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   1 /**
   2  * Copyright (c) 2010-2023 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.oceanic.internal.handler;
  14
  15 import java.io.IOException;
  16 import java.io.InputStream;
  17 import java.io.OutputStream;
  18 import java.net.Socket;
  19 import java.net.UnknownHostException;
  20 import java.util.Arrays;
  21 import java.util.concurrent.ScheduledFuture;
  22 import java.util.concurrent.TimeUnit;
  23
  24 import org.apache.commons.lang3.StringUtils;
  25 import org.eclipse.jdt.annotation.NonNullByDefault;
  26 import org.eclipse.jdt.annotation.Nullable;
  27 import org.openhab.binding.oceanic.internal.NetworkOceanicBindingConfiguration;
  28 import org.openhab.binding.oceanic.internal.Throttler;
  29 import org.openhab.core.thing.Thing;
  30 import org.openhab.core.thing.ThingStatus;
  31 import org.openhab.core.thing.ThingStatusDetail;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 /**
  36  * The {@link NetworkOceanicThingHandler} implements {@link OceanicThingHandler} for an Oceanic water softener that is
  37  * reached using a socat TCP proxy
  38  *
  39  * @author Karel Goderis - Initial contribution
  40  */
  41 @NonNullByDefault
  42 public class NetworkOceanicThingHandler extends OceanicThingHandler {
  43
  44     private static final int REQUEST_TIMEOUT = 3000;
  45     private static final int RECONNECT_INTERVAL = 15;
  46
  47     private final Logger logger = LoggerFactory.getLogger(NetworkOceanicThingHandler.class);
  48
  49     private @Nullable Socket socket;
  50     private @Nullable InputStream inputStream;
  51     private @Nullable OutputStream outputStream;
  52     protected @Nullable ScheduledFuture<?> reconnectJob;
  53
  54     public NetworkOceanicThingHandler(Thing thing) {
  55         super(thing);
  56     }
  57
  58     @Override
  59     public void initialize() {
  60         super.initialize();
  61
  62         NetworkOceanicBindingConfiguration config = getConfigAs(NetworkOceanicBindingConfiguration.class);
  63
  64         try {
  65             socket = new Socket(config.ipAddress, config.portNumber);
  66             socket.setSoTimeout(REQUEST_TIMEOUT);
  67             outputStream = socket.getOutputStream();
  68             inputStream = socket.getInputStream();
  69             updateStatus(ThingStatus.ONLINE);
  70         } catch (UnknownHostException e) {
  71             logger.error("An exception occurred while resolving host {}:{} : '{}'", config.ipAddress, config.portNumber,
  72                     e.getMessage());
  73             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
  74                     "Could not resolve host " + config.ipAddress + ": " + e.getMessage());
  75         } catch (IOException e) {
  76             logger.debug("An exception occurred while connecting to host {}:{} : '{}'", config.ipAddress,
  77                     config.portNumber, e.getMessage());
  78             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
  79                     "Could not connect to host " + config.ipAddress + ": " + e.getMessage());
  80             reconnectJob = scheduler.schedule(reconnectRunnable, RECONNECT_INTERVAL, TimeUnit.SECONDS);
  81         }
  82     }
  83
  84     @Override
  85     public void dispose() {
  86         NetworkOceanicBindingConfiguration config = getConfigAs(NetworkOceanicBindingConfiguration.class);
  87
  88         if (socket != null) {
  89             try {
  90                 socket.close();
  91             } catch (IOException e) {
  92                 logger.error("An exception occurred while disconnecting to host {}:{} : '{}'", config.ipAddress,
  93                         config.portNumber, e.getMessage());
  94             } finally {
  95                 socket = null;
  96                 outputStream = null;
  97                 inputStream = null;
  98             }
  99         }
 100
 101         super.dispose();
 102     }
 103
 104     @Override
 105     protected @Nullable String requestResponse(String commandAsString) {
 106         synchronized (this) {
 107             if (getThing().getStatus() == ThingStatus.ONLINE) {
 108                 NetworkOceanicBindingConfiguration config = getConfigAs(NetworkOceanicBindingConfiguration.class);
 109                 Throttler.lock(config.ipAddress);
 110
 111                 String request = commandAsString + "\r";
 112
 113                 byte[] dataBuffer = new byte[bufferSize];
 114                 byte[] tmpData = new byte[bufferSize];
 115                 String line;
 116                 int len = -1;
 117                 int index = 0;
 118                 boolean sequenceFound = false;
 119
 120                 final byte lineFeed = (byte) '\n';
 121                 final byte carriageReturn = (byte) '\r';
 122                 final byte nullChar = (byte) '\0';
 123                 final byte eChar = (byte) 'E';
 124                 final byte rChar = (byte) 'R';
 125
 126                 try {
 127                     logger.debug("Sending request '{}'", request);
 128
