southbound/southbound-impl/src/main/java/org/opendaylight/ovsdb/southbound/OvsdbConnectionManager.java

   1 /*
   2  * Copyright (c) 2014 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 package org.opendaylight.ovsdb.southbound;
   9
  10 import static org.opendaylight.ovsdb.lib.operations.Operations.op;
  11
  12 import com.google.common.base.Optional;
  13 import com.google.common.base.Preconditions;
  14 import com.google.common.util.concurrent.CheckedFuture;
  15 import com.google.common.util.concurrent.FutureCallback;
  16 import com.google.common.util.concurrent.Futures;
  17
  18 import java.net.ConnectException;
  19 import java.net.InetAddress;
  20 import java.net.UnknownHostException;
  21 import java.util.ArrayList;
  22 import java.util.List;
  23 import java.util.Map;
  24 import java.util.concurrent.ConcurrentHashMap;
  25 import java.util.concurrent.ExecutionException;
  26 import java.util.concurrent.TimeUnit;
  27 import java.util.concurrent.TimeoutException;
  28 import javax.annotation.Nonnull;
  29 import javax.annotation.Nullable;
  30 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  31 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  32 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  33 import org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException;
  34 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  35 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidateRegistration;
  36 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipChange;
  37 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListener;
  38 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListenerRegistration;
  39 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
  40 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipState;
  41 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  42 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  43 import org.opendaylight.ovsdb.lib.OvsdbClient;
  44 import org.opendaylight.ovsdb.lib.OvsdbConnection;
  45 import org.opendaylight.ovsdb.lib.OvsdbConnectionListener;
  46 import org.opendaylight.ovsdb.lib.operations.Operation;
  47 import org.opendaylight.ovsdb.lib.operations.OperationResult;
  48 import org.opendaylight.ovsdb.lib.operations.Select;
  49 import org.opendaylight.ovsdb.lib.schema.DatabaseSchema;
  50 import org.opendaylight.ovsdb.lib.schema.GenericTableSchema;
  51 import org.opendaylight.ovsdb.lib.schema.typed.TyperUtils;
  52 import org.opendaylight.ovsdb.schema.openvswitch.OpenVSwitch;
  53 import org.opendaylight.ovsdb.southbound.reconciliation.ReconciliationManager;
  54 import org.opendaylight.ovsdb.southbound.reconciliation.ReconciliationTask;
  55 import org.opendaylight.ovsdb.southbound.reconciliation.configuration.BridgeConfigReconciliationTask;
  56 import org.opendaylight.ovsdb.southbound.reconciliation.connection.ConnectionReconciliationTask;
  57 import org.opendaylight.ovsdb.southbound.transactions.md.OvsdbNodeRemoveCommand;
  58 import org.opendaylight.ovsdb.southbound.transactions.md.TransactionCommand;
  59 import org.opendaylight.ovsdb.southbound.transactions.md.TransactionInvoker;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAttributes;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAugmentation;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbNodeAugmentation;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.ovsdb.node.attributes.ConnectionInfo;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.ovsdb.node.attributes.ManagedNodeEntry;
  65 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  66 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  67 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  68 import org.slf4j.Logger;
  69 import org.slf4j.LoggerFactory;
  70
  71 public class OvsdbConnectionManager implements OvsdbConnectionListener, AutoCloseable {
  72     private Map<ConnectionInfo, OvsdbConnectionInstance> clients =
  73             new ConcurrentHashMap<>();
  74     private static final Logger LOG = LoggerFactory.getLogger(OvsdbConnectionManager.class);
  75     private static final String ENTITY_TYPE = "ovsdb";
  76     private static final int DB_FETCH_TIMEOUT = 1000;
  77
  78     private DataBroker db;
  79     private TransactionInvoker txInvoker;
  80     private Map<ConnectionInfo,InstanceIdentifier<Node>> instanceIdentifiers =
  81             new ConcurrentHashMap<>();
  82     private Map<Entity, OvsdbConnectionInstance> entityConnectionMap =
  83             new ConcurrentHashMap<>();
  84     private EntityOwnershipService entityOwnershipService;
  85     private OvsdbDeviceEntityOwnershipListener ovsdbDeviceEntityOwnershipListener;
  86     private OvsdbConnection ovsdbConnection;
  87     private final ReconciliationManager reconciliationManager;
  88
  89     public OvsdbConnectionManager(DataBroker db,TransactionInvoker txInvoker,
