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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.synopanalyzer.internal.handler;
  14
  15 import static org.openhab.binding.synopanalyzer.internal.SynopAnalyzerBindingConstants.*;
  16
  17 import java.io.IOException;
  18 import java.time.ZoneOffset;
  19 import java.time.ZonedDateTime;
  20 import java.time.format.DateTimeFormatter;
  21 import java.util.ArrayList;
  22 import java.util.Arrays;
  23 import java.util.HashMap;
  24 import java.util.List;
  25 import java.util.Map;
  26 import java.util.Optional;
  27 import java.util.concurrent.ScheduledFuture;
  28 import java.util.concurrent.TimeUnit;
  29
  30 import javax.measure.quantity.Speed;
  31 import javax.ws.rs.HttpMethod;
  32
  33 import org.eclipse.jdt.annotation.NonNullByDefault;
  34 import org.eclipse.jdt.annotation.Nullable;
  35 import org.openhab.binding.synopanalyser.internal.synop.Overcast;
  36 import org.openhab.binding.synopanalyser.internal.synop.StationDB;
  37 import org.openhab.binding.synopanalyser.internal.synop.Synop;
  38 import org.openhab.binding.synopanalyser.internal.synop.SynopLand;
  39 import org.openhab.binding.synopanalyser.internal.synop.SynopMobile;
  40 import org.openhab.binding.synopanalyser.internal.synop.SynopShip;
  41 import org.openhab.binding.synopanalyser.internal.synop.WindDirections;
  42 import org.openhab.binding.synopanalyzer.internal.config.SynopAnalyzerConfiguration;
  43 import org.openhab.core.i18n.LocationProvider;
  44 import org.openhab.core.io.net.http.HttpUtil;
  45 import org.openhab.core.library.types.DateTimeType;
  46 import org.openhab.core.library.types.DecimalType;
  47 import org.openhab.core.library.types.PointType;
  48 import org.openhab.core.library.types.QuantityType;
  49 import org.openhab.core.library.types.StringType;
  50 import org.openhab.core.library.unit.SIUnits;
  51 import org.openhab.core.thing.ChannelUID;
  52 import org.openhab.core.thing.Thing;
  53 import org.openhab.core.thing.ThingStatus;
  54 import org.openhab.core.thing.binding.BaseThingHandler;
  55 import org.openhab.core.types.Command;
  56 import org.openhab.core.types.RefreshType;
  57 import org.openhab.core.types.State;
  58 import org.openhab.core.types.UnDefType;
  59 import org.slf4j.Logger;
  60 import org.slf4j.LoggerFactory;
  61
  62 /**
  63  * The {@link SynopAnalyzerHandler} is responsible for handling commands, which are
  64  * sent to one of the channels.
  65  *
  66  * @author Gaël L'hopital - Initial contribution
  67  * @author Mark Herwege - Correction for timezone treatment
  68  */
  69 @NonNullByDefault
  70 public class SynopAnalyzerHandler extends BaseThingHandler {
  71     private static final String OGIMET_SYNOP_PATH = "http://www.ogimet.com/cgi-bin/getsynop?block=%s&begin=%s";
  72     private static final int REQUEST_TIMEOUT_MS = 5000;
  73     private static final DateTimeFormatter SYNOP_DATE_FORMAT = DateTimeFormatter.ofPattern("yyyyMMddHH00");
  74     private static final double KASTEN_POWER = 3.4;
  75     private static final double OCTA_MAX = 8.0;
  76
  77     private final Logger logger = LoggerFactory.getLogger(SynopAnalyzerHandler.class);
  78
  79     private @Nullable ScheduledFuture<?> executionJob;
  80     private @NonNullByDefault({}) String formattedStationId;
  81     private final LocationProvider locationProvider;
  82     private final @Nullable StationDB stationDB;
  83
  84     public SynopAnalyzerHandler(Thing thing, LocationProvider locationProvider, @Nullable StationDB stationDB) {
  85         super(thing);
  86         this.locationProvider = locationProvider;
  87         this.stationDB = stationDB;
  88     }
  89
  90     @Override
  91     public void initialize() {
  92         SynopAnalyzerConfiguration configuration = getConfigAs(SynopAnalyzerConfiguration.class);
