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   1 /**
   2  * Copyright (c) 2010-2020 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.wlanthermo.internal;
  14
  15 import java.net.URISyntaxException;
  16 import java.util.Objects;
  17 import java.util.concurrent.*;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.eclipse.jetty.client.HttpClient;
  22 import org.openhab.binding.wlanthermo.internal.api.mini.builtin.App;
  23 import org.openhab.binding.wlanthermo.internal.api.mini.builtin.WlanThermoMiniCommandHandler;
  24 import org.openhab.core.common.ThreadPoolManager;
  25 import org.openhab.core.thing.*;
  26 import org.openhab.core.thing.binding.BaseThingHandler;
  27 import org.openhab.core.types.Command;
  28 import org.openhab.core.types.RefreshType;
  29 import org.openhab.core.types.State;
  30 import org.openhab.core.types.UnDefType;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 import com.google.gson.Gson;
  35
  36 /**
  37  * The {@link WlanThermoMiniHandler} is responsible for handling commands, which are
  38  * sent to one of the channels.
  39  *
  40  * @author Christian Schlipp - Initial contribution
  41  */
  42 @NonNullByDefault
  43 public class WlanThermoMiniHandler extends BaseThingHandler {
  44
  45     private final Logger logger = LoggerFactory.getLogger(WlanThermoMiniHandler.class);
  46     private final WlanThermoMiniCommandHandler wlanThermoMiniCommandHandler = new WlanThermoMiniCommandHandler();
  47
  48     private WlanThermoMiniConfiguration config = new WlanThermoMiniConfiguration();
  49     private final HttpClient httpClient;
  50     private @Nullable ScheduledFuture<?> pollingScheduler;
  51     private final ScheduledExecutorService scheduler = ThreadPoolManager
  52             .getScheduledPool(WlanThermoBindingConstants.WLANTHERMO_THREAD_POOL);
  53     private final Gson gson = new Gson();
  54     private App app = new App();
  55
  56     public WlanThermoMiniHandler(Thing thing, HttpClient httpClient) {
  57         super(thing);
  58         this.httpClient = httpClient;
  59     }
  60
  61     @Override
  62     public void initialize() {
  63         logger.debug("Start initializing WlanThermo Mini!");
  64         config = getConfigAs(WlanThermoMiniConfiguration.class);
  65
  66         updateStatus(ThingStatus.UNKNOWN);
  67         scheduler.schedule(this::checkConnection, config.getPollingInterval(), TimeUnit.SECONDS);
  68
  69         logger.debug("Finished initializing WlanThermo Mini!");
  70     }
  71
  72     private void checkConnection() {
  73         try {
  74             if (httpClient.GET(config.getUri("/app.php")).getStatus() == 200) {
  75                 updateStatus(ThingStatus.ONLINE);
  76                 ScheduledFuture<?> oldScheduler = pollingScheduler;
  77                 if (oldScheduler != null) {
  78                     oldScheduler.cancel(false);
  79                 }
  80                 pollingScheduler = scheduler.scheduleWithFixedDelay(this::update, 0, config.getPollingInterval(),
  81                         TimeUnit.SECONDS);
  82             } else {
  83                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
  84                         "WlanThermo not found under given address.");
  85             }
  86         } catch (URISyntaxException | InterruptedException | ExecutionException | TimeoutException e) {
  87             logger.debug("Failed to connect.", e);
  88             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
  89                     "Could not connect to WlanThermo at " + config.getIpAddress());
  90             ScheduledFuture<?> oldScheduler = pollingScheduler;
  91             if (oldScheduler != null) {
  92                 oldScheduler.cancel(false);
  93             }
  94             pollingScheduler = scheduler.schedule(this::checkConnection, config.getPollingInterval(), TimeUnit.SECONDS);
  95         }
  96     }
  97
  98     @Override
  99     public void handleCommand(ChannelUID channelUID, Command command) {
 100         if (command instanceof RefreshType) {
 101             State s = wlanThermoMiniCommandHandler.getState(channelUID, app);
 102             if (s != null)
 103                 updateState(channelUID, s);
 104         }
 105         // Mini is read only!
 106     }
 107
 108     private void update() {
 109         try {
 110             // Update objects with data from device
 111             String json = httpClient.GET(config.getUri("/app.php")).getContentAsString();
 112             app = Objects.requireNonNull(gson.fromJson(json, App.class));
 113             logger.debug("Received at /app.php: {}", json);
 114
 115             // Update channels
 116             for (Channel channel : thing.getChannels()) {
 117                 State state = wlanThermoMiniCommandHandler.getState(channel.getUID(), app);
 118                 if (state != null) {
 119                     updateState(channel.getUID(), state);
 120                 } else {
 121                     String trigger = wlanThermoMiniCommandHandler.getTrigger(channel.getUID(), app);
 122                     if (trigger != null) {
 123                         triggerChannel(channel.getUID(), trigger);
 124                     }
 125                 }
 126
 127             }
 128
 129         } catch (URISyntaxException | InterruptedException | ExecutionException | TimeoutException e) {
 130             logger.debug("Update failed, checking connection", e);
 131             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "Update failed, reconnecting...");
 132             ScheduledFuture<?> oldScheduler = pollingScheduler;
 133             if (oldScheduler != null) {
 134                 oldScheduler.cancel(false);
 135             }
 136             for (Channel channel : thing.getChannels()) {
 137                 updateState(channel.getUID(), UnDefType.UNDEF);
 138             }
 139             checkConnection();
 140         }
 141     }
 142
 143     @Override
 144     public void dispose() {
 145         ScheduledFuture<?> oldScheduler = pollingScheduler;
 146         if (oldScheduler != null) {
 147             boolean stopped = oldScheduler.cancel(true);
 148             logger.debug("Stopped polling: {}", stopped);
 149         }
 150         pollingScheduler = null;
 151     }
 152 }