Aleksander Machniak
2013-06-16 3dbe4f79e42dc655444187e22356994a0d5c76ce
Fix session issues when local and database time differs (#1486132)
Improve performance by executing session gc on script shutdown, also call session_write_close() ASAP
4 files modified
127 ■■■■ changed files
CHANGELOG 1 ●●●● patch | view | raw | blame | history
program/include/rcmail.php 5 ●●●●● patch | view | raw | blame | history
program/lib/Roundcube/rcube.php 27 ●●●●● patch | view | raw | blame | history
program/lib/Roundcube/rcube_session.php 94 ●●●● patch | view | raw | blame | history
CHANGELOG
@@ -1,6 +1,7 @@
CHANGELOG Roundcube Webmail
===========================
- Fix session issues when local and database time differs (#1486132)
- Fix thread cache syncronization/validation (#1489028)
- Add option show_real_foldernames to disable localization of special folders
- Fix database cache expunge issues (#1489149)
program/include/rcmail.php
@@ -749,11 +749,6 @@
        $book->close();
    }
    // before closing the database connection, write session data
    if ($_SERVER['REMOTE_ADDR'] && is_object($this->session)) {
      $this->session->write_close();
    }
    // write performance stats to logs/console
    if ($this->config->get('devel_mode')) {
      if (function_exists('memory_get_usage'))
program/lib/Roundcube/rcube.php
@@ -99,7 +99,6 @@
    protected $texts;
    protected $caches = array();
    protected $shutdown_functions = array();
    protected $expunge_cache = false;
    /**
@@ -462,7 +461,7 @@
        // use database for storing session data
        $this->session = new rcube_session($this->get_dbh(), $this->config);
        $this->session->register_gc_handler(array($this, 'gc_handler'));
        $this->session->register_gc_handler(array($this, 'gc'));
        $this->session->set_secret($this->config->get('des_key') . dirname($_SERVER['SCRIPT_NAME']));
        $this->session->set_ip_check($this->config->get('ip_check'));
@@ -508,18 +507,6 @@
            closedir($dir);
        }
    }
    /**
     * Garbage collector for cache entries.
     * Set flag to expunge caches on shutdown
     */
    public function gc_handler()
    {
        // because this gc function is called before storage is initialized,
        // we just set a flag to expunge storage cache on shutdown.
        $this->expunge_cache = true;
    }
@@ -922,12 +909,16 @@
            call_user_func($function);
        }
        if (is_object($this->smtp)) {
            $this->smtp->disconnect();
        // write session data as soon as possible and before
        // closing database connection, don't do this before
        // registered shutdown functions, they may need the session
        // Note: this will run registered gc handlers (ie. cache gc)
        if ($_SERVER['REMOTE_ADDR'] && is_object($this->session)) {
            $this->session->write_close();
        }
        if ($this->expunge_cache) {
            $this->gc();
        if (is_object($this->smtp)) {
            $this->smtp->disconnect();
        }
        foreach ($this->caches as $cache) {
program/lib/Roundcube/rcube_session.php
@@ -32,6 +32,7 @@
    private $ip;
    private $start;
    private $changed;
    private $time_diff = 0;
    private $reloaded = false;
    private $unsets = array();
    private $gc_handlers = array();
@@ -93,7 +94,7 @@
                array($this, 'db_read'),
                array($this, 'db_write'),
                array($this, 'db_destroy'),
                array($this, 'db_gc'));
                array($this, 'gc'));
        }
    }
@@ -148,6 +149,11 @@
        }
        session_write_close();
        // write_close() is called on script shutdown, see rcube::shutdown()
        // execute cleanup functionality if enabled by session gc handler
        // we do this after closing the session for better performance
        $this->gc_shutdown();
    }
@@ -161,14 +167,16 @@
    public function db_read($key)
    {
        $sql_result = $this->db->query(
            "SELECT vars, ip, changed FROM ".$this->db->table_name('session')
            ." WHERE sess_id = ?", $key);
            "SELECT vars, ip, changed, " . $this->db->now() . " AS ts"
            . " FROM " . $this->db->table_name('session')
            . " WHERE sess_id = ?", $key);
