3 * A database wrapper for peer state lookups
5 * @author Roland Haeder <webmaster@ship-simu.org>
7 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2011 Hub Developer Team
8 * @license GNU GPL 3.0 or any newer version
9 * @link http://www.ship-simu.org
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 class PeerStateLookupDatabaseWrapper extends BaseDatabaseWrapper implements LookupablePeerState {
25 // Exception constants
26 const EXCEPTION_PEER_ALREADY_REGISTERED = 0x300;
28 // Constants for database table names
29 const DB_TABLE_PEER_LOOKUP = 'peer_states';
31 // Constants for database column names
32 const DB_COLUMN_PEER_IP = 'peer_ip';
33 const DB_COLUMN_PEER_PORT = 'peer_port';
34 const DB_COLUMN_PEER_SESSION_ID = 'peer_session_id';
35 const DB_COLUMN_PEER_STATE = 'peer_state';
36 const DB_COLUMN_SOCKET_ERROR_CODE = 'socket_error_code';
37 const DB_COLUMN_SOCKET_ERROR_MSG = 'socket_error_msg';
40 * Protected constructor
44 protected function __construct () {
45 // Call parent constructor
46 parent::__construct(__CLASS__);
50 * Creates an instance of this database wrapper by a provided user class
52 * @return $wrapperInstance An instance of the created wrapper class
54 public static final function createPeerStateLookupDatabaseWrapper () {
56 $wrapperInstance = new PeerStateLookupDatabaseWrapper();
58 // Set (primary!) table name
59 $wrapperInstance->setTableName(self::DB_TABLE_PEER_LOOKUP);
61 // Return the instance
62 return $wrapperInstance;
66 * "Getter" for a LocalSearchCriteria from given package data's sender
68 * @param $packageData Valid raw package data array
69 * @return $searchInstance An instance of a LocalSearchCriteria class
71 private function getSenderSearchInstanceFromPackageData (array $packageData) {
73 //* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: Searching for sender ' . $packageData[NetworkPackage::PACKAGE_DATA_SENDER]);
74 $searchInstance = ObjectFactory::createObjectByConfiguredName('search_criteria_class');
76 // Add 'sender' as the peer's IP address
77 $searchInstance->addCriteria(self::DB_COLUMN_PEER_SESSION_ID, $packageData[NetworkPackage::PACKAGE_DATA_SENDER]);
78 $searchInstance->setLimit(1);
80 // Return the instance
81 return $searchInstance;
85 * Getter for index key
87 * @return $indexKey Index key
89 public final function getIndexKey () {
90 return $this->getDatabaseInstance()->getIndexKey();
94 * Checks wether given 'sender' is a new peer
96 * @param $packageData Raw package data
97 * @param $dataSetInstance An optional instance of a StoreableCriteria class
98 * @return $isNewPeer Wether 'sender' is a new peer to this peer
100 public function isSenderNewPeer (array $packageData, StoreableCriteria $dataSetInstance = NULL) {
102 //* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: ' . __FUNCTION__ . ' called with packageData()=' . count($packageData) . ' - ENTERED!');
104 // Is always new peer by default
107 // Is the package valid?
108 if (!isset($packageData[NetworkPackage::PACKAGE_DATA_SENDER])) {
109 // Invalid package found, please report this
110 $this->debugBackTrace(__METHOD__ . ': packageData=' . print_r($packageData, true));
113 // Get a search criteria instance from package data
114 $searchInstance = $this->getSenderSearchInstanceFromPackageData($packageData);
116 // Is the dataset instance set?
117 if ($dataSetInstance instanceof StoreableCriteria) {
118 // Then remember the search instance in it
119 $dataSetInstance->setSearchInstance($searchInstance);
123 $entries = $this->doSelectCountByCriteria($searchInstance, array(self::DB_COLUMN_PEER_SESSION_ID => true));
126 //* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: entries=' . $entries);
127 $isNewPeer = ($entries != 1);
130 //* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: isNewPeer=' . intval($isNewPeer) . ' - EXIT!');
135 * Registers a new peer with given package data. We use the session id from it.
