 117     public static String getNodeIdFromLocatorRef(HwvtepPhysicalLocatorRef locatorRef) {
 118         InstanceIdentifier<TerminationPoint> tpId = (InstanceIdentifier<TerminationPoint>) locatorRef.getValue();
 119         return tpId.firstKeyOf(Node.class).getNodeId().getValue();
 120     }
 121
 122     public static String getNodeIdFromLogicalSwitches(HwvtepLogicalSwitchRef logicalSwitchRef) {
 123         InstanceIdentifier<LogicalSwitches> id = (InstanceIdentifier<LogicalSwitches>) logicalSwitchRef.getValue();
 124         return id.firstKeyOf(Node.class).getNodeId().getValue();
 125     }
 126
 127     public static InstanceIdentifier<Node> createInstanceIdentifierFromHAId(String haUUidVal) {
 128         String nodeString = HWVTEP_URI_PREFIX + "://"
 129             + UUID + "/" + java.util.UUID.nameUUIDFromBytes(haUUidVal.getBytes(StandardCharsets.UTF_8)).toString();
 130         NodeId nodeId = new NodeId(new Uri(nodeString));
 131         NodeKey nodeKey = new NodeKey(nodeId);
 132         TopologyKey topoKey = new TopologyKey(HWVTEP_TOPOLOGY_ID);
 133         return InstanceIdentifier.builder(NetworkTopology.class)
 134                 .child(Topology.class, topoKey)
 135                 .child(Node.class, nodeKey)
 136                 .build();
 137     }
 138
 139     public static InstanceIdentifier<Node> convertToInstanceIdentifier(String nodeIdString) {
 140         NodeId nodeId = new NodeId(new Uri(nodeIdString));
 141         NodeKey nodeKey = new NodeKey(nodeId);
 142         TopologyKey topoKey = new TopologyKey(HWVTEP_TOPOLOGY_ID);
 143         return InstanceIdentifier.builder(NetworkTopology.class)
 144                 .child(Topology.class, topoKey)
 145                 .child(Node.class, nodeKey)
 146                 .build();
 147     }
 148
 149     /**
 150      * Build other config data for HA node .
 151      *
 152      * @param key The key as in HA child device other config
 153      * @param val The value as in HA child device other config
 154      * @return return other config object
 155      */
 156     public static ManagerOtherConfigsBuilder getOtherConfigBuilder(String key, String val) {
 157         ManagerOtherConfigsBuilder otherConfigsBuilder = new ManagerOtherConfigsBuilder();
 158         ManagerOtherConfigsKey otherConfigsKey = new ManagerOtherConfigsKey(key);
 159         otherConfigsBuilder.withKey(otherConfigsKey);
 160         otherConfigsBuilder.setOtherConfigKey(key);
 161         otherConfigsBuilder.setOtherConfigValue(val);
 162         return otherConfigsBuilder;
 163     }
 164
 165     public static String convertToGlobalNodeId(String psNodeId) {
 166         int idx = psNodeId.indexOf(PHYSICALSWITCH);
 167         if (idx > 0) {
 168             return psNodeId.substring(0, idx);
 169         }
 170         return psNodeId;
 171     }
 172
 173     /**
 174      * Trnaform logical switch to nodepath passed .
 175      *
 176      * @param src {@link HwvtepLogicalSwitchRef} Logical Switch Ref which needs to be transformed
 177      * @param nodePath {@link InstanceIdentifier} src needs to be transformed to this path
 178      * @return ref {@link HwvtepLogicalSwitchRef} the transforrmed result
 179      */
 180     public static HwvtepLogicalSwitchRef convertLogicalSwitchRef(HwvtepLogicalSwitchRef src,
 181                                                                  InstanceIdentifier<Node> nodePath) {
 182         InstanceIdentifier<LogicalSwitches> srcId = (InstanceIdentifier<LogicalSwitches>)src.getValue();
 183         HwvtepNodeName switchName = srcId.firstKeyOf(LogicalSwitches.class).getHwvtepNodeName();
 184         InstanceIdentifier<LogicalSwitches> iid = nodePath.augmentation(HwvtepGlobalAugmentation.class)
 185                 .child(LogicalSwitches.class, new LogicalSwitchesKey(switchName));
 186         HwvtepLogicalSwitchRef ref = new HwvtepLogicalSwitchRef(iid);
 187         return ref;
 188     }
 189
 190     /**
 191      * Trnaform locator reference to nodepath passed .
