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   1 <?php
   2 // Own namespace
   3 namespace Hub\Handler\Node\Message\Request\NodeList;
   4
   5 // Import application-specific stuff
   6 use Hub\Database\Frontend\Node\Dht\NodeDistributedHashTableDatabaseWrapper;
   7 use Hub\Factory\Dht\DhtObjectFactory;
   8 use Hub\Factory\Node\NodeObjectFactory;
   9 use Hub\Network\Receive\Receivable;
  10 use Hub\Node\BaseHubNode;
  11
  12 // Import framework stuff
  13 use CoreFramework\Criteria\Storing\StoreableCriteria;
  14 use CoreFramework\Registry\Registerable;
  15
  16 /**
  17  * A NodeMessageRequestNodeList handler
  18  *
  19  * @author              Roland Haeder <webmaster@shipsimu.org>
  20  * @version             0.0.0
  21  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2015 Hub Developer Team
  22  * @license             GNU GPL 3.0 or any newer version
  23  * @link                http://www.shipsimu.org
  24  *
  25  * This program is free software: you can redistribute it and/or modify
  26  * it under the terms of the GNU General Public License as published by
  27  * the Free Software Foundation, either version 3 of the License, or
  28  * (at your option) any later version.
  29  *
  30  * This program is distributed in the hope that it will be useful,
  31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  * GNU General Public License for more details.
  34  *
  35  * You should have received a copy of the GNU General Public License
  36  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  37  */
  38 class NodeMessageRequestNodeListHandler extends BaseMessageHandler implements HandleableMessage, Registerable {
  39         /**
  40          * Protected constructor
  41          *
  42          * @return      void
  43          */
  44         protected function __construct () {
  45                 // Call parent constructor
  46                 parent::__construct(__CLASS__);
  47
  48                 // Set handler name
  49                 $this->setHandlerName('message_request_node_list');
  50
  51                 // Init message data array
  52                 $this->messageDataElements = array(
  53                         XmlRequestNodeListTemplateEngine::REQUEST_DATA_ACCEPTED_OBJECT_TYPES,
  54                 );
  55
  56                 // Init config-copy array
  57                 $this->configCopy = array(
  58                 );
  59
  60                 // Init search data array
  61                 $this->searchData = array(
  62                         XmlRequestNodeListTemplateEngine::REQUEST_DATA_SESSION_ID,
  63                 );
  64         }
  65
  66         /**
  67          * Creates an instance of this class
  68          *
  69          * @return      $handlerInstance        An instance of a HandleableMessage class
  70          */
  71         public final static function createNodeMessageRequestNodeListHandler () {
  72                 // Get new instance
  73                 $handlerInstance = new NodeMessageRequestNodeListHandler();
  74
  75                 // Return the prepared instance
  76                 return $handlerInstance;
  77         }
  78
  79         /**
  80          * Handles data array of the message
  81          *
  82          * @param       $messageData            An array with message data to handle
  83          * @param       $packageInstance        An instance of a Receivable class
  84          * @return      void
  85          * @throws      RequestNotAcceptedException             If this node does not accept this request
  86          */
  87         public function handleMessageData (array $messageData, Receivable $packageInstance) {
  88                 // Get node instance
  89                 $nodeInstance = NodeObjectFactory::createNodeInstance();
  90
  91                 // Is this node accepting announcements?
  92                 if (!$nodeInstance->isAcceptingNodeListRequests()) {
  93                         /*
  94                          * This node is not accepting node list requests. Throw an
  95                          * exception to abort any further processing.