137 * @param $packageData Raw package data
138 * @param $socketResource A valid socket resource
140 * @throws PeerAlreadyRegisteredException If a peer is already registered
142 public function registerPeerByPackageData (array $packageData, $socketResource) {
143 // Make sure only new peers can be registered with package data
144 if (!$this->isSenderNewPeer($packageData)) {
145 // Throw an exception because this should normally not happen
146 throw new PeerAlreadyRegisteredException(array($this, $packageData), self::EXCEPTION_PEER_ALREADY_REGISTERED);
149 // Generate a dataset instance
150 $dataSetInstance = ObjectFactory::createObjectByConfiguredName('dataset_criteria_class', array(self::DB_TABLE_PEER_LOOKUP));
152 // Session ids must be unique
153 $dataSetInstance->setUniqueKey(self::DB_COLUMN_PEER_SESSION_ID);
156 $dataSetInstance->addCriteria(self::DB_COLUMN_PEER_SESSION_ID, $packageData[NetworkPackage::PACKAGE_DATA_SENDER]);
159 if (!@socket_getpeername($socketResource, $peerName, $peerPort)) {
161 $lastError = socket_last_error($socketResource);
163 // ... and cleartext message from it and put both into criteria
164 $dataSetInstance->addCriteria(self::DB_COLUMN_SOCKET_ERROR_CODE, $lastError);
165 $dataSetInstance->addCriteria(self::DB_COLUMN_SOCKET_ERROR_MSG , socket_strerror($lastError));
168 // Add ip address and port
169 $dataSetInstance->addCriteria(self::DB_COLUMN_PEER_IP , $peerName);
170 $dataSetInstance->addCriteria(self::DB_COLUMN_PEER_PORT, $peerPort);
172 // "Insert" the data set
173 $this->queryInsertDataSet($dataSetInstance, array(self::DB_COLUMN_PEER_SESSION_ID => true));
176 /* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: Peer ' . $packageData[NetworkPackage::PACKAGE_DATA_SENDER] . ' has been registered.');
180 * Registers the given peer state and raw package data
182 * @param $stateInstance A PeerStateable class instance
183 * @param $packageData Valid package data array
185 * @throws PeerAlreadyRegisteredException If a peer is already registered
186 * @todo Unfinished area
188 public function registerPeerState (PeerStateable $stateInstance, array $packageData) {
189 // Generate a dataset instance
190 $dataSetInstance = ObjectFactory::createObjectByConfiguredName('dataset_criteria_class', array(self::DB_TABLE_PEER_LOOKUP));
192 // Session ids must be unique
193 $dataSetInstance->setUniqueKey(self::DB_COLUMN_PEER_SESSION_ID);
196 $dataSetInstance->addCriteria(self::DB_COLUMN_PEER_SESSION_ID, $packageData[NetworkPackage::PACKAGE_DATA_SENDER]);
197 $dataSetInstance->addCriteria(self::DB_COLUMN_PEER_STATE , $stateInstance->getStateName());
199 // Try to resolve sender's session id
200 $senderData = explode(':', HubTools::resolveSessionId($packageData[NetworkPackage::PACKAGE_DATA_SENDER]));
202 // Just make sure that 'invalid:invalid' is not being processed
203 assert(($senderData[0] != 'invalid') && ($senderData[1] != 'invalid'));
205 // Add ip address and port
206 $dataSetInstance->addCriteria(self::DB_COLUMN_PEER_IP , $senderData[0]);
207 $dataSetInstance->addCriteria(self::DB_COLUMN_PEER_PORT, $senderData[1]);
209 // Is this a new peer?
210 if ($this->isSenderNewPeer($packageData, $dataSetInstance)) {
211 // "Insert" the data set
212 $this->queryInsertDataSet($dataSetInstance, array(self::DB_COLUMN_PEER_SESSION_ID => true));
214 // Update the data set
215 $this->queryUpdateDataSet($dataSetInstance, array(self::DB_COLUMN_PEER_SESSION_ID => true));
219 /* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: Peer ' . $packageData[NetworkPackage::PACKAGE_DATA_SENDER] . ' has been registered/updated with state ' . $stateInstance->getStateName());
223 * Purges old entries of given socket resource. We use the IP address from that resource.
225 * @param $socketResource A valid socket resource
227 * @throws InvalidSocketException If the socket resource was invalid
228 * @todo Unfinished area
230 public function purgeOldEntriesBySocketResource ($socketResource) {
232 if (!@socket_getpeername($socketResource, $peerName, $peerPort)) {
234 $lastError = socket_last_error($socketResource);
237 throw new InvalidSocketException(array($this, gettype($socketResource), $lastError, socket_strerror($lastError)), BaseListener::EXCEPTION_INVALID_SOCKET);
241 /* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: peerName=' . $peerName . ',peerPort=' . $peerPort . ' - UNFINISHED!');
245 * Checks wether a given peer state (in helper instance) has changed from
246 * stored one in database.
248 * @param $helperInstance An instance of a ConnectionHelper class
249 * @param $packageData Valid package data array
250 * @return $isPeerStateChanged Wether the peer's state has changed
252 public function ifPeerStateHasChanged (ConnectionHelper $helperInstance, array $packageData) {
254 /* NOISY-DEBUG: */ $this->debugOutput('DATABASE-WRAPPER: State ' . $helperInstance->getPrintableState() . ' needs to be checked it it has changed ...');
256 // By default the peer's state has not changed
257 $isPeerStateChanged = false;
260 return $isPeerStateChanged;