 192      *
 193      * @param src {@link HwvtepPhysicalLocatorRef} Logical Switch Ref which needs to be transformed
 194      * @param nodePath {@link InstanceIdentifier} src needs to be transformed to this path
 195      * @return physicalLocatorRef {@link HwvtepPhysicalLocatorRef} the transforrmed result
 196      */
 197     public static HwvtepPhysicalLocatorRef convertLocatorRef(HwvtepPhysicalLocatorRef src,
 198                                                              InstanceIdentifier<Node> nodePath) {
 199         InstanceIdentifier<TerminationPoint> srcTepPath = (InstanceIdentifier<TerminationPoint>)src.getValue();
 200         TpId tpId = srcTepPath.firstKeyOf(TerminationPoint.class).getTpId();
 201         InstanceIdentifier<TerminationPoint> tpPath =
 202                 nodePath.child(TerminationPoint.class, new TerminationPointKey(tpId));
 203         HwvtepPhysicalLocatorRef physicalLocatorRef = new HwvtepPhysicalLocatorRef(tpPath);
 204         return physicalLocatorRef;
 205     }
 206
 207     public static boolean isEmptyList(@Nullable List list) {
 208         return list == null || list.isEmpty();
 209     }
 210
 211     public static boolean isEmpty(Collection collection) {
 212         return collection == null || collection.isEmpty();
 213     }
 214
 215     @Nullable
 216     public static Node getOriginal(DataObjectModification<Node> mod) {
 217         Node node = null;
 218         switch (mod.getModificationType()) {
 219             case SUBTREE_MODIFIED:
 220             case DELETE:
 221                 node = mod.getDataBefore();
 222                 break;
 223             case WRITE:
 224                 if (mod.getDataBefore() !=  null) {
 225                     node = mod.getDataBefore();
 226                 }
 227                 break;
 228             default:
 229                 break;
 230         }
 231         return node;
 232     }
 233
 234     @Nullable
 235     public static Node getUpdated(DataObjectModification<Node> mod) {
 236         switch (mod.getModificationType()) {
 237             case SUBTREE_MODIFIED:
 238             case WRITE:
 239                 return mod.getDataAfter();
 240             default:
 241                 return null;
 242         }
 243     }
 244
 245     @Nullable
 246     public static Node getCreated(DataObjectModification<Node> mod) {
 247         if (mod.getModificationType() == DataObjectModification.ModificationType.WRITE
 248                 && mod.getDataBefore() == null) {
 249             return mod.getDataAfter();
 250         }
 251         return null;
 252     }
 253
 254     @Nullable
 255     public static Node getRemoved(DataObjectModification<Node> mod) {
 256         if (mod.getModificationType() == DataObjectModification.ModificationType.DELETE) {
 257             return mod.getDataBefore();
 258         }
 259         return null;
 260     }
 261
 262     @Nullable
 263     public static String getPsName(Node psNode) {
 264         String psNodeId = psNode.getNodeId().getValue();
 265         if (psNodeId.contains(PHYSICALSWITCH)) {
 266             return psNodeId.substring(psNodeId.indexOf(PHYSICALSWITCH) + PHYSICALSWITCH.length());
 267         }
 268         return null;
 269     }
 270
 271     @Nullable
 272     public static String getPsName(InstanceIdentifier<Node> psNodeIid) {
 273         String psNodeId = psNodeIid.firstKeyOf(Node.class).getNodeId().getValue();
 274         if (psNodeId.contains(PHYSICALSWITCH)) {
 275             return psNodeId.substring(psNodeId.indexOf(PHYSICALSWITCH) +  PHYSICALSWITCH.length());
 276         }
 277         return null;
 278     }
 279
 280     public static InstanceIdentifier<Node> getGlobalNodePathFromPSNode(Node psNode) {
 281         String psNodeId = psNode.getNodeId().getValue();
 282         if (psNodeId.contains(PHYSICALSWITCH)) {
 283             return convertToInstanceIdentifier(psNodeId.substring(0, psNodeId.indexOf(PHYSICALSWITCH)));
 284         }
 285         return convertToInstanceIdentifier(psNodeId);
 286     }
 287
 288     @Nullable
 289     public static InstanceIdentifier<Node> convertPsPath(Node psNode, InstanceIdentifier<Node> nodePath) {
 290         String psNodeId = psNode.getNodeId().getValue();
 291         if (psNodeId.contains(PHYSICALSWITCH)) {
