io.vertx.mqtt.impl.MqttServerImpl.java Source code

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Here is the source code for io.vertx.mqtt.impl.MqttServerImpl.java

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/*
 * Copyright 2016 Red Hat Inc.
 *
 * 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 io.vertx.mqtt.impl;

import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.mqtt.MqttDecoder;
import io.netty.handler.codec.mqtt.MqttEncoder;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.handler.timeout.IdleStateHandler;
import io.vertx.core.AsyncResult;
import io.vertx.core.Handler;
import io.vertx.core.Vertx;
import io.vertx.core.impl.NetSocketInternal;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.core.net.NetServer;
import io.vertx.mqtt.MqttEndpoint;
import io.vertx.mqtt.MqttServer;
import io.vertx.mqtt.MqttServerOptions;

/**
 * An MQTT server implementation
 */
public class MqttServerImpl implements MqttServer {

    private static final Logger log = LoggerFactory.getLogger(MqttServerImpl.class);

    private final NetServer server;
    private Handler<MqttEndpoint> endpointHandler;
    private Handler<Throwable> exceptionHandler;

    private MqttServerOptions options;

    public MqttServerImpl(Vertx vertx, MqttServerOptions options) {
        this.server = vertx.createNetServer(options);
        this.options = options;
    }

    @Override
    public MqttServer listen() {
        return listen(ar -> {
        });
    }

    @Override
    public MqttServer listen(int port, String host) {
        return listen(port, host, ar -> {
        });
    }

    @Override
    public MqttServer listen(int port) {
        return listen(port, ar -> {
        });
    }

    @Override
    public MqttServer listen(int port, Handler<AsyncResult<MqttServer>> listenHandler) {
        return listen(port, this.options.getHost(), listenHandler);
    }

    @Override
    public MqttServer listen(Handler<AsyncResult<MqttServer>> listenHandler) {
        return listen(this.options.getPort(), listenHandler);
    }

    @Override
    public MqttServer listen(int port, String host, Handler<AsyncResult<MqttServer>> listenHandler) {
        Handler<MqttEndpoint> h1 = endpointHandler;
        Handler<Throwable> h2 = exceptionHandler;
        server.connectHandler(so -> {
            NetSocketInternal soi = (NetSocketInternal) so;
            ChannelPipeline pipeline = soi.channelHandlerContext().pipeline();

            initChannel(pipeline);
            MqttServerConnection conn = new MqttServerConnection(soi, options);

            soi.messageHandler(msg -> {
                conn.handleMessage(msg);
            });

            conn.init(h1, h2);

        });
        server.listen(port, host, ar -> listenHandler.handle(ar.map(this)));
        return this;
    }

    @Override
    public synchronized MqttServer endpointHandler(Handler<MqttEndpoint> handler) {
        endpointHandler = handler;
        return this;
    }

    @Override
    public synchronized MqttServer exceptionHandler(Handler<Throwable> handler) {
        exceptionHandler = handler;
        return this;
    }

    @Override
    public int actualPort() {
        return server.actualPort();
    }

    @Override
    public void close() {
        server.close();
    }

    @Override
    public void close(Handler<AsyncResult<Void>> completionHandler) {
        server.close(completionHandler);
    }

    private void initChannel(ChannelPipeline pipeline) {

        pipeline.addBefore("handler", "mqttEncoder", MqttEncoder.INSTANCE);
        if (this.options.getMaxMessageSize() > 0) {
            pipeline.addBefore("handler", "mqttDecoder", new MqttDecoder(this.options.getMaxMessageSize()));
        } else {
            // max message size not set, so the default from Netty MQTT codec is used
            pipeline.addBefore("handler", "mqttDecoder", new MqttDecoder());
        }

        // adding the idle state handler for timeout on CONNECT packet
        pipeline.addBefore("handler", "idle", new IdleStateHandler(this.options.timeoutOnConnect(), 0, 0));
        pipeline.addBefore("handler", "timeoutOnConnect", new ChannelDuplexHandler() {

            @Override
            public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {

                if (evt instanceof IdleStateEvent) {
                    IdleStateEvent e = (IdleStateEvent) evt;
                    if (e.state() == IdleState.READER_IDLE) {
                        // as MQTT 3.1.1 describes, if no packet is sent after a "reasonable" time (here CONNECT timeout)
                        // the connection is closed
                        ctx.channel().close();
                    }
                }
            }
        });
    }
}