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HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support
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/*
* Copyright 2018-present HiveMQ and the HiveMQ Community
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hivemq.client.internal.mqtt.handler.subscribe;
import com.hivemq.client.internal.annotations.CallByThread;
import com.hivemq.client.internal.logging.InternalLogger;
import com.hivemq.client.internal.logging.InternalLoggerFactory;
import com.hivemq.client.internal.mqtt.MqttClientConfig;
import com.hivemq.client.internal.mqtt.MqttClientConnectionConfig;
import com.hivemq.client.internal.mqtt.datatypes.MqttUserPropertiesImpl;
import com.hivemq.client.internal.mqtt.handler.MqttSessionAwareHandler;
import com.hivemq.client.internal.mqtt.handler.disconnect.MqttDisconnectUtil;
import com.hivemq.client.internal.mqtt.handler.publish.incoming.MqttGlobalIncomingPublishFlow;
import com.hivemq.client.internal.mqtt.handler.publish.incoming.MqttIncomingPublishFlows;
import com.hivemq.client.internal.mqtt.handler.publish.incoming.MqttSubscribedPublishFlow;
import com.hivemq.client.internal.mqtt.ioc.ClientScope;
import com.hivemq.client.internal.mqtt.message.MqttCommonReasonCode;
import com.hivemq.client.internal.mqtt.message.subscribe.MqttStatefulSubscribe;
import com.hivemq.client.internal.mqtt.message.subscribe.MqttSubscribe;
import com.hivemq.client.internal.mqtt.message.subscribe.suback.MqttSubAck;
import com.hivemq.client.internal.mqtt.message.unsubscribe.MqttStatefulUnsubscribe;
import com.hivemq.client.internal.mqtt.message.unsubscribe.MqttUnsubscribe;
import com.hivemq.client.internal.mqtt.message.unsubscribe.unsuback.MqttUnsubAck;
import com.hivemq.client.internal.mqtt.message.unsubscribe.unsuback.mqtt3.Mqtt3UnsubAckView;
import com.hivemq.client.internal.util.Ranges;
import com.hivemq.client.internal.util.UnsignedDataTypes;
import com.hivemq.client.internal.util.collections.ImmutableList;
import com.hivemq.client.internal.util.collections.IntIndex;
import com.hivemq.client.internal.util.collections.NodeList;
import com.hivemq.client.mqtt.MqttClientState;
import com.hivemq.client.mqtt.mqtt5.exceptions.Mqtt5SubAckException;
import com.hivemq.client.mqtt.mqtt5.exceptions.Mqtt5UnsubAckException;
import com.hivemq.client.mqtt.mqtt5.message.disconnect.Mqtt5DisconnectReasonCode;
import com.hivemq.client.mqtt.mqtt5.message.subscribe.suback.Mqtt5SubAckReasonCode;
import com.hivemq.client.mqtt.mqtt5.message.unsubscribe.unsuback.Mqtt5UnsubAckReasonCode;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.EventLoop;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.inject.Inject;
import java.io.IOException;
/**
* @author Silvio Giebl
*/
@ClientScope
public class MqttSubscriptionHandler extends MqttSessionAwareHandler implements Runnable {
public static final @NotNull String NAME = "subscription";
private static final @NotNull InternalLogger LOGGER =
InternalLoggerFactory.getLogger(MqttSubscriptionHandler.class);
private static final IntIndex.@NotNull Spec INDEX_SPEC =
new IntIndex.Spec<>(x -> x.packetIdentifier, 4);
public static final int MAX_SUB_PENDING = 10; // TODO configurable
private final @NotNull MqttClientConfig clientConfig;
private final @NotNull MqttIncomingPublishFlows incomingPublishFlows;
// valid for session
