package cn.iocoder.yudao.module.iot.gateway.protocol.mqtt.handler.downstream;
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import cn.hutool.core.lang.Assert;
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import cn.iocoder.yudao.module.iot.core.mq.message.IotDeviceMessage;
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import cn.iocoder.yudao.module.iot.core.util.IotDeviceMessageUtils;
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import cn.iocoder.yudao.module.iot.gateway.protocol.mqtt.manager.IotMqttConnectionManager;
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import cn.iocoder.yudao.module.iot.gateway.service.device.message.IotDeviceMessageService;
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import cn.iocoder.yudao.module.iot.gateway.util.IotMqttTopicUtils;
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import io.netty.handler.codec.mqtt.MqttQoS;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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/**
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* IoT 网关 MQTT 协议:下行消息处理器
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*
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* @author 芋道源码
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*/
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@Slf4j
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@RequiredArgsConstructor
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public class IotMqttDownstreamHandler {
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private final IotDeviceMessageService deviceMessageService;
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private final IotMqttConnectionManager connectionManager;
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/**
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* 处理下行消息
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*
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* @param message 设备消息
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*/
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public void handle(IotDeviceMessage message) {
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try {
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log.info("[handle][处理下行消息,设备 ID: {},方法: {},消息 ID: {}]",
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message.getDeviceId(), message.getMethod(), message.getId());
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// 1. 检查设备连接
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IotMqttConnectionManager.ConnectionInfo connectionInfo = connectionManager.getConnectionInfoByDeviceId(
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message.getDeviceId());
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if (connectionInfo == null) {
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log.warn("[handle][连接信息不存在,设备 ID: {},方法: {},消息 ID: {}]",
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message.getDeviceId(), message.getMethod(), message.getId());
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return;
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}
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// 2.1 序列化消息
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byte[] payload = deviceMessageService.serializeDeviceMessage(message, connectionInfo.getProductKey(),
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connectionInfo.getDeviceName());
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Assert.isTrue(payload != null && payload.length > 0, "消息编码结果不能为空");
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// 2.2 构建主题
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Assert.notBlank(message.getMethod(), "消息方法不能为空");
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boolean isReply = IotDeviceMessageUtils.isReplyMessage(message);
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String topic = IotMqttTopicUtils.buildTopicByMethod(message.getMethod(), connectionInfo.getProductKey(),
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connectionInfo.getDeviceName(), isReply);
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Assert.notBlank(topic, "主题不能为空");
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// 3. 发送到设备
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boolean success = connectionManager.sendToDevice(message.getDeviceId(), topic, payload,
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MqttQoS.AT_LEAST_ONCE.value(), false);
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if (!success) {
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throw new RuntimeException("下行消息发送失败");
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}
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log.info("[handle][下行消息发送成功,设备 ID: {},方法: {},消息 ID: {},主题: {},数据长度: {} 字节]",
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message.getDeviceId(), message.getMethod(), message.getId(), topic, payload.length);
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} catch (Exception e) {
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log.error("[handle][处理下行消息失败,设备 ID: {},方法: {},消息内容: {}]",
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message.getDeviceId(), message.getMethod(), message, e);
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}
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}
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}
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