基于Nginx的Mencached缓存配置详解_nginx,网络安全爱好者中心-神域博客网

这篇文章主要介绍了基于Nginx的Mencached缓存配置详解，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

简介

memcached是一套分布式的高速缓存系统，memcached缺乏认证以及安全管制，这代表应该将memcached服务器放置在防火墙后。memcached的API使用三十二比特的循环冗余校验（CRC-32）计算键值后，将数据分散在不同的机器上。当表格满了以后，接下来新增的数据会以LRU机制替换掉。由于memcached通常只是当作缓存系统使用，所以使用memcached的应用程序在写回较慢的系统时（像是后端的数据库）需要额外的代码更新memcached内的数据

特征

memcached作为高速运行的分布式缓存服务器，具有以下的特点:

协议简单
基于libevent的事件处理
内置内存存储方式
memcached不互相通信的分布式

前期准备

准备三台Centos7虚拟机，配置IP地址和hostname，关闭防火墙和selinux，同步系统时间，修改IP地址和hostname映射

ip	hostname
192.168.29.132	master
192.168.29.138	bak
192.168.29.133	mid

master和bak机器部署Nginx和PHP

部署memcache

mid机器部署memcached客户端

[root@mid ~]# yum install memcached -y
#启动服务
[root@mid ~]# systemctl start memcached.service

#查看启动情况,点击回车出现ERROR则启动成功
[root@master ~]# telnet 192.168.29.133 11211
Trying 192.168.29.133...
Connected to 192.168.29.133.
Escape character is \'^]\'.

ERROR

master和mid机器部署PHP的memcached扩展

下载libmemcached和memcached压缩包

#解压并安装libmemcached
[root@master ~]#tar -xvf libmemcached-1.0.18.tar.gz
[root@master ~]#cd libmemcached-1.0.18
#若编译报错，将clients/memflush.cc中报错相应位置的false改为NULL
[root@master ~]#./configure --prefix=/usr/local/libmemcached
make && make install

#解压并安装memcached
[root@master ~]#tar -zxvf memcached-3.1.5.tgz
[root@master ~]#cd memcached-3.1.5
[root@master ~]#phpize
[root@master ~]#./configure --with-libmemcached-dir=/usr/local/libmemcached --disable-memcached-sasl
[root@master ~]#make && make install

#完成后观察php目录下的lib/php/extensions/no-debug-zts-20170718/是否有扩展
memcached.so

#添加扩展至php配置文件
[root@master ~]# vi /usr/local/php/etc/php.ini
extension=memcached.so

测试验证

[root@master ~]# vi /usr/local/nginx/html/test.php 
<?php
phpinfo();
?>

访问http://ip/test.php

图片[1]-基于Nginx的Mencached缓存配置详解_nginx-安全小天地

注:bak机器进行相同操作

配置缓存

配置Nginx配置文件

[root@master ~]# cat /usr/local/nginx/conf/nginx.conf
worker_processes 1;
events {
  worker_connections 1024;
}
http {
  include    mime.types;
  default_type application/octet-stream;
  sendfile    on;
  keepalive_timeout 65;
  server {
    listen    80;
    server_name localhost;
    location / {
      root  html;
      index index.html index.htm;
    }
  #memcached缓存配置，有缓存则读取，没有缓存则报404错误
  location /demo/ {
    set $memcached_key $request_uri;
    add_header X-mem-key $memcached_key;
    memcached_pass 192.168.29.133:11211;
    default_type text/html;
    #报错后转到特定Location
    error_page 404 502 504 = @mymemcached;
  }
  #配置重写策略执行特定php文件
  location @mymemcached {
    rewrite .* /demo.php?key=$request_uri;
  }
    location ~ \\.php$ {
      root      html;
      fastcgi_pass  127.0.0.1:9000;
      fastcgi_index index.php;
      fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
      include    fastcgi_params;
    }
  }
}

编写PHP文件设置memcached缓存

#创建demo文件夹
[root@master ~] mkdir /usr/local/nginx/html/demo
#创建测试文件
[root@master ~] echo \"123\" >> /usr/local/nginx/html/demo/123.html

[root@master ~]# vi /usr/local/nginx/html/demo.php 
<?php
  $fn=dirname(__FILE__) . $_SERVER[\'REQUEST_URI\'];
  if(file_exists($fn)){
    $data=file_get_contents($fn);
    $m=new Memcached();
    $server=array(
      array(\'192.168.29.133\',11211)
    );
    $m->addServers($server);
    $r=$m->set($_GET[\'key\'],$data);
    header(\'Content-Length:\'.filesize($fn).\"\\r\\n\");
    header(\'Content-Type:file\'.\"\\r\\n\");
    header(\'X-cache:MISS:\'.\"\\r\\n\");
    echo $data;
  }
  #不存在demo文件夹则返回首页
  else{
    header(\'Location:../index.html\'.\"\\r\\n\");
  }
?>

注:bak机器进行相同的设置

测试验证

#可看出第一次memcache中没有缓存，第二次击中缓存
[root@bak ~]# curl -I http://192.168.29.132/demo/123.html
HTTP/1.1 200 OK
Server: nginx/1.16.1
Date: Thu, 25 Jun 2020 02:23:00 GMT
Content-Type: file
Content-Length: 4
Connection: keep-alive
X-Powered-By: PHP/7.2.26
X-cache: MISS:

[root@bak ~]# curl -I http://192.168.29.132/demo/123.html
HTTP/1.1 200 OK
Server: nginx/1.16.1
Date: Thu, 25 Jun 2020 02:23:01 GMT
Content-Type: text/html
Content-Length: 4
Connection: keep-alive
X-mem-key: /demo/123.html
Accept-Ranges: bytes

#当设置缓存后，访问相同的缓存key时，即使发起访问的机器不相同也同样能击中缓存
[root@master ~]# curl -I http://192.168.29.138/demo/123.html
HTTP/1.1 200 OK
Server: nginx/1.16.1
Date: Thu, 25 Jun 2020 02:29:46 GMT
Content-Type: text/html
Content-Length: 4
Connection: keep-alive
X-mem-key: /demo/123.html
Accept-Ranges: bytes

查看memcached缓存状态

图片[2]-基于Nginx的Mencached缓存配置详解_nginx-安全小天地

图片[3]-基于Nginx的Mencached缓存配置详解_nginx-安全小天地

memcached监控文件

<?php
/*
 +----------------------------------------------------------------------+
 | PHP Version 5                            |
 +----------------------------------------------------------------------+
 | Copyright (c) 1997-2004 The PHP Group                |
 +----------------------------------------------------------------------+
 | This source file is subject to version 3.0 of the PHP license,    |
 | that is bundled with this package in the file LICENSE, and is    |
 | available through the world-wide-web at the following url:      |
 | http://www.php.net/license/3_0.txt.                 |
 | If you did not receive a copy of the PHP license and are unable to  |
 | obtain it through the world-wide-web, please send a note to     |
 | license@php.net so we can mail you a copy immediately.        |
 +----------------------------------------------------------------------+
 | Author: Harun Yayli <harunyayli at gmail.com>            |
 +----------------------------------------------------------------------+
*/
//memcached图形化小工具
$VERSION=\'$Id: memcache.php,v 1.1.2.3 2008/08/28 18:07:54 mikl Exp $\';
#设置用户名
define(\'ADMIN_USERNAME\',\'admin\'); 
#设置密码
define(\'ADMIN_PASSWORD\',\'123456\'); 

define(\'DATE_FORMAT\',\'Y/m/d H:i:s\');
define(\'GRAPH_SIZE\',200);
define(\'MAX_ITEM_DUMP\',50);

#设置memcached主机信息
$MEMCACHE_SERVERS[] = \'192.168.29.133:11211\'; 

////////// END OF DEFAULT CONFIG AREA /////////////////////////////////////////////////////////////

///////////////// Password protect ////////////////////////////////////////////////////////////////
if (!isset($_SERVER[\'PHP_AUTH_USER\']) || !isset($_SERVER[\'PHP_AUTH_PW\']) ||
      $_SERVER[\'PHP_AUTH_USER\'] != ADMIN_USERNAME ||$_SERVER[\'PHP_AUTH_PW\'] != ADMIN_PASSWORD) {
      Header(\"WWW-Authenticate: Basic realm=\\\"Memcache Login\\\"\");
      Header(\"HTTP/1.0 401 Unauthorized\");

      echo <<<EOB
        <html><body>
        <h1>Rejected!</h1>
        <big>Wrong Username or Password!</big>
        </body></html>
EOB;
      exit;
}

///////////MEMCACHE FUNCTIONS /////////////////////////////////////////////////////////////////////

function sendMemcacheCommands($command){
  global $MEMCACHE_SERVERS;
  $result = array();

  foreach($MEMCACHE_SERVERS as $server){
    $strs = explode(\':\',$server);
    $host = $strs[0];
    $port = $strs[1];
    $result[$server] = sendMemcacheCommand($host,$port,$command);
  }
  return $result;
}
function sendMemcacheCommand($server,$port,$command){

  $s = @fsockopen($server,$port);
  if (!$s){
    die(\"Cant connect to:\".$server.\':\'.$port);
  }

  fwrite($s, $command.\"\\r\\n\");

  $buf=\'\';
  while ((!feof($s))) {
    $buf .= fgets($s, 256);
    if (strpos($buf,\"END\\r\\n\")!==false){ // stat says end
      break;
    }
    if (strpos($buf,\"DELETED\\r\\n\")!==false || strpos($buf,\"NOT_FOUND\\r\\n\")!==false){ // delete says these
      break;
    }
    if (strpos($buf,\"OK\\r\\n\")!==false){ // flush_all says ok
      break;
    }
  }
  fclose($s);
  return parseMemcacheResults($buf);
}
function parseMemcacheResults($str){

  $res = array();
  $lines = explode(\"\\r\\n\",$str);
  $cnt = count($lines);
  for($i=0; $i< $cnt; $i++){
    $line = $lines[$i];
    $l = explode(\' \',$line,3);
    if (count($l)==3){
      $res[$l[0]][$l[1]]=$l[2];
      if ($l[0]==\'VALUE\'){ // next line is the value
        $res[$l[0]][$l[1]] = array();
        list ($flag,$size)=explode(\' \',$l[2]);
        $res[$l[0]][$l[1]][\'stat\']=array(\'flag\'=>$flag,\'size\'=>$size);
        $res[$l[0]][$l[1]][\'value\']=$lines[++$i];
      }
    }elseif($line==\'DELETED\' || $line==\'NOT_FOUND\' || $line==\'OK\'){
      return $line;
    }
  }
  return $res;

