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

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Here is the source code for nz.co.fortytwo.signalk.server.CamelNettyHandler.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.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.util.AttributeKey;

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.Exchange;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.component.websocket.WebsocketConstants;
import org.apache.camel.impl.DefaultExchange;
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 CamelNettyHandler extends SimpleChannelInboundHandler<String> {

    private Logger logger = LogManager.getLogger(CamelNettyHandler.class);
    private BiMap<String, ChannelHandlerContext> contextList = HashBiMap.create();
    private String outputType;
    //@Produce(uri = RouteManager.SEDA_INPUT)
    ProducerTemplate producer;

    private final AttributeKey<Map<String, Object>> msgHeaders = AttributeKey.valueOf("msgHeaders");

    public CamelNettyHandler(String outputType) throws Exception {
        this.outputType = outputType;
        producer = CamelContextFactory.getInstance().createProducerTemplate();
        producer.setDefaultEndpointUri(RouteManager.SEDA_INPUT);
        producer.start();

    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        // Send greeting for a new connection.
        ctx.write(Util.getWelcomeMsg().toString() + "\r\n");
        ctx.flush();
        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);
        contextList.put(session, ctx);
        //make up headers
        ctx.attr(msgHeaders).set(getHeaders(ctx));

    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        // unsubscribe all
        String session = contextList.inverse().get(ctx);
        SubscriptionManagerFactory.getInstance().removeSessionId(session);
        super.channelInactive(ctx);
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String request) throws Exception {
        if (logger.isDebugEnabled())
            logger.debug("Request:" + request);
        Exchange ex = new DefaultExchange(CamelContextFactory.getInstance());
        ex.getIn().setBody(request);
        ex.getIn().getHeaders().putAll(ctx.attr(msgHeaders).get());
        producer.asyncSend(producer.getDefaultEndpoint(), ex);
    }

    private Map<String, Object> getHeaders(ChannelHandlerContext ctx) throws Exception {
        Map<String, Object> headers = new HashMap<>();
        headers.put(WebsocketConstants.CONNECTION_KEY, contextList.inverse().get(ctx));
        String remoteAddress = ctx.channel().remoteAddress().toString();
        headers.put(SignalKConstants.MSG_SRC_IP, remoteAddress);
        headers.put(SignalKConstants.MSG_SRC_BUS, "tcp." + remoteAddress.replace('.', '_'));
        headers.put(ConfigConstants.OUTPUT_TYPE, outputType);
        String localAddress = ctx.channel().localAddress().toString();

        if (Util.sameNetwork(localAddress, remoteAddress)) {
            headers.put(SignalKConstants.MSG_TYPE, SignalKConstants.INTERNAL_IP);
        } else {
            headers.put(SignalKConstants.MSG_TYPE, SignalKConstants.EXTERNAL_IP);
        }
        return headers;
    }

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

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

    public ChannelHandlerContext getChannel(String sessionId) {
        return contextList.get(sessionId);
    }

    public Map<String, ChannelHandlerContext> getContextList() {
        return contextList;
    }

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

}