bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/BGPDispatcherImpl.java

   1 /*
   2  * Copyright (c) 2013 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.Preconditions;
  11 import io.netty.bootstrap.Bootstrap;
  12 import io.netty.bootstrap.ServerBootstrap;
  13 import io.netty.buffer.PooledByteBufAllocator;
  14 import io.netty.channel.ChannelFuture;
  15 import io.netty.channel.ChannelHandler;
  16 import io.netty.channel.ChannelInitializer;
  17 import io.netty.channel.ChannelOption;
  18 import io.netty.channel.EventLoopGroup;
  19 import io.netty.channel.socket.SocketChannel;
  20 import io.netty.channel.socket.nio.NioServerSocketChannel;
  21 import io.netty.channel.socket.nio.NioSocketChannel;
  22 import io.netty.util.concurrent.DefaultPromise;
  23 import io.netty.util.concurrent.EventExecutor;
  24 import io.netty.util.concurrent.Future;
  25 import io.netty.util.concurrent.GlobalEventExecutor;
  26 import io.netty.util.concurrent.Promise;
  27 import java.net.InetSocketAddress;
  28 import org.opendaylight.protocol.bgp.parser.spi.MessageRegistry;
  29 import org.opendaylight.protocol.bgp.rib.impl.protocol.BGPProtocolSessionPromise;
  30 import org.opendaylight.protocol.bgp.rib.impl.protocol.BGPReconnectPromise;
  31 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPDispatcher;
  32 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPPeerRegistry;
  33 import org.opendaylight.protocol.bgp.rib.impl.spi.ChannelPipelineInitializer;
  34 import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
  35 import org.opendaylight.protocol.bgp.rib.spi.BGPSessionNegotiatorFactory;
  36 import org.opendaylight.protocol.framework.ReconnectStrategy;
  37 import org.opendaylight.protocol.framework.ReconnectStrategyFactory;
  38 import org.opendaylight.tcpmd5.api.KeyMapping;
  39 import org.opendaylight.tcpmd5.netty.MD5ChannelFactory;
  40 import org.opendaylight.tcpmd5.netty.MD5ChannelOption;
  41 import org.opendaylight.tcpmd5.netty.MD5ServerChannelFactory;
  42 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.AsNumber;
  43 import org.slf4j.Logger;
  44 import org.slf4j.LoggerFactory;
  45
  46 /**
  47  * Implementation of BGPDispatcher.
  48  */
  49 public class BGPDispatcherImpl implements BGPDispatcher, AutoCloseable {
  50     private static final Logger LOG = LoggerFactory.getLogger(BGPDispatcherImpl.class);
  51     private static final int SOCKET_BACKLOG_SIZE = 128;
  52     private final MD5ServerChannelFactory<?> scf;
  53     private final MD5ChannelFactory<?> cf;
  54     private final BGPHandlerFactory hf;
  55     private final EventLoopGroup bossGroup;
  56     private final EventLoopGroup workerGroup;
  57     private final EventExecutor executor;
  58     private KeyMapping keys;
  59
  60     public BGPDispatcherImpl(final MessageRegistry messageRegistry, final EventLoopGroup bossGroup, final EventLoopGroup workerGroup) {
  61         this(messageRegistry, bossGroup, workerGroup, null, null);
  62     }
  63
  64     public BGPDispatcherImpl(final MessageRegistry messageRegistry, final EventLoopGroup bossGroup, final EventLoopGroup workerGroup, final MD5ChannelFactory<?> cf, final MD5ServerChannelFactory<?> scf) {
  65         this.bossGroup = Preconditions.checkNotNull(bossGroup);
  66         this.workerGroup = Preconditions.checkNotNull(workerGroup);
  67         this.executor = Preconditions.checkNotNull(GlobalEventExecutor.INSTANCE);
  68         this.hf = new BGPHandlerFactory(messageRegistry);
  69         this.cf = cf;
  70         this.scf = scf;
  71         this.keys = null;
  72     }
  73
  74     @Override
  75     public synchronized Future<BGPSessionImpl> createClient(final InetSocketAddress address,
  76                                                             final AsNumber remoteAs, final BGPPeerRegistry listener, final ReconnectStrategy strategy) {
  77         final BGPClientSessionNegotiatorFactory snf = new BGPClientSessionNegotiatorFactory(remoteAs, listener);
  78         final ChannelPipelineInitializer initializer = BGPChannel.createChannelPipelineInitializer
  79             (BGPDispatcherImpl.this.hf.getDecoders(), snf, BGPDispatcherImpl.this.hf.getEncoders());
  80
  81         final Bootstrap b = new Bootstrap();
  82         final BGPProtocolSessionPromise p = new BGPProtocolSessionPromise(this.executor, address, strategy, b);
  83         b.option(ChannelOption.SO_KEEPALIVE, Boolean.TRUE);
  84         b.handler(BGPChannel.createChannelInitializer(initializer, p));
  85         this.customizeBootstrap(b);
  86         setWorkerGroup(b);
  87         p.connect();
  88         LOG.debug("Client created.");
  89         return p;
  90     }
  91
  92     @Override
  93     public void close() {
  94         try {
  95             this.workerGroup.shutdownGracefully();
  96         } finally {
  97             this.bossGroup.shutdownGracefully();
  98         }
  99     }
 100
 101     @Override
 102     public synchronized Future<Void> createReconnectingClient(final InetSocketAddress address,
 103                                                               final AsNumber remoteAs, final BGPPeerRegistry peerRegistry, final ReconnectStrategyFactory connectStrategyFactory,
