renderers/vpp/src/main/java/org/opendaylight/groupbasedpolicy/renderer/vpp/iface/InterfaceManager.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.iface;
  10
  11 import javax.annotation.Nonnull;
  12 import javax.annotation.Nullable;
  13 import java.util.concurrent.ExecutionException;
  14 import java.util.concurrent.ExecutorService;
  15 import com.google.common.base.Optional;
  16 import com.google.common.base.Preconditions;
  17 import com.google.common.base.Strings;
  18 import com.google.common.eventbus.Subscribe;
  19 import com.google.common.util.concurrent.AsyncFunction;
  20 import com.google.common.util.concurrent.CheckedFuture;
  21 import com.google.common.util.concurrent.Futures;
  22 import com.google.common.util.concurrent.ListenableFuture;
  23 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  24 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  25 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  26 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  27 import org.opendaylight.groupbasedpolicy.renderer.vpp.commands.ConfigCommand;
  28 import org.opendaylight.groupbasedpolicy.renderer.vpp.commands.TapPortCommand;
  29 import org.opendaylight.groupbasedpolicy.renderer.vpp.commands.VhostUserCommand;
  30 import org.opendaylight.groupbasedpolicy.renderer.vpp.commands.VhostUserCommand.VhostUserCommandBuilder;
  31 import org.opendaylight.groupbasedpolicy.renderer.vpp.event.NodeOperEvent;
  32 import org.opendaylight.groupbasedpolicy.renderer.vpp.event.VppEndpointConfEvent;
  33 import org.opendaylight.groupbasedpolicy.renderer.vpp.util.General.Operations;
  34 import org.opendaylight.groupbasedpolicy.renderer.vpp.util.MountedDataBrokerProvider;
  35 import org.opendaylight.groupbasedpolicy.util.DataStoreHelper;
  36 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.base_endpoint.rev160427.has.absolute.location.absolute.location.LocationType;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.base_endpoint.rev160427.has.absolute.location.absolute.location.location.type.ExternalLocationCase;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.base_endpoint.rev160427.has.absolute.location.absolute.location.location.type.ExternalLocationCaseBuilder;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.renderer.policy.configuration.endpoints.AddressEndpointWithLocation;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.VppEndpoint;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.vpp.endpoint.InterfaceTypeChoice;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.vpp.endpoint._interface.type.choice.TapCase;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.vpp.endpoint._interface.type.choice.VhostUserCase;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev161214.VhostUserRole;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev161214.VppInterfaceAugmentation;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev161214.interfaces._interface.L2;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev161214.interfaces._interface.L2Builder;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev161214.l2.base.attributes.Interconnection;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev161214.l2.base.attributes.interconnection.BridgeBased;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev161214.l2.base.attributes.interconnection.BridgeBasedBuilder;
  52 import org.opendaylight.yangtools.yang.binding.DataObject;
  53 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  54 import org.slf4j.Logger;
  55 import org.slf4j.LoggerFactory;
  56
  57 public class InterfaceManager implements AutoCloseable {
  58
  59     private static final Logger LOG = LoggerFactory.getLogger(InterfaceManager.class);
  60     private final MountedDataBrokerProvider mountDataProvider;
  61     private final VppEndpointLocationProvider vppEndpointLocationProvider;
  62     private final ExecutorService netconfWorker;
  63
  64     public InterfaceManager(@Nonnull MountedDataBrokerProvider mountDataProvider, @Nonnull DataBroker dataProvider,
  65             @Nonnull ExecutorService netconfWorker) {
  66         this.mountDataProvider = Preconditions.checkNotNull(mountDataProvider);