  93         formattedStationId = String.format("%05d", configuration.stationId);
  94         logger.info("Scheduling Synop update thread to run every {} minute for Station '{}'",
  95                 configuration.refreshInterval, formattedStationId);
  96
  97         StationDB stations = stationDB;
  98         if (thing.getProperties().isEmpty() && stations != null) {
  99             discoverAttributes(stations, configuration.stationId);
 100         }
 101
 102         executionJob = scheduler.scheduleWithFixedDelay(this::updateSynopChannels, 0, configuration.refreshInterval,
 103                 TimeUnit.MINUTES);
 104     }
 105
 106     protected void discoverAttributes(StationDB stations, int stationId) {
 107         stations.stations.stream().filter(s -> stationId == s.idOmm).findFirst().ifPresent(s -> {
 108             Map<String, String> properties = new HashMap<>();
 109             properties.put("Usual name", s.usualName);
 110             properties.put("Location", s.getLocation());
 111
 112             PointType stationLocation = new PointType(s.getLocation());
 113             PointType serverLocation = locationProvider.getLocation();
 114             if (serverLocation != null) {
 115                 DecimalType distance = serverLocation.distanceFrom(stationLocation);
 116
 117                 properties.put("Distance", new QuantityType<>(distance, SIUnits.METRE).toString());
 118             }
 119             updateProperties(properties);
 120         });
 121     }
 122
 123     private Optional<Synop> getLastAvailableSynop() {
 124         logger.debug("Retrieving last Synop message");
 125
 126         String url = forgeURL();
 127         try {
 128             String answer = HttpUtil.executeUrl(HttpMethod.GET, url, REQUEST_TIMEOUT_MS);
 129             List<String> messages = Arrays.asList(answer.split("\n"));
 130             if (!messages.isEmpty()) {
 131                 String message = messages.get(messages.size() - 1);
 132                 logger.debug(message);
 133                 if (message.startsWith(formattedStationId)) {
 134                     logger.debug("Valid Synop message received");
 135
 136                     List<String> messageParts = Arrays.asList(message.split(","));
 137                     String synopMessage = messageParts.get(messageParts.size() - 1);
 138
 139                     return createSynopObject(synopMessage);
 140                 }
 141                 logger.warn("Message does not belong to station {} : {}", formattedStationId, message);
 142             }
 143             logger.warn("No valid Synop found for last 24h");
 144         } catch (IOException e) {
 145             logger.warn("Synop request timedout : {}", e.getMessage());
 146         }
 147         return Optional.empty();
 148     }
 149
 150     private void updateSynopChannels() {
 151         logger.debug("Updating device channels");
 152
 153         Optional<Synop> synop = getLastAvailableSynop();
 154         updateStatus(synop.isPresent() ? ThingStatus.ONLINE : ThingStatus.OFFLINE);
 155         synop.ifPresent(theSynop -> {
 156             getThing().getChannels().forEach(channel -> {
 157                 String channelId = channel.getUID().getId();
 158                 if (isLinked(channelId)) {
 159                     updateState(channelId, getChannelState(channelId, theSynop));
 160                 }
 161             });
 162         });
 163     }
 164
 165     private State getChannelState(String channelId, Synop synop) {
 166         switch (channelId) {
 167             case HORIZONTAL_VISIBILITY:
 168                 return new StringType(synop.getHorizontalVisibility().name());
 169             case OCTA:
 170                 return new DecimalType(Math.max(0, synop.getOcta()));