  90                                   EntityOwnershipService entityOwnershipService,
  91                                   OvsdbConnection ovsdbConnection) {
  92         this.db = db;
  93         this.txInvoker = txInvoker;
  94         this.entityOwnershipService = entityOwnershipService;
  95         this.ovsdbDeviceEntityOwnershipListener = new OvsdbDeviceEntityOwnershipListener(this, entityOwnershipService);
  96         this.ovsdbConnection = ovsdbConnection;
  97         this.reconciliationManager = new ReconciliationManager(db);
  98     }
  99
 100     @Override
 101     public void connected(@Nonnull final OvsdbClient externalClient) {
 102         LOG.info("Library connected {} from {}:{} to {}:{}",
 103                 externalClient.getConnectionInfo().getType(),
 104                 externalClient.getConnectionInfo().getRemoteAddress(),
 105                 externalClient.getConnectionInfo().getRemotePort(),
 106                 externalClient.getConnectionInfo().getLocalAddress(),
 107                 externalClient.getConnectionInfo().getLocalPort());
 108         List<String> databases = new ArrayList<>();
 109         try {
 110             databases = externalClient.getDatabases().get(DB_FETCH_TIMEOUT, TimeUnit.MILLISECONDS);
 111             if (databases.contains(SouthboundConstants.OPEN_V_SWITCH)) {
 112                 OvsdbConnectionInstance client = connectedButCallBacksNotRegistered(externalClient);
 113                 // Register Cluster Ownership for ConnectionInfo
 114                 registerEntityForOwnership(client);
 115             }
 116         } catch (InterruptedException | ExecutionException | TimeoutException e) {
 117             LOG.warn("Unable to fetch Database list from device {}. Disconnecting from the device.",
 118                     externalClient.getConnectionInfo().getRemoteAddress(), e);
 119             externalClient.disconnect();
 120         }
 121
 122     }
 123
 124     public OvsdbConnectionInstance connectedButCallBacksNotRegistered(final OvsdbClient externalClient) {
 125         LOG.info("OVSDB Connection from {}:{}",externalClient.getConnectionInfo().getRemoteAddress(),
 126                 externalClient.getConnectionInfo().getRemotePort());
 127         ConnectionInfo key = SouthboundMapper.createConnectionInfo(externalClient);
 128         OvsdbConnectionInstance ovsdbConnectionInstance = getConnectionInstance(key);
 129
 130         // Check if existing ovsdbConnectionInstance for the OvsdbClient present.
 131         // In such cases, we will see if the ovsdbConnectionInstance has same externalClient.
 132         if (ovsdbConnectionInstance != null) {
 133             if (ovsdbConnectionInstance.hasOvsdbClient(externalClient)) {
 134                 LOG.warn("OVSDB Connection Instance {} already exists for client {}", key, externalClient);
 135                 return ovsdbConnectionInstance;
 136             }
 137             LOG.warn("OVSDB Connection Instance {} being replaced with client {}", key, externalClient);
 138
 139             // Unregister Cluster Ownership for ConnectionInfo
 140             // Because the ovsdbConnectionInstance is about to be completely replaced!
 141             unregisterEntityForOwnership(ovsdbConnectionInstance);
 142
 143             ovsdbConnectionInstance.disconnect();
 144
 145             removeConnectionInstance(key);
 146
 147             stopBridgeConfigReconciliationIfActive(ovsdbConnectionInstance.getInstanceIdentifier());
 148         }
 149
 150         ovsdbConnectionInstance = new OvsdbConnectionInstance(key, externalClient, txInvoker,
 151                 getInstanceIdentifier(key));
 152         ovsdbConnectionInstance.createTransactInvokers();
 153         return ovsdbConnectionInstance;
 154     }
 155
 156     @Override
 157     public void disconnected(OvsdbClient client) {
 158         LOG.info("Library disconnected {} from {}:{} to {}:{}. Cleaning up the operational data store",
 159                 client.getConnectionInfo().getType(),
 160                 client.getConnectionInfo().getRemoteAddress(),
 161                 client.getConnectionInfo().getRemotePort(),
 162                 client.getConnectionInfo().getLocalAddress(),
 163                 client.getConnectionInfo().getLocalPort());
 164         ConnectionInfo key = SouthboundMapper.createConnectionInfo(client);
 165         OvsdbConnectionInstance ovsdbConnectionInstance = getConnectionInstance(key);
 166         if (ovsdbConnectionInstance != null) {
 167             // Unregister Entity ownership as soon as possible ,so this instance should
 168             // not be used as a candidate in Entity election (given that this instance is
 169             // about to disconnect as well), if current owner get disconnected from
 170             // OVSDB device.
