bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/LocRibWriter.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 com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.primitives.UnsignedInteger;
  13 import java.util.Arrays;
  14 import java.util.Collection;
  15 import java.util.HashMap;
  16 import java.util.Map;
  17 import java.util.Map.Entry;
  18 import javax.annotation.Nonnull;
  19 import javax.annotation.concurrent.NotThreadSafe;
  20 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  21 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  22 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeService;
  23 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeIdentifier;
  24 import org.opendaylight.controller.md.sal.dom.api.DOMDataWriteTransaction;
  25 import org.opendaylight.controller.md.sal.dom.api.DOMTransactionChain;
  26 import org.opendaylight.protocol.bgp.rib.impl.spi.RIBSupportContext;
  27 import org.opendaylight.protocol.bgp.rib.impl.spi.RIBSupportContextRegistry;
  28 import org.opendaylight.protocol.bgp.rib.spi.RIBSupport;
  29 import org.opendaylight.protocol.bgp.rib.spi.RibSupportUtils;
  30 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.AsNumber;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerId;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerRole;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.LocRib;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.peer.AdjRibOut;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.peer.EffectiveRibIn;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.Tables;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.tables.Routes;
  40 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  41 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  42 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  43 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  44 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  45 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  46 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  47 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  48 import org.slf4j.Logger;
  49 import org.slf4j.LoggerFactory;
  50
  51 @NotThreadSafe
  52 final class LocRibWriter implements AutoCloseable, DOMDataTreeChangeListener {
  53
  54     private static final Logger LOG = LoggerFactory.getLogger(LocRibWriter.class);
  55
  56     private final Map<PathArgument, AbstractRouteEntry> routeEntries = new HashMap<>();
  57     private final YangInstanceIdentifier locRibTarget;
  58     private final DOMTransactionChain chain;
  59     private final ExportPolicyPeerTracker peerPolicyTracker;
  60     private final NodeIdentifier attributesIdentifier;
  61     private final Long ourAs;
  62     private final RIBSupport ribSupport;
  63     private final NodeIdentifierWithPredicates tableKey;
  64     private final RIBSupportContextRegistry registry;
  65     private final YangInstanceIdentifier adjRibOutTarget;
  66     private final YangInstanceIdentifier ribId;
  67
  68     LocRibWriter(final RIBSupportContextRegistry registry, final DOMTransactionChain chain, final YangInstanceIdentifier target, final Long ourAs,
  69         final DOMDataTreeChangeService service, final PolicyDatabase pd, final TablesKey tablesKey) {
  70         this.chain = Preconditions.checkNotNull(chain);
  71         this.tableKey = RibSupportUtils.toYangTablesKey(tablesKey);
  72         this.locRibTarget = YangInstanceIdentifier.create(target.node(LocRib.QNAME).node(Tables.QNAME).node(this.tableKey).node(Routes.QNAME).getPathArguments());
  73         this.ourAs = Preconditions.checkNotNull(ourAs);
  74         this.registry = registry;
  75         this.ribSupport = this.registry.getRIBSupportContext(tablesKey).getRibSupport();
  76         this.attributesIdentifier = this.ribSupport.routeAttributesIdentifier();
  77         this.peerPolicyTracker = new ExportPolicyPeerTracker(service, target, pd);
  78         this.adjRibOutTarget = target.node(Peer.QNAME).node(Peer.QNAME).node(AdjRibOut.QNAME).node(Tables.QNAME).node(this.tableKey);
  79         this.ribId = target;
  80
  81         final DOMDataWriteTransaction tx = this.chain.newWriteOnlyTransaction();
  82         tx.merge(LogicalDatastoreType.OPERATIONAL, this.locRibTarget, this.ribSupport.emptyRoutes());
  83         tx.submit();
  84
  85         final YangInstanceIdentifier tableId = target.node(Peer.QNAME).node(Peer.QNAME).node(EffectiveRibIn.QNAME).node(Tables.QNAME).node(this.tableKey);
  86         service.registerDataTreeChangeListener(new DOMDataTreeIdentifier(LogicalDatastoreType.OPERATIONAL, tableId), this);
  87     }
  88
  89     public static LocRibWriter create(@Nonnull final RIBSupportContextRegistry registry, @Nonnull final TablesKey tablesKey, @Nonnull final DOMTransactionChain chain, @Nonnull final YangInstanceIdentifier target,
  90         @Nonnull final AsNumber ourAs, @Nonnull final DOMDataTreeChangeService service, @Nonnull final PolicyDatabase pd) {
  91         return new LocRibWriter(registry, chain, target, ourAs.getValue(), service, pd, tablesKey);
  92     }
  93
  94     @Override
  95     public void close() {
  96         this.peerPolicyTracker.close();
  97     }
  98
  99     private AbstractRouteEntry createEntry(final PathArgument routeId) {
 100         final AbstractRouteEntry ret = this.ribSupport.isComplexRoute() ? new ComplexRouteEntry() : new SimpleRouteEntry();
 101
 102         this.routeEntries.put(routeId, ret);
 103         LOG.trace("Created new entry for {}", routeId);
 104         return ret;
 105     }
 106
 107     @Override
 108     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
 109         final DOMDataWriteTransaction tx = this.chain.newWriteOnlyTransaction();
 110         LOG.trace("Received data change to LocRib {}", Arrays.toString(changes.toArray()));
 111         /*
 112          * We use two-stage processing here in hopes that we avoid duplicate
 113          * calculations when multiple peers have changed a particular entry.
