Bug 4827: Extend ByteToMessage decoder to support peer constraints
[bgpcep.git] / bgp / rib-impl / src / main / java / org / opendaylight / protocol / bgp / rib / impl / ExportPolicyPeerTrackerImpl.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.Function;
11 import com.google.common.base.Optional;
12 import com.google.common.base.Preconditions;
13 import com.google.common.collect.ArrayListMultimap;
14 import com.google.common.collect.Collections2;
15 import com.google.common.collect.ImmutableList;
16 import com.google.common.collect.ImmutableMap;
17 import com.google.common.collect.Multimap;
18 import com.google.common.collect.Sets;
19 import java.util.AbstractMap;
20 import java.util.Collection;
21 import java.util.Collections;
22 import java.util.EnumMap;
23 import java.util.HashMap;
24 import java.util.Map;
25 import java.util.Map.Entry;
26 import java.util.Set;
27 import org.opendaylight.protocol.bgp.rib.spi.ExportPolicyPeerTracker;
28 import org.opendaylight.protocol.bgp.rib.spi.IdentifierUtils;
29 import org.opendaylight.protocol.bgp.rib.spi.PeerExportGroup;
30 import org.opendaylight.protocol.bgp.rib.spi.RibSupportUtils;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.SendReceive;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerId;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerRole;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.peer.SupportedTables;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
36 import org.opendaylight.yangtools.yang.binding.BindingMapping;
37 import org.opendaylight.yangtools.yang.common.QName;
38 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
39 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
40 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
41 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
42 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
43 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
44 import org.slf4j.Logger;
45 import org.slf4j.LoggerFactory;
46
47 final class ExportPolicyPeerTrackerImpl extends AbstractPeerRoleTracker implements ExportPolicyPeerTracker {
48     private static final Logger LOG = LoggerFactory.getLogger(ExportPolicyPeerTrackerImpl.class);
49     private static final Function<YangInstanceIdentifier, Entry<PeerId, YangInstanceIdentifier>> GENERATE_PEER_ID = new Function<YangInstanceIdentifier, Entry<PeerId, YangInstanceIdentifier>>() {
50         @Override
51         public Entry<PeerId, YangInstanceIdentifier> apply(final YangInstanceIdentifier input) {
52             final PeerId peerId = IdentifierUtils.peerId((NodeIdentifierWithPredicates) input.getLastPathArgument());
53             return new AbstractMap.SimpleImmutableEntry<>(peerId, input);
54         }
55     };
56     private static final QName SEND_RECEIVE = QName.create(SupportedTables.QNAME, "send-receive").intern();
57     private static final NodeIdentifier SEND_RECEIVE_NID = new YangInstanceIdentifier.NodeIdentifier(SEND_RECEIVE);
58     private final Map<YangInstanceIdentifier, PeerRole> peerRoles = new HashMap<>();
59     private final Set<PeerId> peerTables = Sets.newHashSet();
60     private final PolicyDatabase policyDatabase;
61     private final Map<PeerId, SendReceive> peerAddPathTables = new HashMap<>();
62     private final TablesKey localTableKey;
63     private volatile Map<PeerRole, PeerExportGroup> groups = Collections.emptyMap();
64
65     ExportPolicyPeerTrackerImpl(final PolicyDatabase policyDatabase, final TablesKey localTablesKey) {
66         this.policyDatabase = Preconditions.checkNotNull(policyDatabase);
67         this.localTableKey = localTablesKey;
68     }
69
70     private Map<PeerRole, PeerExportGroup> createGroups(final Map<YangInstanceIdentifier, PeerRole> peerPathRoles) {
71         if (peerPathRoles.isEmpty()) {
72             return Collections.emptyMap();
73         }
74
75         // Index things nicely for easy access
76         final Multimap<PeerRole, YangInstanceIdentifier> roleToIds = ArrayListMultimap.create(PeerRole.values().length, 2);
77         final Map<PeerId, PeerRole> idToRole = new HashMap<>();
78         for (final Entry<YangInstanceIdentifier, PeerRole> e : peerPathRoles.entrySet()) {
79             roleToIds.put(e.getValue(), e.getKey());
80             idToRole.put(IdentifierUtils.peerId((NodeIdentifierWithPredicates) e.getKey().getLastPathArgument()), e.getValue());
81         }
82
83         // Optimized immutable copy, reused for all PeerGroups
84         final Map<PeerId, PeerRole> allPeerRoles = ImmutableMap.copyOf(idToRole);
85
86         final Map<PeerRole, PeerExportGroup> ret = new EnumMap<>(PeerRole.class);
87         for (final Entry<PeerRole, Collection<YangInstanceIdentifier>> e : roleToIds.asMap().entrySet()) {
88             final AbstractExportPolicy policy = this.policyDatabase.exportPolicyForRole(e.getKey());
89             final Collection<Entry<PeerId, YangInstanceIdentifier>> peers = ImmutableList.copyOf(Collections2.transform(e.getValue(), GENERATE_PEER_ID));
90
91             ret.put(e.getKey(), new PeerExportGroupImpl(peers, allPeerRoles, policy));
92         }
93
94         return ret;
95     }
96
97     @Override
98     protected void peerRoleChanged(final YangInstanceIdentifier peerPath, final PeerRole role) {
99         /*
100          * This is a sledgehammer approach to the problem: modify the role map first,
101          * then construct the group map from scratch.
