- Timestamp:
- Jul 7, 2009, 10:27:37 PM (15 years ago)
- File:
-
- 1 edited
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- Unmodified
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extensions/charlies_content/getid3/getid3/extension.cache.dbm.php
r3318 r3544 1 1 <?php 2 // +----------------------------------------------------------------------+ 3 // | PHP version 5 | 4 // +----------------------------------------------------------------------+ 5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | 6 // +----------------------------------------------------------------------+ 7 // | This source file is subject to version 2 of the GPL license, | 8 // | that is bundled with this package in the file license.txt and is | 9 // | available through the world-wide-web at the following url: | 10 // | http://www.gnu.org/copyleft/gpl.html | 11 // +----------------------------------------------------------------------+ 12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | 13 // +----------------------------------------------------------------------+ 14 // | Authors: James Heinrich <infoØgetid3*org> | 15 // | Allan Hansen <ahØartemis*dk> | 16 // +----------------------------------------------------------------------+ 17 // | extension.cache.mysql.php | 18 // | MySQL Cache Extension. | 19 // | dependencies: getid3. | 20 // +----------------------------------------------------------------------+ 21 // 22 // $Id$ 2 ///////////////////////////////////////////////////////////////// 3 /// getID3() by James Heinrich <info@getid3.org> // 4 // available at http://getid3.sourceforge.net // 5 // or http://www.getid3.org // 6 ///////////////////////////////////////////////////////////////// 7 // // 8 // extension.cache.dbm.php - part of getID3() // 9 // Please see readme.txt for more information // 10 // /// 11 ///////////////////////////////////////////////////////////////// 12 // // 13 // This extension written by Allan Hansen <ahØartemis*dk> // 14 // /// 15 ///////////////////////////////////////////////////////////////// 23 16 24 17 … … 27 20 * way as the getID3 class, but return cached information very fast 28 21 * 29 * Example: (see also demo.cache.dbm.php in /demo/)22 * Example: 30 23 * 31 24 * Normal getID3 usage (example): 32 25 * 33 26 * require_once 'getid3/getid3.php'; 34 * $getid3 = new getid3; 35 * $getid3->encoding = 'UTF-8'; 36 * try { 37 * $info1 = $getid3->Analyse('file1.flac'); 38 * $info2 = $getid3->Analyse('file2.wv'); 39 * .... 27 * $getID3 = new getID3; 28 * $getID3->encoding = 'UTF-8'; 29 * $info1 = $getID3->analyze('file1.flac'); 30 * $info2 = $getID3->analyze('file2.wv'); 40 31 * 41 32 * getID3_cached usage: 42 33 * 43 34 * require_once 'getid3/getid3.php'; 44 * require_once 'getid3/getid3/extension.cache.mysql.php'; 45 * $getid3 = new getid3_cached_mysql('localhost', 'database', 'username', 'password'); 46 * $getid3->encoding = 'UTF-8'; 47 * try { 48 * $info1 = $getid3->analyse('file1.flac'); 49 * $info2 = $getid3->analyse('file2.wv'); 50 * ... 35 * require_once 'getid3/getid3/extension.cache.dbm.php'; 36 * $getID3 = new getID3_cached('db3', '/tmp/getid3_cache.dbm', 37 * '/tmp/getid3_cache.lock'); 38 * $getID3->encoding = 'UTF-8'; 39 * $info1 = $getID3->analyze('file1.flac'); 40 * $info2 = $getID3->analyze('file2.wv'); 51 41 * 52 42 * … … 80 70 81 71 82 class get id3_cached_dbm extends getid372 class getID3_cached_dbm extends getID3 83 73 { 84 74 85 public function __construct($cache_type, $dbm_filename, $lock_filename) { 86 87 // Check for dba extension 88 if (!extension_loaded('dba')) { 89 throw new getid3_exception('PHP is not compiled with dba support, required to use DBM style cache.'); 90 } 91 92 if (!in_array($cache_type, dba_handlers())) { 93 throw new getid3_exception('PHP is not compiled --with '.$cache_type.' support, required to use DBM style cache.'); 94 } 95 96 // Create lock file if needed 97 if (!file_exists($lock_filename)) { 98 if (!touch($lock_filename)) { 99 die('failed to create lock file: ' . $lock_filename); 100 } 101 } 102 103 // Open lock file for writing 104 if (!is_writeable($lock_filename)) { 105 die('lock file: ' . $lock_filename . ' is not writable'); 106 } 107 $this->lock = fopen($lock_filename, 'w'); 108 109 // Acquire exclusive write lock to lock file 110 flock($this->lock, LOCK_EX); 111 112 // Create dbm-file if needed 113 if (!file_exists($dbm_filename)) { 114 if (!touch($dbm_filename)) { 115 die('failed to create dbm file: ' . $dbm_filename); 116 } 117 } 118 119 // Try to open dbm file for writing 120 $this->dba = @dba_open($dbm_filename, 'w', $cache_type); 121 if (!$this->dba) { 122 123 // Failed - create new dbm file 124 $this->dba = dba_open($dbm_filename, 'n', $cache_type); 125 126 if (!