}

function dumpCacheSlab($server,$slabId,$limit){
  list($host,$port) = explode(\':\',$server);
  $resp = sendMemcacheCommand($host,$port,\'stats cachedump \'.$slabId.\' \'.$limit);

  return $resp;

}

function flushServer($server){
  list($host,$port) = explode(\':\',$server);
  $resp = sendMemcacheCommand($host,$port,\'flush_all\');
  return $resp;
}
function getCacheItems(){
 $items = sendMemcacheCommands(\'stats items\');
 $serverItems = array();
 $totalItems = array();
 foreach ($items as $server=>$itemlist){
  $serverItems[$server] = array();
  $totalItems[$server]=0;
  if (!isset($itemlist[\'STAT\'])){
    continue;
  }

  $iteminfo = $itemlist[\'STAT\'];

  foreach($iteminfo as $keyinfo=>$value){
    if (preg_match(\'/items\\:(\\d+?)\\:(.+?)$/\',$keyinfo,$matches)){
      $serverItems[$server][$matches[1]][$matches[2]] = $value;
      if ($matches[2]==\'number\'){
        $totalItems[$server] +=$value;
      }
    }
  }
 }
 return array(\'items\'=>$serverItems,\'counts\'=>$totalItems);
}
function getMemcacheStats($total=true){
  $resp = sendMemcacheCommands(\'stats\');
  if ($total){
    $res = array();
    foreach($resp as $server=>$r){
      foreach($r[\'STAT\'] as $key=>$row){
        if (!isset($res[$key])){
          $res[$key]=null;
        }
        switch ($key){
          case \'pid\':
            $res[\'pid\'][$server]=$row;
            break;
          case \'uptime\':
            $res[\'uptime\'][$server]=$row;
            break;
          case \'time\':
            $res[\'time\'][$server]=$row;
            break;
          case \'version\':
            $res[\'version\'][$server]=$row;
            break;
          case \'pointer_size\':
            $res[\'pointer_size\'][$server]=$row;
            break;
          case \'rusage_user\':
            $res[\'rusage_user\'][$server]=$row;
            break;
          case \'rusage_system\':
            $res[\'rusage_system\'][$server]=$row;
            break;
          case \'curr_items\':
            $res[\'curr_items\']+=$row;
            break;
          case \'total_items\':
            $res[\'total_items\']+=$row;
            break;
          case \'bytes\':
            $res[\'bytes\']+=$row;
            break;
          case \'curr_connections\':
            $res[\'curr_connections\']+=$row;
            break;
          case \'total_connections\':
            $res[\'total_connections\']+=$row;
            break;
          case \'connection_structures\':
            $res[\'connection_structures\']+=$row;
            break;
          case \'cmd_get\':
            $res[\'cmd_get\']+=$row;
            break;
          case \'cmd_set\':
            $res[\'cmd_set\']+=$row;
            break;
          case \'get_hits\':
            $res[\'get_hits\']+=$row;
            break;
          case \'get_misses\':
            $res[\'get_misses\']+=$row;
            break;
          case \'evictions\':
            $res[\'evictions\']+=$row;
            break;
          case \'bytes_read\':
            $res[\'bytes_read\']+=$row;
            break;
          case \'bytes_written\':
            $res[\'bytes_written\']+=$row;
            break;
          case \'limit_maxbytes\':
            $res[\'limit_maxbytes\']+=$row;
            break;
          case \'threads\':
            $res[\'rusage_system\'][$server]=$row;
            break;
        }
      }
    }
    return $res;
  }
  return $resp;
}

//////////////////////////////////////////////////////

//
// don\'t cache this page
//
header(\"Cache-Control: no-store, no-cache, must-revalidate\"); // HTTP/1.1
header(\"Cache-Control: post-check=0, pre-check=0\", false);
header(\"Pragma: no-cache\");                  // HTTP/1.0

function duration($ts) {
  global $time;
  $years = (int)((($time - $ts)/(7*86400))/52.177457);
  $rem = (int)(($time-$ts)-($years * 52.177457 * 7 * 86400));
  $weeks = (int)(($rem)/(7*86400));
  $days = (int)(($rem)/86400) - $weeks*7;
  $hours = (int)(($rem)/3600) - $days*24 - $weeks*7*24;
  $mins = (int)(($rem)/60) - $hours*60 - $days*24*60 - $weeks*7*24*60;
  $str = \'\';
  if($years==1) $str .= \"$years year, \";
  if($years>1) $str .= \"$years years, \";
  if($weeks==1) $str .= \"$weeks week, \";
  if($weeks>1) $str .= \"$weeks weeks, \";
  if($days==1) $str .= \"$days day,\";
  if($days>1) $str .= \"$days days,\";
  if($hours == 1) $str .= \" $hours hour and\";
  if($hours>1) $str .= \" $hours hours and\";
  if($mins == 1) $str .= \" 1 minute\";
  else $str .= \" $mins minutes\";
  return $str;
}

// create graphics
//
function graphics_avail() {
  return extension_loaded(\'gd\');
}

function bsize($s) {
  foreach (array(\'\',\'K\',\'M\',\'G\') as $i => $k) {
    if ($s < 1024) break;
    $s/=1024;
  }
  return sprintf(\"%5.1f %sBytes\",$s,$k);
}

