224 lines
10 KiB
Java
224 lines
10 KiB
Java
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package io.moquette.spi.impl;
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import io.moquette.parser.proto.messages.*;
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import io.moquette.server.ConnectionDescriptor;
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import io.moquette.server.netty.NettyUtils;
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import io.moquette.spi.ClientSession;
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import io.moquette.spi.IMessagesStore;
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import io.moquette.spi.ISessionsStore;
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import io.moquette.spi.MessageGUID;
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import io.moquette.spi.impl.subscriptions.Subscription;
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import io.moquette.spi.impl.subscriptions.SubscriptionsStore;
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import io.moquette.spi.security.IAuthorizator;
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import io.netty.channel.Channel;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.nio.ByteBuffer;
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import java.util.List;
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import java.util.concurrent.ConcurrentMap;
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import static io.moquette.spi.impl.ProtocolProcessor.asStoredMessage;
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import static io.moquette.spi.impl.ProtocolProcessor.lowerQosToTheSubscriptionDesired;
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public class Qos2PublishHandler {
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private static final Logger LOG = LoggerFactory.getLogger(Qos1PublishHandler.class);
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private final IAuthorizator m_authorizator;
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private final SubscriptionsStore subscriptions;
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private final IMessagesStore m_messagesStore;
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private final BrokerInterceptor m_interceptor;
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private final ConcurrentMap<String, ConnectionDescriptor> connectionDescriptors;
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private final ISessionsStore m_sessionsStore;
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private final String brokerPort;
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public Qos2PublishHandler(IAuthorizator authorizator, SubscriptionsStore subscriptions,
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IMessagesStore messagesStore, BrokerInterceptor interceptor, ConcurrentMap<String,
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ConnectionDescriptor> connectionDescriptors, ISessionsStore sessionsStore, String brokerPort) {
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this.m_authorizator = authorizator;
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this.subscriptions = subscriptions;
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this.m_messagesStore = messagesStore;
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this.m_interceptor = interceptor;
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this.connectionDescriptors = connectionDescriptors;
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this.m_sessionsStore = sessionsStore;
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this.brokerPort = brokerPort;
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}
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void receivedPublishQos2(Channel channel, PublishMessage msg) {
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final AbstractMessage.QOSType qos = AbstractMessage.QOSType.EXACTLY_ONCE;
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final String topic = msg.getTopicName();
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//check if the topic can be wrote
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if (checkWriteOnTopic(topic, channel)) {
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return;
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}
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final Integer messageID = msg.getMessageID();
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IMessagesStore.StoredMessage toStoreMsg = asStoredMessage(msg);
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String clientID = NettyUtils.clientID(channel);
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toStoreMsg.setClientID(clientID);
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LOG.info("PUBLISH on server {} from clientID <{}> on topic <{}> with QoS {}", this.brokerPort, clientID, topic, qos);
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//QoS2
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MessageGUID guid = m_messagesStore.storePublishForFuture(toStoreMsg);
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if (msg.isLocal()) {
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sendPubRec(clientID, messageID);
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}
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//Next the client will send us a pub rel
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//NB publish to subscribers for QoS 2 happen upon PUBREL from publisher
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if (msg.isRetainFlag()) {
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if (!msg.getPayload().hasRemaining()) {
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m_messagesStore.cleanRetained(topic);
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} else {
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m_messagesStore.storeRetained(topic, guid);
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}
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}
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String username = NettyUtils.userName(channel);
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m_interceptor.notifyTopicPublished(msg, clientID, username);
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}
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/**
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* Second phase of a publish QoS2 protocol, sent by publisher to the broker. Search the stored message and publish
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* to all interested subscribers.
