批量清除nginx缓存的方法

我公司的一个客户在国外访问测试网站比较麻烦，因此我在一台机器上安装了一个nginx，并且使用nginx的proxy_cache模块做缓存服务器，由于由于修改比较多，每次使用ngx_cache_purge清除cache只能清除几个url，没有很好的办法去清除某个目录的缓存。我研究了nginx的缓存文件格式，发现可以从中提取出url出来，如下图所示，url是以"KEY:"开头以0x0A结尾

我写了一个程序能够实现

1.提交一批url进行清除对应的cache

2.提交一批url目录可以清除包含这些目录的url，若是提交域名可以清除整站

3.查看某个目录下的缓存文件是否缓存上

4.可以添加多个站点

需要县安装ngx_cache_purge

代码如下

 

/*
 * 作者:yifangyou
   日期:2012-07-21 14:43:00
   功能:按照多个目录或者多个URL的方式，清除nginx的cache，或者查看nginx cache 缓存
   要求:nginx + ngx_cache_purge
 */
   //代理服务器的ip
  $proxyIp="127.0.0.1";
  //代理服务器端口
    $proxyPort=80;
    //代理服务器的缓存目录
    $cacheDir="/opt/proxy_cache_dir/";
    $proxySites=array(
    //用户访问的域名 => 被代理的实际网站的域名，若是都是80的话就是一样即可
     "http://www.test.com"=>"http://www.test.com"
    );
//输出文件
$output="";
$result=array();
$filedirs = array();
//只查看缓存文件，不清除
if($_POST["view"]){
         $accessSite=$_POST["accessSite"];
     $proxySite=$proxySites[$accessSite];
         $clearUrls=array();
         $clearUrls=explode ("\n",$_POST["dirs"]);
         if($$proxySite){
                 foreach($ds as $d){
                         $d=str_replace($accessSite, $proxySite,$d);
                         $clearUrls[]=$d;
                 }
         }
         scan_dir($cacheDir);
         $cacheurls = array();
         foreach($filedirs as $filename){
                if(!is_file($filename)){
                        continue;
                }
                $cacheUrl=getUrlFromCacheFile($filename);
                                if(count($clearUrls)){
                                    $cacheurls[]=$cacheUrl;
                                    continue;
                                }
                foreach($clearUrls as $clearUrl){
                  $clearUrl=str_replace($accessSite, $proxySite,$clearUrl);
                  $pos=strpos($cacheUrl,$clearUrl);
                  // echo "$cacheUrl,$clearUrl,$pos";
                  //比较http://www.b.com/a/b.jpg和http://www.b.com/a
                  if($pos===0){
                     $cacheurls[]=$cacheUrl;
                     break;
                   }
                }
        }

}else //清除一批URL
if($_POST["urls"]){
    $accessSite=$_POST["accessSite"];
    $proxySite=$proxySites[$accessSite];
    $output.="'font-size:16px;font-weight:bold'>执行结果
\n\n";
    $urls=explode ("\n",$_POST["urls"]);
    foreach($urls as $url2){
        $url=trim($url2);
        $output.="------------------------$url start-----------------------------\n";
        $pos = strpos($url, $accessSite);
        if ($pos !== false && $pos==0) {
            $url=str_replace($accessSite, $proxySite,$url);
            if(purge($proxyIp,$proxyPort,$url)==0){
                $result[$url2]=0;
            }else{
                $result[$url2]=1;
            }
        }else{
            $output.="skip $url\n";
            $result[$url2]=-1;
        }
        $output.="------------------------$url end -----------------------------\n";
    }
    $output.="\n";
}else//清除某个目录下的所有文件
if($_POST["dirs"]){
    $accessSite=$_POST["accessSite"];
    $proxySite=$proxySites[$accessSite];
    $clearUrls=array();
    $clearUrls=explode ("\n",$_POST["dirs"]);
    if($$proxySite){
        foreach($ds as $d){
            $d=str_replace($accessSite, $proxySite,$d);
            $clearUrls[]=$d;
        }
    }
    scan_dir($cacheDir);
    $cacheurls = array();
    foreach($filedirs as $filename){
        if(!is_file($filename)){
            continue;
        }
        $cacheUrl=getUrlFromCacheFile($filename);

        foreach($clearUrls as $clearUrl){
         $clearUrl=str_replace($accessSite, $proxySite,$clearUrl);
            $pos=strpos($cacheUrl,$clearUrl);
            // echo "$cacheUrl,$clearUrl,$pos";
            //比较http://www.b.com/a/b.jpg和http://www.b.com/a
            if($pos===0){
                    $cacheurls[]=$cacheUrl;
                    break;
            }
        }
    }
    if(count($cacheurls) > 0){
        $accessSite=$_POST["accessSite"];
        $proxySite=$proxySites[$accessSite];
        $output.="'font-size:16px;font-weight:bold'>执行结果
\n\n";
        foreach($cacheurls as $url2){

