| /* |
| * Copyright 2015-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.bgp.controller.impl; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.channel.Channel; |
| import org.jboss.netty.channel.ChannelHandlerContext; |
| import org.jboss.netty.handler.codec.frame.FrameDecoder; |
| import org.onosproject.bgpio.protocol.BgpMessage; |
| import org.onosproject.bgpio.protocol.BgpFactories; |
| import org.onosproject.bgpio.protocol.BgpMessageReader; |
| import org.onosproject.bgpio.types.BgpHeader; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Decode an bgp message from a Channel, for use in a netty pipeline. |
| */ |
| public class BgpMessageDecoder extends FrameDecoder { |
| |
| protected static final Logger log = LoggerFactory.getLogger(BgpMessageDecoder.class); |
| |
| @Override |
| protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception { |
| log.debug("MESSAGE IS RECEIVED."); |
| if (!channel.isConnected()) { |
| log.info("Channel is not connected."); |
| return null; |
| } |
| |
| HexDump.dump(buffer); |
| |
| BgpMessageReader<BgpMessage> reader = BgpFactories.getGenericReader(); |
| List<BgpMessage> msgList = (List<BgpMessage>) ctx.getAttachment(); |
| |
| if (msgList == null) { |
| msgList = new LinkedList<>(); |
| } |
| |
| try { |
| while (buffer.readableBytes() > 0) { |
| buffer.markReaderIndex(); |
| BgpHeader bgpHeader = new BgpHeader(); |
| BgpMessage message = reader.readFrom(buffer, bgpHeader); |
| msgList.add(message); |
| } |
| ctx.setAttachment(null); |
| return msgList; |
| } catch (Exception e) { |
| log.debug("Bgp protocol message decode error"); |
| buffer.resetReaderIndex(); |
| buffer.discardReadBytes(); |
| ctx.setAttachment(msgList); |
| } |
| return null; |
| } |
| } |