private final @NotNull NodeList pending = new NodeList<>();
private final @NotNull Ranges packetIdentifiers;
private int nextSubscriptionIdentifier = 1;
// valid for connection
private final @NotNull IntIndex pendingIndex = new IntIndex<>(INDEX_SPEC);
private @Nullable MqttSubOrUnsubWithFlow sendPending, currentPending;
private boolean subscriptionIdentifiersAvailable;
@Inject
MqttSubscriptionHandler(
final @NotNull MqttClientConfig clientConfig,
final @NotNull MqttIncomingPublishFlows incomingPublishFlows) {
this.clientConfig = clientConfig;
this.incomingPublishFlows = incomingPublishFlows;
final int maxPacketIdentifier = UnsignedDataTypes.UNSIGNED_SHORT_MAX_VALUE;
final int minPacketIdentifier = UnsignedDataTypes.UNSIGNED_SHORT_MAX_VALUE - MAX_SUB_PENDING + 1;
packetIdentifiers = new Ranges(minPacketIdentifier, maxPacketIdentifier);
}
@Override
public void onSessionStartOrResume(
final @NotNull MqttClientConnectionConfig connectionConfig, final @NotNull EventLoop eventLoop) {
subscriptionIdentifiersAvailable = connectionConfig.areSubscriptionIdentifiersAvailable();
if (!hasSession) {
incomingPublishFlows.getSubscriptions().forEach((subscriptionIdentifier, subscriptions) -> {
final MqttSubscribe subscribe = new MqttSubscribe(ImmutableList.copyOf(subscriptions),
MqttUserPropertiesImpl.NO_USER_PROPERTIES);
pending.addFirst(new MqttSubscribeWithFlow(subscribe, subscriptionIdentifier, null));
});
}
pendingIndex.clear();
sendPending = pending.getFirst();
if (sendPending != null) {
eventLoop.execute(this);
}
super.onSessionStartOrResume(connectionConfig, eventLoop);
}
public void subscribe(
final @NotNull MqttSubscribe subscribe, final @NotNull MqttSubscriptionFlow flow) {
flow.getEventLoop().execute(() -> {
if (flow.init()) {
final int subscriptionIdentifier = nextSubscriptionIdentifier++;
incomingPublishFlows.subscribe(subscribe, subscriptionIdentifier,
(flow instanceof MqttSubscribedPublishFlow) ? (MqttSubscribedPublishFlow) flow : null);
queue(new MqttSubscribeWithFlow(subscribe, subscriptionIdentifier, flow));
}
});
}
public void unsubscribe(
final @NotNull MqttUnsubscribe unsubscribe, final @NotNull MqttSubOrUnsubAckFlow flow) {
flow.getEventLoop().execute(() -> {
if (flow.init()) {
queue(new MqttUnsubscribeWithFlow(unsubscribe, flow));
}
});
}
public void subscribeGlobal(final @NotNull MqttGlobalIncomingPublishFlow flow) {
flow.getEventLoop().execute(() -> {
if (flow.init()) {
incomingPublishFlows.subscribeGlobal(flow);
}
});
}
private void queue(final @NotNull MqttSubOrUnsubWithFlow subOrUnsubWithFlow) {
pending.add(subOrUnsubWithFlow);
if (sendPending == null) {
sendPending = subOrUnsubWithFlow;
run();
}
}
@CallByThread("Netty EventLoop")
@Override
public void run() {
final ChannelHandlerContext ctx = this.ctx;
if (ctx == null) {
return;
}
int written = 0;
for (MqttSubOrUnsubWithFlow subOrUnsubWithFlow = sendPending;
(subOrUnsubWithFlow != null) && (pendingIndex.size() < MAX_SUB_PENDING);
sendPending = subOrUnsubWithFlow = subOrUnsubWithFlow.getNext()) {
if (subOrUnsubWithFlow.packetIdentifier == 0) {
final int packetIdentifier = packetIdentifiers.getId();
if (packetIdentifier == -1) {
LOGGER.error(
"No Packet Identifier available for (UN)SUBSCRIBE. This must not happen and is a bug.");
return;
}
subOrUnsubWithFlow.packetIdentifier = packetIdentifier;
}
pendingIndex.put(subOrUnsubWithFlow);
