includes/cache.php
author Dan
Mon, 30 Nov 2009 22:35:14 -0500
changeset 1142 c522ea3871a3
parent 1081 745200a9cc2a
child 1227 bdac73ed481e
permissions -rw-r--r--
Merge from accidental split
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Copyright (C) 2006-2009 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * Framework for caching arbitrary data around the site.
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 * @package Enano
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 * @subpackage Core
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 * @author Dan Fuhry <dan@enanocms.org>
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 * @license GNU General Public License
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 */
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class CacheManager
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{
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  /**
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   * Fetch a cached piece of data.
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   * @param string Cache ID. The timestamp is checked automatically.
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   */
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  public function fetch($cache_id)
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  {
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    if ( !preg_match('/^[a-z0-9_]+$/', $cache_id) )
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    {
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      throw new Exception('Cache ID must be letters, numbers, and underscores.');
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    }
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    $cache_file = ENANO_ROOT . "/cache/cache_$cache_id.php";
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    if ( file_exists($cache_file) )
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    {
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      require($cache_file);
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      if ( isset($_cache_data) && isset($_cache_ttl) && isset($_cache_timestamp) )
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      {
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        $cache_expire = $_cache_timestamp + ( 60 * $_cache_ttl);
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        if ( $cache_expire >= time() || $_cache_ttl === -1 )
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        {
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          return $_cache_data;
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        }
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      }
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    }
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    return false;
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  }
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  /**
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   * Stores an array by var_export()ing it and saving it to disk.
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   * @param string Cache ID - human readable name for this store (letters, numbers, underscores)
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   * @param array Data to store
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   * @param int TTL for the cached array, in minutes. Defaults to 20. If set to -1, caches indefinitely.
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   * @return bool True on success, false on failure
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   */
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  public function store($cache_id, $data, $ttl = 20)
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  {
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    if ( getConfig('cache_thumbs') != '1' )
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    {
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      // caching disabled
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      return false;
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    }
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    if ( !preg_match('/^[a-z0-9_]+$/', $cache_id) )
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    {
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      throw new Exception('Cache ID must be letters, numbers, and underscores.');
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    }
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    if ( !is_int($ttl) )
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    {
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      throw new Exception('TTL must be an integer');
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    }
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    $cache_file = ENANO_ROOT . "/cache/cache_$cache_id.php";
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    if ( file_exists($cache_file) )
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    {
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      @unlink($cache_file);
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    }
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    $fh = @fopen($cache_file, 'w');
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    if ( !$fh )
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    {
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      throw new Exception('Failed to open file for writing.');
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    }
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    $exported = Language::var_export_string($data);
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    $now = time();
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    $content = <<<EOF
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<?php
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/**
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 * Automatically generated cache file.
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 * Do not edit this file as it will expire and be overwritten $ttl minutes from its creation.
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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 */
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\$_cache_ttl = $ttl;
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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    95
\$_cache_timestamp = $now;
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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\$_cache_data = $exported;
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EOF;
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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    fwrite($fh, $content);
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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    fclose($fh);
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935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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    return true;
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  }
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935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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  /**
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   * Deletes a cached item.
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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   * @param string Cache ID.
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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   * @return bool true on success or if item doesn't exist, false on failure
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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   */
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   110
  
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  public function purge($cache_id)
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  {
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    if ( !preg_match('/^[a-z0-9_]+$/', $cache_id) )
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    {
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      throw new Exception('Cache ID must be letters, numbers, and underscores.');
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    }
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    $cache_file = ENANO_ROOT . "/cache/cache_$cache_id.php";
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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    if ( file_exists($cache_file) )
935f3799b654 First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
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    {
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      if ( unlink($cache_file) )
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      {
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        return true;
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      }
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      return false;
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    }
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    return true;
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  }
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}
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   130