// Constants for database table names
const DB_TABLE_NODE_DHT = 'node_dht';
+ // Constants for database column names
+ const DB_COLUMN_NODE_ID = 'node_id';
+ const DB_COLUMN_SESSION_ID = 'session_id';
+ const DB_COLUMN_IP_PORT = 'ip_port';
+ const DB_COLUMN_PRIVATE_KEY = 'private_key';
+ const DB_COLUMN_PRIVATE_KEY_HASH = 'private_key_hash';
+ const DB_COLUMN_NODE_TYPE = 'node_type';
+
/**
* Protected constructor
*
// Return the instance
return $wrapperInstance;
}
+
+ /**
+ * Prepares an instance of a StoreableCriteria class with all node data for
+ * insert/update queries.
+ *
+ * @return $dataSetInstance An instance of a StoreableCriteria class
+ */
+ private function prepareDataSetInstance () {
+ // Get node/request instances
+ $nodeInstance = Registry::getRegistry()->getInstance('node');
+ $requestInstance = ApplicationHelper::getSelfInstance()->getRequestInstance();
+
+ // Get a dataset instance
+ $dataSetInstance = ObjectFactory::createObjectByConfiguredName('dataset_criteria_class', array(self::DB_TABLE_NODE_DHT));
+
+ // Set the primary key
+ $dataSetInstance->setUniqueKey(self::DB_COLUMN_NODE_ID);
+
+ // Add public node data
+ $dataSetInstance->addCriteria(self::DB_COLUMN_NODE_TYPE , $requestInstance->getRequestElement('mode'));
+ $dataSetInstance->addCriteria(self::DB_COLUMN_IP_PORT , $nodeInstance->getAddressPort());
+ $dataSetInstance->addCriteria(self::DB_COLUMN_NODE_ID , $nodeInstance->getNodeId());
+ $dataSetInstance->addCriteria(self::DB_COLUMN_SESSION_ID , $nodeInstance->getSessionId());
+ $dataSetInstance->addCriteria(self::DB_COLUMN_PRIVATE_KEY_HASH, $nodeInstance->getPrivateKeyHash());
+
+ // Return it
+ return $dataSetInstance;
+ }
+
+ /**
+ * Checks whether the local (*this*) node is registered in the DHT by
+ * checking if the external ip/port is found.
+ *
+ * @return $isRegistered Whether *this* node is registered in the DHT
+ */
+ public function isLocalNodeRegistered () {
+ // Is there cache?
+ if (!isset($GLOBALS[__METHOD__])) {
+ // Get a search criteria instance
+ $searchInstance = ObjectFactory::createObjectByConfiguredName('search_criteria_class');
+
+ // Get node instance
+ $nodeInstance = Registry::getRegistry()->getInstance('node');
+
+ // Add ip:port as criteria
+ $searchInstance->addCriteria(self::DB_COLUMN_IP_PORT, $nodeInstance->getAddressPort());
+ $searchInstance->setLimit(1);
+
+ // Query database and get a result instance back
+ $resultInstance = $this->doSelectByCriteria($searchInstance);
+
+ // Cache result of if there is an entry, next() will tell us if the next entry is valid
+ $GLOBALS[__METHOD__] = $resultInstance->next();
+ } // END - if
+
+ // Return result
+ return $GLOBALS[__METHOD__];
+ }
+
+ /**
+ * Registeres the local (*this*) node with its data in the DHT.
+ *
+ * @return void
+ */
+ public function registerLocalNode () {
+ // Assert to make sure this method is called with no record in DB (the actual backend of the DHT)
+ assert(!$this->isLocalNodeRegistered());
+
+ // Get prepared data set instance
+ $dataSetInstance = $this->prepareDataSetInstance();
+
+ // "Insert" this dataset instance completely into the database
+ $this->queryInsertDataSet($dataSetInstance);
+ }
+
+ /**
+ * Updates local (*this*) node data in DHT, this is but not limited to the
+ * session id, ip number (and/or hostname) and port number.
+ *
+ * @return void
+ */
+ public function updateLocalNode () {
+ // Assert to make sure this method is called with one record in DB (the actual backend of the DHT)
+ assert($this->isLocalNodeRegistered());
+
+ // Get node instance
+ $nodeInstance = Registry::getRegistry()->getInstance('node');
+
+ // Get search criteria
+ $searchInstance = ObjectFactory::createObjectByConfiguredName('search_criteria_class');
+
+ // Search for node id and limit it to one entry
+ $searchInstance->addCriteria(self::DB_COLUMN_NODE_ID, $nodeInstance->getNodeId());
+ $searchInstance->setLimit(1);
+
+ // Get a prepared dataset instance
+ $dataSetInstance = $this->prepareDataSetInstance();
+
+ // Set search instance
+ $dataSetInstance->setSearchInstance($searchInstance);
+
+ // Update DHT database record
+ $this->queryUpdateDataSet($dataSetInstance);
+ }
+
+ /**
+ * Finds a node by given session id
+ *
+ * @param $sessionId Session id to lookup
+ * @return $nodeData Node data array
+ */
+ public function findNodeBySessionId ($sessionId) {
+ // Get search criteria
+ $searchInstance = ObjectFactory::createObjectByConfiguredName('search_criteria_class');
+
+ // Get node instance
+ $nodeInstance = Registry::getRegistry()->getInstance('node');
+
+ // Search for session id and limit it to one entry
+ $searchInstance->addCriteria(self::DB_COLUMN_SESSION_ID, $nodeInstance->getSessionId());
+ $searchInstance->setLimit(1);
+
+ // Query database and get a result instance back
+ $resultInstance = $this->doSelectByCriteria($searchInstance);
+
+ // Return result instance
+ return $resultInstance;
+ }
}
// [EOF]
projects / hub.git / blobdiff