bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/AdjRibOutListener.java

   1 /*
   2  * Copyright (c) 2015 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.protocol.bgp.rib.impl;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import java.util.ArrayList;
  13 import java.util.Collection;
  14 import java.util.Collections;
  15 import java.util.List;
  16 import java.util.concurrent.atomic.LongAdder;
  17 import javax.annotation.Nonnull;
  18 import javax.annotation.concurrent.NotThreadSafe;
  19 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  20 import org.opendaylight.controller.md.sal.dom.api.ClusteredDOMDataTreeChangeListener;
  21 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeService;
  22 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeIdentifier;
  23 import org.opendaylight.protocol.bgp.rib.impl.spi.Codecs;
  24 import org.opendaylight.protocol.bgp.rib.impl.spi.CodecsRegistry;
  25 import org.opendaylight.protocol.bgp.rib.impl.state.peer.PrefixesSentCounters;
  26 import org.opendaylight.protocol.bgp.rib.spi.IdentifierUtils;
  27 import org.opendaylight.protocol.bgp.rib.spi.RIBSupport;
  28 import org.opendaylight.protocol.bgp.rib.spi.RibSupportUtils;
  29 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.routes.ipv4.routes.Ipv4Route;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.UpdateBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.Attributes;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.message.NlriBuilder;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.message.WithdrawnRoutesBuilder;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerId;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.peer.AdjRibOut;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.Tables;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
  41 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  42 import org.opendaylight.yangtools.yang.common.QName;
  43 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  44 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  45 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  46 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
  47 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  48 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  49 import org.slf4j.Logger;
  50 import org.slf4j.LoggerFactory;
  51
  52 /**
  53  * Instantiated for each peer and table, listens on a particular peer's adj-rib-out,
  54  * performs transcoding to BA form (message) and sends it down the channel.
  55  */
  56 @NotThreadSafe
  57 final class AdjRibOutListener implements ClusteredDOMDataTreeChangeListener, PrefixesSentCounters {
  58
  59     private static final Logger LOG = LoggerFactory.getLogger(AdjRibOutListener.class);
  60
  61     static final QName PREFIX_QNAME = QName.create(Ipv4Route.QNAME, "prefix").intern();
  62     private final YangInstanceIdentifier.NodeIdentifier routeKeyLeaf = new YangInstanceIdentifier.NodeIdentifier(PREFIX_QNAME);
  63
  64     private final ChannelOutputLimiter session;
  65     private final Codecs codecs;
  66     private final RIBSupport support;
  67     private final boolean mpSupport;
  68     private final ListenerRegistration<AdjRibOutListener> registerDataTreeChangeListener;
  69     private final LongAdder routeCounter;
  70     private final LongAdder prefixesSentCounter = new LongAdder();
  71
  72     private AdjRibOutListener(final PeerId peerId, final TablesKey tablesKey, final YangInstanceIdentifier ribId,
  73         final CodecsRegistry registry, final RIBSupport support, final DOMDataTreeChangeService service,
  74         final ChannelOutputLimiter session, final boolean mpSupport, final LongAdder routeCounter) {
  75         this.session = requireNonNull(session);
  76         this.support = requireNonNull(support);
  77         this.codecs = registry.getCodecs(this.support);
  78         this.mpSupport = mpSupport;
  79         final YangInstanceIdentifier adjRibOutId =  ribId.node(Peer.QNAME).node(IdentifierUtils.domPeerId(peerId)).node(AdjRibOut.QNAME).node(Tables.QNAME).node(RibSupportUtils.toYangTablesKey(tablesKey));
  80         this.registerDataTreeChangeListener = service.registerDataTreeChangeListener(new DOMDataTreeIdentifier(LogicalDatastoreType.OPERATIONAL, adjRibOutId), this);
  81         this.routeCounter = routeCounter;
  82     }
  83
  84     static AdjRibOutListener create(@Nonnull final PeerId peerId, @Nonnull final TablesKey tablesKey, @Nonnull final YangInstanceIdentifier ribId,
  85         @Nonnull final CodecsRegistry registry, @Nonnull final RIBSupport support, @Nonnull final DOMDataTreeChangeService service,