// create menu entry
function menu_entry($ob,$title) {
  global $PHP_SELF;
  if ($ob==$_GET[\'op\']){
    return \"<li><a class=\\\"child_active\\\" href=\\\"$PHP_SELF&op=$ob\\\">$title</a></li>\";
  }
  return \"<li><a class=\\\"active\\\" href=\\\"$PHP_SELF&op=$ob\\\">$title</a></li>\";
}

function getHeader(){
  $header = <<<EOB
<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">
<html>
<head><title>MEMCACHE INFO</title>
<style type=\"text/css\"><!--
body { background:white; font-size:100.01%; margin:0; padding:0; }
body,p,td,th,input,submit { font-size:0.8em;font-family:arial,helvetica,sans-serif; }
* html body  {font-size:0.8em}
* html p   {font-size:0.8em}
* html td   {font-size:0.8em}
* html th   {font-size:0.8em}
* html input {font-size:0.8em}
* html submit {font-size:0.8em}
td { vertical-align:top }
a { color:black; font-weight:none; text-decoration:none; }
a:hover { text-decoration:underline; }
div.content { padding:1em 1em 1em 1em; position:absolute; width:97%; z-index:100; }

h1.memcache { background:rgb(153,153,204); margin:0; padding:0.5em 1em 0.5em 1em; }
* html h1.memcache { margin-bottom:-7px; }
h1.memcache a:hover { text-decoration:none; color:rgb(90,90,90); }
h1.memcache span.logo {
  background:rgb(119,123,180);
  color:black;
  border-right: solid black 1px;
  border-bottom: solid black 1px;
  font-style:italic;
  font-size:1em;
  padding-left:1.2em;
  padding-right:1.2em;
  text-align:right;
  display:block;
  width:130px;
  }
h1.memcache span.logo span.name { color:white; font-size:0.7em; padding:0 0.8em 0 2em; }
h1.memcache span.nameinfo { color:white; display:inline; font-size:0.4em; margin-left: 3em; }
h1.memcache div.copy { color:black; font-size:0.4em; position:absolute; right:1em; }
hr.memcache {
  background:white;
  border-bottom:solid rgb(102,102,153) 1px;
  border-style:none;
  border-top:solid rgb(102,102,153) 10px;
  height:12px;
  margin:0;
  margin-top:1px;
  padding:0;
}

ol,menu { margin:1em 0 0 0; padding:0.2em; margin-left:1em;}
ol.menu li { display:inline; margin-right:0.7em; list-style:none; font-size:85%}
ol.menu a {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:white;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  margin-left: 5px;
  }
ol.menu a.child_active {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:white;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  border-left: solid black 5px;
  margin-left: 0px;
  }
ol.menu span.active {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:black;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  border-left: solid black 5px;
  }
ol.menu span.inactive {
  background:rgb(193,193,244);
  border:solid rgb(182,182,233) 2px;
  color:white;
  font-weight:bold;
  margin-right:0em;
  padding:0.1em 0.5em 0.1em 0.5em;
  text-decoration:none;
  margin-left: 5px;
  }
ol.menu a:hover {
  background:rgb(193,193,244);
  text-decoration:none;
  }

div.info {
  background:rgb(204,204,204);
  border:solid rgb(204,204,204) 1px;
  margin-bottom:1em;
  }
div.info h2 {
  background:rgb(204,204,204);
  color:black;
  font-size:1em;
  margin:0;
  padding:0.1em 1em 0.1em 1em;
  }
div.info table {
  border:solid rgb(204,204,204) 1px;
  border-spacing:0;
  width:100%;
  }
div.info table th {
  background:rgb(204,204,204);
  color:white;
  margin:0;
  padding:0.1em 1em 0.1em 1em;
  }
div.info table th a.sortable { color:black; }
div.info table tr.tr-0 { background:rgb(238,238,238); }
div.info table tr.tr-1 { background:rgb(221,221,221); }
div.info table td { padding:0.3em 1em 0.3em 1em; }
div.info table td.td-0 { border-right:solid rgb(102,102,153) 1px; white-space:nowrap; }
div.info table td.td-n { border-right:solid rgb(102,102,153) 1px; }
div.info table td h3 {
  color:black;
  font-size:1.1em;
  margin-left:-0.3em;
  }
.td-0 a , .td-n a, .tr-0 a , tr-1 a {
  text-decoration:underline;
}
div.graph { margin-bottom:1em }
div.graph h2 { background:rgb(204,204,204);; color:black; font-size:1em; margin:0; padding:0.1em 1em 0.1em 1em; }
div.graph table { border:solid rgb(204,204,204) 1px; color:black; font-weight:normal; width:100%; }
div.graph table td.td-0 { background:rgb(238,238,238); }
div.graph table td.td-1 { background:rgb(221,221,221); }
div.graph table td { padding:0.2em 1em 0.4em 1em; }

div.div1,div.div2 { margin-bottom:1em; width:35em; }
div.div3 { position:absolute; left:40em; top:1em; width:580px; }
//div.div3 { position:absolute; left:37em; top:1em; right:1em; }

div.sorting { margin:1.5em 0em 1.5em 2em }
.center { text-align:center }
.aright { position:absolute;right:1em }
.right { text-align:right }
.ok { color:rgb(0,200,0); font-weight:bold}
.failed { color:rgb(200,0,0); font-weight:bold}

