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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.homeassistant.internal.discovery;
  14
  15 import java.nio.charset.StandardCharsets;
  16 import java.util.ArrayList;
  17 import java.util.Collection;
  18 import java.util.Collections;
  19 import java.util.Comparator;
  20 import java.util.HashMap;
  21 import java.util.List;
  22 import java.util.Map;
  23 import java.util.Objects;
  24 import java.util.Set;
  25 import java.util.TreeMap;
  26 import java.util.concurrent.ConcurrentHashMap;
  27 import java.util.concurrent.ScheduledFuture;
  28 import java.util.concurrent.TimeUnit;
  29 import java.util.function.Function;
  30 import java.util.stream.Collector;
  31 import java.util.stream.Collectors;
  32 import java.util.stream.Stream;
  33
  34 import org.eclipse.jdt.annotation.NonNullByDefault;
  35 import org.eclipse.jdt.annotation.Nullable;
  36 import org.openhab.binding.mqtt.discovery.AbstractMQTTDiscovery;
  37 import org.openhab.binding.mqtt.discovery.MQTTTopicDiscoveryService;
  38 import org.openhab.binding.mqtt.generic.MqttChannelTypeProvider;
  39 import org.openhab.binding.mqtt.homeassistant.generic.internal.MqttBindingConstants;
  40 import org.openhab.binding.mqtt.homeassistant.internal.HaID;
  41 import org.openhab.binding.mqtt.homeassistant.internal.HandlerConfiguration;
  42 import org.openhab.binding.mqtt.homeassistant.internal.config.ChannelConfigurationTypeAdapterFactory;
  43 import org.openhab.binding.mqtt.homeassistant.internal.config.dto.AbstractChannelConfiguration;
  44 import org.openhab.binding.mqtt.homeassistant.internal.exception.ConfigurationException;
  45 import org.openhab.core.config.discovery.DiscoveryResult;
  46 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  47 import org.openhab.core.config.discovery.DiscoveryService;
  48 import org.openhab.core.io.transport.mqtt.MqttBrokerConnection;
  49 import org.openhab.core.thing.ThingTypeUID;
  50 import org.openhab.core.thing.ThingUID;
  51 import org.openhab.core.thing.type.ThingType;
  52 import org.osgi.service.component.annotations.Component;
  53 import org.osgi.service.component.annotations.Reference;
  54 import org.slf4j.Logger;
  55 import org.slf4j.LoggerFactory;
  56
  57 import com.google.gson.Gson;
  58 import com.google.gson.GsonBuilder;
  59
  60 /**
  61  * The {@link HomeAssistantDiscovery} is responsible for discovering device nodes that follow the
  62  * Home Assistant MQTT discovery convention (https://www.home-assistant.io/docs/mqtt/discovery/).
  63  *
  64  * @author David Graeff - Initial contribution
  65  */
  66 @Component(service = DiscoveryService.class, configurationPid = "discovery.mqttha")
  67 @NonNullByDefault
  68 public class HomeAssistantDiscovery extends AbstractMQTTDiscovery {
  69     @SuppressWarnings("unused")
  70     private final Logger logger = LoggerFactory.getLogger(HomeAssistantDiscovery.class);
  71     protected final Map<String, Set<HaID>> componentsPerThingID = new TreeMap<>();
  72     protected final Map<String, ThingUID> thingIDPerTopic = new TreeMap<>();
  73     protected final Map<String, DiscoveryResult> results = new ConcurrentHashMap<>();
  74
  75     private @Nullable ScheduledFuture<?> future;
  76     private final Gson gson;
  77
  78     public static final Map<String, String> HA_COMP_TO_NAME = new TreeMap<>();
  79     {
  80         HA_COMP_TO_NAME.put("alarm_control_panel", "Alarm Control Panel");
  81         HA_COMP_TO_NAME.put("binary_sensor", "Sensor");
  82         HA_COMP_TO_NAME.put("camera", "Camera");
  83         HA_COMP_TO_NAME.put("cover", "Blind");
  84         HA_COMP_TO_NAME.put("fan", "Fan");
  85         HA_COMP_TO_NAME.put("climate", "Climate Control");
  86         HA_COMP_TO_NAME.put("light", "Light");
  87         HA_COMP_TO_NAME.put("lock", "Lock");
  88         HA_COMP_TO_NAME.put("sensor", "Sensor");
  89         HA_COMP_TO_NAME.put("switch", "Switch");
  90     }
  91
  92     static final String BASE_TOPIC = "homeassistant";