  86         @Nonnull final ChannelOutputLimiter session, final boolean mpSupport, @Nonnull final LongAdder routeCounter
  87     ) {
  88         return new AdjRibOutListener(peerId, tablesKey, ribId, registry, support, service, session, mpSupport, routeCounter);
  89     }
  90
  91     @Override
  92     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
  93         LOG.debug("Data change received for AdjRibOut {}", changes);
  94         for (final DataTreeCandidate tc : changes) {
  95             LOG.trace("Change {} type {}", tc.getRootNode(), tc.getRootNode().getModificationType());
  96             for (final DataTreeCandidateNode child : tc.getRootNode().getChildNodes()) {
  97                 processSupportedFamilyRoutes(child);
  98             }
  99         }
 100         this.session.flush();
 101     }
 102
 103     private void processSupportedFamilyRoutes(final DataTreeCandidateNode child) {
 104         for (final DataTreeCandidateNode route : this.support.changedRoutes(child)) {
 105             processRouteChange(route);
 106         }
 107     }
 108
 109     private void processRouteChange(final DataTreeCandidateNode route) {
 110         final Update update;
 111         switch (route.getModificationType()) {
 112         case UNMODIFIED:
 113             LOG.debug("Skipping unmodified route {}", route.getIdentifier());
 114             return;
 115         case DELETE:
 116         case DISAPPEARED:
 117             // FIXME: we can batch deletions into a single batch
 118             update = withdraw((MapEntryNode) route.getDataBefore().get());
 119             LOG.debug("Withdrawing routes {}", update);
 120             break;
 121         case APPEARED:
 122         case SUBTREE_MODIFIED:
 123         case WRITE:
 124             update = advertise((MapEntryNode) route.getDataAfter().get());
 125             LOG.debug("Advertising routes {}", update);
 126             break;
 127         default:
 128             LOG.warn("Ignoring unhandled modification type {}", route.getModificationType());
 129             return;
 130         }
 131         this.session.write(update);
 132     }
 133
 134     private Attributes routeAttributes(final MapEntryNode route) {
 135         if (LOG.isDebugEnabled()) {
 136             LOG.debug("AdjRibOut parsing route {}", NormalizedNodes.toStringTree(route));
 137         }
 138         final ContainerNode advertisedAttrs = (ContainerNode) NormalizedNodes.findNode(route, this.support.routeAttributesIdentifier()).orNull();
 139         return this.codecs.deserializeAttributes(advertisedAttrs);
 140     }
 141
 142     private Update withdraw(final MapEntryNode route) {
 143         this.routeCounter.decrement();
 144         if (!this.mpSupport) {
 145             return buildUpdate(Collections.emptyList(), Collections.singleton(route), routeAttributes(route));
 146         }
 147         return this.support.buildUpdate(Collections.emptyList(), Collections.singleton(route), routeAttributes(route));
 148     }
 149
 150     private Update advertise(final MapEntryNode route) {
 151         this.routeCounter.increment();
 152         this.prefixesSentCounter.increment();
 153         if (!this.mpSupport) {
 154             return buildUpdate(Collections.singleton(route), Collections.emptyList(), routeAttributes(route));
 155         }
 156         return this.support.buildUpdate(Collections.singleton(route), Collections.emptyList(), routeAttributes(route));
 157     }
 158
 159     private Update buildUpdate(@Nonnull final Collection<MapEntryNode> advertised, @Nonnull final Collection<MapEntryNode> withdrawn, @Nonnull final Attributes attr) {
 160         final UpdateBuilder ub = new UpdateBuilder()
 161             .setWithdrawnRoutes(new WithdrawnRoutesBuilder().setWithdrawnRoutes(extractPrefixes(withdrawn)).build())
 162             .setNlri(new NlriBuilder().setNlri(extractPrefixes(advertised)).build());
 163         ub.setAttributes(attr);
 164         return ub.build();
 165     }
 166
 167     private List<Ipv4Prefix> extractPrefixes(final Collection<MapEntryNode> routes) {
 168         final List<Ipv4Prefix> prefs = new ArrayList<>(routes.size());
 169         for (final MapEntryNode ipv4Route : routes) {
 170             final String prefix = (String) ipv4Route.getChild(this.routeKeyLeaf).get().getValue();
 171             prefs.add(new Ipv4Prefix(prefix));
 172         }
 173         return prefs;
 174     }
 175
 176     public void close() {
 177         this.registerDataTreeChangeListener.close();
 178     }
 179
 180     boolean isMpSupported() {
 181         return this.mpSupport;
 182     }
 183
 184     @Override
 185     public long getPrefixesSentCount() {
 186         return this.prefixesSentCounter.longValue();
 187     }
 188 }