| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.onosproject.routing.fpm; |
| |
| import org.jboss.netty.channel.Channel; |
| import org.jboss.netty.channel.ChannelHandlerContext; |
| import org.jboss.netty.channel.ChannelStateEvent; |
| import org.jboss.netty.channel.ExceptionEvent; |
| import org.jboss.netty.channel.MessageEvent; |
| import org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler; |
| import org.jboss.netty.handler.timeout.IdleStateEvent; |
| import org.jboss.netty.handler.timeout.ReadTimeoutException; |
| import org.onosproject.routing.fpm.protocol.FpmHeader; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.net.InetSocketAddress; |
| import java.net.SocketAddress; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Session handler for FPM protocol. |
| */ |
| public class FpmSessionHandler extends IdleStateAwareChannelHandler { |
| |
| private static Logger log = LoggerFactory.getLogger(FpmSessionHandler.class); |
| |
| private final FpmListener fpmListener; |
| |
| private final FpmManager fpmManager; |
| private Channel channel; |
| private FpmPeer us; |
| |
| private boolean useKeepalives; |
| private boolean initialized; |
| |
| /** |
| * Class constructor. |
| * |
| * @param fpmMgr manager |
| * @param fpmListener listener for FPM messages |
| */ |
| public FpmSessionHandler(FpmManager fpmMgr, FpmListener fpmListener) { |
| this.fpmManager = fpmMgr; |
| this.fpmListener = checkNotNull(fpmListener); |
| } |
| |
| @Override |
| public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) |
| throws Exception { |
| FpmHeader fpmMessage = (FpmHeader) e.getMessage(); |
| |
| initConnection(ctx, fpmMessage); |
| |
| fpmListener.fpmMessage(us, fpmMessage); |
| } |
| |
| private void initConnection(ChannelHandlerContext ctx, FpmHeader message) { |
| if (!initialized) { |
| useKeepalives = message.version() >= FpmHeader.FPM_VERSION_ONOS_EXT; |
| if (useKeepalives) { |
| log.info("Using keepalives"); |
| } else { |
| log.info("Not using keepalives"); |
| // Remove the idle channel handler if using a protocol version |
| // with no keepalive messages |
| ctx.getPipeline().remove("idle"); |
| } |
| initialized = true; |
| } |
| } |
| |
| @Override |
| public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) |
| throws Exception { |
| if (e.getCause() instanceof ReadTimeoutException) { |
| log.warn("Haven't heard from FPM client for a while"); |
| } else { |
| log.error("Exception thrown while handling FPM message", e.getCause()); |
| } |
| if (channel != null) { |
| channel.close(); |
| } |
| handleDisconnect(); |
| } |
| |
| @Override |
| public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) |
| throws Exception { |
| SocketAddress socketAddress = ctx.getChannel().getRemoteAddress(); |
| |
| if (!(socketAddress instanceof InetSocketAddress)) { |
| throw new IllegalStateException("Address type is not InetSocketAddress"); |
| } |
| |
| us = FpmPeer.fromSocketAddress((InetSocketAddress) socketAddress); |
| |
| if (!fpmListener.peerConnected(us)) { |
| log.error("Received new FPM connection while already connected"); |
| ctx.getChannel().close(); |
| return; |
| } |
| |
| channel = ctx.getChannel(); |
| fpmManager.addSessionChannel(e.getChannel()); |
| fpmManager.processStaticRoutes(e.getChannel()); |
| } |
| |
| @Override |
| public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) |
| throws Exception { |
| } |
| |
| @Override |
| public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) |
| throws Exception { |
| handleDisconnect(); |
| } |
| |
| @Override |
| public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) |
| throws Exception { |
| fpmManager.removeSessionChannel(e.getChannel()); |
| } |
| |
| private void handleDisconnect() { |
| if (us != null) { |
| fpmListener.peerDisconnected(us); |
| } |
| channel = null; |
| } |
| |
| @Override |
| public void channelIdle(ChannelHandlerContext ctx, IdleStateEvent e) |
| throws Exception { |
| log.warn("FPM channel idle"); |
| if (useKeepalives) { |
| ctx.getChannel().close(); |
| } |
| super.channelIdle(ctx, e); |
| } |
| } |