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   1 /**
   2  * Copyright (c) 2010-2022 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.mqtt.generic.internal.handler;
  14
  15 import java.util.ArrayList;
  16 import java.util.HashMap;
  17 import java.util.List;
  18 import java.util.Map;
  19 import java.util.Optional;
  20 import java.util.concurrent.CompletableFuture;
  21 import java.util.stream.Collectors;
  22
  23 import org.eclipse.jdt.annotation.NonNullByDefault;
  24 import org.eclipse.jdt.annotation.Nullable;
  25 import org.openhab.binding.mqtt.generic.AbstractMQTTThingHandler;
  26 import org.openhab.binding.mqtt.generic.ChannelConfig;
  27 import org.openhab.binding.mqtt.generic.ChannelState;
  28 import org.openhab.binding.mqtt.generic.ChannelStateUpdateListener;
  29 import org.openhab.binding.mqtt.generic.MqttChannelStateDescriptionProvider;
  30 import org.openhab.binding.mqtt.generic.TransformationServiceProvider;
  31 import org.openhab.binding.mqtt.generic.utils.FutureCollector;
  32 import org.openhab.binding.mqtt.generic.values.Value;
  33 import org.openhab.binding.mqtt.generic.values.ValueFactory;
  34 import org.openhab.core.io.transport.mqtt.MqttBrokerConnection;
  35 import org.openhab.core.thing.Channel;
  36 import org.openhab.core.thing.ChannelUID;
  37 import org.openhab.core.thing.Thing;
  38 import org.openhab.core.thing.ThingStatus;
  39 import org.openhab.core.thing.ThingStatusDetail;
  40 import org.openhab.core.thing.type.ChannelTypeUID;
  41 import org.openhab.core.types.StateDescription;
  42 import org.slf4j.Logger;
  43 import org.slf4j.LoggerFactory;
  44
  45 /**
  46  * This handler manages manual created Things with manually added channels to link to MQTT topics.
  47  *
  48  * @author David Graeff - Initial contribution
  49  */
  50 @NonNullByDefault
  51 public class GenericMQTTThingHandler extends AbstractMQTTThingHandler implements ChannelStateUpdateListener {
  52     private final Logger logger = LoggerFactory.getLogger(GenericMQTTThingHandler.class);
  53     final Map<ChannelUID, ChannelState> channelStateByChannelUID = new HashMap<>();
  54     protected final MqttChannelStateDescriptionProvider stateDescProvider;
  55     protected final TransformationServiceProvider transformationServiceProvider;
  56
  57     /**
  58      * Creates a new Thing handler for generic MQTT channels.
  59      *
  60      * @param thing The thing of this handler
  61      * @param stateDescProvider A channel state provider
  62      * @param transformationServiceProvider The transformation service provider
  63      * @param subscribeTimeout The subscribe timeout
  64      */
  65     public GenericMQTTThingHandler(Thing thing, MqttChannelStateDescriptionProvider stateDescProvider,
  66             TransformationServiceProvider transformationServiceProvider, int subscribeTimeout) {
  67         super(thing, subscribeTimeout);
  68         this.stateDescProvider = stateDescProvider;
  69         this.transformationServiceProvider = transformationServiceProvider;
  70     }
  71
  72     @Override
  73     public @Nullable ChannelState getChannelState(ChannelUID channelUID) {
  74         return channelStateByChannelUID.get(channelUID);
  75     }
  76
  77     /**
  78      * Subscribe on all channel static topics on all {@link ChannelState}s.
  79      * If subscribing on all channels worked, the thing is put ONLINE, else OFFLINE.
