| 135 | | // If caching is not enabled, we have to fall back to pulling from the DB. |
| 136 | | if (!$this->cache_enabled) { |
| 137 | | if (!isset ($this->cache[$group])) |
| 138 | | $this->load_group_from_db($group); |
| 139 | | |
| 140 | | if (isset ($this->cache[$group][$id])) { |
| 141 | | $this->cold_cache_hits += 1; |
| 142 | | return $this->cache[$group][$id]; |
| 143 | | } |
| 144 | | |
| 145 | | $this->non_existant_objects[$group][$id] = true; |
| 146 | | $this->cache_misses += 1; |
| 147 | | return false; |
| 148 | | } |
| 149 | | |
| 150 | | $cache_file = $this->cache_dir.$this->get_group_dir($group)."/".$this->hash($id).'.php'; |
| 151 | | if (!file_exists($cache_file)) { |
| 152 | | $this->non_existant_objects[$group][$id] = true; |
| 153 | | $this->cache_misses += 1; |
| 154 | | return false; |
| 155 | | } |
| 156 | | |
| 157 | | // If the object has expired, remove it from the cache and return false to force |
| 158 | | // a refresh. |
| 159 | | $now = time(); |
| 160 | | if ((filemtime($cache_file) + $this->expiration_time) <= $now) { |
| 161 | | $this->cache_misses += 1; |
| 162 | | $this->delete($id, $group, true); |
| 163 | | return false; |
| 164 | | } |
| 165 | | |
| 166 | | $this->cache[$group][$id] = unserialize(base64_decode(substr(@ file_get_contents($cache_file), strlen(CACHE_SERIAL_HEADER), -strlen(CACHE_SERIAL_FOOTER)))); |
| 167 | | if (false === $this->cache[$group][$id]) |
| 168 | | $this->cache[$group][$id] = ''; |
| 169 | | |
| 170 | | $this->cold_cache_hits += 1; |
| 171 | | return $this->cache[$group][$id]; |
| | 97 | $this->non_existant_objects[$group][$id] = true; |
| | 98 | $this->cache_misses += 1; |
| | 99 | return false; |
| 174 | | function get_group_dir($group) { |
| 175 | | if (false !== array_search($group, $this->global_groups)) |
| 176 | | return $group; |
| 177 | | |
| 178 | | return "{$this->blog_id}/$group"; |
| 179 | | } |
| 180 | | |
| 181 | | function hash($data) { |
| 182 | | if ( function_exists('hash_hmac') ) { |
| 183 | | return hash_hmac('md5', $data, $this->secret); |
| 184 | | } else { |
| 185 | | return md5($data . $this->secret); |
| 186 | | } |
| 187 | | } |
| 188 | | |
| 189 | | function load_group_from_db($group) { |
| 190 | | return; |
| 191 | | } |
| 192 | | |
| 193 | | function make_group_dir($group, $perms) { |
| 194 | | $group_dir = $this->get_group_dir($group); |
| 195 | | $make_dir = ''; |
| 196 | | foreach (split('/', $group_dir) as $subdir) { |
| 197 | | $make_dir .= "$subdir/"; |
| 198 | | if (!file_exists($this->cache_dir.$make_dir)) { |
| 199 | | if (! @ mkdir($this->cache_dir.$make_dir)) |
| 200 | | break; |
| 201 | | @ chmod($this->cache_dir.$make_dir, $perms); |
| 202 | | } |
| 203 | | |
| 204 | | if (!file_exists($this->cache_dir.$make_dir."index.php")) { |
| 205 | | $file_perms = $perms & 0000666; |
| 206 | | @ touch($this->cache_dir.$make_dir."index.php"); |
| 207 | | @ chmod($this->cache_dir.$make_dir."index.php", $file_perms); |
| 208 | | } |
| 209 | | } |
| 210 | | |
| 211 | | return $this->cache_dir."$group_dir/"; |
| 212 | | } |
| 213 | | |
| 214 | | function rm_cache_dir() { |
| 215 | | $dir = $this->cache_dir; |
| 216 | | $dir = rtrim($dir, DIRECTORY_SEPARATOR); |
| 217 | | $top_dir = $dir; |
| 218 | | $stack = array($dir); |
| 219 | | $index = 0; |
| 220 | | |
| 221 | | while ($index < count($stack)) { |
| 222 | | # Get indexed directory from stack |
| 223 | | $dir = $stack[$index]; |
| 224 | | |
| 225 | | $dh = @ opendir($dir); |
| 226 | | if (!$dh) |
| 227 | | return false; |
| 228 | | |
| 229 | | while (($file = @ readdir($dh)) !== false) { |
| 230 | | if ($file == '.' or $file == '..') |
| 231 | | continue; |
| 232 | | |
| 233 | | if (@ is_dir($dir . DIRECTORY_SEPARATOR . $file)) |
| 234 | | $stack[] = $dir . DIRECTORY_SEPARATOR . $file; |
| 235 | | else if (@ is_file($dir . DIRECTORY_SEPARATOR . $file)) |
| 236 | | @ unlink($dir . DIRECTORY_SEPARATOR . $file); |
| 237 | | } |
| 238 | | |
| 239 | | $index++; |
| 240 | | } |
| 241 | | |
| 242 | | $stack = array_reverse($stack); // Last added dirs are deepest |
| 243 | | foreach($stack as $dir) { |