 292             String psName = psNodeId.substring(psNodeId.indexOf(PHYSICALSWITCH) + PHYSICALSWITCH.length());
 293             String haPsNodeIdVal = nodePath.firstKeyOf(Node.class).getNodeId().getValue() + PHYSICALSWITCH + psName;
 294             InstanceIdentifier<Node> haPsPath = convertToInstanceIdentifier(haPsNodeIdVal);
 295             return haPsPath;
 296         } else {
 297             LOG.error("Failed to find ps path from node {}", psNode);
 298             return null;
 299         }
 300     }
 301
 302     public static NodeBuilder getNodeBuilderForPath(InstanceIdentifier<Node> haPath) {
 303         NodeBuilder nodeBuilder = new NodeBuilder();
 304         nodeBuilder.setNodeId(haPath.firstKeyOf(Node.class).getNodeId());
 305         return nodeBuilder;
 306     }
 307
 308     @Nullable
 309     public static String getHAIdFromManagerOtherConfig(Node node) {
 310         if (node.augmentation(HwvtepGlobalAugmentation.class) == null) {
 311             return null;
 312         }
 313         HwvtepGlobalAugmentation globalAugmentation = node.augmentation(HwvtepGlobalAugmentation.class);
 314         if (globalAugmentation != null) {
 315             List<Managers> managers = globalAugmentation.getManagers();
 316             if (managers != null && !managers.isEmpty() && managers.get(0).getManagerOtherConfigs() != null) {
 317                 for (ManagerOtherConfigs configs : managers.get(0).getManagerOtherConfigs()) {
 318                     if (HA_ID.equals(configs.getOtherConfigKey())) {
 319                         return configs.getOtherConfigValue();
 320                     }
 321                 }
 322             }
 323         }
 324         return null;
 325     }
 326
 327     /**
 328      * Returns ha child node path from ha node of config data tree.
 329      *
 330      * @param haGlobalConfigNodeOptional HA global node
 331      * @return ha Child ids
 332      */
 333     public static  List<NodeId> getChildNodeIdsFromManagerOtherConfig(Optional<Node> haGlobalConfigNodeOptional) {
 334         List<NodeId> childNodeIds = new ArrayList<>();
 335         if (!haGlobalConfigNodeOptional.isPresent()) {
 336             return childNodeIds;
 337         }
 338         HwvtepGlobalAugmentation augmentation =
 339                 haGlobalConfigNodeOptional.get().augmentation(HwvtepGlobalAugmentation.class);
 340         if (augmentation != null && augmentation.getManagers() != null
 341                 && augmentation.getManagers().size() > 0) {
 342             Managers managers = augmentation.getManagers().get(0);
 343             if (null == managers.getManagerOtherConfigs()) {
 344                 return childNodeIds;
 345             }
 346             for (ManagerOtherConfigs otherConfigs : managers.getManagerOtherConfigs()) {
 347                 if (HA_CHILDREN.equals(otherConfigs.getOtherConfigKey())) {
 348                     String nodeIdsVal = otherConfigs.getOtherConfigValue();
 349                     if (nodeIdsVal != null) {
 350                         String[] parts = nodeIdsVal.split(",");
 351                         for (String part : parts) {
 352                             childNodeIds.add(new NodeId(part));
 353                         }
 354                     }
 355
 356                 }
 357             }
 358         }
 359         return childNodeIds;
 360     }
 361
 362     public static HwvtepGlobalAugmentation getGlobalAugmentationOfNode(Node node) {
 363         HwvtepGlobalAugmentation result = null;
 364         if (node != null) {
 365             result = node.augmentation(HwvtepGlobalAugmentation.class);
 366         }
 367         if (result == null) {
 368             result = new HwvtepGlobalAugmentationBuilder().build();
 369         }
 370         return result;
 371     }
 372
 373     public static PhysicalSwitchAugmentation getPhysicalSwitchAugmentationOfNode(Node psNode) {
 374         PhysicalSwitchAugmentation result = null;
 375         if (psNode != null) {
 376             result = psNode.augmentation(PhysicalSwitchAugmentation.class);
 377         }
 378         if (result == null) {
 379             result = new PhysicalSwitchAugmentationBuilder().build();
 380         }
 381         return result;
 382     }
 383
 384     /**
 385      * Transform child managers (Source) to HA managers using HA node path.