  80      *
  81      * @param connection A started broker connection
  82      */
  83     @Override
  84     protected CompletableFuture<@Nullable Void> start(MqttBrokerConnection connection) {
  85         // availability topics are also started asynchronously, so no problem here
  86         clearAllAvailabilityTopics();
  87         initializeAvailabilityTopicsFromConfig();
  88         return channelStateByChannelUID.values().stream().map(c -> c.start(connection, scheduler, 0))
  89                 .collect(FutureCollector.allOf()).thenRun(this::calculateThingStatus);
  90     }
  91
  92     @Override
  93     protected void stop() {
  94         channelStateByChannelUID.values().forEach(c -> c.getCache().resetState());
  95         super.stop();
  96     }
  97
  98     @Override
  99     public void dispose() {
 100         // Remove all state descriptions of this handler
 101         channelStateByChannelUID.forEach((uid, state) -> stateDescProvider.remove(uid));
 102         super.dispose();
 103         // there is a design flaw, we can't clean up our stuff because it is needed by the super-class on disposal for
 104         // unsubscribing
 105         channelStateByChannelUID.clear();
 106     }
 107
 108     @Override
 109     public CompletableFuture<Void> unsubscribeAll() {
 110         return CompletableFuture.allOf(
 111                 channelStateByChannelUID.values().stream().map(ChannelState::stop).toArray(CompletableFuture[]::new));
 112     }
 113
 114     /**
 115      * For every Thing channel there exists a corresponding {@link ChannelState}. It consists of the MQTT state
 116      * and MQTT command topic, the ChannelUID and a value state.
 117      *
 118      * @param channelConfig The channel configuration that contains MQTT state and command topic and multiple other
 119      *            configurations.
 120      * @param channelUID The channel UID
 121      * @param valueState The channel value state
 122      * @return
 123      */
 124     protected ChannelState createChannelState(ChannelConfig channelConfig, ChannelUID channelUID, Value valueState) {
 125         ChannelState state = new ChannelState(channelConfig, channelUID, valueState, this);
 126
 127         // Incoming value transformations
 128         state.addTransformation(channelConfig.transformationPattern, transformationServiceProvider);
 129         // Outgoing value transformations
 130         state.addTransformationOut(channelConfig.transformationPatternOut, transformationServiceProvider);
 131
 132         return state;
 133     }
 134
 135     @Override
 136     public void initialize() {
 137         initializeAvailabilityTopicsFromConfig();
 138
 139         List<ChannelUID> configErrors = new ArrayList<>();
 140         for (Channel channel : thing.getChannels()) {
 141             final ChannelTypeUID channelTypeUID = channel.getChannelTypeUID();
 142             if (channelTypeUID == null) {
 143                 logger.warn("Channel {} has no type", channel.getLabel());
 144                 continue;
 145             }
 146             final ChannelConfig channelConfig = channel.getConfiguration().as(ChannelConfig.class);
 147             try {
 148                 Value value = ValueFactory.createValueState(channelConfig, channelTypeUID.getId());
 149                 ChannelState channelState = createChannelState(channelConfig, channel.getUID(), value);
 150                 channelStateByChannelUID.put(channel.getUID(), channelState);
 151                 StateDescription description = value.createStateDescription(channelConfig.commandTopic.isBlank())
 152                         .build().toStateDescription();
 153                 if (description != null) {
 154                     stateDescProvider.setDescription(channel.getUID(), description);
 155                 }
 156             } catch (IllegalArgumentException e) {
 157                 logger.warn("Configuration error for channel '{}'", channel.getUID(), e);
 158                 configErrors.add(channel.getUID());
 159             }
 160         }
 161
 162         // If some channels could not start up, put the entire thing offline and display the channels
 163         // in question to the user.
 164         if (!configErrors.isEmpty()) {
 165             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, "Remove and recreate: "
 166                     + configErrors.stream().map(ChannelUID::getAsString).collect(Collectors.joining(",")));
 167             return;
 168         }
 169         super.initialize();
 170     }
 171
 172     @Override
 173     protected void updateThingStatus(boolean messageReceived, Optional<Boolean> availibilityTopicsSeen) {
 174         if (availibilityTopicsSeen.orElse(true)) {
 175             updateStatus(ThingStatus.ONLINE, ThingStatusDetail.NONE);
 176         } else {
 177             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.NONE);
 178         }
 179     }
 180
 181     private void initializeAvailabilityTopicsFromConfig() {
 182         GenericThingConfiguration config = getConfigAs(GenericThingConfiguration.class);
 183
 184         String availabilityTopic = config.availabilityTopic;
 185
 186         if (availabilityTopic != null) {
 187             addAvailabilityTopic(availabilityTopic, config.payloadAvailable, config.payloadNotAvailable,
 188                     config.transformationPattern, transformationServiceProvider);
 189         } else {
 190             clearAllAvailabilityTopics();
 191         }
 192     }
 193 }