 171             unregisterEntityForOwnership(ovsdbConnectionInstance);
 172
 173             txInvoker.invoke(new OvsdbNodeRemoveCommand(ovsdbConnectionInstance, null, null));
 174
 175             removeConnectionInstance(key);
 176
 177             //Controller initiated connection can be terminated from switch side.
 178             //So cleanup the instance identifier cache.
 179             removeInstanceIdentifier(key);
 180             stopBridgeConfigReconciliationIfActive(ovsdbConnectionInstance.getInstanceIdentifier());
 181             retryConnection(ovsdbConnectionInstance.getInstanceIdentifier(),
 182                     ovsdbConnectionInstance.getOvsdbNodeAugmentation(),
 183                     ConnectionReconciliationTriggers.ON_DISCONNECT);
 184         } else {
 185             LOG.warn("disconnected : Connection instance not found for OVSDB Node {} ", key);
 186         }
 187         LOG.trace("OvsdbConnectionManager: exit disconnected client: {}", client);
 188     }
 189
 190     public OvsdbClient connect(InstanceIdentifier<Node> iid,
 191             OvsdbNodeAugmentation ovsdbNode) throws UnknownHostException, ConnectException {
 192         LOG.info("Connecting to {}", SouthboundUtil.connectionInfoToString(ovsdbNode.getConnectionInfo()));
 193
 194         // TODO handle case where we already have a connection
 195         // TODO use transaction chains to handle ordering issues between disconnected
 196         // TODO and connected when writing to the operational store
 197         InetAddress ip = SouthboundMapper.createInetAddress(ovsdbNode.getConnectionInfo().getRemoteIp());
 198         OvsdbClient client = ovsdbConnection.connect(ip,
 199                 ovsdbNode.getConnectionInfo().getRemotePort().getValue());
 200         // For connections from the controller to the ovs instance, the library doesn't call
 201         // this method for us
 202         if (client != null) {
 203             putInstanceIdentifier(ovsdbNode.getConnectionInfo(), iid.firstIdentifierOf(Node.class));
 204             OvsdbConnectionInstance ovsdbConnectionInstance = connectedButCallBacksNotRegistered(client);
 205             ovsdbConnectionInstance.setOvsdbNodeAugmentation(ovsdbNode);
 206
 207             // Register Cluster Ownership for ConnectionInfo
 208             registerEntityForOwnership(ovsdbConnectionInstance);
 209         } else {
 210             LOG.warn("Failed to connect to OVSDB Node {}", ovsdbNode.getConnectionInfo());
 211         }
 212         return client;
 213     }
 214
 215     public void disconnect(OvsdbNodeAugmentation ovsdbNode) throws UnknownHostException {
 216         LOG.info("Disconnecting from {}", SouthboundUtil.connectionInfoToString(ovsdbNode.getConnectionInfo()));
 217         OvsdbConnectionInstance client = getConnectionInstance(ovsdbNode.getConnectionInfo());
 218         if (client != null) {
 219             // Unregister Cluster Onwership for ConnectionInfo
 220             unregisterEntityForOwnership(client);
 221
 222             client.disconnect();
 223
 224             removeInstanceIdentifier(ovsdbNode.getConnectionInfo());
 225
 226             stopBridgeConfigReconciliationIfActive(client.getInstanceIdentifier());
 227         } else {
 228             LOG.debug("disconnect : connection instance not found for {}",ovsdbNode.getConnectionInfo());
 229         }
 230     }
 231
 232 /*    public void init(ConnectionInfo key) {
 233         OvsdbConnectionInstance client = getConnectionInstance(key);
 234
 235         // TODO (FF): make sure that this cluster instance is the 'entity owner' fo the given OvsdbConnectionInstance ?
