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   1 /**
   2  * Copyright (c) 2010-2021 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.HashMap;
  20 import java.util.List;
  21 import java.util.Map;
  22 import java.util.Set;
  23 import java.util.TreeMap;
  24 import java.util.concurrent.ConcurrentHashMap;
  25 import java.util.concurrent.ScheduledFuture;
  26 import java.util.concurrent.TimeUnit;
  27 import java.util.stream.Collectors;
  28
  29 import org.eclipse.jdt.annotation.NonNullByDefault;
  30 import org.eclipse.jdt.annotation.Nullable;
  31 import org.openhab.binding.mqtt.discovery.AbstractMQTTDiscovery;
  32 import org.openhab.binding.mqtt.discovery.MQTTTopicDiscoveryService;
  33 import org.openhab.binding.mqtt.generic.MqttChannelTypeProvider;
  34 import org.openhab.binding.mqtt.homeassistant.generic.internal.MqttBindingConstants;
  35 import org.openhab.binding.mqtt.homeassistant.internal.HaID;
  36 import org.openhab.binding.mqtt.homeassistant.internal.HandlerConfiguration;
  37 import org.openhab.binding.mqtt.homeassistant.internal.config.ChannelConfigurationTypeAdapterFactory;
  38 import org.openhab.binding.mqtt.homeassistant.internal.config.dto.AbstractChannelConfiguration;
  39 import org.openhab.binding.mqtt.homeassistant.internal.exception.ConfigurationException;
  40 import org.openhab.core.config.discovery.DiscoveryResult;
  41 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  42 import org.openhab.core.config.discovery.DiscoveryService;
  43 import org.openhab.core.io.transport.mqtt.MqttBrokerConnection;
  44 import org.openhab.core.thing.ThingTypeUID;
  45 import org.openhab.core.thing.ThingUID;
  46 import org.openhab.core.thing.type.ThingType;
  47 import org.osgi.service.component.annotations.Component;
  48 import org.osgi.service.component.annotations.Reference;
  49 import org.slf4j.Logger;
  50 import org.slf4j.LoggerFactory;
  51
  52 import com.google.gson.Gson;
  53 import com.google.gson.GsonBuilder;
  54
  55 /**
  56  * The {@link HomeAssistantDiscovery} is responsible for discovering device nodes that follow the
  57  * Home Assistant MQTT discovery convention (https://www.home-assistant.io/docs/mqtt/discovery/).
  58  *
  59  * @author David Graeff - Initial contribution
  60  */
  61 @Component(service = DiscoveryService.class, configurationPid = "discovery.mqttha")
  62 @NonNullByDefault
  63 public class HomeAssistantDiscovery extends AbstractMQTTDiscovery {
  64     @SuppressWarnings("unused")
  65     private final Logger logger = LoggerFactory.getLogger(HomeAssistantDiscovery.class);
  66     protected final Map<String, Set<HaID>> componentsPerThingID = new TreeMap<>();
  67     protected final Map<String, ThingUID> thingIDPerTopic = new TreeMap<>();
  68     protected final Map<String, DiscoveryResult> results = new ConcurrentHashMap<>();
  69
  70     private @Nullable ScheduledFuture<?> future;
  71     private final Gson gson;
  72
  73     public static final Map<String, String> HA_COMP_TO_NAME = new TreeMap<>();
  74     {
  75         HA_COMP_TO_NAME.put("alarm_control_panel", "Alarm Control Panel");
  76         HA_COMP_TO_NAME.put("binary_sensor", "Sensor");
  77         HA_COMP_TO_NAME.put("camera", "Camera");
  78         HA_COMP_TO_NAME.put("cover", "Blind");
  79         HA_COMP_TO_NAME.put("fan", "Fan");
  80         HA_COMP_TO_NAME.put("climate", "Climate Control");
  81         HA_COMP_TO_NAME.put("light", "Light");
  82         HA_COMP_TO_NAME.put("lock", "Lock");
  83         HA_COMP_TO_NAME.put("sensor", "Sensor");
  84         HA_COMP_TO_NAME.put("switch", "Switch");
  85     }
  86
  87     static final String BASE_TOPIC = "homeassistant";
  88
  89     @NonNullByDefault({})
  90     protected MqttChannelTypeProvider typeProvider;
  91
  92     @NonNullByDefault({})
  93     protected MQTTTopicDiscoveryService mqttTopicDiscovery;
  94
  95     public HomeAssistantDiscovery() {
  96         super(null, 3, true, BASE_TOPIC + "/#");
  97         this.gson = new GsonBuilder().registerTypeAdapterFactory(new ChannelConfigurationTypeAdapterFactory()).create();
  98     }
  99
 100     @Reference
 101     public void setMQTTTopicDiscoveryService(MQTTTopicDiscoveryService service) {
 102         mqttTopicDiscovery = service;
 103     }
 104
 105     public void unsetMQTTTopicDiscoveryService(@Nullable MQTTTopicDiscoveryService service) {
 106         mqttTopicDiscovery.unsubscribe(this);
 107         this.mqttTopicDiscovery = null;
 108     }
 109
 110     @Override
 111     protected MQTTTopicDiscoveryService getDiscoveryService() {
 112         return mqttTopicDiscovery;
 113     }
 114
 115     @Reference
 116     protected void setTypeProvider(MqttChannelTypeProvider provider) {
 117         this.typeProvider = provider;
 118     }
 119
 120     protected void unsetTypeProvider(MqttChannelTypeProvider provider) {
 121         this.typeProvider = null;
 122     }
 123
 124     @Override
 125     public Set<ThingTypeUID> getSupportedThingTypes() {
 126         return typeProvider.getThingTypeUIDs();
 127     }
 128
 129     @Override
 130     public void receivedMessage(ThingUID connectionBridge, MqttBrokerConnection connection, String topic,
 131             byte[] payload) {
 132         resetTimeout();
 133
 134         // For HomeAssistant we need to subscribe to a wildcard topic, because topics can either be:
 135         // homeassistant/<component>/<node_id>/<object_id>/config OR
 136         // homeassistant/<component>/<object_id>/config.
