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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.logreader.internal.handler;
  14
  15 import static org.openhab.binding.logreader.internal.LogReaderBindingConstants.*;
  16
  17 import java.time.ZonedDateTime;
  18 import java.util.regex.PatternSyntaxException;
  19
  20 import org.eclipse.jdt.annotation.NonNullByDefault;
  21 import org.eclipse.jdt.annotation.Nullable;
  22 import org.openhab.binding.logreader.internal.config.LogReaderConfiguration;
  23 import org.openhab.binding.logreader.internal.filereader.api.FileReaderListener;
  24 import org.openhab.binding.logreader.internal.filereader.api.LogFileReader;
  25 import org.openhab.binding.logreader.internal.searchengine.SearchEngine;
  26 import org.openhab.core.library.types.DateTimeType;
  27 import org.openhab.core.library.types.DecimalType;
  28 import org.openhab.core.library.types.StringType;
  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 import org.openhab.core.types.RefreshType;
  36 import org.openhab.core.types.State;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 /**
  41  * The {@link LogHandler} is responsible for handling commands, which are
  42  * sent to one of the channels.
  43  *
  44  * @author Miika Jukka - Initial contribution
  45  * @author Pauli Anttila - Rewrite
  46  */
  47 @NonNullByDefault
  48 public class LogHandler extends BaseThingHandler implements FileReaderListener {
  49     private final Logger logger = LoggerFactory.getLogger(LogHandler.class);
  50
  51     private final LogFileReader fileReader;
  52
  53     private @NonNullByDefault({}) LogReaderConfiguration configuration;
  54
  55     private @Nullable SearchEngine errorEngine;
  56     private @Nullable SearchEngine warningEngine;
  57     private @Nullable SearchEngine customEngine;
  58
  59     public LogHandler(Thing thing, LogFileReader fileReader) {
  60         super(thing);
  61         this.fileReader = fileReader;
  62     }
  63
  64     @Override
  65     public void handleCommand(ChannelUID channelUID, Command command) {
  66         switch (channelUID.getId()) {
  67             case CHANNEL_ERRORS:
  68                 updateChannel(channelUID, command, errorEngine);
  69                 break;
  70
  71             case CHANNEL_WARNINGS:
  72                 updateChannel(channelUID, command, warningEngine);
  73                 break;
  74
  75             case CHANNEL_CUSTOMEVENTS:
  76                 updateChannel(channelUID, command, customEngine);
  77                 break;
  78
  79             default:
  80                 logger.debug("Unsupported command '{}' received for channel '{}'", command, channelUID);
  81         }
  82     }
  83
  84     @Override
  85     public void initialize() {
  86         String logDir = System.getProperty("openhab.logdir");
  87         if (logDir == null) {
  88             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
  89                     "Cannot determine system log directory.");
  90             return;
  91         }
  92
  93         configuration = getConfigAs(LogReaderConfiguration.class);
  94         configuration.filePath = configuration.filePath.replaceFirst("\\$\\{OPENHAB_LOGDIR\\}", logDir);
  95
  96         logger.debug("Using configuration: {}", configuration);
  97
  98         clearCounters();
  99
 100         try {
 101             warningEngine = new SearchEngine(configuration.warningPatterns, configuration.warningBlacklistingPatterns);
 102             errorEngine = new SearchEngine(configuration.errorPatterns, configuration.errorBlacklistingPatterns);
 103             String customPatterns = configuration.customPatterns;
 104             customEngine = new SearchEngine(customPatterns != null ? customPatterns : "",
 105                     configuration.customBlacklistingPatterns);
 106         } catch (PatternSyntaxException e) {
 107             logger.debug("Illegal search pattern syntax '{}'. ", e.getMessage(), e);
 108             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.OFFLINE.CONFIGURATION_ERROR, e.getMessage());
 109             return;
 110         }
 111
 112         logger.debug("Start file reader");
 113
 114         try {
