基于Nginx的Mencached缓存配置详解

服务器 2024/11/15 佚名

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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 
<"text-align: center">


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"htmlcode">

#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 
<"\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






memcached监控文件


<"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+"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'])"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) "%.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) "%.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) "</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() "<td class=td-0><img alt=\"\" $size src=\"$PHP_SELF&IMG=1&".(isset($_GET['singleout'])"$time\"></td>".
       "<td class=td-1><img alt=\"\" $size src=\"$PHP_SELF&IMG=2&".(isset($_GET['singleout'])"$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)"<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();

?>