- Improve performance by avoiding unnecessary updates to the session table (#1486325)
alecpl
15 years ago
parent
a72ad65724
commit
929a508d80
@ -0,0 +1,330 @@
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<?php
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/*
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+-----------------------------------------------------------------------+
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| program/include/rcube_session.php |
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| |
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| This file is part of the RoundCube Webmail client |
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| Copyright (C) 2005-2009, RoundCube Dev. - Switzerland |
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| Licensed under the GNU GPL |
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| |
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| PURPOSE: |
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| Provide database supported session management |
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| |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-----------------------------------------------------------------------+
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$Id: session.inc 2932 2009-09-07 12:51:21Z alec $
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*/
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class rcube_session
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{
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private $db;
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private $ip;
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private $changed;
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private $unsets = array();
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private $gc_handlers = array();
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private $start;
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private $vars = false;
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private $key;
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private $keep_alive = 0;
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/**
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* Default constructor
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*/
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public function __construct($db, $lifetime=60)
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{
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$this->db = $db;
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$this->lifetime = $lifetime;
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$this->start = microtime(true);
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// set custom functions for PHP session management
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session_set_save_handler(
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array($this, 'open'),
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array($this, 'close'),
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array($this, 'read'),
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array($this, 'write'),
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array($this, 'destroy'),
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array($this, 'gc'));
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}
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public function open($save_path, $session_name)
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{
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return true;
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}
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public function close()
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{
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return true;
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}
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// read session data
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public function read($key)
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{
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$sql_result = $this->db->query(
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sprintf("SELECT vars, ip, %s AS changed FROM %s WHERE sess_id = ?",
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$this->db->unixtimestamp('changed'), get_table_name('session')),
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$key);
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if ($sql_arr = $this->db->fetch_assoc($sql_result)) {
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$this->changed = $sql_arr['changed'];
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$this->vars = $sql_arr['vars'];
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$this->ip = $sql_arr['ip'];
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$this->key = $key;
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if (!empty($sql_arr['vars']))
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return $sql_arr['vars'];
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}
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return false;
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}
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// save session data
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public function write($key, $vars)
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{
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$ts = microtime(true);
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$now = $this->db->fromunixtime((int)$ts);
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// use internal data from read() for fast requests (up to 0.5 sec.)
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if ($key == $this->key && $ts - $this->start < 0.5) {
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$oldvars = $this->vars;
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} else { // else read data again from DB
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$oldvars = $this->read($key);
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}
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if ($oldvars !== false) {
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$a_oldvars = $this->unserialize($oldvars);
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foreach ((array)$this->unsets as $k)
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unset($a_oldvars[$k]);
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$newvars = $this->serialize(array_merge(
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(array)$a_oldvars, (array)$this->unserialize($vars)));
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if ($this->keep_alive>0) {
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$timeout = min($this->lifetime * 0.5,
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$this->lifetime - $this->keep_alive);
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} else {
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$timeout = 0;
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}
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if (!($newvars === $oldvars) || ($ts - $this->changed > $timeout)) {
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$this->db->query(
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sprintf("UPDATE %s SET vars = ?, changed = %s WHERE sess_id = ?",
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get_table_name('session'), $now),
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$newvars, $key);
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}
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}
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else {
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$this->db->query(
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sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ".
