pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/PCEPSessionNegotiator.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.protocol.pcep.impl;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.primitives.UnsignedBytes;
  12 import io.netty.channel.Channel;
  13 import io.netty.channel.ChannelFutureListener;
  14 import io.netty.util.concurrent.Promise;
  15 import java.net.InetSocketAddress;
  16 import java.util.Comparator;
  17 import java.util.concurrent.ExecutionException;
  18 import org.opendaylight.protocol.pcep.PCEPPeerProposal;
  19 import org.opendaylight.protocol.pcep.PCEPSessionListenerFactory;
  20 import org.opendaylight.protocol.pcep.impl.PCEPPeerRegistry.SessionReference;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 public class PCEPSessionNegotiator extends AbstractSessionNegotiator {
  26
  27     private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionNegotiator.class);
  28
  29     private static final Comparator<byte[]> COMPARATOR = UnsignedBytes.lexicographicalComparator();
  30
  31     private final PCEPSessionListenerFactory factory;
  32
  33     private final AbstractPCEPSessionNegotiatorFactory negFactory;
  34     private final PCEPPeerProposal peerProposal;
  35
  36     public PCEPSessionNegotiator(final Channel channel, final Promise<PCEPSessionImpl> promise, final PCEPSessionListenerFactory factory,
  37         final AbstractPCEPSessionNegotiatorFactory negFactory, final PCEPPeerProposal peerProposal) {
  38         super(promise, channel);
  39         this.factory = factory;
  40         this.negFactory = negFactory;
  41         this.peerProposal = peerProposal;
  42     }
  43
  44     @Override
  45     protected void startNegotiation() throws ExecutionException {
  46         final Object lock = this;
  47
  48         LOG.debug("Bootstrap negotiation for channel {} started", this.channel);
  49
  50         /*
  51          * We have a chance to see if there's a client session already
  52          * registered for this client.
  53          */
  54         final byte[] clientAddress = ((InetSocketAddress) this.channel.remoteAddress()).getAddress().getAddress();
  55         final PCEPPeerRegistry sessionReg = this.negFactory.getSessionRegistry();
  56
  57         synchronized (lock) {
  58             if (sessionReg.getSessionReference(clientAddress).isPresent()) {
  59                 final byte[] serverAddress = ((InetSocketAddress) this.channel.localAddress()).getAddress().getAddress();
  60                 if (COMPARATOR.compare(serverAddress, clientAddress) > 0) {
  61                     final Optional<SessionReference> sessionRefMaybe = sessionReg.removeSessionReference(clientAddress);
  62                     try {
  63                         if (sessionRefMaybe.isPresent()) {
  64                             sessionRefMaybe.get().close();
  65                         }
  66                     } catch (final Exception e) {
  67                         LOG.error("Unexpected failure to close old session", e);
  68                     }
  69                 } else {
  70                     negotiationFailed(new IllegalStateException("A conflicting session for address "
  71                             + ((InetSocketAddress) this.channel.remoteAddress()).getAddress() + " found."));
  72                     return;
  73                 }
  74             }
  75
  76             final Short sessionId = sessionReg.nextSession(clientAddress);
  77             final AbstractPCEPSessionNegotiator n = this.negFactory.createNegotiator(this.promise, this.factory.getSessionListener(),
  78                     this.channel, sessionId, this.peerProposal);
  79
  80             sessionReg.putSessionReference(clientAddress, new SessionReference() {
  81                 @Override
  82                 public void close() throws ExecutionException {
  83                     try {
  84                         sessionReg.releaseSession(clientAddress, sessionId);
  85                     } finally {
  86                         PCEPSessionNegotiator.this.channel.close();
  87                     }
  88                 }
  89
  90                 @Override
  91                 public Short getSessionId() {
  92                     return sessionId;
  93                 }
  94             });
  95
  96             this.channel.closeFuture().addListener((ChannelFutureListener) future -> {
  97                 synchronized (lock) {
  98                     sessionReg.removeSessionReference(clientAddress);
  99                 }
 100             });
 101
 102             LOG.info("Replacing bootstrap negotiator for channel {}", this.channel);
 103             this.channel.pipeline().replace(this, "negotiator", n);
 104             n.startNegotiation();
 105         }
 106     }
 107
 108     @Override
 109     protected void handleMessage(final Message msg) {
 110         throw new IllegalStateException("Bootstrap negotiator should have been replaced");
 111     }
 112 }