com.feingto.iot.client.handler.MqttClientChannelHandler Maven / Gradle / Ivy

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package com.feingto.iot.client.handler;

import com.feingto.iot.client.MqttClient;
import com.feingto.iot.common.handler.DefaultSimpleChannelHandler;
import com.feingto.iot.common.model.mqtt.MqttConnectOptions;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.mqtt.MqttConnAckMessage;
import io.netty.handler.codec.mqtt.MqttMessage;
import io.netty.handler.codec.mqtt.MqttSubAckMessage;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;

import java.util.Optional;
import java.util.concurrent.TimeUnit;

/**
 * MQTT 客户端消息通道处理器
 *
 * @author longfei
 */
@Sharable
public class MqttClientChannelHandler extends DefaultSimpleChannelHandler {
    private final MqttConnectOptions options;
    private final MqttClient mqttClient;

    public MqttClientChannelHandler(MqttConnectOptions options, MqttClient mqttClient) {
        this.options = options;
        this.mqttClient = mqttClient;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        mqttClient.connect(ctx.channel(), options);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        ctx.channel().eventLoop()
                .schedule(mqttClient::reconnect, options.getRetryInterval(), TimeUnit.SECONDS);
        super.channelInactive(ctx);
    }

    @Override
    public void handleMessage(ChannelHandlerContext ctx, MqttMessage msg) {
        Optional.ofNullable(msg.fixedHeader()).ifPresent(fixedHeader -> {
            switch (fixedHeader.messageType()) {
                case CONNACK:
                    mqttClient.connack((MqttConnAckMessage) msg);
                    break;
                case PUBLISH:
                    mqttClient.publish(ctx.channel(), msg);
                    break;
                case PUBACK:
                    mqttClient.puback(ctx.channel(), msg);
                    break;
                case PUBREC:
                    mqttClient.pubrec(ctx.channel(), msg);
                    break;
                case PUBREL:
                    mqttClient.pubrel(ctx.channel(), msg);
                    break;
                case PUBCOMP:
                    mqttClient.pubcomp(ctx.channel(), msg);
                    break;
                case SUBACK:
                    mqttClient.suback(ctx.channel(), (MqttSubAckMessage) msg);
                    break;
                case UNSUBACK:
                    mqttClient.unsubBack(ctx.channel(), msg);
                    break;
                default:
                    break;
            }
        });
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt instanceof IdleStateEvent) {
            IdleStateEvent event = (IdleStateEvent) evt;
            if (event.state() == IdleState.WRITER_IDLE) {
                mqttClient.pingreq(ctx.channel());
            }
        } else {
            super.userEventTriggered(ctx, evt);
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        ctx.channel().eventLoop()
                .schedule(mqttClient::reconnect, options.getRetryInterval(), TimeUnit.SECONDS);
        mqttClient.exceptionCaught(cause);
    }
}