  93
  94     @NonNullByDefault({})
  95     protected MqttChannelTypeProvider typeProvider;
  96
  97     @NonNullByDefault({})
  98     protected MQTTTopicDiscoveryService mqttTopicDiscovery;
  99
 100     public HomeAssistantDiscovery() {
 101         super(null, 3, true, BASE_TOPIC + "/#");
 102         this.gson = new GsonBuilder().registerTypeAdapterFactory(new ChannelConfigurationTypeAdapterFactory()).create();
 103     }
 104
 105     @Reference
 106     public void setMQTTTopicDiscoveryService(MQTTTopicDiscoveryService service) {
 107         mqttTopicDiscovery = service;
 108     }
 109
 110     public void unsetMQTTTopicDiscoveryService(@Nullable MQTTTopicDiscoveryService service) {
 111         mqttTopicDiscovery.unsubscribe(this);
 112         this.mqttTopicDiscovery = null;
 113     }
 114
 115     @Override
 116     protected MQTTTopicDiscoveryService getDiscoveryService() {
 117         return mqttTopicDiscovery;
 118     }
 119
 120     @Reference
 121     protected void setTypeProvider(MqttChannelTypeProvider provider) {
 122         this.typeProvider = provider;
 123     }
 124
 125     protected void unsetTypeProvider(MqttChannelTypeProvider provider) {
 126         this.typeProvider = null;
 127     }
 128
 129     @Override
 130     public Set<ThingTypeUID> getSupportedThingTypes() {
 131         return typeProvider.getThingTypeUIDs();
 132     }
 133
 134     /**
 135      * Summarize components such as {Switch, Switch, Sensor} into string "Sensor, 2x Switch"
 136      *
 137      * @param componentNames stream of component names
 138      * @return summary string of component names and their counts
 139      */
 140     static String getComponentNamesSummary(Stream<String> componentNames) {
 141         StringBuilder summary = new StringBuilder();
 142         Collector<String, ?, Long> countingCollector = Collectors.counting();
 143         Map<String, Long> componentCounts = componentNames
 144                 .collect(Collectors.groupingBy(Function.identity(), countingCollector));
 145         componentCounts.entrySet().stream().sorted(Map.Entry.comparingByKey()).forEach(entry -> {
 146             String componentName = entry.getKey();
 147             long count = entry.getValue();
 148             if (summary.length() > 0) {
 149                 // not the first entry, so let's add the separating comma
 150                 summary.append(", ");
 151             }
 152             if (count > 1) {
 153                 summary.append(count);
 154                 summary.append("x ");
 155             }
 156             summary.append(componentName);
 157         });
 158         return summary.toString();
 159     }
 160
 161     @Override
 162     public void receivedMessage(ThingUID connectionBridge, MqttBrokerConnection connection, String topic,
 163             byte[] payload) {
 164         resetTimeout();
 165
 166         // For HomeAssistant we need to subscribe to a wildcard topic, because topics can either be:
 167         // homeassistant/<component>/<node_id>/<object_id>/config OR
 168         // homeassistant/<component>/<object_id>/config.
 169         // We check for the last part to filter all non-config topics out.
 170         if (!topic.endsWith("/config")) {
 171             return;
 172         }
 173
 174         // Reset the found-component timer.
 175         // We will collect components for the thing label description for another 2 seconds.
 176         final ScheduledFuture<?> future = this.future;
 177         if (future != null) {
 178             future.cancel(false);
 179         }
 180         this.future = scheduler.schedule(this::publishResults, 2, TimeUnit.SECONDS);
 181
 182         // We will of course find multiple of the same unique Thing IDs, for each different component another one.
 183         // Therefore the components are assembled into a list and given to the DiscoveryResult label for the user to
 184         // easily recognize object capabilities.