 236
 237         if (client != null) {
 238
 239              *  Note: registerCallbacks() is idemPotent... so if you call it repeatedly all is safe,
 240              *  it only registersCallbacks on the *first* call.
 241
 242             client.registerCallbacks();
 243         }
 244     }
 245 */
 246     @Override
 247     public void close() {
 248         if (ovsdbDeviceEntityOwnershipListener != null) {
 249             ovsdbDeviceEntityOwnershipListener.close();
 250         }
 251
 252         for (OvsdbConnectionInstance client: clients.values()) {
 253             client.disconnect();
 254         }
 255     }
 256
 257     private void putConnectionInstance(ConnectionInfo key,OvsdbConnectionInstance instance) {
 258         ConnectionInfo connectionInfo = SouthboundMapper.suppressLocalIpPort(key);
 259         clients.put(connectionInfo, instance);
 260     }
 261
 262     private void removeConnectionInstance(ConnectionInfo key) {
 263         ConnectionInfo connectionInfo = SouthboundMapper.suppressLocalIpPort(key);
 264         clients.remove(connectionInfo);
 265     }
 266
 267     private void putInstanceIdentifier(ConnectionInfo key,InstanceIdentifier<Node> iid) {
 268         ConnectionInfo connectionInfo = SouthboundMapper.suppressLocalIpPort(key);
 269         instanceIdentifiers.put(connectionInfo, iid);
 270     }
 271
 272     private void removeInstanceIdentifier(ConnectionInfo key) {
 273         ConnectionInfo connectionInfo = SouthboundMapper.suppressLocalIpPort(key);
 274         instanceIdentifiers.remove(connectionInfo);
 275     }
 276
 277     public InstanceIdentifier<Node> getInstanceIdentifier(ConnectionInfo key) {
 278         ConnectionInfo connectionInfo = SouthboundMapper.suppressLocalIpPort(key);
 279         return instanceIdentifiers.get(connectionInfo);
 280     }
 281
 282     public OvsdbConnectionInstance getConnectionInstance(ConnectionInfo key) {
 283         ConnectionInfo connectionInfo = SouthboundMapper.suppressLocalIpPort(key);
 284         return clients.get(connectionInfo);
 285     }
 286
 287     public OvsdbConnectionInstance getConnectionInstance(OvsdbBridgeAttributes mn) {
 288         Optional<OvsdbNodeAugmentation> optional = SouthboundUtil.getManagingNode(db, mn);
 289         if (optional.isPresent()) {
 290             return getConnectionInstance(optional.get().getConnectionInfo());
 291         } else {
 292             return null;
 293         }
 294     }
 295
 296     public OvsdbConnectionInstance getConnectionInstance(Node node) {
 297         Preconditions.checkNotNull(node);
 298         OvsdbNodeAugmentation ovsdbNode = node.getAugmentation(OvsdbNodeAugmentation.class);
 299         OvsdbBridgeAugmentation ovsdbManagedNode = node.getAugmentation(OvsdbBridgeAugmentation.class);
 300         if (ovsdbNode != null) {
 301             return getConnectionInstance(ovsdbNode.getConnectionInfo());
 302         } else if (ovsdbManagedNode != null) {
 303             return getConnectionInstance(ovsdbManagedNode);
 304         } else {
 305             LOG.warn("This is not a node that gives any hint how to find its OVSDB Manager: {}",node);
 306             return null;
 307         }
 308     }
 309
 310     public OvsdbConnectionInstance getConnectionInstance(InstanceIdentifier<Node> nodePath) {
 311         try {
 312             ReadOnlyTransaction transaction = db.newReadOnlyTransaction();
 313             CheckedFuture<Optional<Node>, ReadFailedException> nodeFuture = transaction.read(
 314                     LogicalDatastoreType.OPERATIONAL, nodePath);
 315             transaction.close();
 316             Optional<Node> optional = nodeFuture.get();
 317             if (optional != null && optional.isPresent() && optional.get() != null) {
 318                 return this.getConnectionInstance(optional.get());
 319             } else {
 320                 LOG.warn("Found non-topological node {} on path {}",optional);
 321                 return null;
 322             }
 323         } catch (InterruptedException | ExecutionException e) {