 386      *
 387      * @param childNode Child Node
 388      * @param haGlobalCfg HA global config node
 389      * @return Transformed managers
 390      */
 391     public static List<Managers> buildManagersForHANode(Node childNode, Optional<Node> haGlobalCfg) {
 392
 393         Set<NodeId> nodeIds = new HashSet<>();
 394         nodeIds.add(childNode.getNodeId());
 395         List<NodeId> childNodeIds = getChildNodeIdsFromManagerOtherConfig(haGlobalCfg);
 396         nodeIds.addAll(childNodeIds);
 397
 398         ManagersBuilder builder1 = new ManagersBuilder();
 399
 400         builder1.withKey(new ManagersKey(new Uri(MANAGER_KEY)));
 401         List<ManagerOtherConfigs> otherConfigses = new ArrayList<>();
 402         String children = nodeIds.stream().map(NodeId::getValue).collect(Collectors.joining(","));
 403         otherConfigses.add(getOtherConfigBuilder(HA_CHILDREN, children).build());
 404         builder1.setManagerOtherConfigs(otherConfigses);
 405         List<Managers> managers = new ArrayList<>();
 406         managers.add(builder1.build());
 407         return managers;
 408     }
 409
 410     /**
 411      * Transform child switch (Source) to HA swicthes using HA node path.
 412      *
 413      * @param childNode  HA child node
 414      * @param haNodePath  HA node path
 415      * @param haNode Ha node object
 416      * @return Transformed switches
 417      */
 418     public static List<Switches> buildSwitchesForHANode(Node childNode,
 419                                                         InstanceIdentifier<Node> haNodePath,
 420                                                         Optional<Node> haNode) {
 421         List<Switches> psList = new ArrayList<>();
 422         boolean switchesAlreadyPresent = false;
 423         if (haNode.isPresent()) {
 424             Node node = haNode.get();
 425             HwvtepGlobalAugmentation augmentation = node.augmentation(HwvtepGlobalAugmentation.class);
 426             if (augmentation != null) {
 427                 if (augmentation.getSwitches() != null) {
 428                     if (augmentation.getSwitches().size() > 0) {
 429                         switchesAlreadyPresent = true;
 430                     }
 431                 }
 432             }
 433         }
 434         if (!switchesAlreadyPresent) {
 435             HwvtepGlobalAugmentation augmentation = childNode.augmentation(HwvtepGlobalAugmentation.class);
 436             if (augmentation != null && augmentation.getSwitches() != null) {
 437                 List<Switches> src = augmentation.getSwitches();
 438                 if (src != null && src.size() > 0) {
 439                     psList.add(new SwitchesCmd().transform(haNodePath, src.get(0)));
 440                 }
 441             }
 442         }
 443         return psList;
 444     }
 445
 446     /**
 447      * Build HA Global node from child nodes in config data tress.
 448      *
 449      * @param tx Transaction
 450      * @param childNode Child Node object
 451      * @param haNodePath Ha node path
 452      * @param haGlobalCfg HA global node object
 453      */
 454     public static void buildGlobalConfigForHANode(TypedWriteTransaction<Configuration> tx,
 455                                                   Node childNode,
 456                                                   InstanceIdentifier<Node> haNodePath,
 457                                                   Optional<Node> haGlobalCfg) {
 458
 459         NodeBuilder nodeBuilder = new NodeBuilder();
 460         HwvtepGlobalAugmentationBuilder hwvtepGlobalBuilder = new HwvtepGlobalAugmentationBuilder();
 461         hwvtepGlobalBuilder.setSwitches(buildSwitchesForHANode(childNode, haNodePath, haGlobalCfg));
 462         hwvtepGlobalBuilder.setManagers(buildManagersForHANode(childNode, haGlobalCfg));
 463
 464         nodeBuilder.setNodeId(haNodePath.firstKeyOf(Node.class).getNodeId());
 465         nodeBuilder.addAugmentation(HwvtepGlobalAugmentation.class, hwvtepGlobalBuilder.build());
 466         Node configHANode = nodeBuilder.build();
 467         tx.merge(haNodePath, configHANode, CREATE_MISSING_PARENTS);
 468     }
 469
 470     public static <D extends Datastore> void deleteNodeIfPresent(TypedReadWriteTransaction<D> tx,
 471             InstanceIdentifier<?> iid) throws ExecutionException, InterruptedException {
 472         if (tx.read(iid).get().isPresent()) {
 473             LOG.info("Deleting child node {}", getNodeIdVal(iid));
 474             tx.delete(iid);
 475         }
 476     }
 477
 478     /**
 479      * Delete PS data of HA node of Config Data tree.
