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,
  37             final PCEPSessionListenerFactory factory,
  38         final AbstractPCEPSessionNegotiatorFactory negFactory, final PCEPPeerProposal peerProposal) {
  39         super(promise, channel);
  40         this.factory = factory;
  41         this.negFactory = negFactory;
  42         this.peerProposal = peerProposal;
  43     }
  44
  45     @Override
  46     protected void startNegotiation() throws ExecutionException {
  47         final Object lock = this;
  48
  49         LOG.debug("Bootstrap negotiation for channel {} started", this.channel);
  50
  51         /*
  52          * We have a chance to see if there's a client session already
  53          * registered for this client.
  54          */
  55         final byte[] clientAddress = ((InetSocketAddress) this.channel.remoteAddress()).getAddress().getAddress();
  56         final PCEPPeerRegistry sessionReg = this.negFactory.getSessionRegistry();
  57
  58         synchronized (lock) {
  59             if (sessionReg.getSessionReference(clientAddress).isPresent()) {
  60                 final byte[] serverAddress = ((InetSocketAddress) this.channel.localAddress()).getAddress().getAddress();
  61                 if (COMPARATOR.compare(serverAddress, clientAddress) > 0) {
  62                     final Optional<SessionReference> sessionRefMaybe = sessionReg.removeSessionReference(clientAddress);
  63                     try {
  64                         if (sessionRefMaybe.isPresent()) {
  65                             sessionRefMaybe.get().close();
  66                         }
  67                     } catch (final Exception e) {
  68                         LOG.error("Unexpected failure to close old session", e);
  69                     }
  70                 } else {
  71                     negotiationFailed(new IllegalStateException("A conflicting session for address "
  72                             + ((InetSocketAddress) this.channel.remoteAddress()).getAddress() + " found."));
  73                     return;
  74                 }
  75             }
  76
  77             final Short sessionId = sessionReg.nextSession(clientAddress);
  78             final AbstractPCEPSessionNegotiator n = this.negFactory
  79                     .createNegotiator(this.promise, this.factory.getSessionListener(),
  80                     this.channel, sessionId, this.peerProposal);
  81
  82             sessionReg.putSessionReference(clientAddress, new SessionReference() {
  83                 @Override
  84                 public void close() throws ExecutionException {
  85                     try {
  86                         sessionReg.releaseSession(clientAddress, sessionId);
  87                     } finally {
  88                         PCEPSessionNegotiator.this.channel.close();
  89                     }
  90                 }
  91
  92                 @Override
  93                 public Short getSessionId() {
  94                     return sessionId;
  95                 }
  96             });
  97
  98             this.channel.closeFuture().addListener((ChannelFutureListener) future -> {
  99                 synchronized (lock) {
 100                     sessionReg.removeSessionReference(clientAddress);
 101                 }
 102             });
 103
 104             LOG.info("Replacing bootstrap negotiator for channel {}", this.channel);
 105             this.channel.pipeline().replace(this, "negotiator", n);
 106             n.startNegotiation();
 107         }
 108     }
 109
 110     @Override
 111     protected void handleMessage(final Message msg) {
 112         throw new IllegalStateException("Bootstrap negotiator should have been replaced");
 113     }
 114 }