271 lines
8.2 KiB
PHP
271 lines
8.2 KiB
PHP
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at https://github.com/JamesHeinrich/getID3 //
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// or https://www.getid3.org //
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// or http://getid3.sourceforge.net //
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// //
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// extension.cache.dbm.php - part of getID3() //
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// Please see readme.txt for more information //
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// ///
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/////////////////////////////////////////////////////////////////
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// //
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// This extension written by Allan Hansen <ahØartemis*dk> //
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// ///
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/////////////////////////////////////////////////////////////////
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/**
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* This is a caching extension for getID3(). It works the exact same
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* way as the getID3 class, but return cached information very fast
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*
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* Example:
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*
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* Normal getID3 usage (example):
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*
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* require_once 'getid3/getid3.php';
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* $getID3 = new getID3;
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* $getID3->encoding = 'UTF-8';
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* $info1 = $getID3->analyze('file1.flac');
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* $info2 = $getID3->analyze('file2.wv');
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*
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* getID3_cached usage:
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*
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* require_once 'getid3/getid3.php';
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* require_once 'getid3/extension.cache.dbm.php';
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* $getID3 = new getID3_cached('db3', '/tmp/getid3_cache.dbm',
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* '/tmp/getid3_cache.lock');
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* $getID3->encoding = 'UTF-8';
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* $info1 = $getID3->analyze('file1.flac');
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* $info2 = $getID3->analyze('file2.wv');
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*
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*
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* Supported Cache Types
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*
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* SQL Databases: (use extension.cache.mysql)
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*
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* cache_type cache_options
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* -------------------------------------------------------------------
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* mysql host, database, username, password
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*
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*
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* DBM-Style Databases: (this extension)
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*
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* cache_type cache_options
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* -------------------------------------------------------------------
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* gdbm dbm_filename, lock_filename
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* ndbm dbm_filename, lock_filename
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* db2 dbm_filename, lock_filename
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* db3 dbm_filename, lock_filename
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* db4 dbm_filename, lock_filename (PHP5 required)
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*
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* PHP must have write access to both dbm_filename and lock_filename.
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*
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*
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* Recommended Cache Types
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*
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* Infrequent updates, many reads any DBM
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* Frequent updates mysql
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*/
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class getID3_cached_dbm extends getID3
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{
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/**
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* @var resource
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*/
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private $dba;
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/**
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* @var resource|bool
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*/
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private $lock;
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/**
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* @var string
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*/
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private $cache_type;
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/**
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* @var string
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*/
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private $dbm_filename;
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/**
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* @var string
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*/
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private $lock_filename;
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/**
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* constructor - see top of this file for cache type and cache_options
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*
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* @param string $cache_type
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* @param string $dbm_filename
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* @param string $lock_filename
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*
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* @throws Exception
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* @throws getid3_exception
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*/
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public function __construct($cache_type, $dbm_filename, $lock_filename) {
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// Check for dba extension
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if (!extension_loaded('dba')) {
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throw new Exception('PHP is not compiled with dba support, required to use DBM style cache.');
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}
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// Check for specific dba driver
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if (!function_exists('dba_handlers') || !in_array($cache_type, dba_handlers())) {
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throw new Exception('PHP is not compiled --with '.$cache_type.' support, required to use DBM style cache.');
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}
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// Store lock filename for cleanup operations
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$this->lock_filename = $lock_filename;
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// Create lock file if needed
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if (!file_exists($this->lock_filename)) {
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if (!touch($this->lock_filename)) {
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throw new Exception('failed to create lock file: '.$this->lock_filename);
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}
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}
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// Open lock file for writing with read/write mode (w+) to prevent truncation on BSD systems
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$this->lock = fopen($this->lock_filename, 'w+');
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if (!$this->lock) {
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throw new Exception('Cannot open lock file: '.$this->lock_filename);
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}
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// Acquire exclusive write lock to lock file
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if (!flock($this->lock, LOCK_EX)) {
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fclose($this->lock);
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throw new Exception('Cannot acquire lock: '.$this->lock_filename);
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}
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// Store connection parameters
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$this->cache_type = $cache_type;
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$this->dbm_filename = $dbm_filename;
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try {
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// Try to open existing DBM file
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$this->dba = dba_open($this->dbm_filename, 'w', $this->cache_type);
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// Create new DBM file if it didn't exist
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if (!$this->dba) {
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$this->dba = dba_open($this->dbm_filename, 'n', $this->cache_type);
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if (!$this->dba) {
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throw new Exception('failed to create dbm file: '.$this->dbm_filename);
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}
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// Insert getID3 version number
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dba_insert(getID3::VERSION, getID3::VERSION, $this->dba);
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}
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// Check version number and clear cache if changed
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if (dba_fetch(getID3::VERSION, $this->dba) != getID3::VERSION) {
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$this->clear_cache();
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}
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} catch (Exception $e) {
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$this->safe_close();
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throw $e;
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}
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// Register destructor
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register_shutdown_function(array($this, '__destruct'));
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parent::__construct();
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}
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/**
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* Destructor - ensure proper cleanup of resources
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*/
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public function __destruct() {
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$this->safe_close();
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}
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/**
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* Safely close all resources with error handling
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*/
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private function safe_close() {
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try {
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// Close DBM connection if open
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if (is_resource($this->dba)) {
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dba_close($this->dba);
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$this->dba = null;
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}
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// Release lock if acquired
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if (is_resource($this->lock)) {
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flock($this->lock, LOCK_UN);
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fclose($this->lock);
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$this->lock = null;
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}
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} catch (Exception $e) {
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error_log('getID3_cached_dbm cleanup error: ' . $e->getMessage());
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}
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}
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/**
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* Clear cache and recreate DBM file
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*
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* @throws Exception
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*/
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public function clear_cache() {
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$this->safe_close();
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// Create new dbm file
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$this->dba = dba_open($this->dbm_filename, 'n', $this->cache_type);
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if (!$this->dba) {
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throw new Exception('failed to clear cache/recreate dbm file: '.$this->dbm_filename);
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}
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// Insert getID3 version number
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dba_insert(getID3::VERSION, getID3::VERSION, $this->dba);
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// Re-register shutdown function
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register_shutdown_function(array($this, '__destruct'));
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}
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/**
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* Analyze file and cache results
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*
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* @param string $filename
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* @param int $filesize
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* @param string $original_filename
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* @param resource $fp
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*
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* @return mixed
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*/
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public function analyze($filename, $filesize=null, $original_filename='', $fp=null) {
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try {
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$key = null;
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if (file_exists($filename)) {
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// Calc key: filename::mod_time::size - should be unique
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$key = $filename.'::'.filemtime($filename).'::'.filesize($filename);
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// Lookup key in cache
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$result = dba_fetch($key, $this->dba);
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// Cache hit
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if ($result !== false) {
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return unserialize($result);
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}
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}
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// Cache miss - perform actual analysis
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$result = parent::analyze($filename, $filesize, $original_filename, $fp);
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// Store result in cache if key was generated
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if ($key !== null) {
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dba_replace($key, serialize($result), $this->dba);
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}
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return $result;
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} catch (Exception $e) {
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$this->safe_close();
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throw $e;
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}
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}
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}
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