nz.co.fortytwo.signalk.server.CamelUdpNettyHandler.java Source code

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Here is the source code for nz.co.fortytwo.signalk.server.CamelUdpNettyHandler.java

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/*
 * 
 * Copyright (C) 2012-2014 R T Huitema. All Rights Reserved.
 * Web: www.42.co.nz
 * Email: robert@42.co.nz
 * Author: R T Huitema
 * 
 * This file is part of the signalk-server-java project
 * 
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * 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 nz.co.fortytwo.signalk.server;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.util.CharsetUtil;

import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import mjson.Json;
import nz.co.fortytwo.signalk.util.ConfigConstants;
import nz.co.fortytwo.signalk.util.SignalKConstants;
import nz.co.fortytwo.signalk.util.Util;

import org.apache.camel.ProducerTemplate;
import org.apache.camel.component.websocket.WebsocketConstants;
import org.apache.camel.impl.DefaultProducerTemplate;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;

@Sharable
public class CamelUdpNettyHandler extends SimpleChannelInboundHandler<DatagramPacket> {

    private Logger logger = LogManager.getLogger(CamelUdpNettyHandler.class);
    private BiMap<String, InetSocketAddress> sessionList = HashBiMap.create();

    ProducerTemplate producer;

    private String outputType;

    public CamelUdpNettyHandler(String outputType) throws Exception {
        this.outputType = outputType;
        producer = new DefaultProducerTemplate(CamelContextFactory.getInstance());
        producer.setDefaultEndpointUri(RouteManager.SEDA_INPUT);
        producer.start();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        // Send greeting for a new connection.
        NioDatagramChannel udpChannel = (NioDatagramChannel) ctx.channel();
        if (logger.isDebugEnabled())
            logger.debug("channelActive:" + udpChannel.localAddress());

    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) throws Exception {
        String request = packet.content().toString(CharsetUtil.UTF_8);
        if (logger.isDebugEnabled())
            logger.debug("Sender " + packet.sender() + " sent request:" + request);

        if (!sessionList.inverse().containsKey(packet.sender())) {
            String session = UUID.randomUUID().toString();
            String localAddress = ctx.channel().localAddress().toString();
            String remoteAddress = ctx.channel().remoteAddress().toString();
            SubscriptionManagerFactory.getInstance().add(session, session, outputType, localAddress, remoteAddress);
            sessionList.put(session, packet.sender());
            if (logger.isDebugEnabled())
                logger.debug("Added Sender " + packet.sender() + ", session:" + session);
            ctx.channel()
                    .writeAndFlush(new DatagramPacket(
                            Unpooled.copiedBuffer(Util.getWelcomeMsg().toString() + "\r\n", CharsetUtil.UTF_8),
                            packet.sender()));
        }

        Map<String, Object> headers = getHeaders(sessionList.inverse().get(packet.sender()));
        producer.sendBodyAndHeaders(request, headers);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }

    @Override
    public boolean acceptInboundMessage(Object msg) throws Exception {
        if (msg instanceof Json || msg instanceof String)
            return true;
        return super.acceptInboundMessage(msg);
    }

    private Map<String, Object> getHeaders(String wsSession) {
        Map<String, Object> headers = new HashMap<>();
        headers.put(WebsocketConstants.CONNECTION_KEY, wsSession);
        headers.put(SignalKConstants.MSG_SRC_IP, sessionList.get(wsSession).getHostString());
        headers.put(SignalKConstants.MSG_SRC_BUS,
                "udp." + sessionList.get(wsSession).getHostString().replace('.', '_'));
        headers.put(ConfigConstants.OUTPUT_TYPE, outputType);
        return headers;
    }

    protected BiMap<String, InetSocketAddress> getSessionList() {
        return sessionList;
    }
}