 324             LOG.warn("Failed to get Ovsdb Node {}",nodePath, e);
 325             return null;
 326         }
 327     }
 328
 329     public OvsdbClient getClient(ConnectionInfo connectionInfo) {
 330         return getConnectionInstance(connectionInfo).getOvsdbClient();
 331     }
 332
 333     public OvsdbClient getClient(OvsdbBridgeAttributes mn) {
 334         return getConnectionInstance(mn).getOvsdbClient();
 335     }
 336
 337     public OvsdbClient getClient(Node node) {
 338         return getConnectionInstance(node).getOvsdbClient();
 339     }
 340
 341     public Boolean getHasDeviceOwnership(ConnectionInfo connectionInfo) {
 342         OvsdbConnectionInstance ovsdbConnectionInstance = getConnectionInstance(connectionInfo);
 343         if (ovsdbConnectionInstance == null) {
 344             return Boolean.FALSE;
 345         }
 346         return ovsdbConnectionInstance.getHasDeviceOwnership();
 347     }
 348
 349     public void reconcileConnection(InstanceIdentifier<Node> iid, OvsdbNodeAugmentation ovsdbNode) {
 350         this.retryConnection(iid, ovsdbNode,
 351                 ConnectionReconciliationTriggers.ON_CONTROLLER_INITIATED_CONNECTION_FAILURE);
 352
 353     }
 354
 355     public void stopConnectionReconciliationIfActive(InstanceIdentifier<?> iid, OvsdbNodeAugmentation ovsdbNode) {
 356         final ReconciliationTask task = new ConnectionReconciliationTask(
 357                 reconciliationManager,
 358                 this,
 359                 iid,
 360                 ovsdbNode);
 361         reconciliationManager.dequeue(task);
 362     }
 363
 364     public void stopBridgeConfigReconciliationIfActive(InstanceIdentifier<?> iid) {
 365         final ReconciliationTask task = new BridgeConfigReconciliationTask(
 366                 reconciliationManager,
 367                 this,
 368                 iid,
 369                 null);
 370         reconciliationManager.dequeue(task);
 371     }
 372
 373     private void handleOwnershipChanged(EntityOwnershipChange ownershipChange) {
 374         OvsdbConnectionInstance ovsdbConnectionInstance = getConnectionInstanceFromEntity(ownershipChange.getEntity());
 375         LOG.debug("handleOwnershipChanged: {} event received for device {}",
 376                 ownershipChange, ovsdbConnectionInstance != null ? ovsdbConnectionInstance.getConnectionInfo()
 377                         : "that's currently NOT registered by *this* southbound plugin instance");
 378
 379         if (ovsdbConnectionInstance == null) {
 380             if (ownershipChange.isOwner()) {
 381                 LOG.warn("handleOwnershipChanged: *this* instance is elected as an owner of the device {} but it "
 382                         + "is NOT registered for ownership", ownershipChange.getEntity());
 383             } else {
 384                 // EntityOwnershipService sends notification to all the nodes, irrespective of whether
 385                 // that instance registered for the device ownership or not. It is to make sure that
 386                 // If all the controller instance that was connected to the device are down, so the
 387                 // running instance can clear up the operational data store even though it was not
 388                 // connected to the device.
 389                 LOG.debug("handleOwnershipChanged: No connection instance found for {}", ownershipChange.getEntity());
 390             }
 391
 392             // If entity has no owner, clean up the operational data store (it's possible because owner controller
 393             // might went down abruptly and didn't get a chance to clean up the operational data store.
 394             if (!ownershipChange.hasOwner()) {
 395                 LOG.info("{} has no owner, cleaning up the operational data store", ownershipChange.getEntity());
 396                 cleanEntityOperationalData(ownershipChange.getEntity());
 397             }
 398             return;
 399         }
 400         //Connection detail need to be cached, irrespective of ownership result.