  67         this.netconfWorker = Preconditions.checkNotNull(netconfWorker);
  68         this.vppEndpointLocationProvider = new VppEndpointLocationProvider(dataProvider);
  69     }
  70
  71     @Subscribe
  72     @SuppressWarnings("OptionalGetWithoutIsPresent")
  73     public synchronized void vppEndpointChanged(VppEndpointConfEvent event) {
  74         try {
  75             switch (event.getDtoModificationType()) {
  76                 case CREATED: {
  77                     vppEndpointCreated(event.getAfter().get()).get();
  78                 }
  79                 break;
  80                 case UPDATED:
  81                     vppEndpointUpdated(event.getBefore().get(), event.getAfter().get()).get();
  82                     break;
  83                 case DELETED:
  84                     vppEndpointDeleted(event.getBefore().get()).get();
  85                     break;
  86             }
  87         } catch (InterruptedException | ExecutionException e) {
  88             LOG.error("Failed to update Vpp Endpoint. {}", event, e);
  89         }
  90     }
  91
  92     private ListenableFuture<Void> vppEndpointCreated(VppEndpoint vppEndpoint) {
  93         InterfaceTypeChoice interfaceTypeChoice = vppEndpoint.getInterfaceTypeChoice();
  94         Optional<ConfigCommand> potentialIfaceCommand = Optional.absent();
  95         if (interfaceTypeChoice instanceof VhostUserCase) {
  96             potentialIfaceCommand = createInterfaceWithoutBdCommand(vppEndpoint, Operations.PUT);
  97         } else if (interfaceTypeChoice instanceof TapCase) {
  98             potentialIfaceCommand = createTapInterfaceWithoutBdCommand(vppEndpoint, Operations.PUT);
  99         }
 100
 101         if (!potentialIfaceCommand.isPresent()) {
 102             LOG.debug("Interface/PUT command was not created for VppEndpoint point {}", vppEndpoint);
 103             return Futures.immediateFuture(null);
 104         }
 105         ConfigCommand ifaceWithoutBdCommand = potentialIfaceCommand.get();
 106         InstanceIdentifier<?> vppNodeIid = vppEndpoint.getVppNodePath();
 107         Optional<DataBroker> potentialVppDataProvider = mountDataProvider.getDataBrokerForMountPoint(vppNodeIid);
 108         if (!potentialVppDataProvider.isPresent()) {
 109             LOG.debug("Cannot get data broker for mount point {}", vppNodeIid);
 110             return Futures.immediateFuture(null);
 111         }
 112         DataBroker vppDataBroker = potentialVppDataProvider.get();
 113         return createInterfaceOnVpp(ifaceWithoutBdCommand, vppDataBroker, vppEndpoint, vppNodeIid);
 114     }
 115
 116     private ListenableFuture<Void> createInterfaceOnVpp(ConfigCommand createIfaceWithoutBdCommand, DataBroker vppDataBroker,
 117                                                         VppEndpoint vppEndpoint, InstanceIdentifier<?> vppNodeIid) {
 118         final ReadWriteTransaction rwTx = vppDataBroker.newReadWriteTransaction();
 119         createIfaceWithoutBdCommand.execute(rwTx);
 120         return Futures.transform(rwTx.submit(), new AsyncFunction<Void, Void>() {
 121
 122             @Override
 123             public ListenableFuture<Void> apply(@Nonnull Void input) {
 124                 LOG.debug("Create interface on VPP command was successful. VPP: {} Command: {}", vppNodeIid,
 125                         createIfaceWithoutBdCommand);
 126                 return vppEndpointLocationProvider.createLocationForVppEndpoint(vppEndpoint);
 127             }
 128         }, netconfWorker);
 129     }
 130
 131     private ListenableFuture<Void> vppEndpointUpdated(@Nonnull final VppEndpoint oldVppEndpoint,
 132                                                       @Nonnull final VppEndpoint newVppEndpoint)
 133             throws ExecutionException, InterruptedException {
 134         if(!oldVppEndpoint.equals(newVppEndpoint)) {
 135             LOG.debug("Updating vpp endpoint, old EP: {} new EP: {}", oldVppEndpoint, newVppEndpoint);
 136             return Futures.transform(vppEndpointDeleted(oldVppEndpoint), new AsyncFunction<Void, Void>() {
 137                 @Override
