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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.knx.internal.client;
  14
  15 import java.nio.ByteBuffer;
  16 import java.text.MessageFormat;
  17 import java.util.concurrent.TimeUnit;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 import tuwien.auto.calimero.IndividualAddress;
  25 import tuwien.auto.calimero.KNXException;
  26 import tuwien.auto.calimero.mgmt.Destination;
  27 import tuwien.auto.calimero.mgmt.ManagementClient;
  28
  29 /**
  30  * Client for retrieving additional device descriptions.
  31  *
  32  * @author Simon Kaufmann - initial contribution and API.
  33  *
  34  */
  35 @NonNullByDefault
  36 public class DeviceInfoClientImpl implements DeviceInfoClient {
  37
  38     private final Logger logger = LoggerFactory.getLogger(DeviceInfoClientImpl.class);
  39     private final ManagementClient managementClient;
  40
  41     DeviceInfoClientImpl(ManagementClient managementClient) {
  42         this.managementClient = managementClient;
  43     }
  44
  45     @FunctionalInterface
  46     private interface ReadFunction<T, R> {
  47         @Nullable
  48         R apply(T t) throws KNXException, InterruptedException;
  49     }
  50
  51     private byte @Nullable [] readFromManagementClient(String task, long timeout, IndividualAddress address,
  52             ReadFunction<Destination, byte[]> function) {
  53         final long start = System.nanoTime();
  54         while ((System.nanoTime() - start) < TimeUnit.MILLISECONDS.toNanos(timeout)) {
  55             Destination destination = null;
  56             try {
  57                 logger.trace("Going to {} of {} ", task, address);
  58                 destination = managementClient.createDestination(address, true);
  59                 byte[] result = function.apply(destination);
  60                 logger.trace("Finished to {} of {}, result: {}", task, address, result == null ? null : result.length);
  61                 return result;
  62             } catch (KNXException e) {
  63                 logger.debug("Could not {} of {}: {}", task, address, e.getMessage());
  64             } catch (InterruptedException e) {
  65                 logger.trace("Interrupted to {}", task);
  66                 return null;
  67             } finally {
  68                 if (destination != null) {
  69                     destination.destroy();
  70                 }
  71             }
  72         }
  73         return null;
  74     }
  75
  76     private void authorize(boolean authenticate, Destination destination) throws KNXException, InterruptedException {
  77         if (authenticate) {
  78             managementClient.authorize(destination, (ByteBuffer.allocate(4)).put((byte) 0xFF).put((byte) 0xFF)
  79                     .put((byte) 0xFF).put((byte) 0xFF).array());
  80         }
  81     }
  82
  83     @Override
  84     public synchronized byte @Nullable [] readDeviceDescription(IndividualAddress address, int descType,
  85             boolean authenticate, long timeout) {
  86         String task = "read the device description";
  87         return readFromManagementClient(task, timeout, address, destination -> {
  88             authorize(authenticate, destination);
  89             return managementClient.readDeviceDesc(destination, descType);
  90         });
  91     }
  92
  93     @Override
  94     public synchronized byte @Nullable [] readDeviceMemory(IndividualAddress address, int startAddress, int bytes,
  95             boolean authenticate, long timeout) {
  96         String task = MessageFormat.format("read {0} bytes at memory location {1}", bytes, startAddress);
  97         return readFromManagementClient(task, timeout, address, destination -> {
  98             authorize(authenticate, destination);
  99             return managementClient.readMemory(destination, startAddress, bytes);
 100         });
 101     }
 102
 103     @Override
 104     public synchronized byte @Nullable [] readDeviceProperties(IndividualAddress address,
 105             final int interfaceObjectIndex, final int propertyId, final int start, final int elements,
 106             boolean authenticate, long timeout) {
 107         String task = MessageFormat.format("read device property {0} at index {1}", propertyId, interfaceObjectIndex);
 108         return readFromManagementClient(task, timeout, address, destination -> {
 109             authorize(authenticate, destination);
 110             return managementClient.readProperty(destination, interfaceObjectIndex, propertyId, start, elements);
 111         });
 112     }
 113
 114     @Override
 115     public boolean isConnected() {
 116         return managementClient.isOpen();
 117     }
 118 }