span.box {
  border: black solid 1px;
  border-right:solid black 2px;
  border-bottom:solid black 2px;
  padding:0 0.5em 0 0.5em;
  margin-right:1em;
}
span.green { background:#60F060; padding:0 0.5em 0 0.5em}
span.red { background:#D06030; padding:0 0.5em 0 0.5em }

div.authneeded {
  background:rgb(238,238,238);
  border:solid rgb(204,204,204) 1px;
  color:rgb(200,0,0);
  font-size:1.2em;
  font-weight:bold;
  padding:2em;
  text-align:center;
  }

input {
  background:rgb(153,153,204);
  border:solid rgb(102,102,153) 2px;
  color:white;
  font-weight:bold;
  margin-right:1em;
  padding:0.1em 0.5em 0.1em 0.5em;
  }
//-->
</style>
</head>
<body>
<div class=\"head\">
  <h1 class=\"memcache\">
    <span class=\"logo\"><a href=\"http://pecl.php.net/package/memcache\" rel=\"external nofollow\" >memcache</a></span>
    <span class=\"nameinfo\">memcache.php by <a href=\"http://livebookmark.net\" rel=\"external nofollow\" >Harun Yayli</a></span>
  </h1>
  <hr class=\"memcache\">
</div>
<div class=content>
EOB;

  return $header;
}
function getFooter(){
  global $VERSION;
  $footer = \'</div><!-- Based on apc.php \'.$VERSION.\'--></body>
</html>
\';

  return $footer;

}
function getMenu(){
  global $PHP_SELF;
echo \"<ol class=menu>\";
if ($_GET[\'op\']!=4){
echo <<<EOB
  <li><a href=\"$PHP_SELF&op={$_GET[\'op\']}\" rel=\"external nofollow\" >Refresh Data</a></li>
EOB;
}
else {
echo <<<EOB
  <li><a href=\"$PHP_SELF&op=2}\" rel=\"external nofollow\" >Back</a></li>
EOB;
}
echo
  menu_entry(1,\'View Host Stats\'),
  menu_entry(2,\'Variables\');

echo <<<EOB
  </ol>
  <br/>
EOB;
}

// TODO, AUTH

$_GET[\'op\'] = !isset($_GET[\'op\'])? \'1\':$_GET[\'op\'];
$PHP_SELF= isset($_SERVER[\'PHP_SELF\']) ? htmlentities(strip_tags($_SERVER[\'PHP_SELF\'],\'\')) : \'\';

$PHP_SELF=$PHP_SELF.\'?\';
$time = time();
// sanitize _GET

foreach($_GET as $key=>$g){
  $_GET[$key]=htmlentities($g);
}

// singleout
// when singleout is set, it only gives details for that server.
if (isset($_GET[\'singleout\']) && $_GET[\'singleout\']>=0 && $_GET[\'singleout\'] <count($MEMCACHE_SERVERS)){
  $MEMCACHE_SERVERS = array($MEMCACHE_SERVERS[$_GET[\'singleout\']]);
}

// display images
if (isset($_GET[\'IMG\'])){
  $memcacheStats = getMemcacheStats();
  $memcacheStatsSingle = getMemcacheStats(false);

  if (!graphics_avail()) {
    exit(0);
  }

  function fill_box($im, $x, $y, $w, $h, $color1, $color2,$text=\'\',$placeindex=\'\') {
    global $col_black;
    $x1=$x+$w-1;
    $y1=$y+$h-1;

    imagerectangle($im, $x, $y1, $x1+1, $y+1, $col_black);
    if($y1>$y) imagefilledrectangle($im, $x, $y, $x1, $y1, $color2);
    else imagefilledrectangle($im, $x, $y1, $x1, $y, $color2);
    imagerectangle($im, $x, $y1, $x1, $y, $color1);
    if ($text) {
      if ($placeindex>0) {

        if ($placeindex<16)
        {
          $px=5;
          $py=$placeindex*12+6;
          imagefilledrectangle($im, $px+90, $py+3, $px+90-4, $py-3, $color2);
          imageline($im,$x,$y+$h/2,$px+90,$py,$color2);
          imagestring($im,2,$px,$py-6,$text,$color1);

        } else {
          if ($placeindex<31) {
            $px=$x+40*2;
            $py=($placeindex-15)*12+6;
          } else {
            $px=$x+40*2+100*intval(($placeindex-15)/15);
            $py=($placeindex%15)*12+6;
          }
          imagefilledrectangle($im, $px, $py+3, $px-4, $py-3, $color2);
          imageline($im,$x+$w,$y+$h/2,$px,$py,$color2);
          imagestring($im,2,$px+2,$py-6,$text,$color1);
        }
      } else {
        imagestring($im,4,$x+5,$y1-16,$text,$color1);
      }
    }
  }

  function fill_arc($im, $centerX, $centerY, $diameter, $start, $end, $color1,$color2,$text=\'\',$placeindex=0) {
    $r=$diameter/2;
    $w=deg2rad((360+$start+($end-$start)/2)%360);