if (sendPending instanceof MqttSubscribeWithFlow) {
writeSubscribe(ctx, (MqttSubscribeWithFlow) subOrUnsubWithFlow);
} else {
writeUnsubscribe(ctx, (MqttUnsubscribeWithFlow) subOrUnsubWithFlow);
}
written++;
}
if (written > 0) {
ctx.flush();
}
}
private void writeSubscribe(
final @NotNull ChannelHandlerContext ctx, final @NotNull MqttSubscribeWithFlow subscribeWithFlow) {
final int subscriptionIdentifier = subscriptionIdentifiersAvailable ? subscribeWithFlow.subscriptionIdentifier :
MqttStatefulSubscribe.DEFAULT_NO_SUBSCRIPTION_IDENTIFIER;
final MqttStatefulSubscribe statefulSubscribe =
subscribeWithFlow.subscribe.createStateful(subscribeWithFlow.packetIdentifier, subscriptionIdentifier);
currentPending = subscribeWithFlow;
ctx.write(statefulSubscribe, ctx.voidPromise());
currentPending = null;
}
private void writeUnsubscribe(
final @NotNull ChannelHandlerContext ctx, final @NotNull MqttUnsubscribeWithFlow unsubscribeWithFlow) {
final MqttStatefulUnsubscribe statefulUnsubscribe =
unsubscribeWithFlow.unsubscribe.createStateful(unsubscribeWithFlow.packetIdentifier);
currentPending = unsubscribeWithFlow;
ctx.write(statefulUnsubscribe, ctx.voidPromise());
currentPending = null;
}
@Override
public void channelRead(final @NotNull ChannelHandlerContext ctx, final @NotNull Object msg) {
if (msg instanceof MqttSubAck) {
readSubAck(ctx, (MqttSubAck) msg);
} else if (msg instanceof MqttUnsubAck) {
readUnsubAck(ctx, (MqttUnsubAck) msg);
} else {
ctx.fireChannelRead(msg);
}
}
private void readSubAck(final @NotNull ChannelHandlerContext ctx, final @NotNull MqttSubAck subAck) {
final MqttSubOrUnsubWithFlow subOrUnsubWithFlow = pendingIndex.remove(subAck.getPacketIdentifier());
if (subOrUnsubWithFlow == null) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
"Unknown packet identifier for SUBACK");
return;
}
if (!(subOrUnsubWithFlow instanceof MqttSubscribeWithFlow)) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
"SUBACK received for an UNSUBSCRIBE");
return;
}
final MqttSubscribeWithFlow subscribeWithFlow = (MqttSubscribeWithFlow) subOrUnsubWithFlow;
final MqttSubscriptionFlow flow = subscribeWithFlow.getFlow();
final ImmutableList reasonCodes = subAck.getReasonCodes();
final boolean countNotMatching = subscribeWithFlow.subscribe.getSubscriptions().size() != reasonCodes.size();
final boolean allErrors = MqttCommonReasonCode.allErrors(subAck.getReasonCodes());
incomingPublishFlows.subAck(subscribeWithFlow.subscribe, subscribeWithFlow.subscriptionIdentifier, reasonCodes);
if (flow != null) {
if (!(countNotMatching || allErrors)) {
if (!flow.isCancelled()) {
flow.onSuccess(subAck);
} else {
LOGGER.warn("Subscribe was successful but the SubAck flow has been cancelled");
}
} else {
final String errorMessage;
if (countNotMatching) {
errorMessage = "Count of Reason Codes in SUBACK does not match count of subscriptions in SUBSCRIBE";
} else { // allErrors
errorMessage = "SUBACK contains only Error Codes";
}
if (!flow.isCancelled()) {
flow.onError(new Mqtt5SubAckException(subAck, errorMessage));
} else {
LOGGER.warn(errorMessage + " but the SubAck flow has been cancelled");
}
}
}
completePending(subscribeWithFlow);
}
private void readUnsubAck(final @NotNull ChannelHandlerContext ctx, final @NotNull MqttUnsubAck unsubAck) {
final MqttSubOrUnsubWithFlow subOrUnsubWithFlow = pendingIndex.remove(unsubAck.getPacketIdentifier());