 401         putConnectionInstance(ovsdbConnectionInstance.getMDConnectionInfo(),ovsdbConnectionInstance);
 402
 403         if (ownershipChange.isOwner() == ovsdbConnectionInstance.getHasDeviceOwnership()) {
 404             LOG.info("handleOwnershipChanged: no change in ownership for {}. Ownership status is : {}",
 405                     ovsdbConnectionInstance.getConnectionInfo(), ovsdbConnectionInstance.getHasDeviceOwnership()
 406                             ? SouthboundConstants.OwnershipStates.OWNER.getState()
 407                             : SouthboundConstants.OwnershipStates.NONOWNER.getState());
 408             return;
 409         }
 410
 411         ovsdbConnectionInstance.setHasDeviceOwnership(ownershipChange.isOwner());
 412         // You were not an owner, but now you are
 413         if (ownershipChange.isOwner()) {
 414             LOG.info("handleOwnershipChanged: *this* southbound plugin instance is an OWNER of the device {}",
 415                     ovsdbConnectionInstance.getConnectionInfo());
 416
 417             //*this* instance of southbound plugin is owner of the device,
 418             //so register for monitor callbacks
 419             ovsdbConnectionInstance.registerCallbacks();
 420
 421             reconcileBridgeConfigurations(ovsdbConnectionInstance);
 422         } else {
 423             //You were owner of the device, but now you are not. With the current ownership
 424             //grant mechanism, this scenario should not occur. Because this scenario will occur
 425             //when this controller went down or switch flap the connection, but in both the case
 426             //it will go through the re-registration process. We need to implement this condition
 427             //when clustering service implement a ownership grant strategy which can revoke the
 428             //device ownership for load balancing the devices across the instances.
 429             //Once this condition occur, we should unregister the callback.
 430             LOG.error("handleOwnershipChanged: *this* southbound plugin instance is no longer the owner of device {}."
 431                     + "This should NOT happen.",
 432                     ovsdbConnectionInstance.getNodeId().getValue());
 433         }
 434     }
 435
 436     private void cleanEntityOperationalData(Entity entity) {
 437
 438         //Do explicit cleanup rather than using OvsdbNodeRemoveCommand, because there
 439         // are chances that other controller instance went down abruptly and it does
 440         // not clear manager entry, which OvsdbNodeRemoveCommand look for before cleanup.
 441
 442         @SuppressWarnings("unchecked") final InstanceIdentifier<Node> nodeIid =
 443                 (InstanceIdentifier<Node>) SouthboundUtil
 444                         .getInstanceIdentifierCodec().bindingDeserializer(entity.getId());
 445
 446         txInvoker.invoke(new TransactionCommand() {
 447             @Override
 448             public void execute(ReadWriteTransaction transaction) {
 449                 Optional<Node> ovsdbNodeOpt = SouthboundUtil.readNode(transaction, nodeIid);
 450                 if (ovsdbNodeOpt.isPresent()) {
 451                     Node ovsdbNode = ovsdbNodeOpt.get();
 452                     OvsdbNodeAugmentation nodeAugmentation = ovsdbNode.getAugmentation(OvsdbNodeAugmentation.class);
 453                     if (nodeAugmentation != null) {
 454                         if (nodeAugmentation.getManagedNodeEntry() != null) {
 455                             for (ManagedNodeEntry managedNode : nodeAugmentation.getManagedNodeEntry()) {
 456                                 transaction.delete(
 457                                         LogicalDatastoreType.OPERATIONAL, managedNode.getBridgeRef().getValue());
 458                             }
 459                         } else {
 460                             LOG.debug("{} had no managed nodes", ovsdbNode.getNodeId().getValue());
 461                         }
 462                     }
 463                     transaction.delete(LogicalDatastoreType.OPERATIONAL, nodeIid);
 464                 }
 465             }
 466         });
 467
 468     }
 469
 470     private OpenVSwitch getOpenVswitchTableEntry(OvsdbConnectionInstance connectionInstance) {