 138                 public ListenableFuture<Void> apply(@Nonnull Void input) throws Exception {
 139                     return vppEndpointCreated(newVppEndpoint);
 140                 }
 141             });
 142         }
 143         LOG.debug("Update skipped, provided before/after vpp endpoints are equal");
 144         return Futures.immediateFuture(null);
 145     }
 146
 147     private ListenableFuture<Void> vppEndpointDeleted(@Nonnull VppEndpoint vppEndpoint) {
 148         InterfaceTypeChoice interfaceTypeChoice = vppEndpoint.getInterfaceTypeChoice();
 149         Optional<ConfigCommand> potentialIfaceCommand = Optional.absent();
 150         if (interfaceTypeChoice instanceof VhostUserCase) {
 151             potentialIfaceCommand = createInterfaceWithoutBdCommand(vppEndpoint, Operations.DELETE);
 152         } else if (interfaceTypeChoice instanceof TapCase) {
 153             potentialIfaceCommand = createTapInterfaceWithoutBdCommand(vppEndpoint, Operations.DELETE);
 154         }
 155
 156         if (!potentialIfaceCommand.isPresent()) {
 157             LOG.debug("Interface/DELETE command was not created for VppEndpoint point {}", vppEndpoint);
 158             return Futures.immediateFuture(null);
 159         }
 160         ConfigCommand ifaceWithoutBdCommand = potentialIfaceCommand.get();
 161         InstanceIdentifier<?> vppNodeIid = vppEndpoint.getVppNodePath();
 162         Optional<DataBroker> potentialVppDataProvider = mountDataProvider.getDataBrokerForMountPoint(vppNodeIid);
 163         if (!potentialVppDataProvider.isPresent()) {
 164             LOG.debug("Cannot get data broker for mount point {}", vppNodeIid);
 165             return Futures.immediateFuture(null);
 166         }
 167         DataBroker vppDataBroker = potentialVppDataProvider.get();
 168         return deleteIfaceOnVpp(ifaceWithoutBdCommand, vppDataBroker, vppEndpoint, vppNodeIid);
 169     }
 170
 171     private ListenableFuture<Void> deleteIfaceOnVpp(ConfigCommand deleteIfaceWithoutBdCommand,
 172             DataBroker vppDataBroker, VppEndpoint vppEndpoint, InstanceIdentifier<?> vppNodeIid) {
 173         ReadWriteTransaction rwTx = vppDataBroker.newReadWriteTransaction();
 174         deleteIfaceWithoutBdCommand.execute(rwTx);
 175
 176         return Futures.transform(rwTx.submit(), new AsyncFunction<Void, Void>() {
 177
 178             @Override
 179             public ListenableFuture<Void> apply(Void input) {
 180                 LOG.debug("Delete interface on VPP command was successful: VPP: {} Command: {}", vppNodeIid,
 181                         deleteIfaceWithoutBdCommand);
 182                 return vppEndpointLocationProvider.deleteLocationForVppEndpoint(vppEndpoint);
 183             }
 184         }, netconfWorker);
 185     }
 186
 187     @Subscribe
 188     public synchronized void vppNodeChanged(NodeOperEvent event) {
 189         switch (event.getDtoModificationType()) {
 190             case CREATED:
 191                 if (event.isAfterConnected()) {
 192                     // TODO read VppEndpoints or cache them during vppEndpointChanged()
 193                 }
 194                 break;
 195             case UPDATED:
 196                 if (!event.isBeforeConnected() && event.isAfterConnected()) {
 197                     // TODO reconciliation - diff between disconnected snapshot and current snapshot
 198                 }
 199                 break;
 200             case DELETED:
 201                 if (event.isBeforeConnected()) {
 202                     // TODO we could do snapshot of VppEndpoints
 203                     // which can be used for reconciliation
 204                 }
 205                 break;
 206         }
 207     }
 208
 209     private static Optional<ConfigCommand> createInterfaceWithoutBdCommand(@Nonnull VppEndpoint vppEp,
 210             @Nonnull Operations operations) {
 211         if (!hasNodeAndInterface(vppEp)) {
 212             LOG.debug("Interface command is not created for {}", vppEp);
 213             return Optional.absent();
 214         }
 215         VhostUserCommandBuilder builder = VhostUserCommand.builder();