        if ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
            $this->changed = strtotime($sql_arr['changed']);
            $this->ip      = $sql_arr['ip'];
            $this->vars    = base64_decode($sql_arr['vars']);
            $this->key     = $key;
            $this->time_diff = time() - strtotime($sql_arr['ts']);
            $this->changed   = strtotime($sql_arr['changed']);
            $this->ip        = $sql_arr['ip'];
            $this->vars      = base64_decode($sql_arr['vars']);
            $this->key       = $key;
            return !empty($this->vars) ? (string) $this->vars : '';
        }
@@ -188,8 +196,9 @@
     */
    public function db_write($key, $vars)
    {
        $ts  = microtime(true);
        $now = $this->db->fromunixtime((int)$ts);
        $now   = $this->db->now();
        $table = $this->db->table_name('session');
        $ts    = microtime(true);
        // no session row in DB (db_read() returns false)
        if (!$this->key) {
@@ -207,22 +216,19 @@
            $newvars = $this->_fixvars($vars, $oldvars);
            if ($newvars !== $oldvars) {
                $this->db->query(
                    sprintf("UPDATE %s SET vars=?, changed=%s WHERE sess_id=?",
                        $this->db->table_name('session'), $now),
                        base64_encode($newvars), $key);
                $this->db->query("UPDATE $table "
                    . "SET changed = $now, vars = ? WHERE sess_id = ?",
                    base64_encode($newvars), $key);
            }
            else if ($ts - $this->changed > $this->lifetime / 2) {
                $this->db->query("UPDATE ".$this->db->table_name('session')
                    ." SET changed=$now WHERE sess_id=?", $key);
            else if ($ts - $this->changed + $this->time_diff > $this->lifetime / 2) {
                $this->db->query("UPDATE $table SET changed = $now"
                    . " WHERE sess_id = ?", $key);
            }
        }
        else {
            $this->db->query(
                sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ".
                    "VALUES (?, ?, ?, %s, %s)",
                    $this->db->table_name('session'), $now, $now),
                    $key, base64_encode($vars), (string)$this->ip);
            $this->db->query("INSERT INTO $table (sess_id, vars, ip, created, changed)"
                . " VALUES (?, ?, ?, $now, $now)",
                $key, base64_encode($vars), (string)$this->ip);
        }
        return true;
@@ -276,25 +282,6 @@
            $this->db->query(sprintf("DELETE FROM %s WHERE sess_id = ?",
                $this->db->table_name('session')), $key);
        }
        return true;
    }
    /**
     * Garbage collecting function
     *
     * @param string Session lifetime in seconds
     * @return boolean True on success
     */
    public function db_gc($maxlifetime)
    {
        // just delete all expired sessions
        $this->db->query(
            sprintf("DELETE FROM %s WHERE changed < %s",
                $this->db->table_name('session'), $this->db->fromunixtime(time() - $maxlifetime)));
        $this->gc();
        return true;
    }
@@ -376,11 +363,11 @@
    /**
     * Execute registered garbage collector routines
     */
    public function gc()
    public function gc($maxlifetime)
    {
        foreach ($this->gc_handlers as $fct) {
            call_user_func($fct);
        }
        // move gc execution to the script shutdown function
        // see rcube::shutdown() and rcube_session::write_close()
        return $this->gc_enabled = $maxlifetime;
    }
@@ -402,6 +389,25 @@
    /**
     * Garbage collector handler to run on script shutdown
     */
    protected function gc_shutdown()
    {
        if ($this->gc_enabled) {
            // just delete all expired sessions
            if ($this->storage == 'db') {
                $this->db->query("DELETE FROM " . $this->db->table_name('session')
                    . " WHERE changed < " . $this->db->now(-$this->gc_enabled));
            }
            foreach ($this->gc_handlers as $fct) {
                call_user_func($fct);
            }
        }
    }
    /**
     * Generate and set new session id
     *
     * @param boolean $destroy If enabled the current session will be destroyed