    if (function_exists(\"imagefilledarc\")) {
      // exists only if GD 2.0.1 is avaliable
      imagefilledarc($im, $centerX+1, $centerY+1, $diameter, $diameter, $start, $end, $color1, IMG_ARC_PIE);
      imagefilledarc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color2, IMG_ARC_PIE);
      imagefilledarc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color1, IMG_ARC_NOFILL|IMG_ARC_EDGED);
    } else {
      imagearc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($start)) * $r, $centerY + sin(deg2rad($start)) * $r, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($start+1)) * $r, $centerY + sin(deg2rad($start)) * $r, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($end-1))  * $r, $centerY + sin(deg2rad($end))  * $r, $color2);
      imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($end))  * $r, $centerY + sin(deg2rad($end))  * $r, $color2);
      imagefill($im,$centerX + $r*cos($w)/2, $centerY + $r*sin($w)/2, $color2);
    }
    if ($text) {
      if ($placeindex>0) {
        imageline($im,$centerX + $r*cos($w)/2, $centerY + $r*sin($w)/2,$diameter, $placeindex*12,$color1);
        imagestring($im,4,$diameter, $placeindex*12,$text,$color1);

      } else {
        imagestring($im,4,$centerX + $r*cos($w)/2, $centerY + $r*sin($w)/2,$text,$color1);
      }
    }
  }
  $size = GRAPH_SIZE; // image size
  $image = imagecreate($size+50, $size+10);

  $col_white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
  $col_red  = imagecolorallocate($image, 0xD0, 0x60, 0x30);
  $col_green = imagecolorallocate($image, 0x60, 0xF0, 0x60);
  $col_black = imagecolorallocate($image,  0,  0,  0);

  imagecolortransparent($image,$col_white);

  switch ($_GET[\'IMG\']){
    case 1: // pie chart
      $tsize=$memcacheStats[\'limit_maxbytes\'];
      $avail=$tsize-$memcacheStats[\'bytes\'];
      $x=$y=$size/2;
      $angle_from = 0;
      $fuzz = 0.000001;

      foreach($memcacheStatsSingle as $serv=>$mcs) {
        $free = $mcs[\'STAT\'][\'limit_maxbytes\']-$mcs[\'STAT\'][\'bytes\'];
        $used = $mcs[\'STAT\'][\'bytes\'];

        if ($free>0){
        // draw free
          $angle_to = ($free*360)/$tsize;
          $perc =sprintf(\"%.2f%%\", ($free *100) / $tsize) ;

          fill_arc($image,$x,$y,$size,$angle_from,$angle_from + $angle_to ,$col_black,$col_green,$perc);
          $angle_from = $angle_from + $angle_to ;
        }
        if ($used>0){
        // draw used
          $angle_to = ($used*360)/$tsize;
          $perc =sprintf(\"%.2f%%\", ($used *100) / $tsize) ;
          fill_arc($image,$x,$y,$size,$angle_from,$angle_from + $angle_to ,$col_black,$col_red, \'(\'.$perc.\')\' );
          $angle_from = $angle_from+ $angle_to ;
        }
        }

    break;

    case 2: // hit miss

      $hits = ($memcacheStats[\'get_hits\']==0) ? 1:$memcacheStats[\'get_hits\'];
      $misses = ($memcacheStats[\'get_misses\']==0) ? 1:$memcacheStats[\'get_misses\'];
      $total = $hits + $misses ;

      fill_box($image, 30,$size,50,-$hits*($size-21)/$total,$col_black,$col_green,sprintf(\"%.1f%%\",$hits*100/$total));
      fill_box($image,130,$size,50,-max(4,($total-$hits)*($size-21)/$total),$col_black,$col_red,sprintf(\"%.1f%%\",$misses*100/$total));
    break;

  }
  header(\"Content-type: image/png\");
  imagepng($image);
  exit;
}

echo getHeader();
echo getMenu();

switch ($_GET[\'op\']) {

  case 1: // host stats
    $phpversion = phpversion();
    $memcacheStats = getMemcacheStats();
    $memcacheStatsSingle = getMemcacheStats(false);

    $mem_size = $memcacheStats[\'limit_maxbytes\'];
    $mem_used = $memcacheStats[\'bytes\'];
    $mem_avail= $mem_size-$mem_used;
    $startTime = time()-array_sum($memcacheStats[\'uptime\']);

    $curr_items = $memcacheStats[\'curr_items\'];
    $total_items = $memcacheStats[\'total_items\'];
    $hits = ($memcacheStats[\'get_hits\']==0) ? 1:$memcacheStats[\'get_hits\'];
    $misses = ($memcacheStats[\'get_misses\']==0) ? 1:$memcacheStats[\'get_misses\'];
    $sets = $memcacheStats[\'cmd_set\'];