 129                     outputStream.write(request.getBytes());
 130                     outputStream.flush();
 131
 132                     while (true) {
 133                         if ((len = inputStream.read(tmpData)) > -1) {
 134                             if (logger.isTraceEnabled()) {
 135                                 StringBuilder sb = new StringBuilder();
 136                                 for (int i = 0; i < len; i++) {
 137                                     sb.append(String.format("%02X ", tmpData[i]));
 138                                 }
 139                                 logger.trace("Read {} bytes : {}", len, sb.toString());
 140                             }
 141
 142                             for (int i = 0; i < len; i++) {
 143                                 if (logger.isTraceEnabled()) {
 144                                     logger.trace("Byte {} equals '{}' (hex '{}')", i,
 145                                             new String(new byte[] { tmpData[i] }), String.format("%02X", tmpData[i]));
 146                                 }
 147
 148                                 if (tmpData[i] == nullChar && !sequenceFound) {
 149                                     sequenceFound = true;
 150                                     logger.trace("Start of sequence found");
 151                                 }
 152
 153                                 if (sequenceFound && tmpData[i] != lineFeed && tmpData[i] != carriageReturn
 154                                         && tmpData[i] != nullChar) {
 155                                     dataBuffer[index++] = tmpData[i];
 156                                     if (logger.isTraceEnabled()) {
 157                                         logger.trace("dataBuffer[{}] set to '{}'(hex '{}')", index - 1,
 158                                                 new String(new byte[] { dataBuffer[index - 1] }),
 159                                                 String.format("%02X", dataBuffer[index - 1]));
 160                                     }
 161                                 }
 162
 163                                 if (sequenceFound && i >= 2) {
 164                                     if (tmpData[i - 2] == eChar && tmpData[i - 1] == rChar && tmpData[i] == rChar) {
 165                                         // Received ERR from the device.
 166                                         return null;
 167                                     }
 168                                 }
 169
 170                                 if (sequenceFound && i > 0
 171                                         && (tmpData[i - 1] != carriageReturn && tmpData[i] == nullChar)) {
 172                                     index = 0;
 173                                     // Ignore trash received
 174                                     if (logger.isTraceEnabled()) {
 175                                         StringBuilder sb = new StringBuilder();
 176                                         for (int j = 0; j < i; j++) {
 177                                             sb.append(String.format("%02X ", tmpData[j]));
 178                                         }
 179                                         logger.trace("Ingoring {} bytes : {}", i, sb);
 180                                     }
 181                                 }
 182
 183                                 if (sequenceFound && (tmpData[i] == carriageReturn)) {
 184                                     if (index > 0) {
 185                                         line = new String(Arrays.copyOf(dataBuffer, index));
 186                                         logger.debug("Received response '{}'", line);
 187                                         line = StringUtils.chomp(line);
 188                                         line = line.replace(",", ".");
 189                                         line = line.trim();
 190                                         index = 0;
 191
 192                                         return line;
 193                                     }
 194                                 }
 195
 196                                 if (index == bufferSize) {
 197                                     index = 0;
 198                                 }
 199                             }
 200                         }
 201
 202                     }
 203                 } catch (IOException e) {
 204                     logger.debug("An exception occurred while quering host {}:{} : '{}'", config.ipAddress,
 205                             config.portNumber, e.getMessage(), e);
 206                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, e.getMessage());
 207                     reconnectJob = scheduler.schedule(reconnectRunnable, RECONNECT_INTERVAL, TimeUnit.SECONDS);
 208                 } finally {
 209                     Throttler.unlock(config.ipAddress);
 210                 }
 211             }
 212             return null;
 213         }
 214     }
 215
 216     private Runnable reconnectRunnable = () -> {
 217         dispose();
 218         initialize();
 219     };
 220 }