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<?php
/* vim:set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab: */
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <info�getid3*org> |
// | Allan Hansen <ah�artemis*dk> |
// +----------------------------------------------------------------------+
// | extension.cache.mysql.php |
// | MySQL Cache Extension. |
// | dependencies: getid3. |
// +----------------------------------------------------------------------+
//
// $Id: extension.cache.dbm.php,v 1.2 2006/11/02 10:47:59 ah Exp $
/**
* This is a caching extension for getID3(). It works the exact same
* way as the getID3 class, but return cached information very fast
*
* Example: (see also demo.cache.dbm.php in /demo/)
*
* Normal getID3 usage (example):
*
* require_once 'getid3/getid3.php';
* $getid3 = new getid3;
* $getid3->encoding = 'UTF-8';
* try {
* $info1 = $getid3->Analyse('file1.flac');
* $info2 = $getid3->Analyse('file2.wv');
* ....
*
* getID3_cached usage:
*
* require_once 'getid3/getid3.php';
* require_once 'getid3/getid3/extension.cache.mysql.php';
* $getid3 = new getid3_cached_mysql('localhost', 'database', 'username', 'password');
* $getid3->encoding = 'UTF-8';
* try {
* $info1 = $getid3->analyse('file1.flac');
* $info2 = $getid3->analyse('file2.wv');
* ...
*
*
* Supported Cache Types
*
* SQL Databases: (use extension.cache.mysql)
*
* cache_type cache_options
* -------------------------------------------------------------------
* mysql host, database, username, password
*
*
* DBM-Style Databases: (this extension)
*
* cache_type cache_options
* -------------------------------------------------------------------
* gdbm dbm_filename, lock_filename
* ndbm dbm_filename, lock_filename
* db2 dbm_filename, lock_filename
* db3 dbm_filename, lock_filename
* db4 dbm_filename, lock_filename (PHP5 required)
*
* PHP must have write access to both dbm_filename and lock_filename.
*
*
* Recommended Cache Types
*
* Infrequent updates, many reads any DBM
* Frequent updates mysql
*/
class getid3_cached_dbm extends getid3
{
public function __construct($cache_type, $dbm_filename, $lock_filename) {
// Check for dba extension
if (!extension_loaded('dba')) {
throw new getid3_exception('PHP is not compiled with dba support, required to use DBM style cache.');
}
if (!in_array($cache_type, dba_handlers())) {
throw new getid3_exception('PHP is not compiled --with '.$cache_type.' support, required to use DBM style cache.');
}
// Create lock file if needed
if (!file_exists($lock_filename)) {
if (!touch($lock_filename)) {
die('failed to create lock file: ' . $lock_filename);
}
}
// Open lock file for writing
if (!is_writeable($lock_filename)) {
die('lock file: ' . $lock_filename . ' is not writable');
}
$this->lock = fopen($lock_filename, 'w');
// Acquire exclusive write lock to lock file
flock($this->lock, LOCK_EX);
// Create dbm-file if needed
if (!file_exists($dbm_filename)) {
if (!touch($dbm_filename)) {
die('failed to create dbm file: ' . $dbm_filename);
}
}
// Try to open dbm file for writing
$this->dba = @dba_open($dbm_filename, 'w', $cache_type);
if (!$this->dba) {
// Failed - create new dbm file
$this->dba = dba_open($dbm_filename, 'n', $cache_type);
if (!$this->dba) {
die('failed to create dbm file: ' . $dbm_filename);
}
// Insert getID3 version number
dba_insert(getid3::VERSION, getid3::VERSION, $this->dba);
}
// Init misc values
$this->cache_type = $cache_type;
$this->dbm_filename = $dbm_filename;
// Register destructor
register_shutdown_function(array($this, '__destruct'));
// Check version number and clear cache if changed
if (dba_fetch(getid3::VERSION, $this->dba) != getid3::VERSION) {
$this->clear_cache();
}
parent::__construct();
}
public function __destruct() {
// Close dbm file
@dba_close($this->dba);
// Release exclusive lock
@flock($this->lock, LOCK_UN);
// Close lock file
@fclose($this->lock);
}
public function clear_cache() {
// Close dbm file
dba_close($this->dba);
// Create new dbm file
$this->dba = dba_open($this->dbm_filename, 'n', $this->cache_type);
if (!$this->dba) {
die('failed to clear cache/recreate dbm file: ' . $this->dbm_filename);
}
// Insert getID3 version number
dba_insert(getid3::VERSION, getid3::VERSION, $this->dba);
// Reregister shutdown function
register_shutdown_function(array($this, '__destruct'));
}
// public: analyze file
public function Analyze($filename) {
if (file_exists($filename)) {
// Calc key filename::mod_time::size - should be unique
$key = $filename . '::' . filemtime($filename) . '::' . filesize($filename);
// Loopup key
$result = dba_fetch($key, $this->dba);
// Hit
if ($result !== false) {
return unserialize($result);
}
}
// Miss
$result = parent::Analyze($filename);
// Save result
if (file_exists($filename)) {
dba_insert($key, serialize($result), $this->dba);
}
return $result;
}
}
?>
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