            $url=trim($url2);
            $output.="------------------------$url start-----------------------------\n";
            $pos = strpos($url, $accessSite);
            if(purge($proxyIp,$proxyPort,$url)==0){
                    $result[$url2]=0;
            }else{
                    $result[$url2]=1;
            }
            $output.="------------------------$url end -----------------------------\n";
        }
        $output.="\n";
    }else{
        foreach($clearUrls as $u){
            $result[$u]=-1;
        }
    }
}
?>


"http://www.w3.org/1999/xhtml">

"Content-Type" content="text/html; charset=utf-8" />
刷新squid


    if($result){
        echo "URL结果\n";
        foreach($result as $url=>$isOk){
            switch($isOk){
                case 0://成功
                $r="成功";
                break;
                case 1://成功
                $r="失败";
                break;
                case -1://跳过
                $r="跳过";
                break;
            }
            if($$proxySite){
                $url=str_replace($proxySite, $accessSite, $url);
            }
            echo "$url$r\n";
        }
        echo "\n";
    }
?>

"" method="post">

选择站点：

"accessSite" id="accessSite">

        foreach($proxySites as $accessSite => $proxySite){
        $isSelected=$_POST["accessSite"]==$accessSite?"selected":"";
            echo "$accessSite\n";
        }
    ?>

  </span></li>
    
    
    
    <li><span>    </span><span class="keyword">function</span><span> view(){  </span></li>
    
    
    
    <li class="alt"><span>        location=</span><span class="string">"?accessSite="</span><span>+document.getElementById(</span><span class="string">"accessSite"</span><span>).value+</span><span class="string">"&view=1"</span><span>;      </span></li>
    
    
    
    <li><span>    }      </span></li>
    
    
    
    <li class="alt"><span>
"checkbox" name="view" value="1" echo $_POST["view"]?"checked":"";?>/>for="view">只查看

输入一组URL(一个一行)：
"urls" style="width:1000px;height:200px;">if($_POST["view"])foreach($cacheurls as $cacheurl){echo "$cacheurl\n";}?>
刷新目录(一个一行)：
"dirs" style="width:1000px;height:200px;">
"submit" value="提交" />



    echo $output;
?>


//清除某个url
function purge($proxyIp,$proxyPort,$url)
{
    global $output;
    $host = parse_url($url);
    $host = $host['host'];
    $purge_url=str_replace("http://".$host,"/purge",$url);
    if (emptyempty($proxyIp)) {
        $proxyIp = gethostbyname($host);
    }
    if (emptyempty($proxyPort)) {
        $proxyPort = "80";
    }
    $output.="正在从服务器".$proxyIp."更新".$url."\n";
    $errstr = '';
    $errno = '';
    $fp = fsockopen ($proxyIp, $proxyPort, $errno, $errstr, 2);
    if (!$fp)
    {
         $output.="连接失败！";
         return -1;
    }
    else
    {
        $out = "GET ".$purge_url." HTTP/1.1\r\n";
        $out .= "Host:".$host."\r\n";
        $out .= "Connection: close\r\n\r\n";
        $output.="***********request start**************\n";
        $output.=$out;
        $output.="***********request end **************\n";
        fputs ($fp, $out);
        $output.="***********response start**************\n";
        //是否更新成功
        $isOk=false;
        while($out = fgets($fp , 4096)){
            if(strpos($out,"200 OK\r\n")!==FALSE){
                //更新成功
                $isOk=true;
            }
            $output.=$out;
            if($out=="\r\n"){
                break;
            }
        }
        fclose ($fp);
        $output.="***********response end **************\n";
        flush();
        if($isOk){
            return 0;
        }else{
            return 1;
        }
    }
}

//递归扫描cache目录下所有文件路径
function scan_dir($dir) {
        global $filedirs;
        if (!is_dir($dir)) return false;
        if ($dh = opendir($dir)) {
            while (($file = readdir($dh)) !== false) {
                if ($file[0] == '.') continue;
                if($file=='swap.state')continue;
                $fullpath = "$dir/$file";
                $filedirs[] = $fullpath;
                if (is_dir($fullpath))
                    scan_dir($fullpath);
            }
            closedir($dh);
        }
        return $filedirs;
}
//从cache文件中提取真实的URL
function getUrlFromCacheFile($filename){
        //cache文件头长度
        $headerLen=0x1E;
        $handle = fopen($filename, "rb");
        if(!$handle){
            return -1;
        }
        //读取文件的前1k字节
        $contents = fread($handle, 1024);
        fclose($handle);
        if(strlen($contents)<=$headerLen){
            return -2;
        }
        //截掉文件头
        $contents=substr($contents,$headerLen);

        //cache文件的分隔符为\A
        $pos=strpos($contents, chr(0x0A));
        if($pos===FALSE){
            return -3;
        }
        //获取分隔符前的字符串
        $contents="http://".substr($contents,0,$pos);
        return $contents;
}
?>

测试