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@@ -0,0 +1,203 @@
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+<?php
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+/* For licensing terms, see /license.txt */
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+/**
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+ * Definition of the SessionHandlerMemcache class
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+ * @package chamilo.library
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+ */
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+/**
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+ * Class SessionHandlerMemcache deals with volatile Memcache storage
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+ * and a more persistent but less frequent database backup storage
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+ * @todo This class might require a review to MySQL calls, depending on
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+ * when the session variables start to be saved
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+ */
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+class SessionHandlerMemcache
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+{
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+ public $connection;
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+ public $connection_handler;
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+ public $lifetime;
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+ public $session_name;
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+ public $memcache;
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+ public $initSessionData;
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+
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+ public function __construct()
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+ {
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+ global $_configuration;
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+
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+ $this->memcache = new Memcache;
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+ if (!empty($_configuration['memcache_server'])) {
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+ foreach ($_configuration['memcache_server'] as $serverData) {
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+ $isServerAvailable = @fsockopen($serverData['host'], $serverData['port']);
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+ if (!$isServerAvailable){
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+ continue;
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+ }
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+ $this->memcache->addServer($serverData['host'], $serverData['port']);
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+ }
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+ }
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+ $this->lifetime = 3600; // 60 minutes
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+
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+ $this->connection = array (
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+ 'server' => $_configuration['db_host'],
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+ 'login' => $_configuration['db_user'],
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+ 'password' => $_configuration['db_password'],
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+ 'base' => $_configuration['main_database']
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+ );
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+
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+ $this->connection_handler = false;
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+ }
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+
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+ public function sqlConnect()
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+ {
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+ if (!$this->connection_handler) {
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+ $this->connection_handler = @mysql_connect($this->connection['server'], $this->connection['login'], $this->connection['password'], true);
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+
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+ // The system has not been designed to use special SQL modes that were introduced since MySQL 5
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+ @mysql_query("set session sql_mode='';", $this->connection_handler);
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+
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+ @mysql_select_db($this->connection['base'], $this->connection_handler);
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+
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+ // Initialization of the database connection encoding to be used.
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+ // The internationalization library should be already initialized.
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+ @mysql_query("SET SESSION character_set_server='utf8';", $this->connection_handler);
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+ @mysql_query("SET SESSION collation_server='utf8_general_ci';", $this->connection_handler);
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+ $system_encoding = api_get_system_encoding();
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+ if (api_is_utf8($system_encoding)) {
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+ // See Bug #1802: For UTF-8 systems we prefer to use "SET NAMES 'utf8'" statement in order to avoid a bizarre problem with Chinese language.
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+ @mysql_query("SET NAMES 'utf8';", $this->connection_handler);
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+ } else {
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+ @mysql_query("SET CHARACTER SET '" . Database::to_db_encoding($system_encoding) . "';", $this->connection_handler);
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+ }
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+ }
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+
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+ return ($this->connection_handler) ? true : false;
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+ }
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+
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+ public function sqlClose()
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+ {
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+
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+ if ($this->connection_handler) {
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+ mysql_close($this->connection_handler);
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+ $this->connection_handler = false;
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+ return true;
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+ }
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+
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+ return false;
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+ }
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+
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+ public function sqlQuery($query, $dieOnError = true)
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+ {
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+ $result = mysql_query($query, $this->connection_handler);
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+ if ($dieOnError && !$result) {
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+ $this->sqlClose();
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+ return;
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+ }
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+
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+ return $result;
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+ }
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+
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+ public function open($savePath, $sessionName)
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+ {
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+ $sessionID = session_id();
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+ if ($sessionID !== "") {
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+ $this->initSessionData = $this->read($sessionID);
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+ $this->session_name = $sessionName;
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+ }
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+ return true;
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+ }
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+
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+ public function close()
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+ {
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+ $this->lifeTime = null;
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+ $this->memcache = null;
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+ $this->initSessionData = null;
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+
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+ return $this->gc(0) ? true : false;
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+ }
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+
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+ public function read($sessionID)
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+ {
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+ $data = $this->memcache->get($sessionID);
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+ if (($data === false || empty($data)) && $this->sqlConnect()) {
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+ $result = $this->sqlQuery("SELECT session_value FROM ".$this->connection['base'].".php_session WHERE session_id='$sessionID'");
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+ if (!empty($result) && $result !== false && $row = Database::fetch_row($result)) {
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+ $data = stripslashes($row[0]);
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+ $this->memcache->set($sessionID, $data);
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+ } else {
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+ $data = false;
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+ }
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+ } else {
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+ $data = stripslashes($data);
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+ }
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+
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+ return $data;
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+ }
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+
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+ public function write($sessionID, $data)
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+ {
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+ global $_configuration;
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+
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+ $this->memcache->set($sessionID, $data);
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+ if ($this->memcache->get('interactions-' . $sessionID) !== false) {
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+ $interactions = $this->memcache->get('interactions-' . $sessionID);
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+ ++$interactions;
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+ if ($_configuration['session_stored_after_n_times'] < $interactions) {
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+ $interactions = 1;
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+ }
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+ $this->memcache->set('interactions-' . $sessionID, $interactions);
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+ } else {
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+ $this->memcache->set('interactions-' . $sessionID, 1);
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+ }
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+
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+ $interactions = $this->memcache->get('interactions-' . $sessionID);
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+ //$this->initSessionData !== $data #avoid this validation for performance improvements
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+
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+ if ($_configuration['session_stored_after_n_times'] === $interactions) {
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+ $sessionID = mysql_real_escape_string($sessionID);
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+ $sessionExpirationTS = ($this->lifetime + time());
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+ $sessionData = mysql_real_escape_string($data);
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+
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+ if ($this->sqlConnect()) {
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+ $result = $this->sqlQuery("INSERT INTO ".$this->connection['base'].".php_session(
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+ session_id,session_name,session_time,session_start,session_value)
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+ VALUES('$sessionID','".$this->session_name."','$sessionExpirationTS','$sessionExpirationTS','".addslashes($sessionData)."')", false);
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+
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+ if (!$result) {
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+ $this->sqlQuery("UPDATE ".$this->connection['base'].".php_session
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+ SET session_name='".$this->session_name."',session_time='$sessionExpirationTS',session_value='".addslashes($sessionData)."'
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+ WHERE session_id='$sessionID'");
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+ }
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+ return true;
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+ }
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+ }
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+
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+ return false;
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+ }
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+
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+ public function destroy($sessionID)
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+ {
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+ $this->memcache->delete($sessionID);
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+ if ($this->sqlConnect()) {
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+ $this->sqlQuery("DELETE FROM ".$this->connection['base'].".php_session WHERE session_id='$sessionID'");
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+ return true;
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+ }
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+
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+ return false;
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+ }
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+
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+ public function gc($maxlifetime)
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+ {
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+ if ($this->sqlConnect()) {
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+ $result = $this->sqlQuery("SELECT COUNT(session_id) FROM ".$this->connection['base'].".php_session");
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+ list($nbr_results) = Database::fetch_row($result);
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+
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+ if ($nbr_results > 5000) {
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+ $this->sqlQuery("DELETE FROM ".$this->connection['base'].".php_session WHERE session_time<'".strtotime('-'.$this->lifetime.' minutes')."'");
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+ }
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+
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+ $this->sqlClose();
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+
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+ return true;
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+ }
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+
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+ return false;
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+ }
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+}
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