 216         builder.setName(vppEp.getVppInterfaceName());
 217         InterfaceTypeChoice interfaceTypeChoice = vppEp.getInterfaceTypeChoice();
 218         if (interfaceTypeChoice instanceof VhostUserCase) {
 219             VhostUserCase vhostUserIface = (VhostUserCase) interfaceTypeChoice;
 220             String socket = vhostUserIface.getSocket();
 221             if (Strings.isNullOrEmpty(socket)) {
 222                 LOG.debug("Vhost user interface command is not created because socket is missing. {}", vppEp);
 223                 return Optional.absent();
 224             }
 225             builder.setSocket(socket);
 226             builder.setRole(VhostUserRole.Client);
 227         }
 228         VhostUserCommand vhostUserCommand =
 229                 builder.setOperation(operations).setDescription(vppEp.getDescription()).build();
 230         return Optional.of(vhostUserCommand);
 231     }
 232
 233     private static Optional<ConfigCommand> createTapInterfaceWithoutBdCommand(@Nonnull VppEndpoint vppEp,
 234             @Nonnull Operations operation) {
 235         if (!hasNodeAndInterface(vppEp)) {
 236             LOG.debug("Interface command is not created for {}", vppEp);
 237             return Optional.absent();
 238         }
 239         TapPortCommand.TapPortCommandBuilder builder = TapPortCommand.builder();
 240         InterfaceTypeChoice interfaceTypeChoice = vppEp.getInterfaceTypeChoice();
 241         if (interfaceTypeChoice instanceof TapCase) {
 242             TapCase tapIface = (TapCase) interfaceTypeChoice;
 243             String name = tapIface.getName();
 244             if (Strings.isNullOrEmpty(name)) {
 245                 LOG.debug("Tap interface command is not created because name is missing. {}", vppEp);
 246                 return Optional.absent();
 247             }
 248             builder.setTapName(name);
 249             builder.setPhysAddress(tapIface.getPhysicalAddress());
 250         }
 251         TapPortCommand tapPortCommand = builder
 252                 .setOperation(operation)
 253                 .setDescription(vppEp.getDescription())
 254                 .setInterfaceName(vppEp.getVppInterfaceName())
 255                 .build();
 256         return Optional.of(tapPortCommand);
 257     }
 258
 259     /**
 260      * Adds bridge domain to an interface if the interface exist.<br>
 261      * It rewrites bridge domain in case it already exist.<br>
 262      * {@link VppEndpointLocationProvider#VPP_ENDPOINT_LOCATION_PROVIDER} will update location
 263      * when the interface is created successfully.<br>
 264      * If the interface does not exist or other problems occur {@link ListenableFuture} will fail
 265      * as {@link Futures#immediateFailedFuture(Throwable)} with {@link Exception}
 266      * containing message in {@link Exception#getMessage()}
 267      *
 268      * @param bridgeDomainName bridge domain
 269      * @param addrEpWithLoc {@link AddressEndpointWithLocation} containing
 270      *        {@link ExternalLocationCase} where
 271      *        {@link ExternalLocationCase#getExternalNodeMountPoint()} MUST NOT be {@code null}
 272      *        and {@link ExternalLocationCase#getExternalNodeConnector()} MUST NOT be {@code null}
 273      * @return {@link ListenableFuture}
 274      */
 275     public synchronized @Nonnull ListenableFuture<Void> addBridgeDomainToInterface(@Nonnull String bridgeDomainName,
 276             @Nonnull AddressEndpointWithLocation addrEpWithLoc) {
 277         ExternalLocationCase epLoc = resolveAndValidateLocation(addrEpWithLoc);
 278         InstanceIdentifier<?> vppNodeIid = epLoc.getExternalNodeMountPoint();
 279         String interfacePath = epLoc.getExternalNodeConnector();
 280
 281         Optional<InstanceIdentifier<Interface>> optInterfaceIid =
 282                 VppPathMapper.interfaceToInstanceIdentifier(interfacePath);
 283         if (!optInterfaceIid.isPresent()) {
 284             return Futures.immediateFailedFuture(
 285                     new Exception("Cannot resolve interface instance-identifier for interface path" + interfacePath));
 286         }