    $req_rate = sprintf(\"%.2f\",($hits+$misses)/($time-$startTime));
    $hit_rate = sprintf(\"%.2f\",($hits)/($time-$startTime));
    $miss_rate = sprintf(\"%.2f\",($misses)/($time-$startTime));
    $set_rate = sprintf(\"%.2f\",($sets)/($time-$startTime));

    echo <<< EOB
    <div class=\"info div1\"><h2>General Cache Information</h2>
    <table cellspacing=0><tbody>
    <tr class=tr-1><td class=td-0>PHP Version</td><td>$phpversion</td></tr>
EOB;
    echo \"<tr class=tr-0><td class=td-0>Memcached Host\". ((count($MEMCACHE_SERVERS)>1) ? \'s\':\'\').\"</td><td>\";
    $i=0;
    if (!isset($_GET[\'singleout\']) && count($MEMCACHE_SERVERS)>1){
      foreach($MEMCACHE_SERVERS as $server){
         echo ($i+1).\'. <a href=\"\'.$PHP_SELF.\'&singleout=\'.$i++.\'\" rel=\"external nofollow\" >\'.$server.\'</a><br/>\';
      }
    }
    else{
      echo \'1.\'.$MEMCACHE_SERVERS[0];
    }
    if (isset($_GET[\'singleout\'])){
       echo \'<a href=\"\'.$PHP_SELF.\'\" rel=\"external nofollow\" >(all servers)</a><br/>\';
    }
    echo \"</td></tr>\\n\";
    echo \"<tr class=tr-1><td class=td-0>Total Memcache Cache</td><td>\".bsize($memcacheStats[\'limit_maxbytes\']).\"</td></tr>\\n\";

  echo <<<EOB
    </tbody></table>
    </div>

    <div class=\"info div1\"><h2>Memcache Server Information</h2>
EOB;
    foreach($MEMCACHE_SERVERS as $server){
      echo \'<table cellspacing=0><tbody>\';
      echo \'<tr class=tr-1><td class=td-1>\'.$server.\'</td><td><a href=\"\'.$PHP_SELF.\'&server=\'.array_search($server,$MEMCACHE_SERVERS).\'&op=6\" rel=\"external nofollow\" >[<b>Flush this server</b>]</a></td></tr>\';
      echo \'<tr class=tr-0><td class=td-0>Start Time</td><td>\',date(DATE_FORMAT,$memcacheStatsSingle[$server][\'STAT\'][\'time\']-$memcacheStatsSingle[$server][\'STAT\'][\'uptime\']),\'</td></tr>\';
      echo \'<tr class=tr-1><td class=td-0>Uptime</td><td>\',duration($memcacheStatsSingle[$server][\'STAT\'][\'time\']-$memcacheStatsSingle[$server][\'STAT\'][\'uptime\']),\'</td></tr>\';
      echo \'<tr class=tr-0><td class=td-0>Memcached Server Version</td><td>\'.$memcacheStatsSingle[$server][\'STAT\'][\'version\'].\'</td></tr>\';
      echo \'<tr class=tr-1><td class=td-0>Used Cache Size</td><td>\',bsize($memcacheStatsSingle[$server][\'STAT\'][\'bytes\']),\'</td></tr>\';
      echo \'<tr class=tr-0><td class=td-0>Total Cache Size</td><td>\',bsize($memcacheStatsSingle[$server][\'STAT\'][\'limit_maxbytes\']),\'</td></tr>\';
      echo \'</tbody></table>\';
    }
  echo <<<EOB

    </div>
    <div class=\"graph div3\"><h2>Host Status Diagrams</h2>
    <table cellspacing=0><tbody>
EOB;

  $size=\'width=\'.(GRAPH_SIZE+50).\' height=\'.(GRAPH_SIZE+10);
  echo <<<EOB
    <tr>
    <td class=td-0>Cache Usage</td>
    <td class=td-1>Hits &amp; Misses</td>
    </tr>
EOB;

  echo
    graphics_avail() ?
       \'<tr>\'.
       \"<td class=td-0><img alt=\\\"\\\" $size src=\\\"$PHP_SELF&IMG=1&\".(isset($_GET[\'singleout\'])? \'singleout=\'.$_GET[\'singleout\'].\'&\':\'\').\"$time\\\"></td>\".
       \"<td class=td-1><img alt=\\\"\\\" $size src=\\\"$PHP_SELF&IMG=2&\".(isset($_GET[\'singleout\'])? \'singleout=\'.$_GET[\'singleout\'].\'&\':\'\').\"$time\\\"></td></tr>\\n\"
      : \"\",
    \'<tr>\',
    \'<td class=td-0><span class=\"green box\">&nbsp;</span>Free: \',bsize($mem_avail).sprintf(\" (%.1f%%)\",$mem_avail*100/$mem_size),\"</td>\\n\",
    \'<td class=td-1><span class=\"green box\">&nbsp;</span>Hits: \',$hits.sprintf(\" (%.1f%%)\",$hits*100/($hits+$misses)),\"</td>\\n\",
    \'</tr>\',
    \'<tr>\',
    \'<td class=td-0><span class=\"red box\">&nbsp;</span>Used: \',bsize($mem_used ).sprintf(\" (%.1f%%)\",$mem_used *100/$mem_size),\"</td>\\n\",
    \'<td class=td-1><span class=\"red box\">&nbsp;</span>Misses: \',$misses.sprintf(\" (%.1f%%)\",$misses*100/($hits+$misses)),\"</td>\\n\";
    echo <<< EOB
  </tr>
  </tbody></table>
<br/>
  <div class=\"info\"><h2>Cache Information</h2>
    <table cellspacing=0><tbody>
    <tr class=tr-0><td class=td-0>Current Items(total)</td><td>$curr_items ($total_items)</td></tr>
    <tr class=tr-1><td class=td-0>Hits</td><td>{$hits}</td></tr>
    <tr class=tr-0><td class=td-0>Misses</td><td>{$misses}</td></tr>
    <tr class=tr-1><td class=td-0>Request Rate (hits, misses)</td><td>$req_rate cache requests/second</td></tr>
    <tr class=tr-0><td class=td-0>Hit Rate</td><td>$hit_rate cache requests/second</td></tr>
    <tr class=tr-1><td class=td-0>Miss Rate</td><td>$miss_rate cache requests/second</td></tr>
    <tr class=tr-0><td class=td-0>Set Rate</td><td>$set_rate cache requests/second</td></tr>
    </tbody></table>
    </div>