 137         // We check for the last part to filter all non-config topics out.
 138         if (!topic.endsWith("/config")) {
 139             return;
 140         }
 141
 142         // Reset the found-component timer.
 143         // We will collect components for the thing label description for another 2 seconds.
 144         final ScheduledFuture<?> future = this.future;
 145         if (future != null) {
 146             future.cancel(false);
 147         }
 148         this.future = scheduler.schedule(this::publishResults, 2, TimeUnit.SECONDS);
 149
 150         // We will of course find multiple of the same unique Thing IDs, for each different component another one.
 151         // Therefore the components are assembled into a list and given to the DiscoveryResult label for the user to
 152         // easily recognize object capabilities.
 153         HaID haID = new HaID(topic);
 154
 155         try {
 156             AbstractChannelConfiguration config = AbstractChannelConfiguration
 157                     .fromString(new String(payload, StandardCharsets.UTF_8), gson);
 158
 159             final String thingID = config.getThingId(haID.objectID);
 160
 161             final ThingTypeUID typeID = new ThingTypeUID(MqttBindingConstants.BINDING_ID,
 162                     MqttBindingConstants.HOMEASSISTANT_MQTT_THING.getId() + "_" + thingID);
 163
 164             final ThingUID thingUID = new ThingUID(typeID, connectionBridge, thingID);
 165
 166             thingIDPerTopic.put(topic, thingUID);
 167
 168             // We need to keep track of already found component topics for a specific thing
 169             Set<HaID> components = componentsPerThingID.computeIfAbsent(thingID, key -> ConcurrentHashMap.newKeySet());
 170             components.add(haID);
 171
 172             final String componentNames = components.stream().map(id -> id.component)
 173                     .map(c -> HA_COMP_TO_NAME.getOrDefault(c, c)).collect(Collectors.joining(", "));
 174
 175             final List<String> topics = components.stream().map(HaID::toShortTopic).collect(Collectors.toList());
 176
 177             Map<String, Object> properties = new HashMap<>();
 178             HandlerConfiguration handlerConfig = new HandlerConfiguration(haID.baseTopic, topics);
 179             properties = handlerConfig.appendToProperties(properties);
 180             properties = config.appendToProperties(properties);
 181             properties.put("deviceId", thingID);
 182
 183             // Because we need the new properties map with the updated "components" list
 184             results.put(thingUID.getAsString(),
 185                     DiscoveryResultBuilder.create(thingUID).withProperties(properties)
 186                             .withRepresentationProperty("deviceId").withBridge(connectionBridge)
 187                             .withLabel(config.getThingName() + " (" + componentNames + ")").build());
 188         } catch (ConfigurationException e) {
 189             logger.warn("HomeAssistant discover error: invalid configuration of thing {} component {}: {}",
 190                     haID.objectID, haID.component, e.getMessage());
 191         } catch (Exception e) {
 192             logger.warn("HomeAssistant discover error: {}", e.getMessage());
 193         }
 194     }
 195
 196     protected void publishResults() {
 197         Collection<DiscoveryResult> localResults;
 198
 199         localResults = new ArrayList<>(results.values());
 200         results.clear();
 201         componentsPerThingID.clear();
 202         for (DiscoveryResult result : localResults) {
 203             final ThingTypeUID typeID = result.getThingTypeUID();
 204             ThingType type = typeProvider.derive(typeID, MqttBindingConstants.HOMEASSISTANT_MQTT_THING).build();
 205             typeProvider.setThingTypeIfAbsent(typeID, type);
 206
 207             thingDiscovered(result);
 208         }
 209     }
 210
 211     @Override
 212     public void topicVanished(ThingUID connectionBridge, MqttBrokerConnection connection, String topic) {
 213         if (!topic.endsWith("/config")) {
 214             return;
 215         }
 216         if (thingIDPerTopic.containsKey(topic)) {
 217             ThingUID thingUID = thingIDPerTopic.remove(topic);
 218             final String thingID = thingUID.getId();
 219
 220             HaID haID = new HaID(topic);
 221
 222             Set<HaID> components = componentsPerThingID.getOrDefault(thingID, Collections.emptySet());
 223             components.remove(haID);
 224             if (components.isEmpty()) {
 225                 thingRemoved(thingUID);
 226             }
 227         }
 228     }
 229 }