 171             case ATTENUATION_FACTOR:
 172                 double kc = Math.max(0, Math.min(synop.getOcta(), OCTA_MAX)) / OCTA_MAX;
 173                 kc = 1 - 0.75 * Math.pow(kc, KASTEN_POWER);
 174                 return new DecimalType(kc);
 175             case OVERCAST:
 176                 int octa = synop.getOcta();
 177                 Overcast overcast = Overcast.fromOcta(octa);
 178                 return overcast == Overcast.UNDEFINED ? UnDefType.NULL : new StringType(overcast.name());
 179             case PRESSURE:
 180                 return new QuantityType<>(synop.getPressure(), PRESSURE_UNIT);
 181             case TEMPERATURE:
 182                 return new QuantityType<>(synop.getTemperature(), TEMPERATURE_UNIT);
 183             case WIND_ANGLE:
 184                 return new QuantityType<>(synop.getWindDirection(), WIND_DIRECTION_UNIT);
 185             case WIND_DIRECTION:
 186                 return new StringType(WindDirections.getWindDirection(synop.getWindDirection()).name());
 187             case WIND_STRENGTH:
 188                 return getWindStrength(synop);
 189             case WIND_SPEED_BEAUFORT:
 190                 QuantityType<Speed> wsKpH = getWindStrength(synop).toUnit(SIUnits.KILOMETRE_PER_HOUR);
 191                 return (wsKpH != null) ? new DecimalType(Math.round(Math.pow(wsKpH.floatValue() / 3.01, 0.666666666)))
 192                         : UnDefType.NULL;
 193             case TIME_UTC:
 194                 ZonedDateTime now = ZonedDateTime.now(ZoneOffset.UTC);
 195                 int year = synop.getYear() == 0 ? now.getYear() : synop.getYear();
 196                 int month = synop.getMonth() == 0 ? now.getMonth().getValue() : synop.getMonth();
 197                 ZonedDateTime zdt = ZonedDateTime.of(year, month, synop.getDay(), synop.getHour(), 0, 0, 0,
 198                         ZoneOffset.UTC);
 199                 return new DateTimeType(zdt);
 200             default:
 201                 logger.error("Unsupported channel Id '{}'", channelId);
 202                 return UnDefType.UNDEF;
 203         }
 204     }
 205
 206     /**
 207      * Returns the wind strength depending upon the unit of the message.
 208      */
 209     private QuantityType<Speed> getWindStrength(Synop synop) {
 210         return new QuantityType<>(synop.getWindSpeed(), synop.getWindUnit());
 211     }
 212
 213     private Optional<Synop> createSynopObject(String synopMessage) {
 214         List<String> list = new ArrayList<>(Arrays.asList(synopMessage.split("\\s+")));
 215         if (synopMessage.startsWith(LAND_STATION_CODE)) {
 216             return Optional.of(new SynopLand(list));
 217         } else if (synopMessage.startsWith(SHIP_STATION_CODE)) {
 218             return Optional.of(new SynopShip(list));
 219         } else if (synopMessage.startsWith(MOBILE_LAND_STATION_CODE)) {
 220             return Optional.of(new SynopMobile(list));
 221         }
 222         return Optional.empty();
 223     }
 224
 225     private String forgeURL() {
 226         ZonedDateTime utc = ZonedDateTime.now(ZoneOffset.UTC).minusDays(1);
 227         String beginDate = SYNOP_DATE_FORMAT.format(utc);
 228         return String.format(OGIMET_SYNOP_PATH, formattedStationId, beginDate);
 229     }
 230
 231     @Override
 232     public void dispose() {
 233         ScheduledFuture<?> job = this.executionJob;
 234         if (job != null && !job.isCancelled()) {
 235             job.cancel(true);
 236         }
 237         executionJob = null;
 238     }
 239
 240     @Override
 241     public void handleCommand(ChannelUID channelUID, Command command) {
 242         if (command == RefreshType.REFRESH) {
 243             updateSynopChannels();
 244         }
 245     }
 246 }