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"VALUES (?, ?, ?, %s, %s)",
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get_table_name('session'), $now, $now),
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$key, $vars, (string)$_SERVER['REMOTE_ADDR']);
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}
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$this->unsets = array();
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return true;
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}
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// handler for session_destroy()
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public function destroy($key)
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{
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$this->db->query(
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sprintf("DELETE FROM %s WHERE sess_id = ?", get_table_name('session')),
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$key);
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return true;
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}
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// garbage collecting function
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public function gc($maxlifetime)
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{
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// just delete all expired sessions
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$this->db->query(
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sprintf("DELETE FROM %s WHERE changed < %s",
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get_table_name('session'), $this->db->fromunixtime(time() - $maxlifetime)));
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foreach ($this->gc_handlers as $fct)
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$fct();
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return true;
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}
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// registering additional garbage collector functions
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public function register_gc_handler($func_name)
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{
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if ($func_name && !in_array($func_name, $this->gc_handlers))
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$this->gc_handlers[] = $func_name;
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}
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public function regenerate_id()
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{
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$randval = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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for ($random = '', $i=1; $i <= 32; $i++) {
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$random .= substr($randval, mt_rand(0,(strlen($randval) - 1)), 1);
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}
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// use md5 value for id or remove capitals from string $randval
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$random = md5($random);
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// delete old session record
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$this->destroy(session_id());
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session_id($random);
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$cookie = session_get_cookie_params();
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$lifetime = $cookie['lifetime'] ? time() + $cookie['lifetime'] : 0;
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rcmail::setcookie(session_name(), $random, $lifetime);
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return true;
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}
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// unset session variable
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public function remove($var=NULL)
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{
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if (empty($var))
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return $this->destroy(session_id());
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$this->unsets[] = $var;
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unset($_SESSION[$var]);
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return true;
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}
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// serialize session data
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private function serialize($vars)
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{
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$data = '';
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if (is_array($vars))
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foreach ($vars as $var=>$value)
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$data .= $var.'|'.serialize($value);
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else
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$data = 'b:0;';
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return $data;
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}
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// unserialize session data
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// http://www.php.net/manual/en/function.session-decode.php#56106
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private function unserialize($str)
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{
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$str = (string)$str;
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$endptr = strlen($str);
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$p = 0;
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$serialized = '';
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$items = 0;
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$level = 0;
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while ($p < $endptr) {
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$q = $p;
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while ($str[$q] != '|')
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if (++$q >= $endptr) break 2;
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if ($str[$p] == '!') {
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$p++;
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$has_value = false;
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} else {
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$has_value = true;
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}
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$name = substr($str, $p, $q - $p);
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$q++;
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$serialized .= 's:' . strlen($name) . ':"' . $name . '";';
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if ($has_value) {
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for (;;) {
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$p = $q;
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switch (strtolower($str[$q])) {
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case 'n': /* null */
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case 'b': /* boolean */
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case 'i': /* integer */
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case 'd': /* decimal */
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do $q++;
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while ( ($q < $endptr) && ($str[$q] != ';') );
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$q++;
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$serialized .= substr($str, $p, $q - $p);
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if ($level == 0) break 2;
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break;
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case 'r': /* reference */
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$q+= 2;
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for ($id = ''; ($q < $endptr) && ($str[$q] != ';'); $q++) $id .= $str[$q];
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$q++;
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$serialized .= 'R:' . ($id + 1) . ';'; /* increment pointer because of outer array */
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if ($level == 0) break 2;
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break;
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case 's': /* string */
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$q+=2;
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for ($length=''; ($q < $endptr) && ($str[$q] != ':'); $q++) $length .= $str[$q];
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$q+=2;
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$q+= (int)$length + 2;
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$serialized .= substr($str, $p, $q - $p);
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if ($level == 0) break 2;
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break;
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case 'a': /* array */
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case 'o': /* object */
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do $q++;
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while ( ($q < $endptr) && ($str[$q] != '{') );
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$q++;
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$level++;
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$serialized .= substr($str, $p, $q - $p);
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break;
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case '}': /* end of array|object */
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$q++;
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$serialized .= substr($str, $p, $q - $p);
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if (--$level == 0) break 2;
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break;
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default:
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return false;
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}
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}
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} else {
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$serialized .= 'N;';
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$q += 2;
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}
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$items++;
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$p = $q;
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}
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return unserialize( 'a:' . $items . ':{' . $serialized . '}' );
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}
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public function set_keep_alive($keep_alive)
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{
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$this->keep_alive = $keep_alive;
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}
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public function get_keep_alive()
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{
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return $this->keep_alive;
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}
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// getter for private variables
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public function get_ts()
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{
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return $this->changed;
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}
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// getter for private variables
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public function get_ip()
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{
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return $this->ip;
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}
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}
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