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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.unifiedremote.internal;
  14
  15 import static org.openhab.binding.unifiedremote.internal.UnifiedRemoteBindingConstants.MOUSE_CHANNEL;
  16 import static org.openhab.binding.unifiedremote.internal.UnifiedRemoteBindingConstants.SEND_KEY_CHANNEL;
  17
  18 import java.net.ConnectException;
  19 import java.net.NoRouteToHostException;
  20 import java.util.concurrent.ExecutionException;
  21 import java.util.concurrent.ScheduledFuture;
  22 import java.util.concurrent.TimeUnit;
  23 import java.util.concurrent.TimeoutException;
  24
  25 import org.eclipse.jdt.annotation.NonNullByDefault;
  26 import org.eclipse.jdt.annotation.Nullable;
  27 import org.eclipse.jetty.client.HttpClient;
  28 import org.eclipse.jetty.client.api.ContentResponse;
  29 import org.openhab.core.thing.ChannelUID;
  30 import org.openhab.core.thing.Thing;
  31 import org.openhab.core.thing.ThingStatus;
  32 import org.openhab.core.thing.ThingStatusDetail;
  33 import org.openhab.core.thing.binding.BaseThingHandler;
  34 import org.openhab.core.types.Command;
  35
  36 /**
  37  * The {@link UnifiedRemoteHandler} is responsible for handling commands, which are
  38  * sent to one of the channels.
  39  *
  40  * @author Miguel Alvarez - Initial contribution
  41  */
  42 @NonNullByDefault
  43 public class UnifiedRemoteHandler extends BaseThingHandler {
  44
  45     private @Nullable UnifiedRemoteConnection connection;
  46     private @Nullable ScheduledFuture<?> connectionCheckerSchedule;
  47     private HttpClient httpClient;
  48
  49     public UnifiedRemoteHandler(Thing thing, HttpClient httpClient) {
  50         super(thing);
  51         this.httpClient = httpClient;
  52     }
  53
  54     @Override
  55     public void handleCommand(ChannelUID channelUID, Command command) {
  56         String channelId = channelUID.getId();
  57         if (!isLinked(channelId))
  58             return;
  59         String stringCommand = command.toFullString();
  60         UnifiedRemoteConnection urConnection = connection;
  61         try {
  62             if (urConnection != null) {
  63                 ContentResponse response;
  64                 switch (channelId) {
  65                     case MOUSE_CHANNEL:
  66                         response = urConnection.mouseMove(stringCommand);
  67                         break;
  68                     case SEND_KEY_CHANNEL:
  69                         response = urConnection.sendKey(stringCommand);
  70                         break;
  71                     default:
  72                         return;
  73                 }
  74                 if (isErrorResponse(response)) {
  75                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "Session expired");
  76                     urConnection.authenticate();
  77                     updateStatus(ThingStatus.ONLINE);
  78                 }
  79             } else {
  80                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "Connection not initialized");
  81             }
  82         } catch (InterruptedException | ExecutionException | TimeoutException e) {
  83             if (isThingOfflineException(e)) {
  84                 // we assume thing is offline
  85                 updateStatus(ThingStatus.OFFLINE);
  86             } else {
  87                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
  88                         "Unexpected exception: " + e.getMessage());
  89             }
  90         }
  91     }
  92
  93     @Override
  94     public void initialize() {
  95         updateStatus(ThingStatus.UNKNOWN);
  96         connection = getNewConnection();
  97         initConnectionChecker();
  98     }
  99
 100     private UnifiedRemoteConnection getNewConnection() {
 101         UnifiedRemoteConfiguration currentConfiguration = getConfigAs(UnifiedRemoteConfiguration.class);
 102         return new UnifiedRemoteConnection(this.httpClient, currentConfiguration.host);
 103     }
 104
 105     private void initConnectionChecker() {
 106         stopConnectionChecker();
 107         connectionCheckerSchedule = scheduler.scheduleWithFixedDelay(() -> {
 108             try {
 109                 UnifiedRemoteConnection urConnection = connection;
 110                 if (urConnection == null)
 111                     return;
 112                 ThingStatus status = thing.getStatus();
 113                 if ((status == ThingStatus.OFFLINE || status == ThingStatus.UNKNOWN) && connection != null) {
 114                     urConnection.authenticate();
 115                     updateStatus(ThingStatus.ONLINE);
 116                 } else if (status == ThingStatus.ONLINE) {
 117                     if (isErrorResponse(urConnection.keepAlive())) {
 118                         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "Keep alive failed");
 119                     }
 120                 }
 121             } catch (InterruptedException | ExecutionException | TimeoutException e) {
 122                 if (isThingOfflineException(e)) {
 123                     // we assume thing is offline
 124                     updateStatus(ThingStatus.OFFLINE);
 125                 } else {
 126                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 127                             "Unexpected exception: " + e.getMessage());
 128                 }
 129             }
 130         }, 0, 40, TimeUnit.SECONDS);
 131     }
 132
 133     private boolean isThingOfflineException(Exception e) {
 134         return e instanceof TimeoutException || e.getCause() instanceof ConnectException
 135                 || e.getCause() instanceof NoRouteToHostException;
 136     }
 137
 138     private void stopConnectionChecker() {
 139         var schedule = connectionCheckerSchedule;
 140         if (schedule != null) {
 141             schedule.cancel(true);
 142             connectionCheckerSchedule = null;
 143         }
 144     }
 145
 146     @Override
 147     public void dispose() {
 148         stopConnectionChecker();
 149         super.dispose();
 150     }
 151
 152     private boolean isErrorResponse(ContentResponse response) {
 153         return response.getStatus() != 200 || response.getContentAsString().contains("Not a valid connection");
 154     }
 155 }