 287         InstanceIdentifier<Interface> interfaceIid = optInterfaceIid.get();
 288
 289         Optional<DataBroker> potentialVppDataProvider = mountDataProvider.getDataBrokerForMountPoint(vppNodeIid);
 290         if (!potentialVppDataProvider.isPresent()) {
 291             return Futures.immediateFailedFuture(new Exception("Cannot get data broker for mount point " + vppNodeIid));
 292         }
 293         final DataBroker mountpoint = potentialVppDataProvider.get();
 294         final ReadWriteTransaction rwTx = mountpoint.newReadWriteTransaction();
 295         CheckedFuture<Optional<Interface>, ReadFailedException> futureIface =
 296                 rwTx.read(LogicalDatastoreType.CONFIGURATION, interfaceIid);
 297         return Futures.transform(futureIface, new AsyncFunction<Optional<Interface>, Void>() {
 298
 299             @Override
 300             public ListenableFuture<Void> apply(Optional<Interface> optIface) throws Exception {
 301                 if (!optIface.isPresent()) {
 302                     return Futures.immediateFailedFuture(new Exception("Iterface "
 303                             + interfaceIid.firstKeyOf(Interface.class) + " does not exist on node " + vppNodeIid));
 304                 }
 305
 306                 String existingBridgeDomain = resolveBridgeDomain(optIface.get());
 307                 if (bridgeDomainName.equals(existingBridgeDomain)) {
 308                     LOG.debug("Bridge domain {} already exists on interface {}", bridgeDomainName, interfacePath);
 309                     String bridgeDomainPath = VppPathMapper.bridgeDomainToRestPath(bridgeDomainName);
 310                     if (!bridgeDomainPath.equals(epLoc.getExternalNode())) {
 311                         return vppEndpointLocationProvider.replaceLocationForEndpoint(new ExternalLocationCaseBuilder()
 312                             .setExternalNode(bridgeDomainPath)
 313                             .setExternalNodeMountPoint(vppNodeIid)
 314                             .setExternalNodeConnector(interfacePath)
 315                             .build(), addrEpWithLoc.getKey());
 316                     }
 317                     return Futures.immediateFuture(null);
 318                 }
 319                 InstanceIdentifier<L2> l2Iid =
 320                         interfaceIid.builder().augmentation(VppInterfaceAugmentation.class).child(L2.class).build();
 321                 final ReadWriteTransaction rwTxRead = mountpoint.newReadWriteTransaction();
 322                 Optional<L2> optL2 = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION, l2Iid, rwTxRead);
 323                 L2Builder l2Builder = (optL2.isPresent()) ? new L2Builder(optL2.get()) : new L2Builder();
 324                 L2 l2 = l2Builder.setInterconnection(new BridgeBasedBuilder().setBridgeDomain(bridgeDomainName).build()).build();
 325                 final ReadWriteTransaction rwTxPut = prepareTransactionAndPutData(mountpoint, l2, l2Iid);
 326                 LOG.debug("Adding bridge domain {} to interface {}", bridgeDomainName, interfacePath);
 327                 return Futures.transform(rwTxPut.submit(), new AsyncFunction<Void, Void>() {
 328
 329                     @Override
 330                     public ListenableFuture<Void> apply(@Nonnull Void input) {
 331                         String bridgeDomainPath = VppPathMapper.bridgeDomainToRestPath(bridgeDomainName);
 332                         return vppEndpointLocationProvider.replaceLocationForEndpoint(new ExternalLocationCaseBuilder()
 333                                 .setExternalNode(bridgeDomainPath)
 334                                 .setExternalNodeMountPoint(vppNodeIid)
 335                                 .setExternalNodeConnector(interfacePath)
 336                                 .build(), addrEpWithLoc.getKey());
 337                     }
 338                 }, netconfWorker);
 339             }
 340         }, netconfWorker);
 341     }
 342
 343     /**
 344      * Removes bridge domain (if exist) from an interface (if exist).<br>
 345      * {@link VppEndpointLocationProvider#VPP_ENDPOINT_LOCATION_PROVIDER} will update endpoint
 346      * location.