 104                                                               final KeyMapping keys) {
 105         final BGPClientSessionNegotiatorFactory snf = new BGPClientSessionNegotiatorFactory(remoteAs, peerRegistry);
 106         this.keys = keys;
 107
 108         final Bootstrap b = new Bootstrap();
 109         final BGPReconnectPromise p = new BGPReconnectPromise<BGPSessionImpl>(GlobalEventExecutor.INSTANCE, address,
 110             connectStrategyFactory, b, BGPChannel.createChannelPipelineInitializer(BGPDispatcherImpl.this.hf.getDecoders(), snf, BGPDispatcherImpl.this.hf.getEncoders()));
 111         b.option(ChannelOption.SO_KEEPALIVE, Boolean.TRUE);
 112         this.customizeBootstrap(b);
 113         setWorkerGroup(b);
 114         p.connect();
 115
 116         this.keys = null;
 117
 118         return p;
 119     }
 120
 121     @Override
 122     public ChannelFuture createServer(final BGPPeerRegistry registry, final InetSocketAddress address) {
 123         final BGPServerSessionNegotiatorFactory snf = new BGPServerSessionNegotiatorFactory(registry);
 124         final ChannelPipelineInitializer initializer = BGPChannel.createChannelPipelineInitializer
 125             (BGPDispatcherImpl.this.hf.getDecoders(), snf, BGPDispatcherImpl.this.hf.getEncoders());
 126         final ServerBootstrap b = new ServerBootstrap();
 127         b.childHandler(BGPChannel.createChannelInitializer(initializer, new DefaultPromise(BGPDispatcherImpl.this.executor)));
 128         b.option(ChannelOption.SO_BACKLOG, Integer.valueOf(SOCKET_BACKLOG_SIZE));
 129         b.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
 130         this.customizeBootstrap(b);
 131
 132         final ChannelFuture f = b.bind(address);
 133         LOG.debug("Initiated server {} at {}.", f, address);
 134         return f;
 135     }
 136
 137     protected void customizeBootstrap(final Bootstrap b) {
 138         if (this.keys != null && !this.keys.isEmpty()) {
 139             if (this.cf == null) {
 140                 throw new UnsupportedOperationException("No key access instance available, cannot use key mapping");
 141             }
 142             b.channelFactory(this.cf);
 143             b.option(MD5ChannelOption.TCP_MD5SIG, this.keys);
 144         }
 145
 146         // Make sure we are doing round-robin processing
 147         b.option(ChannelOption.MAX_MESSAGES_PER_READ, 1);
 148     }
 149
 150     private void customizeBootstrap(final ServerBootstrap b) {
 151         if (this.keys != null && !this.keys.isEmpty()) {
 152             if (this.scf == null) {
 153                 throw new UnsupportedOperationException("No key access instance available, cannot use key mapping");
 154             }
 155             b.channelFactory(this.scf);
 156             b.option(MD5ChannelOption.TCP_MD5SIG, this.keys);
 157         }
 158
 159         // Make sure we are doing round-robin processing
 160         b.option(ChannelOption.MAX_MESSAGES_PER_READ, 1);
 161
 162         if (b.group() == null) {
 163             b.group(this.bossGroup, this.workerGroup);
 164         }
 165
 166         try {
 167             b.channel(NioServerSocketChannel.class);
 168         } catch (final IllegalStateException e) {
 169             LOG.trace("Not overriding channelFactory on bootstrap {}", b, e);
 170         }
 171     }
 172
 173     private void setWorkerGroup(final Bootstrap b) {
 174         if (b.group() == null) {
 175             b.group(this.workerGroup);
 176         }
 177         try {
 178             b.channel(NioSocketChannel.class);
 179         } catch (final IllegalStateException e) {
 180             LOG.trace("Not overriding channelFactory on bootstrap {}", b, e);
 181         }
 182     }
 183
 184     private static final class BGPChannel {
 185         private static final String NEGOTIATOR = "negotiator";
 186
 187         private BGPChannel() {
 188
 189         }
 190
 191         public static <S extends BGPSession, T extends BGPSessionNegotiatorFactory> ChannelPipelineInitializer
 192             createChannelPipelineInitializer(final ChannelHandler[] channelDecoder, final T snf, final ChannelHandler[] channelEncoder) {
 193             return new ChannelPipelineInitializer<S>() {
 194                 @Override
 195                 public void initializeChannel(final SocketChannel ch, final Promise<S> promise) {
 196                     ch.pipeline().addLast(channelDecoder);
 197                     ch.pipeline().addLast(NEGOTIATOR, snf.getSessionNegotiator(ch, promise));
 198                     ch.pipeline().addLast(channelEncoder);
 199                 }
 200             };
 201         }
 202
 203         public static <S extends BGPSession> ChannelHandler createChannelInitializer(final ChannelPipelineInitializer initializer, final Promise<S> promise) {
 204             return new ChannelInitializer<SocketChannel>() {
 205                 @Override
 206                 protected void initChannel(final SocketChannel ch) {
 207                     initializer.initializeChannel(ch, promise);
 208                 }
 209             };
 210         }
 211     }
 212 }