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.primitives.UnsignedBytes;
  11 import io.netty.channel.Channel;
  12 import io.netty.channel.ChannelFutureListener;
  13 import io.netty.util.concurrent.Promise;
  14 import java.net.InetSocketAddress;
  15 import java.util.Comparator;
  16 import java.util.Optional;
  17 import java.util.concurrent.ExecutionException;
  18 import org.opendaylight.protocol.pcep.PCEPSessionNegotiatorFactoryDependencies;
  19 import org.opendaylight.protocol.pcep.impl.PCEPPeerRegistry.SessionReference;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev181109.Message;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 public class PCEPSessionNegotiator extends AbstractSessionNegotiator {
  25
  26     private static final Logger LOG = LoggerFactory.getLogger(PCEPSessionNegotiator.class);
  27
  28     private static final Comparator<byte[]> COMPARATOR = UnsignedBytes.lexicographicalComparator();
  29     private final AbstractPCEPSessionNegotiatorFactory negFactory;
  30     private final PCEPSessionNegotiatorFactoryDependencies nfd;
  31
  32     public PCEPSessionNegotiator(final Channel channel, final Promise<PCEPSessionImpl> promise,
  33             final PCEPSessionNegotiatorFactoryDependencies dependencies,
  34             final AbstractPCEPSessionNegotiatorFactory negFactory) {
  35         super(promise, channel);
  36         this.nfd = dependencies;
  37         this.negFactory = negFactory;
  38     }
  39
  40     @Override
  41     @SuppressWarnings("checkstyle:IllegalCatch")
  42     //similar to bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/AbstractBGPSessionNegotiator.java
  43     protected void startNegotiation() throws ExecutionException {
  44         final Object lock = this;
  45
  46         LOG.debug("Bootstrap negotiation for channel {} started", this.channel);
  47
  48         /*
  49          * We have a chance to see if there's a client session already
  50          * registered for this client.
  51          */
  52         final byte[] clientAddress = ((InetSocketAddress) this.channel.remoteAddress()).getAddress().getAddress();
  53         final PCEPPeerRegistry sessionReg = this.negFactory.getSessionRegistry();
  54
  55         synchronized (lock) {
  56             if (sessionReg.getSessionReference(clientAddress).isPresent()) {
  57                 final byte[] serverAddress =
  58                     ((InetSocketAddress) this.channel.localAddress()).getAddress().getAddress();
  59                 if (COMPARATOR.compare(serverAddress, clientAddress) > 0) {
  60                     final Optional<SessionReference> sessionRefMaybe = sessionReg.removeSessionReference(clientAddress);
  61                     try {
  62                         if (sessionRefMaybe.isPresent()) {
  63                             sessionRefMaybe.get().close();
  64                         }
  65                     } catch (final Exception e) {
  66                         LOG.error("Unexpected failure to close old session", e);
  67                     }
  68                 } else {
  69                     negotiationFailed(new IllegalStateException("A conflicting session for address "
  70                             + ((InetSocketAddress) this.channel.remoteAddress()).getAddress() + " found."));
  71                     return;
  72                 }
  73             }
  74
  75             final Short sessionId = sessionReg.nextSession(clientAddress);
  76             final AbstractPCEPSessionNegotiator n = this.negFactory
  77                     .createNegotiator(this.nfd, this.promise, this.channel, sessionId);
  78
  79             sessionReg.putSessionReference(clientAddress, new SessionReference() {
  80                 @Override
  81                 public void close() throws ExecutionException {
  82                     try {
  83                         sessionReg.releaseSession(clientAddress, sessionId);
  84                     } finally {
  85                         PCEPSessionNegotiator.this.channel.close();
  86                     }
  87                 }
  88
  89                 @Override
  90                 public Short getSessionId() {
  91                     return sessionId;
  92                 }
  93             });
  94
  95             this.channel.closeFuture().addListener((ChannelFutureListener) future -> {
  96                 synchronized (lock) {
  97                     sessionReg.removeSessionReference(clientAddress);
  98                 }
  99             });
 100
 101             LOG.info("Replacing bootstrap negotiator for channel {}", this.channel);
 102             this.channel.pipeline().replace(this, "negotiator", n);
 103             n.startNegotiation();
 104         }
 105     }
 106
 107     @Override
 108     protected void handleMessage(final Message msg) {
 109         throw new IllegalStateException("Bootstrap negotiator should have been replaced");
 110     }
 111 }