 471         DatabaseSchema dbSchema = null;
 472         OpenVSwitch openVSwitchRow = null;
 473         try {
 474             dbSchema = connectionInstance.getSchema(OvsdbSchemaContants.DATABASE_NAME).get();
 475         } catch (InterruptedException | ExecutionException e) {
 476             LOG.warn("Not able to fetch schema for database {} from device {}",
 477                     OvsdbSchemaContants.DATABASE_NAME,connectionInstance.getConnectionInfo(),e);
 478         }
 479         if (dbSchema != null) {
 480             GenericTableSchema openVSwitchSchema = TyperUtils.getTableSchema(dbSchema, OpenVSwitch.class);
 481
 482             List<String> openVSwitchTableColumn = new ArrayList<>();
 483             openVSwitchTableColumn.addAll(openVSwitchSchema.getColumns());
 484             Select<GenericTableSchema> selectOperation = op.select(openVSwitchSchema);
 485             selectOperation.setColumns(openVSwitchTableColumn);
 486
 487             List<Operation> operations = new ArrayList<>();
 488             operations.add(selectOperation);
 489             operations.add(op.comment("Fetching Open_VSwitch table rows"));
 490             try {
 491                 List<OperationResult> results = connectionInstance.transact(dbSchema, operations).get();
 492                 if (results != null ) {
 493                     OperationResult selectResult = results.get(0);
 494                     openVSwitchRow = TyperUtils.getTypedRowWrapper(
 495                             dbSchema,OpenVSwitch.class,selectResult.getRows().get(0));
 496
 497                 }
 498             } catch (InterruptedException | ExecutionException e) {
 499                 LOG.warn("Not able to fetch OpenVswitch table row from device {}",
 500                         connectionInstance.getConnectionInfo(),e);
 501             }
 502         }
 503         return openVSwitchRow;
 504     }
 505
 506     private Entity getEntityFromConnectionInstance(@Nonnull OvsdbConnectionInstance ovsdbConnectionInstance) {
 507         InstanceIdentifier<Node> iid = ovsdbConnectionInstance.getInstanceIdentifier();
 508         if ( iid == null ) {
 509             /* Switch initiated connection won't have iid, till it gets OpenVSwitch
 510              * table update but update callback is always registered after ownership
 511              * is granted. So we are explicitly fetch the row here to get the iid.
 512              */
 513             OpenVSwitch openvswitchRow = getOpenVswitchTableEntry(ovsdbConnectionInstance);
 514             iid = SouthboundMapper.getInstanceIdentifier(openvswitchRow);
 515             LOG.info("InstanceIdentifier {} generated for device "
 516                     + "connection {}",iid,ovsdbConnectionInstance.getConnectionInfo());
 517             ovsdbConnectionInstance.setInstanceIdentifier(iid);
 518         }
 519         YangInstanceIdentifier entityId = SouthboundUtil.getInstanceIdentifierCodec().getYangInstanceIdentifier(iid);
 520         Entity deviceEntity = new Entity(ENTITY_TYPE, entityId);
 521         LOG.debug("Entity {} created for device connection {}",
 522                 deviceEntity, ovsdbConnectionInstance.getConnectionInfo());
 523         return deviceEntity;
 524     }
 525
 526     private OvsdbConnectionInstance getConnectionInstanceFromEntity(Entity entity) {
 527         return entityConnectionMap.get(entity);
 528     }
 529
 530     private void registerEntityForOwnership(OvsdbConnectionInstance ovsdbConnectionInstance) {
 531
 532         Entity candidateEntity = getEntityFromConnectionInstance(ovsdbConnectionInstance);
 533         entityConnectionMap.put(candidateEntity, ovsdbConnectionInstance);
 534         ovsdbConnectionInstance.setConnectedEntity(candidateEntity);
 535         try {
 536             EntityOwnershipCandidateRegistration registration =
 537                     entityOwnershipService.registerCandidate(candidateEntity);
 538             ovsdbConnectionInstance.setDeviceOwnershipCandidateRegistration(registration);
 539             LOG.info("OVSDB entity {} is registered for ownership.", candidateEntity);
 540
 541             //If entity already has owner, it won't get notification from EntityOwnershipService
 542             //so cache the connection instances.
