WIBUHAX0R1337

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<?php
/*
 * Copyright 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

if (!class_exists('UDP_Google_Client')) {
  require_once dirname(__FILE__) . '/../autoload.php';
}

/*
 * This class implements a basic on disk storage. While that does
 * work quite well it's not the most elegant and scalable solution.
 * It will also get you into a heap of trouble when you try to run
 * this in a clustered environment.
 *
 * @author Chris Chabot <chabotc@google.com>
 */
class Google_Cache_File extends Google_Cache_Abstract
{
  const MAX_LOCK_RETRIES = 10;
  private $path;
  private $fh;

/**
   * @var Google_Client the current client
   */
  private $client;

public function __construct(UDP_Google_Client $client)
  {
    $this->client = $client;
    $this->path = $this->client->getClassConfig($this, 'directory');
  }

public function get($key, $expiration = false)
  {
    $storageFile = $this->getCacheFile($key);
    $data = false;

if (!file_exists($storageFile)) {
      $this->client->getLogger()->debug(
          'File cache miss',
          array('key' => $key, 'file' => $storageFile)
      );
      return false;
    }

if ($expiration) {
      $mtime = filemtime($storageFile);
      if ((time() - $mtime) >= $expiration) {
        $this->client->getLogger()->debug(
            'File cache miss (expired)',
            array('key' => $key, 'file' => $storageFile)
        );
        $this->delete($key);
        return false;
      }
    }

if ($this->acquireReadLock($storageFile)) {
      if (filesize($storageFile) > 0) {
        $data = fread($this->fh, filesize($storageFile));
        $data =  unserialize($data);
      } else {
        $this->client->getLogger()->debug(
            'Cache file was empty',
            array('file' => $storageFile)
        );
      }
      $this->unlock($storageFile);
    }

$this->client->getLogger()->debug(
        'File cache hit',
        array('key' => $key, 'file' => $storageFile, 'var' => $data)
    );

return $data;
  }

public function set($key, $value)
  {
    $storageFile = $this->getWriteableCacheFile($key);
    if ($this->acquireWriteLock($storageFile)) {
      // We serialize the whole request object, since we don't only want the
      // responseContent but also the postBody used, headers, size, etc.
      $data = serialize($value);
      $result = fwrite($this->fh, $data);
      $this->unlock($storageFile);

$this->client->getLogger()->debug(
          'File cache set',
          array('key' => $key, 'file' => $storageFile, 'var' => $value)
      );
    } else {
      $this->client->getLogger()->notice(
          'File cache set failed',
          array('key' => $key, 'file' => $storageFile)
      );
    }
  }

public function delete($key)
  {
    $file = $this->getCacheFile($key);
    if (file_exists($file) && !unlink($file)) {
      $this->client->getLogger()->error(
          'File cache delete failed',
          array('key' => $key, 'file' => $file)
      );
      throw new Google_Cache_Exception("Cache file could not be deleted");
    }

$this->client->getLogger()->debug(
        'File cache delete',
        array('key' => $key, 'file' => $file)
    );
  }

private function getWriteableCacheFile($file)
  {
    return $this->getCacheFile($file, true);
  }

private function getCacheFile($file, $forWrite = false)
  {
    return $this->getCacheDir($file, $forWrite) . '/' . md5($file);
  }

private function getCacheDir($file, $forWrite)
  {
    // use the first 2 characters of the hash as a directory prefix
    // this should prevent slowdowns due to huge directory listings
    // and thus give some basic amount of scalability
    $storageDir = $this->path . '/' . substr(md5($file), 0, 2);
    if ($forWrite && ! is_dir($storageDir)) {
      if (! mkdir($storageDir, 0755, true)) {
        $this->client->getLogger()->error(
            'File cache creation failed',
            array('dir' => $storageDir)
        );
        throw new Google_Cache_Exception("Could not create storage directory: $storageDir"); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
      }
    }
    return $storageDir;
  }

private function acquireReadLock($storageFile)
  {
    return $this->acquireLock(LOCK_SH, $storageFile);
  }

private function acquireWriteLock($storageFile)
  {
    $rc = $this->acquireLock(LOCK_EX, $storageFile);
    if (!$rc) {
      $this->client->getLogger()->notice(
          'File cache write lock failed',
          array('file' => $storageFile)
      );
      $this->delete($storageFile);
    }
    return $rc;
  }

private function acquireLock($type, $storageFile)
  {
    $mode = $type == LOCK_EX ? "w" : "r";
    $this->fh = fopen($storageFile, $mode);
    if (!$this->fh) {
      $this->client->getLogger()->error(
          'Failed to open file during lock acquisition',
          array('file' => $storageFile)
      );
      return false;
    }
    $count = 0;
    while (!flock($this->fh, $type | LOCK_NB)) {
      // Sleep for 10ms.
      usleep(10000);
      if (++$count < self::MAX_LOCK_RETRIES) {
        return false;
      }
    }
    return true;
  }

public function unlock($storageFile)
  {
    if ($this->fh) {
      flock($this->fh, LOCK_UN);
    }
  }
}

Nama File / Folder	Size	Action
Apc.php	2.886KB	Edit File Delete File Rename
File.php	5.716KB	Edit File Delete File Rename
Memcache.php	5.076KB	Edit File Delete File Rename
Null.php	1.173KB	Edit File Delete File Rename