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* */
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void processPubRel(Channel channel, PubRelMessage msg) {
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String clientID = NettyUtils.clientID(channel);
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int messageID = msg.getMessageID();
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LOG.debug("PUB --PUBREL--> SRV processPubRel invoked for clientID {} ad messageID {}", clientID, messageID);
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ClientSession targetSession = m_sessionsStore.sessionForClient(clientID);
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IMessagesStore.StoredMessage evt = targetSession.storedMessage(messageID);
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final String topic = evt.getTopic();
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List<Subscription> topicMatchingSubscriptions = subscriptions.matches(topic);
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publish2Subscribers(evt, topicMatchingSubscriptions);
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if (evt.isRetained()) {
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if (!evt.getMessage().hasRemaining()) {
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m_messagesStore.cleanRetained(topic);
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} else {
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m_messagesStore.storeRetained(topic, evt.getGuid());
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}
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}
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sendPubComp(clientID, messageID);
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}
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private boolean checkWriteOnTopic(String topic, Channel channel) {
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String clientID = NettyUtils.clientID(channel);
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String username = NettyUtils.userName(channel);
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if (!m_authorizator.canWrite(topic, username, clientID)) {
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LOG.debug("topic {} doesn't have write credentials", topic);
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return true;
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}
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return false;
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}
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private void sendPubRec(String clientID, int messageID) {
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LOG.trace("PUB <--PUBREC-- SRV sendPubRec invoked for clientID {} with messageID {}", clientID, messageID);
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PubRecMessage pubRecMessage = new PubRecMessage();
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pubRecMessage.setMessageID(messageID);
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connectionDescriptors.get(clientID).channel.writeAndFlush(pubRecMessage);
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}
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void publish2Subscribers(IMessagesStore.StoredMessage pubMsg, List<Subscription> topicMatchingSubscriptions) {
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final String topic = pubMsg.getTopic();
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final AbstractMessage.QOSType publishingQos = pubMsg.getQos();
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final ByteBuffer origMessage = pubMsg.getMessage();
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LOG.debug("publish2Subscribers republishing to existing subscribers that matches the topic {}", topic);
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if (LOG.isTraceEnabled()) {
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LOG.trace("content <{}>", DebugUtils.payload2Str(origMessage));
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LOG.trace("subscription tree {}", subscriptions.dumpTree());
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}
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//if QoS 1 or 2 store the message
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MessageGUID guid = null;
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if (publishingQos != AbstractMessage.QOSType.MOST_ONE) {
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guid = m_messagesStore.storePublishForFuture(pubMsg);
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}
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LOG.trace("Found {} matching subscriptions to <{}>", topicMatchingSubscriptions.size(), topic);
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for (final Subscription sub : topicMatchingSubscriptions) {
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AbstractMessage.QOSType qos = lowerQosToTheSubscriptionDesired(sub, publishingQos);
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ClientSession targetSession = m_sessionsStore.sessionForClient(sub.getClientId());
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boolean targetIsActive = this.connectionDescriptors.containsKey(sub.getClientId());
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LOG.debug("Broker republishing to client <{}> topic <{}> qos <{}>, active {}",
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sub.getClientId(), sub.getTopicFilter(), qos, targetIsActive);
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ByteBuffer message = origMessage.duplicate();
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if (qos == AbstractMessage.QOSType.MOST_ONE && targetIsActive) {
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//QoS 0
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publishQos2(targetSession, topic, qos, message, false, null);
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} else {
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//QoS 1 or 2
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//if the target subscription is not clean session and is not connected => store it
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if (!targetSession.isCleanSession() && !targetIsActive) {
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//store the message in targetSession queue to deliver
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targetSession.enqueueToDeliver(guid);
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} else {
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//publish
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if (targetIsActive) {
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int messageId = targetSession.nextPacketId();
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targetSession.inFlightAckWaiting(guid, messageId);
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publishQos2(targetSession, topic, qos, message, false, messageId);
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}
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}
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}
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}
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}
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private void publishQos2(ClientSession clientsession, String topic, AbstractMessage.QOSType qos,
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ByteBuffer message, boolean retained, Integer messageID) {
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String clientId = clientsession.clientID;
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LOG.debug("directSend invoked clientId <{}> on topic <{}> QoS {} retained {} messageID {}",
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clientId, topic, qos, retained, messageID);
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PublishMessage pubMessage = new PublishMessage();
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pubMessage.setRetainFlag(retained);
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pubMessage.setTopicName(topic);
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pubMessage.setQos(qos);
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pubMessage.setPayload(message);
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LOG.info("send publish message to <{}> on topic <{}>", clientId, topic);
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if (LOG.isDebugEnabled()) {
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LOG.debug("content <{}>", DebugUtils.payload2Str(message));
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}
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//set the PacketIdentifier only for QoS > 0
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if (pubMessage.getQos() != AbstractMessage.QOSType.MOST_ONE) {
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pubMessage.setMessageID(messageID);
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} else {
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if (messageID != null) {
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throw new RuntimeException("Internal bad error, trying to forwardPublish a QoS 0 message " +
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"with PacketIdentifier: " + messageID);
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}
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}
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if (connectionDescriptors == null) {
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throw new RuntimeException("Internal bad error, found connectionDescriptors to null while it should be " +
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"initialized, somewhere it's overwritten!!");
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}
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if (connectionDescriptors.get(clientId) == null) {
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//TODO while we were publishing to the target client, that client disconnected,
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// could happen is not an error HANDLE IT
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throw new RuntimeException(String.format("Can't find a ConnectionDescriptor for client <%s> in cache <%s>",
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clientId, connectionDescriptors));
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}
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Channel channel = connectionDescriptors.get(clientId).channel;
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LOG.trace("Session for clientId {}", clientId);
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if (channel.isWritable()) {
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LOG.debug("channel is writable");
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//if channel is writable don't enqueue
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channel.writeAndFlush(pubMessage);
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} else {
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//enqueue to the client session
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LOG.debug("enqueue to client session");
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clientsession.enqueue(pubMessage);
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}
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}
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private void sendPubComp(String clientID, int messageID) {
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LOG.debug("PUB <--PUBCOMP-- SRV sendPubComp invoked for clientID {} ad messageID {}", clientID, messageID);
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PubCompMessage pubCompMessage = new PubCompMessage();
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pubCompMessage.setMessageID(messageID);
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connectionDescriptors.get(clientID).channel.writeAndFlush(pubCompMessage);
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}
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}
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