基于Nginx的Mencached缓存配置详解

[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

#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

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

[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.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;
    }
  }
}

#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:../'."\r\n");
  }
?>

#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

<?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();

?>