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cn.wizzer.iot.mqtt.server.broker.protocol.Subscribe Maven / Gradle / Ivy
/**
* Copyright (c) 2018, Mr.Wang ([email protected] ) All rights reserved.
*/
package cn.wizzer.iot.mqtt.server.broker.protocol;
import cn.hutool.core.util.StrUtil;
import cn.wizzer.iot.mqtt.server.common.message.IMessageIdService;
import cn.wizzer.iot.mqtt.server.common.message.IRetainMessageStoreService;
import cn.wizzer.iot.mqtt.server.common.message.RetainMessageStore;
import cn.wizzer.iot.mqtt.server.common.subscribe.ISubscribeStoreService;
import cn.wizzer.iot.mqtt.server.common.subscribe.SubscribeStore;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.handler.codec.mqtt.*;
import io.netty.util.AttributeKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
/**
* SUBSCRIBE连接处理
*/
public class Subscribe {
private static final Logger LOGGER = LoggerFactory.getLogger(Subscribe.class);
private ISubscribeStoreService subscribeStoreService;
private IMessageIdService messageIdService;
private IRetainMessageStoreService retainMessageStoreService;
public Subscribe(ISubscribeStoreService subscribeStoreService, IMessageIdService messageIdService, IRetainMessageStoreService retainMessageStoreService) {
this.subscribeStoreService = subscribeStoreService;
this.messageIdService = messageIdService;
this.retainMessageStoreService = retainMessageStoreService;
}
public void processSubscribe(Channel channel, MqttSubscribeMessage msg) {
List topicSubscriptions = msg.payload().topicSubscriptions();
if (this.validTopicFilter(topicSubscriptions)) {
String clientId = (String) channel.attr(AttributeKey.valueOf("clientId")).get();
List mqttQoSList = new ArrayList();
topicSubscriptions.forEach(topicSubscription -> {
String topicFilter = topicSubscription.topicName();
MqttQoS mqttQoS = topicSubscription.qualityOfService();
SubscribeStore subscribeStore = new SubscribeStore(clientId, topicFilter, mqttQoS.value());
subscribeStoreService.put(topicFilter, subscribeStore);
mqttQoSList.add(mqttQoS.value());
LOGGER.debug("SUBSCRIBE - clientId: {}, topFilter: {}, QoS: {}", clientId, topicFilter, mqttQoS.value());
});
MqttSubAckMessage subAckMessage = (MqttSubAckMessage) MqttMessageFactory.newMessage(
new MqttFixedHeader(MqttMessageType.SUBACK, false, MqttQoS.AT_MOST_ONCE, false, 0),
MqttMessageIdVariableHeader.from(msg.variableHeader().messageId()),
new MqttSubAckPayload(mqttQoSList));
channel.writeAndFlush(subAckMessage);
// 发布保留消息
topicSubscriptions.forEach(topicSubscription -> {
String topicFilter = topicSubscription.topicName();
MqttQoS mqttQoS = topicSubscription.qualityOfService();
this.sendRetainMessage(channel, topicFilter, mqttQoS);
});
} else {
channel.close();
}
}
private boolean validTopicFilter(List topicSubscriptions) {
for (MqttTopicSubscription topicSubscription : topicSubscriptions) {
String topicFilter = topicSubscription.topicName();
// 以#或+符号开头的、以/符号结尾的订阅按非法订阅处理, 这里没有参考标准协议
if (StrUtil.startWith(topicFilter, '+') || StrUtil.endWith(topicFilter, '/'))
return false;
if (StrUtil.contains(topicFilter, '#')) {
// 如果出现多个#符号的订阅按非法订阅处理
if (StrUtil.count(topicFilter, '#') > 1) return false;
}
if (StrUtil.contains(topicFilter, '+')) {
//如果+符号和/+字符串出现的次数不等的情况按非法订阅处理
if (StrUtil.count(topicFilter, '+') != StrUtil.count(topicFilter, "/+")) return false;
}
}
return true;
}
private void sendRetainMessage(Channel channel, String topicFilter, MqttQoS mqttQoS) {
List retainMessageStores = retainMessageStoreService.search(topicFilter);
retainMessageStores.forEach(retainMessageStore -> {
MqttQoS respQoS = retainMessageStore.getMqttQoS() > mqttQoS.value() ? mqttQoS : MqttQoS.valueOf(retainMessageStore.getMqttQoS());
if (respQoS == MqttQoS.AT_MOST_ONCE) {
MqttPublishMessage publishMessage = (MqttPublishMessage) MqttMessageFactory.newMessage(
new MqttFixedHeader(MqttMessageType.PUBLISH, false, respQoS, false, 0),
new MqttPublishVariableHeader(retainMessageStore.getTopic(), 0), Unpooled.buffer().writeBytes(retainMessageStore.getMessageBytes()));
LOGGER.debug("PUBLISH - clientId: {}, topic: {}, Qos: {}", (String) channel.attr(AttributeKey.valueOf("clientId")).get(), retainMessageStore.getTopic(), respQoS.value());
channel.writeAndFlush(publishMessage);
}
if (respQoS == MqttQoS.AT_LEAST_ONCE) {
int messageId = messageIdService.getNextMessageId();
MqttPublishMessage publishMessage = (MqttPublishMessage) MqttMessageFactory.newMessage(
new MqttFixedHeader(MqttMessageType.PUBLISH, false, respQoS, false, 0),
new MqttPublishVariableHeader(retainMessageStore.getTopic(), messageId), Unpooled.buffer().writeBytes(retainMessageStore.getMessageBytes()));
LOGGER.debug("PUBLISH - clientId: {}, topic: {}, Qos: {}, messageId: {}", (String) channel.attr(AttributeKey.valueOf("clientId")).get(), retainMessageStore.getTopic(), respQoS.value(), messageId);
channel.writeAndFlush(publishMessage);
}
if (respQoS == MqttQoS.EXACTLY_ONCE) {
int messageId = messageIdService.getNextMessageId();
MqttPublishMessage publishMessage = (MqttPublishMessage) MqttMessageFactory.newMessage(
new MqttFixedHeader(MqttMessageType.PUBLISH, false, respQoS, false, 0),
new MqttPublishVariableHeader(retainMessageStore.getTopic(), messageId), Unpooled.buffer().writeBytes(retainMessageStore.getMessageBytes()));
LOGGER.debug("PUBLISH - clientId: {}, topic: {}, Qos: {}, messageId: {}", (String) channel.attr(AttributeKey.valueOf("clientId")).get(), retainMessageStore.getTopic(), respQoS.value(), messageId);
channel.writeAndFlush(publishMessage);
}
});
}
}