 115             fileReader.registerListener(this);
 116             fileReader.start(configuration.filePath, configuration.refreshRate);
 117             updateStatus(ThingStatus.ONLINE);
 118         } catch (Exception e) {
 119             logger.debug("Exception occurred during initalization: {}. ", e.getMessage(), e);
 120             shutdown();
 121             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.OFFLINE.CONFIGURATION_ERROR, e.getMessage());
 122         }
 123     }
 124
 125     @Override
 126     public void dispose() {
 127         logger.debug("Stopping thing");
 128         shutdown();
 129     }
 130
 131     private void updateChannel(ChannelUID channelUID, Command command, @Nullable SearchEngine matcher) {
 132         if (matcher != null) {
 133             if (command instanceof DecimalType) {
 134                 matcher.setMatchCount(((DecimalType) command).longValue());
 135             } else if (command instanceof RefreshType) {
 136                 updateState(channelUID.getId(), new DecimalType(matcher.getMatchCount()));
 137             } else {
 138                 logger.debug("Unsupported command '{}' received for channel '{}'", command, channelUID);
 139             }
 140         } else {
 141             logger.debug("Cannot update channel as SearchEngine is null.");
 142         }
 143     }
 144
 145     private void clearCounters() {
 146         if (errorEngine != null) {
 147             errorEngine.clearMatchCount();
 148         }
 149         if (warningEngine != null) {
 150             warningEngine.clearMatchCount();
 151         }
 152         if (customEngine != null) {
 153             customEngine.clearMatchCount();
 154         }
 155     }
 156
 157     private void updateChannelIfLinked(String channelID, State state) {
 158         if (isLinked(channelID)) {
 159             updateState(channelID, state);
 160         }
 161     }
 162
 163     private void shutdown() {
 164         logger.debug("Stop file reader");
 165         fileReader.unregisterListener(this);
 166         fileReader.stop();
 167     }
 168
 169     @Override
 170     public void fileNotFound() {
 171         final String msg = String.format("Log file '%s' does not exist", configuration.filePath);
 172         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.OFFLINE.COMMUNICATION_ERROR, msg);
 173     }
 174
 175     @Override
 176     public void fileRotated() {
 177         logger.debug("Log rotated");
 178         updateChannelIfLinked(CHANNEL_LOGROTATED, new DateTimeType(ZonedDateTime.now()));
 179     }
 180
 181     @Override
 182     public void handle(@Nullable String line) {
 183         if (line == null) {
 184             return;
 185         }
 186
 187         if (!(thing.getStatus() == ThingStatus.ONLINE)) {
 188             updateStatus(ThingStatus.ONLINE);
 189         }
 190
 191         if (errorEngine != null && errorEngine.isMatching(line)) {
 192             updateChannelIfLinked(CHANNEL_ERRORS, new DecimalType(errorEngine.getMatchCount()));
 193             updateChannelIfLinked(CHANNEL_LASTERROR, new StringType(line));
 194             triggerChannel(CHANNEL_NEWERROR, line);
 195         }
 196         if (warningEngine != null && warningEngine.isMatching(line)) {
 197             updateChannelIfLinked(CHANNEL_WARNINGS, new DecimalType(warningEngine.getMatchCount()));
 198             updateChannelIfLinked(CHANNEL_LASTWARNING, new StringType(line));
 199             triggerChannel(CHANNEL_NEWWARNING, line);
 200         }
 201         if (customEngine != null && customEngine.isMatching(line)) {
 202             updateChannelIfLinked(CHANNEL_CUSTOMEVENTS, new DecimalType(customEngine.getMatchCount()));
 203             updateChannelIfLinked(CHANNEL_LASTCUSTOMEVENT, new StringType(line));
 204             triggerChannel(CHANNEL_NEWCUSTOM, line);
 205         }
 206     }
 207
 208     @Override
 209     public void handle(@Nullable Exception ex) {
 210         final String msg = ex != null ? ex.getMessage() : "";
 211         logger.debug("Error while trying to read log file: {}. ", msg, ex);
 212         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.OFFLINE.COMMUNICATION_ERROR, msg);
 213     }
 214 }