  96                          */
  97                         throw new RequestNotAcceptedException(array($this, $nodeInstance, $messageData), self::EXCEPTION_REQUEST_NOT_ACCEPTED);
  98                 } // END - if
  99
 100                 // Register the announcing node with this node
 101                 $this->registerNodeByMessageData($messageData);
 102
 103                 // Prepare answer message to be delivered back to the other node
 104                 $this->prepareAnswerMessage($messageData, $packageInstance);
 105         }
 106
 107         /**
 108          * Adds all required elements from given array into data set instance
 109          *
 110          * @param       $dataSetInstance        An instance of a StoreableCriteria class
 111          * @param       $messageData            An array with all message data
 112          * @return      void
 113          */
 114         public function addArrayToDataSet (StoreableCriteria $dataSetInstance, array $messageData) {
 115                 // Add generic first
 116                 parent::addArrayToDataSet($dataSetInstance, $messageData);
 117
 118                 // Add all ements
 119                 foreach ($this->messageDataElements as $key) {
 120                         // Is it there?
 121                         assert(isset($messageData[$key]));
 122
 123                         // Add it
 124                         $dataSetInstance->addCriteria($key, $messageData[$key]);
 125                 } // END - foreach
 126         }
 127
 128         /**
 129          * Initializes configuration data from given message data array
 130          *
 131          * @param       $messageData    An array with all message data
 132          * @return      void
 133          */
 134         protected function initMessageConfigurationData (array $messageData) {
 135                 // Debug message
 136                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('REQUEST-HANDLER: messageData=' . print_r($messageData, TRUE));
 137
 138                 // "Walk" throught the config-copy array
 139                 foreach ($this->configCopy as $targetKey => $sourceKey) {
 140                         // Debug message
 141                         //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('REQUEST-HANDLER: Copying from sourceKey=' . $sourceKey . ' to targetKey=' . $targetKey . '...');
 142
 143                         // Copy from source to targetKey
 144                         $this->getConfigInstance()->setConfigEntry($targetKey, $this->getConfigInstance()->getConfigEntry($sourceKey));
 145                 } // END - foreach
 146
 147                 // Query local DHT for nodes except given session id
 148                 $nodeList = DhtObjectFactory::createDhtInstance('node')->queryLocalNodeListExceptByMessageData(
 149                         $messageData,
 150                         $this,
 151                         XmlRequestNodeListTemplateEngine::REQUEST_DATA_SESSION_ID,
 152                         XmlRequestNodeListTemplateEngine::REQUEST_DATA_ACCEPTED_OBJECT_TYPES,
 153                         BaseHubNode::OBJECT_LIST_SEPARATOR
 154                 );
 155
 156                 // Debug message
 157                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('REQUEST-HANDLER: Got a node list of ' . count($nodeList) . ' entry/-ies back.');
 158
 159                 // Set it serialized in configuration (temporarily)
 160                 $this->getConfigInstance()->setConfigEntry('node_list', base64_encode(json_encode($nodeList)));
 161
 162                 // Translate last exception into a status code
 163                 $statusCode = $this->getTranslatedStatusFromLastException();
 164
 165                 // Set it in configuration (temporarily)
 166                 $this->getConfigInstance()->setConfigEntry(NodeDistributedHashTableDatabaseWrapper::DB_COLUMN_ANSWER_STATUS, $statusCode);
 167         }
 168
 169         /**
 170          * Removes configuration data with given message data array from global
 171          * configuration
 172          *
 173          * @param       $messageData    An array with all message data
 174          * @return      void
 175          */
 176         protected function removeMessageConfigurationData (array $messageData) {
 177                 // "Walk" throught the config-copy array again
 178                 foreach ($this->configCopy as $configKey => $dummy) {
 179                         // Now unset this configuration entry (to save some memory again)
 180                         $this->getConfigInstance()->unsetConfigEntry($configKey);
 181                 } // END - foreach
 182
 183                 // Remove answer status/node list as well
 184                 $this->getConfigInstance()->unsetConfigEntry(NodeDistributedHashTableDatabaseWrapper::DB_COLUMN_ANSWER_STATUS);
 185                 $this->getConfigInstance()->unsetConfigEntry('node_list');
 186         }
 187 }
 188
 189 // [EOF]
 190 ?>