Source/carbon/database/Database_cache.php

   1 <?php
   2 /*------------------------------------------------------------
   3 *  CarbonPHP framework (C) Tom Bell
   4 *  http://tombell.org.uk
   5 *------------------------------------------------------------*/
   6
   7 if (!defined('CARBON_PATH'))
   8 {
   9         exit('Direct script access is not allowed.');
  10 }
  11
  12 class Carbon_Database_Cache
  13 {
  14         private $carbon;
  15
  16         public function __construct()
  17         {
  18                 $this->carbon =& get_instance();
  19                 $this->carbon->load->utility('filesystem');
  20         }
  21
  22         public function check_path($path = '')
  23         {
  24                 if ($path == '')
  25                 {
  26                         if ($this->carbon->db->cachedir == '')
  27                         {
  28                                 return $this->carbon->db->cache_off();
  29                         }
  30
  31                         $path = $this->carbon->db->cachedir;
  32                 }
  33
  34                 $path = preg_replace("/(.+?)\/*$/", "\\1/", $path);
  35
  36                 if (!is_dir($path) || !is_writable($path))
  37                 {
  38                         if ($this->carbon->db->db_debug)
  39                         {
  40                                 return $this->carbon->db->display_error('database_invalid_cache_path');
  41                         }
  42
  43                         return $this->carbon->db->cache_off();
  44                 }
  45
  46                 $this->cache->db->cachedir = $path;
  47
  48                 return true;
  49         }
  50
  51         public function read($sql)
  52         {
  53                 if (!$this->check_path())
  54                 {
  55                         return $this->carbon->db->cache_off();
  56                 }
  57
  58                 $uri = ($this->carbon->uri->get_segment(1) == false) ? 'default.' : $this->carbon->uri->get_segment(1) . '+';
  59                 $uri .= ($this->carbon->uri->get_segment(2) == false) ? 'index' : $this->carbon->uri->get_segment(2);
  60
  61                 $filepath = $uri . '/' . md5($sql);
  62
  63                 $cachedata = read_file($this->carbon->db->cachedir . $filepath);
  64
  65                 if ($cachedata === false)
  66                 {
  67                         return false;
  68                 }
  69
  70                 return unserialize($cachedata);
  71         }
  72
  73         public function write($sql, $object)
  74         {
  75                 if (!$this->check_path())
  76                 {
  77                         return $this->carbon->db->cache_off();
  78                 }
  79
  80                 $uri = ($this->carbon->uri->get_segment(1) == false) ? 'default.' : $this->carbon->uri->get_segment(1) . '+';
  81                 $uri .= ($this->carbon->uri->get_segment(2) == false) ? 'index' : $this->carbon->uri->get_segment(2);
  82
  83                 $dir_path = $this->carbon->db->cachedir . $uri . '/';
  84                 $filename = md5($sql);
  85
  86                 if (!@is_dir($dir_path))
  87                 {
  88                         if (!@mkdir($dir_path, 0777))
  89                         {
  90                                 return false;
  91                         }
  92
  93                         @chmod($dir_path, 0777);
  94                 }
  95
  96                 if (write_file($dir_path . $filename, serialize($object)) === false)
  97                 {
  98                         return false;
  99                 }
 100
 101                 @chmod($dir_path, $filename, 0777);
 102
 103                 return true;
 104         }
 105
 106         public function delete($segment_one = '', $segment_two = '')
 107         {
 108                 if ($segment_one == '')
 109                 {
 110                         $segment_one = ($this->carbon->uri->get_segment(1) == false) ? 'default' : $this->carbon->uri->get_segment(2);
 111                 }
 112
 113                 if ($segment_two == '')
 114                 {
 115                         $segment_two = ($this->carbon->uri->get_segment(2) == false) ? 'index' : $this->carbon->uri->get_segment(2);
 116                 }
 117
 118                 $dir_path = $this->carbon->db->cachedir . $segment_one . '+' . $segment_two . '/';
 119
 120                 delete_files($dir_path, true);
 121         }
 122
 123         public function delete_all()
 124         {
 125                 delete_files($this->carbon->db->cachedir, true);
 126         }
 127 }
 128
 129 ?>