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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: CacheFile.class.php 2791 2012-02-29 10:08:57Z liu21st $
/**
+------------------------------------------------------------------------------
* 文件类型缓存类
+------------------------------------------------------------------------------
* @category Think
* @package Think
* @subpackage Util
* @author liu21st <liu21st@gmail.com>
* @version $Id: CacheFile.class.php 2791 2012-02-29 10:08:57Z liu21st $
+------------------------------------------------------------------------------
*/
class CacheFile extends Cache {
/**
+----------------------------------------------------------
* 缓存存储前缀
+----------------------------------------------------------
* @var string
* @access protected
+----------------------------------------------------------
*/
protected $prefix='~@';
/**
+----------------------------------------------------------
* 架构函数
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __construct($options='') {
if(!empty($options)) {
$this->options = $options;
}
$this->options['temp'] = !empty($options['temp'])?$options['temp']:C('DATA_CACHE_PATH');
$this->options['expire'] = isset($options['expire'])?$options['expire']:C('DATA_CACHE_TIME');
$this->options['length'] = isset($options['length'])?$options['length']:0;
if(substr($this->options['temp'], -1) != '/') $this->options['temp'] .= '/';
$this->connected = is_dir($this->options['temp']) && is_writeable($this->options['temp']);
$this->init();
}
/**
+----------------------------------------------------------
* 初始化检查
+----------------------------------------------------------
* @access private
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
private function init() {
$stat = stat($this->options['temp']);
$dir_perms = $stat['mode'] & 0007777; // Get the permission bits.
$file_perms = $dir_perms & 0000666; // Remove execute bits for files.
// 创建项目缓存目录
if (!is_dir($this->options['temp'])) {
if (! mkdir($this->options['temp']))
return false;
chmod($this->options['temp'], $dir_perms);
}
}
/**
+----------------------------------------------------------
* 是否连接
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
private function isConnected() {
return $this->connected;
}
/**
+----------------------------------------------------------
* 取得变量的存储文件名
+----------------------------------------------------------
* @access private
+----------------------------------------------------------
* @param string $name 缓存变量名
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
private function filename($name) {
$name = md5($name);
if(C('DATA_CACHE_SUBDIR')) {
// 使用子目录
$dir ='';
for($i=0;$i<C('DATA_PATH_LEVEL');$i++) {
$dir .= $name{$i}.'/';
}
if(!is_dir($this->options['temp'].$dir)) {
mk_dir($this->options['temp'].$dir);
}
$filename = $dir.$this->prefix.$name.'.php';
}else{
$filename = $this->prefix.$name.'.php';
}
return $this->options['temp'].$filename;
}
/**
+----------------------------------------------------------
* 读取缓存
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $name 缓存变量名
+----------------------------------------------------------
* @return mixed
+----------------------------------------------------------
*/
public function get($name) {
$filename = $this->filename($name);
if (!$this->isConnected() || !is_file($filename)) {
return false;
}
N('cache_read',1);
$content = file_get_contents($filename);
if( false !== $content) {
$expire = (int)substr($content,8, 12);
if($expire != 0 && time() > filemtime($filename) + $expire) {
//缓存过期删除缓存文件
unlink($filename);
return false;
}
if(C('DATA_CACHE_CHECK')) {//开启数据校验
$check = substr($content,20, 32);
$content = substr($content,52, -3);
if($check != md5($content)) {//校验错误
return false;
}
}else {
$content = substr($content,20, -3);
}
if(C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
//启用数据压缩
$content = gzuncompress($content);
}
$content = unserialize($content);
return $content;
}
else {
return false;
}
}
/**
+----------------------------------------------------------
* 写入缓存
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $name 缓存变量名
* @param mixed $value 存储数据
* @param int $expire 有效时间 0为永久
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function set($name,$value,$expire=null) {
N('cache_write',1);
if(is_null($expire)) {
$expire = $this->options['expire'];
}
$filename = $this->filename($name);
$data = serialize($value);
if( C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
//数据压缩
$data = gzcompress($data,3);
}
if(C('DATA_CACHE_CHECK')) {//开启数据校验
$check = md5($data);
}else {
$check = '';
}
$data = "<?php\n//".sprintf('%012d',$expire).$check.$data."\n?>";
$result = file_put_contents($filename,$data);
if($result) {
if($this->options['length']>0) {
// 记录缓存队列
$this->queue($name);
}
clearstatcache();
return true;
}else {
return false;
}
}
/**
+----------------------------------------------------------
* 删除缓存
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $name 缓存变量名
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function rm($name) {
return unlink($this->filename($name));
}
/**
+----------------------------------------------------------
* 清除缓存
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $name 缓存变量名
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function clear() {
$path = $this->options['temp'];
if ( $dir = opendir( $path ) ) {
while ( $file = readdir( $dir ) ) {
$check = is_dir( $file );
if ( !$check )
unlink( $path . $file );
}
closedir( $dir );
return true;
}
}
}
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