102          */
103         final PeerRole oldRole;
104         if (role != null) {
105             oldRole = this.peerRoles.put(peerPath, role);
106         } else {
107             oldRole = this.peerRoles.remove(peerPath);
108         }
109
110         if (role != oldRole) {
111             LOG.debug("Peer {} changed role from {} to {}", peerPath, oldRole, role);
112             this.groups = createGroups(this.peerRoles);
113         }
114     }
115
116     @Override
117     public void onTablesChanged(final PeerId peerId, final DataTreeCandidateNode tablesChange) {
118         final NodeIdentifierWithPredicates supTablesKey = RibSupportUtils.toYangKey(SupportedTables.QNAME, this.localTableKey);
119         final DataTreeCandidateNode localTableNode = tablesChange.getModifiedChild(supTablesKey);
120         if (localTableNode != null) {
121             final Optional<NormalizedNode<?, ?>> dataAfter = localTableNode.getDataAfter();
122             processSupportedSendReceiveTables(localTableNode.getModifiedChild(SEND_RECEIVE_NID), peerId);
123             if (dataAfter.isPresent()) {
124                 final boolean added = this.peerTables.add(peerId);
125                 if (added) {
126                     LOG.debug("Supported table {} added to peer {}", this.localTableKey, peerId);
127                 }
128             } else {
129                 final NodeIdentifierWithPredicates value = (NodeIdentifierWithPredicates) localTableNode.getIdentifier();
130                 this.peerTables.remove(peerId);
131                 LOG.debug("Removed tables {} from peer {}", value, peerId);
132             }
133         }
134     }
135
136     @Override
137     public PeerExportGroup getPeerGroup(final PeerRole role) {
138         return this.groups.get(Preconditions.checkNotNull(role));
139     }
140
141     @Override
142     public PeerRole getRole(final YangInstanceIdentifier peerId) {
143         return this.peerRoles.get(peerId);
144     }
145
146     private void processSupportedSendReceiveTables(final DataTreeCandidateNode sendReceiveModChild, final PeerId peerId) {
147         if (sendReceiveModChild != null) {
148             if (sendReceiveModChild.getModificationType().equals(ModificationType.DELETE)) {
149                 final Optional<NormalizedNode<?, ?>> sendReceiveNode = sendReceiveModChild.getDataBefore();
150                 if (sendReceiveNode.isPresent()) {
151                     final SendReceive sendReceiveValue = SendReceive.valueOf(BindingMapping.getClassName((String) sendReceiveNode.get().getValue()));
152                     this.peerAddPathTables.remove(peerId);
153                     LOG.debug("Supported Add BestPath table {} removed to peer {}", sendReceiveValue, peerId);
154                 }
155             } else {
156                 final Optional<NormalizedNode<?, ?>> sendReceiveNode = sendReceiveModChild.getDataAfter();
157                 if (sendReceiveNode.isPresent()) {
158                     final SendReceive sendReceiveValue = SendReceive.valueOf(BindingMapping.getClassName((String) sendReceiveNode.get().getValue()));
159                     this.peerAddPathTables.put(peerId, sendReceiveValue);
160                     LOG.debug("Supported Add BestPath table {} added to peer {}", sendReceiveValue, peerId);
161                 }
162             }
163         }
164     }
165
166     @Override
167     public boolean isTableSupported(final PeerId peerId) {
168         return this.peerTables.contains(peerId);
169     }
170
171     @Override
172     public boolean isAddPathSupportedByPeer(final PeerId peerId) {
173         final SendReceive sendReceive = this.peerAddPathTables.get(peerId);
174         return sendReceive != null && (sendReceive.equals(SendReceive.Both) || sendReceive.equals(SendReceive.Receive));
175     }
176 }