Moved qos0 publishing logic to separate class

2016-12-13 23:43:01 +01:00
parent c62f549176
commit 12ed805737
2 changed files with 165 additions and 48 deletions
@@ -0,0 +1,137 @@
+package io.moquette.spi.impl;
+
+import io.moquette.parser.proto.messages.AbstractMessage;
+import io.moquette.parser.proto.messages.PublishMessage;
+import io.moquette.server.ConnectionDescriptor;
+import io.moquette.server.netty.NettyUtils;
+import io.moquette.spi.ClientSession;
+import io.moquette.spi.IMessagesStore;
+import io.moquette.spi.ISessionsStore;
+import io.moquette.spi.impl.subscriptions.Subscription;
+import io.moquette.spi.impl.subscriptions.SubscriptionsStore;
+import io.moquette.spi.security.IAuthorizator;
+import io.netty.channel.Channel;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.concurrent.ConcurrentMap;
+
+import static io.moquette.spi.impl.ProtocolProcessor.asStoredMessage;
+
+public class Qos0PublishHandler {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Qos0PublishHandler.class);
+
+    private final IAuthorizator m_authorizator;
+    private final SubscriptionsStore subscriptions;
+    private final IMessagesStore m_messagesStore;
+    private final BrokerInterceptor m_interceptor;
+    private final ConcurrentMap<String, ConnectionDescriptor> connectionDescriptors;
+    private final ISessionsStore m_sessionsStore;
+
+    public Qos0PublishHandler(IAuthorizator authorizator, SubscriptionsStore subscriptions,
+                              IMessagesStore messagesStore, BrokerInterceptor interceptor, ConcurrentMap<String,
+            ConnectionDescriptor> connectionDescriptors, ISessionsStore sessionsStore) {
+        this.m_authorizator = authorizator;
+        this.subscriptions = subscriptions;
+        this.m_messagesStore = messagesStore;
+        this.m_interceptor = interceptor;
+        this.connectionDescriptors = connectionDescriptors;
+        this.m_sessionsStore = sessionsStore;
+    }
+
+    void receivedPublishQos0(Channel channel, PublishMessage msg) {
+        //verify if topic can be write
+        final String topic = msg.getTopicName();
+        if (checkWriteOnTopic(topic, channel)) {
+            return;
+        }
+
+        //route message to subscribers
+        IMessagesStore.StoredMessage toStoreMsg = asStoredMessage(msg);
+        String clientID = NettyUtils.clientID(channel);
+        toStoreMsg.setClientID(clientID);
+
+        List<Subscription> topicMatchingSubscriptions = subscriptions.matches(topic);
+        publish2Subscribers_qos0(toStoreMsg, topicMatchingSubscriptions);
+
+        if (msg.isRetainFlag()) {
+            //QoS == 0 && retain => clean old retained
+            m_messagesStore.cleanRetained(topic);
+        }
+
+        String username = NettyUtils.userName(channel);
+        m_interceptor.notifyTopicPublished(msg, clientID, username);
+    }
+
+    boolean checkWriteOnTopic(String topic, Channel channel) {
+        String clientID = NettyUtils.clientID(channel);
+        String username = NettyUtils.userName(channel);
+        if (!m_authorizator.canWrite(topic, username, clientID)) {
+            LOG.debug("topic {} doesn't have write credentials", topic);
+            return true;
+        }
+        return false;
+    }
+
+    void publish2Subscribers_qos0(IMessagesStore.StoredMessage pubMsg, List<Subscription> topicMatchingSubscriptions) {
+        final String topic = pubMsg.getTopic();
+        final ByteBuffer origMessage = pubMsg.getMessage();
+        LOG.debug("publish2Subscribers republishing to existing subscribers that matches the topic {}", topic);
+        if (LOG.isTraceEnabled()) {
+            LOG.trace("content <{}>", DebugUtils.payload2Str(origMessage));
+            LOG.trace("subscription tree {}", subscriptions.dumpTree());
+        }
+
+        LOG.trace("Found {} matching subscriptions to <{}>", topicMatchingSubscriptions.size(), topic);
+        for (final Subscription sub : topicMatchingSubscriptions) {
+            boolean targetIsActive = connectionDescriptors.containsKey(sub.getClientId());
+
+            LOG.debug("Broker republishing to client <{}> topic <{}> qos <{}>, active {}",
+                    sub.getClientId(), sub.getTopicFilter(), AbstractMessage.QOSType.MOST_ONE, targetIsActive);
+            if (targetIsActive) {
+                ClientSession targetSession = m_sessionsStore.sessionForClient(sub.getClientId());
+                ByteBuffer message = origMessage.duplicate();
+                publishQos0(targetSession, topic, message);
+            }
+        }
+    }
+
+    protected void publishQos0(ClientSession clientsession, String topic, ByteBuffer message) {
+        String clientId = clientsession.clientID;
+
+        LOG.debug("publishQos0 invoked clientId <{}> on topic <{}>", clientId, topic);
+        PublishMessage pubMessage = new PublishMessage();
+        pubMessage.setRetainFlag(false);
+        pubMessage.setTopicName(topic);
+        pubMessage.setQos(AbstractMessage.QOSType.MOST_ONE);
+        pubMessage.setPayload(message);
+
+        LOG.info("send publish message to <{}> on topic <{}>", clientId, topic);
+        if (LOG.isDebugEnabled()) {
+            LOG.debug("content <{}>", DebugUtils.payload2Str(message));
+        }
+
+        if (connectionDescriptors == null) {
+            throw new RuntimeException("Internal bad error, found connectionDescriptors to null while it should be " +
+                    "initialized, somewhere it's overwritten!!");
+        }
+        if (connectionDescriptors.get(clientId) == null) {
+            //TODO while we were publishing to the target client, that client disconnected,
+            // could happen is not an error HANDLE IT
+            throw new RuntimeException(String.format("Can't find a ConnectionDescriptor for client <%s> in cache <%s>",
+                    clientId, connectionDescriptors));
+        }
+        Channel channel = connectionDescriptors.get(clientId).channel;
+        //TODO attention channel could be null, because in the mean time it get closed
+
+        LOG.trace("Session for clientId {}", clientId);
+        if (channel.isWritable()) {
+            LOG.debug("channel is writable");
+            //if channel is writable don't enqueue
+            channel.writeAndFlush(pubMessage);
+        }
+    }
+}