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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
<?php
/*
* 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($$proxySite){
foreach($ds as $d){
$d=str_replace($accessSite, $proxySite,$d);
$clearUrls[]=$d;
}
}
scan_dir($cacheDir);
$cacheurls = array();
foreach($filedirs as $filename){
if(!is_file($filename)){
continue;
}
$cacheUrl=getUrlFromCacheFile($filename);
if(count($clearUrls)){
$cacheurls[]=$cacheUrl;
continue;
}
foreach($clearUrls as $clearUrl){
$clearUrl=str_replace($accessSite, $proxySite,$clearUrl);
$pos=strpos($cacheUrl,$clearUrl);
// echo "$cacheUrl,$clearUrl,$pos<br/>";
//比较http://www.b.com/a/b.jpg和http://www.b.com/a
if($pos===0){
$cacheurls[]=$cacheUrl;
break;
}
}
}
}else //清除一批URL
if($_POST["urls"]){
$accessSite=$_POST["accessSite"];
$proxySite=$proxySites[$accessSite];
$output.="<div style='font-size:16px;font-weight:bold'>执行结果
\n\n";
$urls=explode ("\n",$_POST["urls"]);
foreach($urls as $url2){
$url=trim($url2);
$output.="------------------------$url start-----------------------------\n";
$pos = strpos($url, $accessSite);
if ($pos !== false && $pos==0) {
$url=str_replace($accessSite, $proxySite,$url);
if(purge($proxyIp,$proxyPort,$url)==0){
$result[$url2]=0;
}else{
$result[$url2]=1;
}
}else{
$output.="skip $url\n";
$result[$url2]=-1;
}
$output.="------------------------$url end -----------------------------\n";
}
$output.="\n";
}else//清除某个目录下的所有文件
if($_POST["dirs"]){
$accessSite=$_POST["accessSite"];
$proxySite=$proxySites[$accessSite];
$clearUrls=array();
$clearUrls=explode ("\n",$_POST["dirs"]);
if($$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<br/>";
//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];
$output.="<div style='font-size:16px;font-weight:bold'>执行结果
\n\n";
foreach($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;
}
}
}
?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>刷新squid</title>
<body>
<?php
if($result){
echo "<table border='1'><tr><td>URL</td><td>结果</td></tr>\n";
foreach($result as $url=>$isOk){
switch($isOk){
case 0://成功
$r="<font style='color:#90EE90'>成功</font>";
break;
case 1://成功
$r="<font color='red'>失败</font>";
break;
case -1://跳过
$r="<font color='Yellow'>跳过</font>";
break;
}
if($$proxySite){
$url=str_replace($proxySite, $accessSite, $url);
}
echo "<tr><td>$url</td><td>$r</td></tr>\n";
}
echo "</table>\n";
}
?>
<form action="" method="post">
<table >
<tr><td>选择站点:</td></tr>
<tr><td>
<select name="accessSite" id="accessSite">
<?php
foreach($proxySites as $accessSite => $proxySite){
$isSelected=$_POST["accessSite"]==$accessSite?"selected":"";
echo "<option value='$accessSite' $isSelected>$accessSite</option>\n";
}
?>
</select>
<script>
function view(){
location="?accessSite="+document.getElementById("accessSite").value+"&view=1";
}
</script>
<input type="checkbox" name="view" value="1" <?php echo $_POST["view"]?"checked":"";?>/><label for="view">只查看</label>
</td></tr>
<tr><td>输入一组URL(一个一行):</td></tr>
<tr><td><textarea name="urls" style="width:1000px;height:200px;"><?php if($_POST["view"])foreach($cacheurls as $cacheurl){echo "$cacheurl\n";}?></textarea></td></tr>
<tr><td>刷新目录(一个一行):</td></tr>
<tr><td><textarea name="dirs" style="width:1000px;height:200px;"></textarea></td></tr>
<tr><td><input type="submit" value="提交" /></td></tr>
</table>
</form>
<?php
echo $output;
?>
</body></html>
<?php
//清除某个url
function purge($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