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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.airvisualnode.internal.discovery;
  14
  15 import java.io.IOException;
  16 import java.net.UnknownHostException;
  17 import java.util.Collections;
  18 import java.util.concurrent.ScheduledFuture;
  19 import java.util.concurrent.TimeUnit;
  20 import java.util.regex.Matcher;
  21 import java.util.regex.Pattern;
  22
  23 import org.openhab.binding.airvisualnode.internal.AirVisualNodeBindingConstants;
  24 import org.openhab.binding.airvisualnode.internal.config.AirVisualNodeConfig;
  25 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  26 import org.openhab.core.config.discovery.DiscoveryResult;
  27 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  28 import org.openhab.core.config.discovery.DiscoveryService;
  29 import org.openhab.core.thing.ThingUID;
  30 import org.osgi.service.component.annotations.Component;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 import jcifs.netbios.NbtAddress;
  35 import jcifs.smb.SmbFile;
  36
  37 /**
  38  * Autodiscovery for AirVisual Node by searching for a host advertised with the NetBIOS name 'AVISUAL-<SerialNumber>'.
  39  *
  40  * @author Victor Antonovich - Initial contribution
  41  */
  42 @Component(service = DiscoveryService.class)
  43 public class AirVisualNodeDiscoveryService extends AbstractDiscoveryService {
  44
  45     private final Logger logger = LoggerFactory.getLogger(AirVisualNodeDiscoveryService.class);
  46
  47     public static final String AVISUAL_WORKGROUP_NAME = "MSHOME";
  48
  49     private static final Pattern AVISUAL_NAME_PATTERN = Pattern.compile("^AVISUAL-([^/]+)$");
  50
  51     private ScheduledFuture<?> backgroundDiscoveryFuture;
  52
  53     public AirVisualNodeDiscoveryService() {
  54         super(Collections.singleton(AirVisualNodeBindingConstants.THING_TYPE_AVNODE), 600, true);
  55     }
  56
  57     @Override
  58     protected void startScan() {
  59         logger.debug("Starting scan");
  60         scheduler.execute(this::scan);
  61     }
  62
  63     @Override
  64     protected void startBackgroundDiscovery() {
  65         logger.debug("Starting background discovery");
  66         backgroundDiscoveryFuture = scheduler.scheduleWithFixedDelay(this::scan, 0, 5, TimeUnit.MINUTES);
  67     }
  68
  69     @Override
  70     protected void stopBackgroundDiscovery() {
  71         logger.debug("Stopping background discovery");
  72         cancelBackgroundDiscoveryFuture();
  73         super.stopBackgroundDiscovery();
  74     }
  75
  76     private void cancelBackgroundDiscoveryFuture() {
  77         if (backgroundDiscoveryFuture != null && !backgroundDiscoveryFuture.isDone()) {
  78             backgroundDiscoveryFuture.cancel(true);
  79             backgroundDiscoveryFuture = null;
  80         }
  81     }
  82
  83     private void scan() {
  84         // Get all workgroup members
  85         SmbFile[] workgroupMembers;
  86         try {
  87             String workgroupUrl = "smb://" + AVISUAL_WORKGROUP_NAME + "/";
  88             workgroupMembers = new SmbFile(workgroupUrl).listFiles();
  89         } catch (IOException e) {
  90             // Can't get workgroup member list
  91             return;
  92         }
  93
  94         // Check found workgroup members for the Node devices
  95         for (SmbFile s : workgroupMembers) {
  96             String serverName = s.getServer();
  97
  98             // Check workgroup member for the Node device name match
  99             Matcher m = AVISUAL_NAME_PATTERN.matcher(serverName);
 100             if (!m.find()) {
 101                 // Workgroup member server name doesn't match the Node device name pattern
 102                 continue;
 103             }
 104
 105             // Extract the Node serial number from device name
 106             String nodeSerialNumber = m.group(1);
 107
 108             // The Node Thing UID is serial number converted to lower case
 109             ThingUID thingUID = new ThingUID(AirVisualNodeBindingConstants.THING_TYPE_AVNODE,
 110                     nodeSerialNumber.toLowerCase());
 111
 112             try {
 113                 // Get the Node address by name
 114                 NbtAddress nodeNbtAddress = NbtAddress.getByName(serverName);
 115                 if (nodeNbtAddress == null) {
 116                     // The Node address not found by some reason, skip it
 117                     continue;
 118                 }
 119
 120                 // Create discovery result
 121                 String nodeAddress = nodeNbtAddress.getInetAddress().getHostAddress();
 122                 DiscoveryResult result = DiscoveryResultBuilder.create(thingUID)
 123                         .withProperty(AirVisualNodeConfig.ADDRESS, nodeAddress)
 124                         .withRepresentationProperty(AirVisualNodeConfig.ADDRESS)
 125                         .withLabel("AirVisual Node (" + nodeSerialNumber + ")").build();
 126                 thingDiscovered(result);
 127             } catch (UnknownHostException e) {
 128                 logger.debug("The Node address resolving failed ", e);
 129             }
 130         }
 131     }
 132 }