$this->dba) { 127 die('failed to create dbm file: ' . $dbm_filename); 128 } 129 130 // Insert getID3 version number 131 dba_insert(getid3::VERSION, getid3::VERSION, $this->dba); 132 } 133 134 // Init misc values 135 $this->cache_type = $cache_type; 136 $this->dbm_filename = $dbm_filename; 137 138 // Register destructor 139 register_shutdown_function(array($this, '__destruct')); 140 141 // Check version number and clear cache if changed 142 if (dba_fetch(getid3::VERSION, $this->dba) != getid3::VERSION) { 143 $this->clear_cache(); 144 } 145 146 parent::__construct(); 147 } 148 149 150 151 public function __destruct() { 152 153 // Close dbm file 154 @dba_close($this->dba); 155 156 // Release exclusive lock 157 @flock($this->lock, LOCK_UN); 158 159 // Close lock file 160 @fclose($this->lock); 161 } 162 163 164 165 public function clear_cache() { 166 167 // Close dbm file 168 dba_close($this->dba); 169 170 // Create new dbm file 171 $this->dba = dba_open($this->dbm_filename, 'n', $this->cache_type); 172 173 if (!$this->dba) { 174 die('failed to clear cache/recreate dbm file: ' . $this->dbm_filename); 175 } 176 177 // Insert getID3 version number 178 dba_insert(getid3::VERSION, getid3::VERSION, $this->dba); 179 180 // Reregister shutdown function 181 register_shutdown_function(array($this, '__destruct')); 182 } 183 184 185 186 // public: analyze file 187 public function Analyze($filename) { 188 189 if (file_exists($filename)) { 190 191 // Calc key filename::mod_time::size - should be unique 192 $key = $filename . '::' . filemtime($filename) . '::' . filesize($filename); 193 194 // Loopup key 195 $result = dba_fetch($key, $this->dba); 196 197 // Hit 198 if ($result !== false) { 199 return unserialize($result); 200 } 201 } 202 203 // Miss 204 $result = parent::Analyze($filename); 205 206 // Save result 207 if (file_exists($filename)) { 208 dba_insert($key, serialize($result), $this->dba); 209 } 210 211 return $result; 212 } 75 // public: constructor - see top of this file for cache type and cache_options 76 function getID3_cached_dbm($cache_type, $dbm_filename, $lock_filename) { 77 78 // Check for dba extension 79 if (!extension_loaded('dba')) { 80 die('PHP is not compiled with dba support, required to use DBM style cache.'); 81 } 82 83 // Check for specific dba driver 84 if (function_exists('dba_handlers')) { // PHP 4.3.0+ 85 if (!in_array('db3', dba_handlers())) { 86 die('PHP is not compiled --with '.$cache_type.' support, required to use DBM style cache.'); 87 } 88 } 89 else { // PHP <= 4.2.3 90 ob_start(); // nasty, buy the only way to check... 91 phpinfo(); 92 $contents = ob_get_contents(); 93 ob_end_clean(); 94 if (!strstr($contents, $cache_type)) { 95 die('PHP is not compiled --with '.$cache_type.' support, required to use DBM style cache.'); 96 } 97 } 98 99 // Create lock file if needed 100 if (!file_exists($lock_filename)) { 101 if (!touch($lock_filename)) { 102 die('failed to create lock file: ' . $lock_filename); 103 } 104 } 105 106 // Open lock file for writing 107 if (!is_writeable($lock_filename)) { 108 die('lock file: ' . $lock_filename . ' is not writable'); 109 } 110 $this->lock = fopen($lock_filename, 'w'); 111 112 // Acquire exclusive write lock to lock file 113 flock($this->lock, LOCK_EX); 114 115 // Create dbm-file if needed 116 if (!file_exists($dbm_filename)) { 117 if (!touch($dbm_filename)) { 118 die('failed to create dbm file: ' . $dbm_filename); 119 } 120 } 121 122 // Try to open dbm file for writing 123 $this->dba = @dba_open($dbm_filename, 'w', $cache_type); 124 if (!$this->dba) { 125 126 // Failed - create new dbm file 127 $this->dba = dba_open($dbm_filename, 'n', $cache_type); 128 129 if (!$this->dba) { 130 die('failed to create dbm file: ' . $dbm_filename); 131 } 132 133 // Insert getID3 version number 134 dba_insert(GETID3_VERSION, GETID3_VERSION, $this->dba); 135 } 136 137 // Init misc values 138 $this->cache_type = $cache_type; 139 $this->dbm_filename = $dbm_filename; 140 141 // Register destructor 142 register_shutdown_function(array($this, '__destruct')); 143 144 // Check version number and clear cache if changed 145 if (dba_fetch(GETID3_VERSION, $this->dba) != GETID3_VERSION) { 146 $this->clear_cache(); 147 } 148 149 parent::getID3(); 150 } 151 152 153 154 // public: destuctor 155 function __destruct() { 156 157 // Close dbm file 158 @dba_close($this->dba); 159 160 // Release exclusive lock 161 @flock($this->lock, LOCK_UN); 162 163 // Close lock file 164 @fclose($this->lock); 165 } 166 167 168 169 // public: clear cache 170 function clear_cache() { 171 172 // Close dbm file 173 dba_close($this->dba); 174 175 // Create new dbm file 176 $this->dba = dba_open($this->dbm_filename, 'n', $this->cache_type); 177 178 if (!$this->dba) { 179 die('failed to clear cache/recreate dbm file: ' . $this->dbm_filename); 180 } 181 182 // Insert getID3 version number 183 dba_insert(GETID3_VERSION, GETID3_VERSION, $this->dba); 184 185 // Reregister shutdown function 186 register_shutdown_function(array($this, '__destruct')); 187 } 188 189 190 191 // public: analyze file 192 function analyze($filename) { 193 194 if (file_exists($filename)) { 195 196 // Calc key filename::mod_time::size - should be unique 197 $key = $filename . '::' . filemtime($filename) . '::' . filesize($filename); 198 199 // Loopup key 200 $result = dba_fetch($key, $this->dba); 201 202 // Hit 203 if ($result !== false) { 204 return unserialize($result); 205 } 206 } 207 208 // Miss 209 $result = parent::analyze($filename); 210 211 // Save result 212 if (file_exists($filename)) { 213 dba_insert($key, serialize($result), $this->dba); 214 } 215 216 return $result; 217 } 213 218 214 219 }
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