hwvtepsouthbound/hwvtepsouthbound-impl/src/main/java/org/opendaylight/ovsdb/hwvtepsouthbound/HwvtepDataChangeListener.java

   1 /*
   2  * Copyright (c) 2015 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
   9 package org.opendaylight.ovsdb.hwvtepsouthbound;
  10
  11 import java.net.UnknownHostException;
  12 import java.util.Collection;
  13 import java.util.HashMap;
  14 import java.util.Map;
  15 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  16 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  17 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification.ModificationType;
  18 import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
  19 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
  20 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  21 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  22 import org.opendaylight.ovsdb.lib.OvsdbClient;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepGlobalAugmentation;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.ConnectionInfo;
  25 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  26 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  27 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  28 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  29 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  30 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 public class HwvtepDataChangeListener implements DataTreeChangeListener<Node>, AutoCloseable {
  35
  36     private ListenerRegistration<HwvtepDataChangeListener> registration;
  37     private HwvtepConnectionManager hcm;
  38     private DataBroker db;
  39     private static final Logger LOG = LoggerFactory.getLogger(HwvtepDataChangeListener.class);
  40
  41     HwvtepDataChangeListener(DataBroker db, HwvtepConnectionManager hcm) {
  42         LOG.info("Registering HwvtepDataChangeListener");
  43         this.db = db;
  44         this.hcm = hcm;
  45         registerListener(db);
  46     }
  47
  48     private void registerListener(final DataBroker db) {
  49         final DataTreeIdentifier<Node> treeId =
  50                         new DataTreeIdentifier<Node>(LogicalDatastoreType.CONFIGURATION, getWildcardPath());
  51         try {
  52             LOG.trace("Registering on path: {}", treeId);
  53             registration = db.registerDataTreeChangeListener(treeId, HwvtepDataChangeListener.this);
  54         } catch (final Exception e) {
  55             LOG.warn("HwvtepDataChangeListener registration failed");
  56             //TODO: Should we throw an exception here?
  57         }
  58     }
  59
  60     @Override
  61     public void close() throws Exception {
  62         if(registration != null) {
  63             registration.close();
  64         }
  65     }
  66
  67     @Override
  68     public void onDataTreeChanged(Collection<DataTreeModification<Node>> changes) {
  69         LOG.trace("onDataTreeChanged: {}", changes);
  70
  71         /* TODO:
  72          * Currently only handling changes to Global.
  73          * Rest will be added later.
  74          */
  75         connect(changes);
  76
  77         updateConnections(changes);
  78
  79         updateData(changes);
  80
  81         disconnect(changes);
  82         /*
  83         for (DataTreeModification<Node> change : changes) {
  84             final InstanceIdentifier<Node> key = change.getRootPath().getRootIdentifier();
  85             final DataObjectModification<Node> mod = change.getRootNode();
  86                 switch (mod.getModificationType()) {
  87                 case DELETE:
  88                     LOG.trace("Data deleted: {}", mod.getDataBefore());
  89                     //disconnect(mod);
  90                     break;
  91                 case SUBTREE_MODIFIED:
  92                     LOG.trace("Data modified: {} to {}", mod.getDataBefore(),mod.getDataAfter());
  93                     updateConnections(mod);
  94                     break;
  95                 case WRITE:
  96                     if (mod.getDataBefore() == null) {
  97                         LOG.trace("Data added: {}", mod.getDataAfter());
  98                         connect(mod.getDataAfter());
  99                     } else {
 100                         LOG.trace("Data modified: {} to {}", mod.getDataBefore(),mod.getDataAfter());
 101                         updateConnections(mod);
 102                     }
 103                     break;
 104                 default:
 105                     throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
 106                 }
 107         }
 108         */
 109     }
 110
 111     private void connect(Collection<DataTreeModification<Node>> changes) {
 112         for (DataTreeModification<Node> change : changes) {
 113             final InstanceIdentifier<Node> key = change.getRootPath().getRootIdentifier();
 114             final DataObjectModification<Node> mod = change.getRootNode();
 115             Node node = getCreated(mod);
 116             if (node != null) {
 117                 HwvtepGlobalAugmentation hwvtepGlobal = node.getAugmentation(HwvtepGlobalAugmentation.class);
 118                 ConnectionInfo connection = hwvtepGlobal.getConnectionInfo();
 119                 InstanceIdentifier<Node> iid = hcm.getInstanceIdentifier(connection);
 120                 if (iid != null) {
 121                     LOG.warn("Connection to device {} already exists. Plugin does not allow multiple connections "
 122                                     + "to same device, hence dropping the request {}", connection, hwvtepGlobal);
 123                 } else {
 124                     try {
 125                         hcm.connect(HwvtepSouthboundMapper.createInstanceIdentifier(node.getNodeId()), hwvtepGlobal);
 126                     } catch (UnknownHostException e) {
 127                         LOG.warn("Failed to connect to OVSDB node", e);
 128                     }
 129                 }
 130             }
 131         }
 132
 133     }
 134
 135     private void updateConnections(Collection<DataTreeModification<Node>> changes) {
 136         for (DataTreeModification<Node> change : changes) {
 137             final InstanceIdentifier<Node> key = change.getRootPath().getRootIdentifier();
 138             final DataObjectModification<Node> mod = change.getRootNode();
 139             Node updated = getUpdated(mod);
 140             if (updated != null) {
 141                 Node original = getOriginal(mod);
 142                 HwvtepGlobalAugmentation hgUpdated = updated.getAugmentation(HwvtepGlobalAugmentation.class);
 143                 HwvtepGlobalAugmentation hgOriginal = original.getAugmentation(HwvtepGlobalAugmentation.class);
 144                 OvsdbClient client = hcm.getClient(hgUpdated.getConnectionInfo());
 145                 if (client == null) {
 146                     try {
 147                         hcm.disconnect(hgOriginal);
 148                         hcm.connect(HwvtepSouthboundMapper.createInstanceIdentifier(original.getNodeId()), hgUpdated);
 149                     } catch (UnknownHostException e) {
 150                         LOG.warn("Failed to update connection on OVSDB Node", e);
 151                     }
 152                 }
 153             }
 154         }
 155
 156     }
 157
 158     private void updateData(Collection<DataTreeModification<Node>> changes) {
 159         /* TODO:
 160          * Get connection instances for each change
 161          * Update data for each connection
 162          * Requires Command patterns. TBD.
