/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.flume.source;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.flume.ChannelException;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.EventDrivenSource;
import org.apache.flume.conf.Configurable;
import org.apache.flume.source.SyslogUtils;
import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.jboss.netty.channel.socket.oio.OioDatagramChannelFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SyslogUDPSource extends AbstractSource
implements EventDrivenSource, Configurable {
final public static int SYSLOG_UDP_PORT = 514;
private int port = SYSLOG_UDP_PORT; // default udp syslog port
private int maxsize = 1 << 16; // 64k is max allowable in RFC 5426
private String host = null;
private Channel nettyChannel;
private static final Logger logger = LoggerFactory
.getLogger(SyslogUDPSource.class);
public class syslogHandler extends SimpleChannelHandler {
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent mEvent) {
try {
Event e = SyslogUtils.extractEvent((ChannelBuffer)mEvent.getMessage());
if (e == null) {
return;
}
getChannelProcessor().processEvent(e);
} catch (ChannelException ex) {
logger.error("Error writting to channel", ex);
return;
} catch (IOException eI) {
logger.error("Error reading from network", eI);
}
}
}
@Override
public void start() {
// setup Netty server
ConnectionlessBootstrap serverBootstrap = new ConnectionlessBootstrap
(new OioDatagramChannelFactory(Executors.newCachedThreadPool()));
serverBootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() {
return Channels.pipeline(new syslogHandler());
}
});
if (host == null) {
nettyChannel = serverBootstrap.bind(new InetSocketAddress(port));
} else {
nettyChannel = serverBootstrap.bind(new InetSocketAddress(host, port));
}
super.start();
}
@Override
public void stop() {
if (nettyChannel != null) {
nettyChannel.close();
try {
nettyChannel.getCloseFuture().await(60, TimeUnit.SECONDS);
} catch (InterruptedException e) {
logger.warn("netty server stop interrupted", e);
} finally {
nettyChannel = null;
}
}
super.stop();
}
@Override
public void configure(Context context) {
port = Integer.parseInt(context.getString("port"));
host = context.getString("host");
}
}