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Rename 'kohana' to 'system' to conform to the Kohana filesystem layout. I'm comfortable with us not clearly drawing the distinction about the fact that it's Kohana.
This commit is contained in:
Bharat Mediratta
@@ -0,0 +1,257 @@
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<?php defined('SYSPATH') OR die('No direct access allowed.');
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/**
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* SQLite-based Cache driver.
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*
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* $Id: Sqlite.php 4046 2009-03-05 19:23:29Z Shadowhand $
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*
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* @package Cache
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* @author Kohana Team
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* @copyright (c) 2007-2008 Kohana Team
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* @license http://kohanaphp.com/license.html
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*/
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class Cache_Sqlite_Driver implements Cache_Driver {
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// SQLite database instance
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protected $db;
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// Database error messages
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protected $error;
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/**
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* Logs an SQLite error.
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*/
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protected static function log_error($code)
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{
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// Log an error
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Kohana::log('error', 'Cache: SQLite error: '.sqlite_error_string($error));
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}
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/**
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* Tests that the storage location is a directory and is writable.
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*/
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public function __construct($filename)
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{
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// Get the directory name
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$directory = str_replace('\\', '/', realpath(pathinfo($filename, PATHINFO_DIRNAME))).'/';
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// Set the filename from the real directory path
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$filename = $directory.basename($filename);
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// Make sure the cache directory is writable
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if ( ! is_dir($directory) OR ! is_writable($directory))
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throw new Kohana_Exception('cache.unwritable', $directory);
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// Make sure the cache database is writable
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if (is_file($filename) AND ! is_writable($filename))
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throw new Kohana_Exception('cache.unwritable', $filename);
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// Open up an instance of the database
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$this->db = new SQLiteDatabase($filename, '0666', $error);
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// Throw an exception if there's an error
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if ( ! empty($error))
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throw new Kohana_Exception('cache.driver_error', sqlite_error_string($error));
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$query = "SELECT name FROM sqlite_master WHERE type = 'table' AND name = 'caches'";
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$tables = $this->db->query($query, SQLITE_BOTH, $error);
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// Throw an exception if there's an error
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if ( ! empty($error))
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throw new Kohana_Exception('cache.driver_error', sqlite_error_string($error));
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if ($tables->numRows() == 0)
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{
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Kohana::log('error', 'Cache: Initializing new SQLite cache database');
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// Issue a CREATE TABLE command
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$this->db->unbufferedQuery(Kohana::config('cache_sqlite.schema'));
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}
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}
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/**
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* Checks if a cache id is already set.
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*
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* @param string cache id
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* @return boolean
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*/
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public function exists($id)
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{
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// Find the id that matches
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$query = "SELECT id FROM caches WHERE id = '$id'";
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return ($this->db->query($query)->numRows() > 0);
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}
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/**
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* Sets a cache item to the given data, tags, and lifetime.
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*
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* @param string cache id to set
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* @param string data in the cache
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* @param array cache tags
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* @param integer lifetime
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* @return bool
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*/
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public function set($id, $data, array $tags = NULL, $lifetime)
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{
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// Serialize and escape the data
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$data = sqlite_escape_string(serialize($data));
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if ( ! empty($tags))
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{
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// Escape the tags, adding brackets so the tag can be explicitly matched
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$tags = sqlite_escape_string('<'.implode('>,<', $tags).'>');
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}
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// Cache Sqlite driver expects unix timestamp
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if ($lifetime !== 0)
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{
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$lifetime += time();
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}
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$query = $this->exists($id)
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? "UPDATE caches SET tags = '$tags', expiration = '$lifetime', cache = '$data' WHERE id = '$id'"
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: "INSERT INTO caches VALUES('$id', '$tags', '$lifetime', '$data')";
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// Run the query
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$this->db->unbufferedQuery($query, SQLITE_BOTH, $error);
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if ( ! empty($error))
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{
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self::log_error($error);
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return FALSE;
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}
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else
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{
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return TRUE;
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}
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}
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/**
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* Finds an array of ids for a given tag.
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*
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* @param string tag name
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* @return array of ids that match the tag
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*/
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public function find($tag)
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{
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$query = "SELECT id,cache FROM caches WHERE tags LIKE '%<{$tag}>%'";
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$query = $this->db->query($query, SQLITE_BOTH, $error);
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// An array will always be returned
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$result = array();
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if ( ! empty($error))
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{
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self::log_error($error);
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}
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elseif ($query->numRows() > 0)
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{
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// Disable notices for unserializing
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$ER = error_reporting(~E_NOTICE);
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while ($row = $query->fetchObject())
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{
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// Add each cache to the array
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$result[$row->id] = unserialize($row->cache);
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}
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// Turn notices back on
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error_reporting($ER);
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}
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return $result;
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}
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/**
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* Fetches a cache item. This will delete the item if it is expired or if
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* the hash does not match the stored hash.
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*
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* @param string cache id
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* @return mixed|NULL
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*/
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public function get($id)
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{
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$query = "SELECT id, expiration, cache FROM caches WHERE id = '$id' LIMIT 0, 1";
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$query = $this->db->query($query, SQLITE_BOTH, $error);
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if ( ! empty($error))
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{
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self::log_error($error);
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}
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elseif ($cache = $query->fetchObject())
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{
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// Make sure the expiration is valid and that the hash matches
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if ($cache->expiration != 0 AND $cache->expiration <= time())
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{
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// Cache is not valid, delete it now
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$this->delete($cache->id);
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}
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else
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{
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// Disable notices for unserializing
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$ER = error_reporting(~E_NOTICE);
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// Return the valid cache data
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$data = $cache->cache;
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// Turn notices back on
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error_reporting($ER);
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}
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}
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// No valid cache found
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return NULL;
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}
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/**
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* Deletes a cache item by id or tag
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*
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* @param string cache id or tag, or TRUE for "all items"
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* @param bool delete a tag
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* @return bool
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*/
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public function delete($id, $tag = FALSE)
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{
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if ($id === TRUE)
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{
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// Delete all caches
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$where = '1';
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}
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elseif ($tag === TRUE)
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{
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// Delete by tag
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$where = "tags LIKE '%<{$id}>%'";
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}
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else
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{
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// Delete by id
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$where = "id = '$id'";
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}
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$this->db->unbufferedQuery('DELETE FROM caches WHERE '.$where, SQLITE_BOTH, $error);
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if ( ! empty($error))
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{
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self::log_error($error);
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return FALSE;
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}
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else
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{
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return TRUE;
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}
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}
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/**
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* Deletes all cache files that are older than the current time.
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*/
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public function delete_expired()
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{
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// Delete all expired caches
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$query = 'DELETE FROM caches WHERE expiration != 0 AND expiration <= '.time();
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$this->db->unbufferedQuery($query);
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return TRUE;
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}
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} // End Cache SQLite Driver
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