if (subOrUnsubWithFlow == null) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
"Unknown packet identifier for UNSUBACK");
return;
}
if (!(subOrUnsubWithFlow instanceof MqttUnsubscribeWithFlow)) {
MqttDisconnectUtil.disconnect(ctx.channel(), Mqtt5DisconnectReasonCode.PROTOCOL_ERROR,
"UNSUBACK received for a SUBSCRIBE");
return;
}
final MqttUnsubscribeWithFlow unsubscribeWithFlow = (MqttUnsubscribeWithFlow) subOrUnsubWithFlow;
final MqttSubOrUnsubAckFlow flow = unsubscribeWithFlow.getFlow();
final ImmutableList reasonCodes = unsubAck.getReasonCodes();
final boolean countNotMatching = unsubscribeWithFlow.unsubscribe.getTopicFilters().size() != reasonCodes.size();
final boolean allErrors = MqttCommonReasonCode.allErrors(unsubAck.getReasonCodes());
if ((reasonCodes == Mqtt3UnsubAckView.REASON_CODES_ALL_SUCCESS) || !(countNotMatching || allErrors)) {
incomingPublishFlows.unsubscribe(unsubscribeWithFlow.unsubscribe, reasonCodes);
if (!flow.isCancelled()) {
flow.onSuccess(unsubAck);
} else {
LOGGER.warn("Unsubscribe was successful but the UnsubAck flow has been cancelled");
}
} else {
final String errorMessage;
if (countNotMatching) {
errorMessage = "Count of Reason Codes in UNSUBACK does not match count of Topic Filters in UNSUBSCRIBE";
} else { // allErrors
errorMessage = "UNSUBACK contains only Error Codes";
}
if (!flow.isCancelled()) {
flow.onError(new Mqtt5UnsubAckException(unsubAck, errorMessage));
} else {
LOGGER.warn(errorMessage + " but the UnsubAck flow has been cancelled");
}
}
completePending(unsubscribeWithFlow);
}
private void completePending(final @NotNull MqttSubOrUnsubWithFlow oldPending) {
pending.remove(oldPending);
packetIdentifiers.returnId(oldPending.packetIdentifier);
run();
}
@Override
public void exceptionCaught(final @NotNull ChannelHandlerContext ctx, final @NotNull Throwable cause) {
if (!(cause instanceof IOException) && (currentPending != null)) {
pending.remove(currentPending);
packetIdentifiers.returnId(currentPending.packetIdentifier);
pendingIndex.remove(currentPending.packetIdentifier);
final MqttSubscriptionFlow flow = currentPending.getFlow();
if (flow != null) {
flow.onError(cause);
}
if (currentPending instanceof MqttSubscribeWithFlow) {
final MqttSubscribeWithFlow subscribeWithFlow = (MqttSubscribeWithFlow) currentPending;
incomingPublishFlows.subAck(subscribeWithFlow.subscribe, subscribeWithFlow.subscriptionIdentifier,
ImmutableList.of(Mqtt5SubAckReasonCode.UNSPECIFIED_ERROR));
}
currentPending = null;
} else {
ctx.fireExceptionCaught(cause);
}
}
@Override
public void onSessionEnd(final @NotNull Throwable cause) {
super.onSessionEnd(cause);
pendingIndex.clear();
sendPending = null;
for (MqttSubOrUnsubWithFlow current = pending.getFirst(); current != null; current = current.getNext()) {
if (current.packetIdentifier == 0) {
break;
}
packetIdentifiers.returnId(current.packetIdentifier);
current.packetIdentifier = 0;
}
if (clientConfig.isResubscribeIfSessionExpired() && (clientConfig.getState() != MqttClientState.DISCONNECTED)) {
return;
}
incomingPublishFlows.clear(cause);
for (MqttSubOrUnsubWithFlow current = pending.getFirst(); current != null; current = current.getNext()) {
final MqttSubscriptionFlow flow = current.getFlow();
if (flow != null) {
flow.onError(cause);
}
}
pending.clear();
nextSubscriptionIdentifier = 1;
}
}