 163          */
 164         connectionInstancesFromChanges(changes);
 165         /*for (Entry<InstanceIdentifier<Node>, HwvtepConnectionInstance> connectionInstanceEntry :
 166             connectionInstancesFromChanges(changes).entrySet()) {
 167
 168         }*/
 169     }
 170
 171     private void disconnect(Collection<DataTreeModification<Node>> changes) {
 172         for (DataTreeModification<Node> change : changes) {
 173             final InstanceIdentifier<Node> key = change.getRootPath().getRootIdentifier();
 174             final DataObjectModification<Node> mod = change.getRootNode();
 175             Node deleted = getRemoved(mod);
 176             if (deleted != null) {
 177                 HwvtepGlobalAugmentation hgDeleted = deleted.getAugmentation(HwvtepGlobalAugmentation.class);
 178                 try {
 179                     hcm.disconnect(hgDeleted);
 180                 } catch (UnknownHostException e) {
 181                     LOG.warn("Failed to disconnect OVSDB Node", e);
 182                 }
 183             }
 184         }
 185     }
 186
 187     private Node getCreated(DataObjectModification<Node> mod) {
 188         if((mod.getModificationType() == ModificationType.WRITE)
 189                         && (mod.getDataBefore() == null)){
 190             return mod.getDataAfter();
 191         }
 192         return null;
 193     }
 194
 195     private Node getRemoved(DataObjectModification<Node> mod) {
 196         if(mod.getModificationType() == ModificationType.DELETE){
 197             return mod.getDataBefore();
 198         }
 199         return null;
 200     }
 201
 202     private Node getUpdated(DataObjectModification<Node> mod) {
 203         Node node = null;
 204         switch(mod.getModificationType()) {
 205             case SUBTREE_MODIFIED:
 206                 node = mod.getDataAfter();
 207                 break;
 208             case WRITE:
 209                 if(mod.getDataBefore() !=  null) {
 210                     node = mod.getDataAfter();
 211                 }
 212                 break;
 213             default:
 214                 break;
 215         }
 216         return node;
 217     }
 218
 219     private Node getOriginal(DataObjectModification<Node> mod) {
 220         Node node = null;
 221         switch(mod.getModificationType()) {
 222             case SUBTREE_MODIFIED:
 223                 node = mod.getDataBefore();
 224                 break;
 225             case WRITE:
 226                 if(mod.getDataBefore() !=  null) {
 227                     node = mod.getDataBefore();
 228                 }
 229                 break;
 230             case DELETE:
 231                 node = mod.getDataBefore();
 232                 break;
 233             default:
 234                 break;
 235         }
 236         return node;
 237     }
 238
 239     private InstanceIdentifier<Node> getWildcardPath() {
 240         InstanceIdentifier<Node> path = InstanceIdentifier
 241                         .create(NetworkTopology.class)
 242                         .child(Topology.class, new TopologyKey(HwvtepSouthboundConstants.HWVTEP_TOPOLOGY_ID))
 243                         .child(Node.class);
 244         return path;
 245     }
 246
 247     public Map<InstanceIdentifier<Node>, HwvtepConnectionInstance> connectionInstancesFromChanges(
 248                     Collection<DataTreeModification<Node>> changes) {
 249         Map<InstanceIdentifier<Node>, HwvtepConnectionInstance> result =
 250                         new HashMap<InstanceIdentifier<Node>, HwvtepConnectionInstance>();
 251         for (DataTreeModification<Node> change : changes) {
 252             final InstanceIdentifier<Node> key = change.getRootPath().getRootIdentifier();
 253             final DataObjectModification<Node> mod = change.getRootNode();
 254             Node created = getCreated(mod);
 255             Node updated = getUpdated(mod);
 256             Node original = getOriginal(mod);
 257             Node deleted = getRemoved(mod);
 258
 259             if((original != null) && (deleted == null)) {
 260                 result.put(key, getConnectionInstance(original));
 261             }
 262             if(created != null) {
 263                 result.put(key, getConnectionInstance(created));
 264             } else if(updated != null) {
 265                 result.put(key, getConnectionInstance(updated));
 266             }
 267         }
 268         LOG.trace("Connection Instance Map: {}", result);
 269         return result;
 270     }
 271
 272     private HwvtepConnectionInstance getConnectionInstance(Node node) {
 273         // TODO Auto-generated method stub
 274         return null;
 275     }
 276
 277
 278 }