| 244 | | if ( $dir != $top_dir) |
| 245 | | @ rmdir($dir); |
| 246 | | } |
| 247 | | |
| 248 | | } |
| 249 | | |
| 250 | | function release_lock() { |
| 251 | | // Release write lock. |
| 252 | | flock($this->mutex, LOCK_UN); |
| 253 | | fclose($this->mutex); |
| 254 | | } |
| 255 | | |
| 280 | | function save() { |
| 281 | | //$this->stats(); |
| 282 | | |
| 283 | | if (!$this->cache_enabled) |
| 284 | | return true; |
| 285 | | |
| 286 | | if (empty ($this->dirty_objects)) |
| 287 | | return true; |
| 288 | | |
| 289 | | // Give the new dirs the same perms as wp-content. |
| 290 | | $stat = stat(ABSPATH.'wp-content'); |
| 291 | | $dir_perms = $stat['mode'] & 0007777; // Get the permission bits. |
| 292 | | $file_perms = $dir_perms & 0000666; // Remove execute bits for files. |
| 293 | | |
| 294 | | // Make the base cache dir. |
| 295 | | if (!file_exists($this->cache_dir)) { |
| 296 | | if (! @ mkdir($this->cache_dir)) |
| 297 | | return false; |
| 298 | | @ chmod($this->cache_dir, $dir_perms); |
| 299 | | } |
| 300 | | |
| 301 | | if (!file_exists($this->cache_dir."index.php")) { |
| 302 | | @ touch($this->cache_dir."index.php"); |
| 303 | | @ chmod($this->cache_dir."index.php", $file_perms); |
| 304 | | } |
| 305 | | |
| 306 | | if ( ! $this->acquire_lock() ) |
| 307 | | return false; |
| 308 | | |
| 309 | | // Loop over dirty objects and save them. |
| 310 | | $errors = 0; |
| 311 | | foreach ($this->dirty_objects as $group => $ids) { |
| 312 | | if ( in_array($group, $this->non_persistent_groups) ) |
| 313 | | continue; |
| 314 | | |
| 315 | | $group_dir = $this->make_group_dir($group, $dir_perms); |
| 316 | | |
| 317 | | $ids = array_unique($ids); |
| 318 | | foreach ($ids as $id) { |
| 319 | | $cache_file = $group_dir.$this->hash($id).'.php'; |
| 320 | | |
| 321 | | // Remove the cache file if the key is not set. |
| 322 | | if (!isset ($this->cache[$group][$id])) { |
| 323 | | if (file_exists($cache_file)) |
| 324 | | @ unlink($cache_file); |
| 325 | | continue; |
| 326 | | } |
| 327 | | |
| 328 | | $temp_file = tempnam($group_dir, 'tmp'); |
| 329 | | $serial = CACHE_SERIAL_HEADER.base64_encode(serialize($this->cache[$group][$id])).CACHE_SERIAL_FOOTER; |
| 330 | | $fd = @fopen($temp_file, 'w'); |
| 331 | | if ( false === $fd ) { |
| 332 | | $errors++; |
| 333 | | continue; |
| 334 | | } |
| 335 | | fputs($fd, $serial); |
| 336 | | fclose($fd); |
| 337 | | if (!@ rename($temp_file, $cache_file)) { |
| 338 | | if (!@ copy($temp_file, $cache_file)) |
| 339 | | $errors++; |
| 340 | | @ unlink($temp_file); |
| 341 | | } |
| 342 | | @ chmod($cache_file, $file_perms); |
| 343 | | } |
| 344 | | } |
| 345 | | |
| 346 | | $this->dirty_objects = array(); |
| 347 | | |
| 348 | | $this->release_lock(); |
| 349 | | |
| 350 | | if ( $errors ) |
| 351 | | return false; |
| 352 | | |
| 353 | | return true; |
| 354 | | } |
| 355 | | |
| 388 | | |
| 389 | | if (defined('DISABLE_CACHE')) |
| 390 | | return; |
| 391 | | |
| 392 | | if ( ! defined('ENABLE_CACHE') ) |
| 393 | | return; |
| 394 | | |
| 395 | | // Disable the persistent cache if safe_mode is on. |
| 396 | | if ( ini_get('safe_mode') && ! defined('ENABLE_CACHE') ) |
| 397 | | return; |
| 398 | | |
| 399 | | if (defined('CACHE_PATH')) |
| 400 | | $this->cache_dir = CACHE_PATH; |
| 401 | | else |
| 402 | | // Using the correct separator eliminates some cache flush errors on Windows |
| 403 | | $this->cache_dir = ABSPATH.'wp-content'.DIRECTORY_SEPARATOR.'cache'.DIRECTORY_SEPARATOR; |
| 404 | | |
| 405 | | if (is_writable($this->cache_dir) && is_dir($this->cache_dir)) { |
| 406 | | $this->cache_enabled = true; |
| 407 | | } else { |
| 408 | | if (is_writable(ABSPATH.'wp-content')) { |
| 409 | | $this->cache_enabled = true; |
| 410 | | } |
| 411 | | } |
| 412 | | |
| 413 | | if (defined('CACHE_EXPIRATION_TIME')) |
| 414 | | $this->expiration_time = CACHE_EXPIRATION_TIME; |
| 415 | | |
| 416 | | if ( defined('WP_SECRET') ) |
| 417 | | $this->secret = WP_SECRET; |
| 418 | | else |
| 419 | | $this->secret = DB_PASSWORD . DB_USER . DB_NAME . DB_HOST . ABSPATH; |
| 420 | | |
| 421 | | $this->blog_id = $this->hash($blog_id); |