 185         HaID haID = new HaID(topic);
 186
 187         try {
 188             AbstractChannelConfiguration config = AbstractChannelConfiguration
 189                     .fromString(new String(payload, StandardCharsets.UTF_8), gson);
 190
 191             final String thingID = config.getThingId(haID.objectID);
 192
 193             final ThingTypeUID typeID = new ThingTypeUID(MqttBindingConstants.BINDING_ID,
 194                     MqttBindingConstants.HOMEASSISTANT_MQTT_THING.getId() + "_" + thingID);
 195
 196             final ThingUID thingUID = new ThingUID(typeID, connectionBridge, thingID);
 197
 198             thingIDPerTopic.put(topic, thingUID);
 199
 200             // We need to keep track of already found component topics for a specific thing
 201             final List<HaID> components;
 202             {
 203                 Set<HaID> componentsUnordered = componentsPerThingID.computeIfAbsent(thingID,
 204                         key -> ConcurrentHashMap.newKeySet());
 205
 206                 // Invariant. For compiler, computeIfAbsent above returns always
 207                 // non-null
 208                 Objects.requireNonNull(componentsUnordered);
 209                 componentsUnordered.add(haID);
 210
 211                 components = componentsUnordered.stream().collect(Collectors.toList());
 212                 // We sort the components for consistent jsondb serialization order of 'topics' thing property
 213                 // Sorting key is HaID::toString, i.e. using the full topic string
 214                 components.sort(Comparator.comparing(HaID::toString));
 215             }
 216
 217             final String componentNames = getComponentNamesSummary(
 218                     components.stream().map(id -> id.component).map(c -> HA_COMP_TO_NAME.getOrDefault(c, c)));
 219
 220             final List<String> topics = components.stream().map(HaID::toShortTopic).collect(Collectors.toList());
 221
 222             Map<String, Object> properties = new HashMap<>();
 223             HandlerConfiguration handlerConfig = new HandlerConfiguration(haID.baseTopic, topics);
 224             properties = handlerConfig.appendToProperties(properties);
 225             properties = config.appendToProperties(properties);
 226             properties.put("deviceId", thingID);
 227
 228             // Because we need the new properties map with the updated "components" list
 229             results.put(thingUID.getAsString(),
 230                     DiscoveryResultBuilder.create(thingUID).withProperties(properties)
 231                             .withRepresentationProperty("deviceId").withBridge(connectionBridge)
 232                             .withLabel(config.getThingName() + " (" + componentNames + ")").build());
 233         } catch (ConfigurationException e) {
 234             logger.warn("HomeAssistant discover error: invalid configuration of thing {} component {}: {}",
 235                     haID.objectID, haID.component, e.getMessage());
 236         } catch (Exception e) {
 237             logger.warn("HomeAssistant discover error: {}", e.getMessage());
 238         }
 239     }
 240
 241     protected void publishResults() {
 242         Collection<DiscoveryResult> localResults;
 243
 244         localResults = new ArrayList<>(results.values());
 245         results.clear();
 246         componentsPerThingID.clear();
 247         for (DiscoveryResult result : localResults) {
 248             final ThingTypeUID typeID = result.getThingTypeUID();
 249             ThingType type = typeProvider.derive(typeID, MqttBindingConstants.HOMEASSISTANT_MQTT_THING).build();
 250             typeProvider.setThingTypeIfAbsent(typeID, type);
 251
 252             thingDiscovered(result);
 253         }
 254     }
 255
 256     @Override
 257     public void topicVanished(ThingUID connectionBridge, MqttBrokerConnection connection, String topic) {
 258         if (!topic.endsWith("/config")) {
 259             return;
 260         }
 261         if (thingIDPerTopic.containsKey(topic)) {
 262             ThingUID thingUID = thingIDPerTopic.remove(topic);
 263             final String thingID = thingUID.getId();
 264
 265             HaID haID = new HaID(topic);
 266
 267             Set<HaID> components = componentsPerThingID.getOrDefault(thingID, Collections.emptySet());
 268             components.remove(haID);
 269             if (components.isEmpty()) {
 270                 thingRemoved(thingUID);
 271             }
 272         }
 273     }
 274 }