 347      * <p>
 348      * If the interface does not exist or other problems occur {@link ListenableFuture} will fail
 349      * as {@link Futures#immediateFailedFuture(Throwable)} with {@link Exception}
 350      * containing message in {@link Exception#getMessage()}
 351      *
 352      * @param addrEpWithLoc {@link AddressEndpointWithLocation} containing
 353      *        {@link ExternalLocationCase} where
 354      *        {@link ExternalLocationCase#getExternalNodeMountPoint()} MUST NOT be {@code null}
 355      *        and {@link ExternalLocationCase#getExternalNodeConnector()} MUST NOT be {@code null}
 356      * @return {@link ListenableFuture}
 357      */
 358     public synchronized @Nonnull ListenableFuture<Void> deleteBridgeDomainFromInterface(
 359             @Nonnull AddressEndpointWithLocation addrEpWithLoc) {
 360         ExternalLocationCase epLoc = resolveAndValidateLocation(addrEpWithLoc);
 361         InstanceIdentifier<?> vppNodeIid = epLoc.getExternalNodeMountPoint();
 362         String interfacePath = epLoc.getExternalNodeConnector();
 363
 364         Optional<InstanceIdentifier<Interface>> optInterfaceIid =
 365                 VppPathMapper.interfaceToInstanceIdentifier(interfacePath);
 366         if (!optInterfaceIid.isPresent()) {
 367             return Futures.immediateFailedFuture(
 368                     new Exception("Cannot resolve interface instance-identifier for interface path" + interfacePath));
 369         }
 370         InstanceIdentifier<Interface> interfaceIid = optInterfaceIid.get();
 371
 372         Optional<DataBroker> potentialVppDataProvider = mountDataProvider.getDataBrokerForMountPoint(vppNodeIid);
 373         if (!potentialVppDataProvider.isPresent()) {
 374             return Futures.immediateFailedFuture(new Exception("Cannot get data broker for mount point " + vppNodeIid));
 375         }
 376
 377         ReadWriteTransaction rwTx = potentialVppDataProvider.get().newReadWriteTransaction();
 378         CheckedFuture<Optional<Interface>, ReadFailedException> futureIface =
 379                 rwTx.read(LogicalDatastoreType.CONFIGURATION, interfaceIid);
 380         return Futures.transform(futureIface, new AsyncFunction<Optional<Interface>, Void>() {
 381
 382             @Override
 383             public ListenableFuture<Void> apply(Optional<Interface> optIface) throws Exception {
 384                 if (!optIface.isPresent()) {
 385                     // interface does not exist so we consider job done
 386                     return Futures.immediateFuture(null);
 387                 }
 388                 String existingBridgeDomain = resolveBridgeDomain(optIface.get());
 389                 if (Strings.isNullOrEmpty(existingBridgeDomain)) {
 390                     LOG.debug("Bridge domain does not exist therefore it is considered as deleted for interface {}",
 391                             interfacePath);
 392                     // bridge domain does not exist on interface so we consider job done
 393                     return vppEndpointLocationProvider.replaceLocationForEndpoint(new ExternalLocationCaseBuilder()
 394                             .setExternalNode(null)
 395                             .setExternalNodeMountPoint(vppNodeIid)
 396                             .setExternalNodeConnector(interfacePath)
 397                             .build(), addrEpWithLoc.getKey());
 398                 }
 399                 InstanceIdentifier<L2> l2Iid =
 400                         interfaceIid.builder().augmentation(VppInterfaceAugmentation.class).child(L2.class).build();
 401                 rwTx.delete(LogicalDatastoreType.CONFIGURATION, l2Iid);
 402                 LOG.debug("Deleting bridge domain from interface {}", interfacePath);