EOB;

  break;

  case 2: // variables

    $m=0;
    $cacheItems= getCacheItems();
    $items = $cacheItems[\'items\'];
    $totals = $cacheItems[\'counts\'];
    $maxDump = MAX_ITEM_DUMP;
    foreach($items as $server => $entries) {

    echo <<< EOB

      <div class=\"info\"><table cellspacing=0><tbody>
      <tr><th colspan=\"2\">$server</th></tr>
      <tr><th>Slab Id</th><th>Info</th></tr>
EOB;

      foreach($entries as $slabId => $slab) {
        $dumpUrl = $PHP_SELF.\'&op=2&server=\'.(array_search($server,$MEMCACHE_SERVERS)).\'&dumpslab=\'.$slabId;
        echo
          \"<tr class=tr-$m>\",
          \"<td class=td-0><center>\",\'<a href=\"\',$dumpUrl,\'\" rel=\"external nofollow\" >\',$slabId,\'</a>\',\"</center></td>\",
          \"<td class=td-last><b>Item count:</b> \",$slab[\'number\'],\'<br/><b>Age:</b>\',duration($time-$slab[\'age\']),\'<br/> <b>Evicted:</b>\',((isset($slab[\'evicted\']) && $slab[\'evicted\']==1)? \'Yes\':\'No\');
          if ((isset($_GET[\'dumpslab\']) && $_GET[\'dumpslab\']==$slabId) && (isset($_GET[\'server\']) && $_GET[\'server\']==array_search($server,$MEMCACHE_SERVERS))){
            echo \"<br/><b>Items: item</b><br/>\";
            $items = dumpCacheSlab($server,$slabId,$slab[\'number\']);
            // maybe someone likes to do a pagination here :)
            $i=1;
            foreach($items[\'ITEM\'] as $itemKey=>$itemInfo){
              $itemInfo = trim($itemInfo,\'[ ]\');

              echo \'<a href=\"\',$PHP_SELF,\'&op=4&server=\',(array_search($server,$MEMCACHE_SERVERS)),\'&key=\',base64_encode($itemKey).\'\" rel=\"external nofollow\" >\',$itemKey,\'</a>\';
              if ($i++ % 10 == 0) {
                echo \'<br/>\';
              }
              elseif ($i!=$slab[\'number\']+1){
                echo \',\';
              }
            }
          }

          echo \"</td></tr>\";
        $m=1-$m;
      }
    echo <<<EOB
      </tbody></table>
      </div><hr/>
EOB;
}
    break;

  break;

  case 4: //item dump
    if (!isset($_GET[\'key\']) || !isset($_GET[\'server\'])){
      echo \"No key set!\";
      break;
    }
    // I\'m not doing anything to check the validity of the key string.
    // probably an exploit can be written to delete all the files in key=base64_encode(\"\\n\\r delete all\").
    // somebody has to do a fix to this.
    $theKey = htmlentities(base64_decode($_GET[\'key\']));

    $theserver = $MEMCACHE_SERVERS[(int)$_GET[\'server\']];
    list($h,$p) = explode(\':\',$theserver);
    $r = sendMemcacheCommand($h,$p,\'get \'.$theKey);
    echo <<<EOB
    <div class=\"info\"><table cellspacing=0><tbody>
      <tr><th>Server<th>Key</th><th>Value</th><th>Delete</th></tr>
EOB;
    echo \"<tr><td class=td-0>\",$theserver,\"</td><td class=td-0>\",$theKey,
       \" <br/>flag:\",$r[\'VALUE\'][$theKey][\'stat\'][\'flag\'],
       \" <br/>Size:\",bsize($r[\'VALUE\'][$theKey][\'stat\'][\'size\']),
       \"</td><td>\",chunk_split($r[\'VALUE\'][$theKey][\'value\'],40),\"</td>\",
       \'<td><a href=\"\',$PHP_SELF,\'&op=5&server=\',(int)$_GET[\'server\'],\'&key=\',base64_encode($theKey),\" rel=\"external nofollow\" \\\">Delete</a></td>\",\"</tr>\";
    echo <<<EOB
      </tbody></table>
      </div><hr/>
EOB;
  break;
  case 5: // item delete
    if (!isset($_GET[\'key\']) || !isset($_GET[\'server\'])){
      echo \"No key set!\";
      break;
    }
    $theKey = htmlentities(base64_decode($_GET[\'key\']));
    $theserver = $MEMCACHE_SERVERS[(int)$_GET[\'server\']];
    list($h,$p) = explode(\':\',$theserver);
    $r = sendMemcacheCommand($h,$p,\'delete \'.$theKey);
    echo \'Deleting \'.$theKey.\':\'.$r;
  break;

  case 6: // flush server
    $theserver = $MEMCACHE_SERVERS[(int)$_GET[\'server\']];
    $r = flushServer($theserver);
    echo \'Flush \'.$theserver.\":\".$r;
  break;
}
echo getFooter();

?>

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THE END