 543             Optional<EntityOwnershipState> ownershipStateOpt =
 544                     entityOwnershipService.getOwnershipState(candidateEntity);
 545             if (ownershipStateOpt.isPresent()) {
 546                 EntityOwnershipState ownershipState = ownershipStateOpt.get();
 547                 if (ownershipState.hasOwner() && !ownershipState.isOwner()) {
 548                     LOG.info("OVSDB entity {} is already owned by other southbound plugin "
 549                                     + "instance, so *this* instance is NOT an OWNER of the device",
 550                             ovsdbConnectionInstance.getConnectionInfo());
 551                     putConnectionInstance(ovsdbConnectionInstance.getMDConnectionInfo(),ovsdbConnectionInstance);
 552                 }
 553             }
 554         } catch (CandidateAlreadyRegisteredException e) {
 555             LOG.warn("OVSDB entity {} was already registered for ownership", candidateEntity, e);
 556         }
 557
 558     }
 559
 560     private void unregisterEntityForOwnership(OvsdbConnectionInstance ovsdbConnectionInstance) {
 561         ovsdbConnectionInstance.closeDeviceOwnershipCandidateRegistration();
 562         entityConnectionMap.remove(ovsdbConnectionInstance.getConnectedEntity());
 563     }
 564
 565     private void retryConnection(final InstanceIdentifier<Node> iid, final OvsdbNodeAugmentation ovsdbNode,
 566                                  ConnectionReconciliationTriggers trigger) {
 567         final ReconciliationTask task = new ConnectionReconciliationTask(
 568                 reconciliationManager,
 569                 this,
 570                 iid,
 571                 ovsdbNode);
 572
 573         if (reconciliationManager.isEnqueued(task)) {
 574             return;
 575         }
 576         switch (trigger) {
 577             case ON_CONTROLLER_INITIATED_CONNECTION_FAILURE:
 578                 reconciliationManager.enqueueForRetry(task);
 579                 break;
 580             case ON_DISCONNECT:
 581             {
 582                 ReadOnlyTransaction tx = db.newReadOnlyTransaction();
 583                 CheckedFuture<Optional<Node>, ReadFailedException> readNodeFuture =
 584                         tx.read(LogicalDatastoreType.CONFIGURATION, iid);
 585
 586                 final OvsdbConnectionManager connectionManager = this;
 587                 Futures.addCallback(readNodeFuture, new FutureCallback<Optional<Node>>() {
 588                     @Override
 589                     public void onSuccess(@Nullable Optional<Node> node) {
 590                         if (node.isPresent()) {
 591                             LOG.info("Disconnected/Failed connection {} was controller initiated, attempting "
 592                                     + "reconnection", ovsdbNode.getConnectionInfo());
 593                             reconciliationManager.enqueue(task);
 594
 595                         } else {
 596                             LOG.debug("Connection {} was switch initiated, no reconciliation is required",
 597                                     iid.firstKeyOf(Node.class).getNodeId());
 598                         }
 599                     }
 600
 601                     @Override
 602                     public void onFailure(Throwable throwable) {
 603                         LOG.warn("Read Config/DS for Node failed! {}", iid, throwable);
 604                     }
 605                 });
 606                 break;
 607             }
 608             default:
 609                 break;
 610         }
 611     }
 612
 613     private void reconcileBridgeConfigurations(final OvsdbConnectionInstance client) {
 614         final InstanceIdentifier<Node> nodeIid = client.getInstanceIdentifier();
 615         final ReconciliationTask task = new BridgeConfigReconciliationTask(
 616                 reconciliationManager, OvsdbConnectionManager.this, nodeIid, client);
 617
 618         reconciliationManager.enqueue(task);
 619     }
 620
 621     private class OvsdbDeviceEntityOwnershipListener implements EntityOwnershipListener {
 622         private OvsdbConnectionManager cm;
 623         private EntityOwnershipListenerRegistration listenerRegistration;
 624
 625         OvsdbDeviceEntityOwnershipListener(OvsdbConnectionManager cm, EntityOwnershipService entityOwnershipService) {
 626             this.cm = cm;
 627             listenerRegistration = entityOwnershipService.registerListener(ENTITY_TYPE, this);
 628         }
 629
 630         public void close() {
 631             listenerRegistration.close();
 632         }
 633
 634         @Override
 635         public void ownershipChanged(EntityOwnershipChange ownershipChange) {
 636             cm.handleOwnershipChanged(ownershipChange);
 637         }
 638     }
 639
 640     private enum ConnectionReconciliationTriggers {
 641         /*
 642         Reconciliation trigger for scenario where controller's attempt
 643         to connect to switch fails on config data store notification
 644         */
 645         ON_CONTROLLER_INITIATED_CONNECTION_FAILURE,
 646
 647         /*
 648         Reconciliation trigger for the scenario where controller
 649         initiated connection disconnects.
 650         */
 651         ON_DISCONNECT
 652     }
 653 }