 114          */
 115         final Map<RouteUpdateKey, AbstractRouteEntry> toUpdate = new HashMap<>();
 116         for (final DataTreeCandidate tc : changes) {
 117             final YangInstanceIdentifier path = tc.getRootPath();
 118             final NodeIdentifierWithPredicates peerKey = IdentifierUtils.peerKey(path);
 119             final PeerId peerId = IdentifierUtils.peerId(peerKey);
 120             final UnsignedInteger routerId = RouterIds.routerIdForPeerId(peerId);
 121             for (final DataTreeCandidateNode child : tc.getRootNode().getChildNodes()) {
 122                 for (final DataTreeCandidateNode route : this.ribSupport.changedRoutes(child)) {
 123                     final PathArgument routeId = route.getIdentifier();
 124                     AbstractRouteEntry entry = this.routeEntries.get(routeId);
 125
 126                     final Optional<NormalizedNode<?, ?>> maybeData = route.getDataAfter();
 127                     if (maybeData.isPresent()) {
 128                         if (entry == null) {
 129                             entry = createEntry(routeId);
 130                         }
 131
 132                         entry.addRoute(routerId, this.attributesIdentifier, maybeData.get());
 133                     } else if (entry != null && entry.removeRoute(routerId)) {
 134                         this.routeEntries.remove(routeId);
 135                         entry = null;
 136                         LOG.trace("Removed route from {}", routerId);
 137                     }
 138                     LOG.debug("Updated route {} entry {}", routeId, entry);
 139                     toUpdate.put(new RouteUpdateKey(peerId, routeId), entry);
 140                 }
 141             }
 142         }
 143
 144         // Now walk all updated entries
 145         for (final Entry<RouteUpdateKey, AbstractRouteEntry> e : toUpdate.entrySet()) {
 146             LOG.trace("Walking through {}", e);
 147             final AbstractRouteEntry entry = e.getValue();
 148             final NormalizedNode<?, ?> value;
 149
 150             if (entry != null) {
 151                 if (!entry.selectBest(this.ourAs)) {
 152                     // Best path has not changed, no need to do anything else. Proceed to next route.
 153                     LOG.trace("Continuing");
 154                     continue;
 155                 }
 156                 value = entry.createValue(e.getKey().getRouteId());
 157                 LOG.trace("Selected best value {}", value);
 158             } else {
 159                 value = null;
 160             }
 161
 162             final YangInstanceIdentifier writePath = this.ribSupport.routePath(this.locRibTarget, e.getKey().getRouteId());
 163             if (value != null) {
 164                 LOG.debug("Write route to LocRib {}", value);
 165                 tx.put(LogicalDatastoreType.OPERATIONAL, writePath, value);
 166             } else {
 167                 LOG.debug("Delete route from LocRib {}", entry);
 168                 tx.delete(LogicalDatastoreType.OPERATIONAL, writePath);
 169             }
 170
 171             /*
 172              * We need to keep track of routers and populate adj-ribs-out, too. If we do not, we need to
 173              * expose from which client a particular route was learned from in the local RIB, and have
 174              * the listener perform filtering.
 175              *
 176              * We walk the policy set in order to minimize the amount of work we do for multiple peers:
 177              * if we have two eBGP peers, for example, there is no reason why we should perform the translation
 178              * multiple times.
 179              */
 180             for (final PeerRole role : PeerRole.values()) {
 181                 final PeerExportGroup peerGroup = this.peerPolicyTracker.getPeerGroup(role);
 182                 if (peerGroup != null) {
 183                     final ContainerNode attributes = entry == null ? null : entry.attributes();
 184                     final PeerId peerId = e.getKey().getPeerId();
 185                     final ContainerNode effectiveAttributes = peerGroup.effectiveAttributes(peerId, attributes);
 186                     for (final Entry<PeerId, YangInstanceIdentifier> pid : peerGroup.getPeers()) {
 187                         // This points to adj-rib-out for a particular peer/table combination
 188                         final RIBSupportContext ribCtx = this.registry.getRIBSupportContext(this.tableKey);
 189                         // FIXME: the table should be created for a peer only once
 190                         ribCtx.clearTable(tx, pid.getValue().node(AdjRibOut.QNAME).node(Tables.QNAME).node(this.tableKey));
 191                         final YangInstanceIdentifier routeTarget = this.ribSupport.routePath(pid.getValue().node(AdjRibOut.QNAME).node(Tables.QNAME).node(this.tableKey).node(Routes.QNAME), e.getKey().getRouteId());
 192                         if (effectiveAttributes != null && value != null && !peerId.equals(pid.getKey())) {
 193                             LOG.debug("Write route to AdjRibsOut {}", value);
 194                             tx.put(LogicalDatastoreType.OPERATIONAL, routeTarget, value);
 195                             tx.put(LogicalDatastoreType.OPERATIONAL, routeTarget.node(this.attributesIdentifier), effectiveAttributes);
 196                         } else {
 197                             LOG.trace("Removing {} from transaction", routeTarget);
 198                             tx.delete(LogicalDatastoreType.OPERATIONAL, routeTarget);
 199                         }
 200                     }
 201                 }
 202             }
 203         }
 204         tx.submit();
 205     }
 206 }