 480      *
 481      * @param key Node object
 482      * @param haNode Ha Node from which to be deleted
 483      * @param tx Transaction
 484      */
 485     public static void deletePSNodesOfNode(InstanceIdentifier<Node> key, Node haNode,
 486             TypedReadWriteTransaction<Configuration> tx) throws ExecutionException, InterruptedException {
 487         //read from switches attribute and clean up them
 488         HwvtepGlobalAugmentation globalAugmentation = haNode.augmentation(HwvtepGlobalAugmentation.class);
 489         if (globalAugmentation == null) {
 490             return;
 491         }
 492         HashMap<InstanceIdentifier<Node>,Boolean> deleted = new HashMap<>();
 493         List<Switches> switches = globalAugmentation.getSwitches();
 494         if (switches != null) {
 495             for (Switches switche : switches) {
 496                 InstanceIdentifier<Node> psId = (InstanceIdentifier<Node>)switche.getSwitchRef().getValue();
 497                 deleteNodeIfPresent(tx, psId);
 498                 deleted.put(psId, Boolean.TRUE);
 499             }
 500         }
 501         //also read from managed by attribute of switches and cleanup them as a back up if the above cleanup fails
 502         Optional<Topology> topologyOptional = tx .read(key.firstIdentifierOf(Topology.class)).get();
 503         String deletedNodeId = key.firstKeyOf(Node.class).getNodeId().getValue();
 504         if (topologyOptional.isPresent()) {
 505             Topology topology = topologyOptional.get();
 506             if (topology.getNode() != null) {
 507                 for (Node psNode : topology.getNode()) {
 508                     PhysicalSwitchAugmentation ps = psNode.augmentation(PhysicalSwitchAugmentation.class);
 509                     if (ps != null) {
 510                         InstanceIdentifier<Node> iid = (InstanceIdentifier<Node>)ps.getManagedBy().getValue();
 511                         String nodeIdVal = iid.firstKeyOf(Node.class).getNodeId().getValue();
 512                         if (deletedNodeId.equals(nodeIdVal)) {
 513                             InstanceIdentifier<Node> psNodeId =
 514                                     convertToInstanceIdentifier(psNode.getNodeId().getValue());
 515                             if (deleted.containsKey(psNodeId)) {
 516                                 deleteNodeIfPresent(tx, psNodeId);
 517                             }
 518                         }
 519                     }
 520                 }
 521             }
 522         }
 523     }
 524
 525     /**
 526      * Delete switches from Node in Operational Data Tree .
 527      *
 528      * @param haPath HA node path from whih switches will be deleted
 529      * @param tx  Transaction object
 530      */
 531     public static void deleteSwitchesManagedByNode(InstanceIdentifier<Node> haPath,
 532             TypedReadWriteTransaction<Operational> tx) throws ExecutionException, InterruptedException {
 533
 534         Optional<Node> nodeOptional = tx.read(haPath).get();
 535         if (!nodeOptional.isPresent()) {
 536             return;
 537         }
 538         Node node = nodeOptional.get();
 539         HwvtepGlobalAugmentation globalAugmentation = node.augmentation(HwvtepGlobalAugmentation.class);
 540         if (globalAugmentation == null) {
 541             return;
 542         }
 543         List<Switches> switches = globalAugmentation.getSwitches();
 544         if (switches != null) {
 545             for (Switches switche : switches) {
 546                 InstanceIdentifier<Node> id = (InstanceIdentifier<Node>)switche.getSwitchRef().getValue();
 547                 deleteNodeIfPresent(tx, id);
 548             }
 549         }
 550     }
 551
 552     /**
 553      * Returns true/false if all the childrens are deleted from Operational Data store.
 554      *
 555      * @param children IID for the child node to read from OP data tree
 556      * @param tx Transaction
 557      * @return true/false boolean
 558      * @throws ReadFailedException Exception thrown if read fails
 559      */
 560     public static boolean areAllChildDeleted(Set<InstanceIdentifier<Node>> children,
 561                                              ReadWriteTransaction tx) throws ReadFailedException {
 562         for (InstanceIdentifier<Node> childId : children) {
 563             if (tx.read(OPERATIONAL, childId).checkedGet().isPresent()) {
 564                 return false;
 565             }
 566         }
 567         return true;
 568     }
 569
 570     public static void addToCacheIfHAChildNode(InstanceIdentifier<Node> childPath, Node childNode,
 571             HwvtepNodeHACache hwvtepNodeHACache) {
 572         String haId = HwvtepHAUtil.getHAIdFromManagerOtherConfig(childNode);
 573         if (!Strings.isNullOrEmpty(haId)) {
 574             InstanceIdentifier<Node> parentId = HwvtepHAUtil.createInstanceIdentifierFromHAId(haId);
 575             hwvtepNodeHACache.addChild(parentId, childPath/*child*/);
 576         }
 577     }
 578 }