 403                 return Futures.transform(rwTx.submit(), new AsyncFunction<Void, Void>() {
 404
 405                     @Override
 406                     public ListenableFuture<Void> apply(@Nonnull Void input) {
 407                         return vppEndpointLocationProvider.replaceLocationForEndpoint(new ExternalLocationCaseBuilder()
 408                                 .setExternalNode(null)
 409                                 .setExternalNodeMountPoint(vppNodeIid)
 410                                 .setExternalNodeConnector(interfacePath)
 411                                 .build(), addrEpWithLoc.getKey());
 412                     }
 413                 }, netconfWorker);
 414             }
 415         }, netconfWorker);
 416     }
 417
 418     private static ExternalLocationCase resolveAndValidateLocation(AddressEndpointWithLocation addrEpWithLoc) {
 419         LocationType locationType = addrEpWithLoc.getAbsoluteLocation().getLocationType();
 420         if (!(locationType instanceof ExternalLocationCase)) {
 421             throw new IllegalArgumentException("Endpoint does not have external location " + addrEpWithLoc);
 422         }
 423         ExternalLocationCase result = (ExternalLocationCase) locationType;
 424         if (result.getExternalNodeMountPoint() == null || result.getExternalNodeConnector() == null) {
 425             throw new IllegalArgumentException(
 426                     "Endpoint does not have external-node-mount-point or external-node-connector " + addrEpWithLoc);
 427         }
 428         return result;
 429     }
 430
 431     private static @Nullable String resolveBridgeDomain(@Nonnull Interface iface) {
 432         VppInterfaceAugmentation vppInterfaceAugmentation = iface.getAugmentation(VppInterfaceAugmentation.class);
 433         L2 existingL2 = vppInterfaceAugmentation.getL2();
 434         if (existingL2 != null) {
 435             Interconnection interconnection = existingL2.getInterconnection();
 436             if (interconnection instanceof BridgeBased) {
 437                 return ((BridgeBased) interconnection).getBridgeDomain();
 438             }
 439         }
 440         return null;
 441     }
 442
 443     private static boolean hasNodeAndInterface(VppEndpoint vppEp) {
 444         if (vppEp.getVppNodePath() == null) {
 445             LOG.debug("vpp-node is missing. {}", vppEp);
 446             return false;
 447         }
 448         if (Strings.isNullOrEmpty(vppEp.getVppInterfaceName())) {
 449             LOG.debug("vpp-interface-name is missing. {}", vppEp);
 450             return false;
 451         }
 452         return true;
 453     }
 454
 455     @Override
 456     public void close() throws Exception {
 457         vppEndpointLocationProvider.close();
 458     }
 459
 460     // TODO workaround for netconf, remove when fixed
 461     private synchronized <T extends DataObject> ReadWriteTransaction prepareTransactionAndPutData(final DataBroker mountpoint,
 462                                                                                                   final T data,
 463                                                                                                   InstanceIdentifier<T> iid) {
 464         final ReadWriteTransaction rwTx = mountpoint.newReadWriteTransaction();
 465         try {
 466             rwTx.put(LogicalDatastoreType.CONFIGURATION, iid, data);
 467         }
 468         catch (IllegalStateException e) {
 469             LOG.error("Assuming netconf transaction failed, restarting ...", e.getMessage());
 470             return prepareTransactionAndPutData(mountpoint, data, iid);
 471         }
 472         return rwTx;
 473     }
 474
 475 }