mirror of https://github.com/BOINC/boinc.git
322 lines
9.4 KiB
PHP
322 lines
9.4 KiB
PHP
<?php
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// This file is part of BOINC.
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// http://boinc.berkeley.edu
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// Copyright (C) 2008 University of California
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//
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// BOINC is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// BOINC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
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require_once("../project/cache_parameters.inc");
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// If we can't see request headers, don't do caching
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//
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$no_cache = false;
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if (!function_exists("apache_request_headers")) {
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$no_cache = true;
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}
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// mechanism for caching commonly-accessed pages
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function make_cache_dirs() {
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if (!@filemtime("../cache")) {
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mkdir("../cache", 0770);
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chmod("../cache", 0770);
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}
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for ($i=0;$i<256;$i++) {
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$j=sprintf("%02x",$i);
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if (!@filemtime("../cache/$j")) {
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mkdir("../cache/$j", 0770);
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chmod("../cache/$j", 0770);
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}
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}
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}
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function get_path($params, $phpfile=null) {
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if (!@filemtime("../cache/00")) make_cache_dirs();
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if ($phpfile) {
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$z = $phpfile;
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} else {
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$y = pathinfo($_SERVER["PHP_SELF"]);
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$z = $y["basename"];
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}
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// add a layer of subdirectories for reducing file lookup time
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$sz = substr(md5($z."_".urlencode($params)),1,2);
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$path = "../cache/".$sz."/".$z;
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if ($params) {
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$path = $path."_".urlencode($params);
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}
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return $path;
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}
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function disk_usage($dir) {
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$usage=0;
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if ($handle=@opendir($dir)) {
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while ($file=readdir($handle)) {
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if (($file != ".") && ($file != "..")) {
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if (@is_dir($dir."/".$file)) {
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$usage+=disk_usage($dir."/".$file);
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} else {
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$usage+=@filesize($dir."/".$file);
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}
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}
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}
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@closedir($handle);
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}
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return $usage;
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}
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function clean_cache($max_age, $dir) {
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$start_dir = getcwd();
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if (!chdir($dir)) {
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return;
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}
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if ($handle=@opendir(".")) {
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while ($file=readdir($handle)) {
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if ($file == ".") continue;
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if ($file == "..") continue;
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// don't let hackers trick us into deleting other files!
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if (strstr($file, "..")) {
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continue;
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}
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if (@is_dir($file)) {
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clean_cache($max_age, $file);
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} else {
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if ((time()-@filemtime($file))>$max_age) {
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//echo "unlinking ".getcwd()."/$file\n";
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@unlink($file);
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}
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}
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}
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@closedir($handle);
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}
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chdir($start_dir);
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}
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// check free disk space every once in a while
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function cache_check_diskspace(){
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if (!(rand() % CACHE_SIZE_CHECK_FREQ)) {
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set_time_limit(0); // this may take a while
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$max_age = 86400;
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while ((disk_free_space("../cache") < MIN_FREE_SPACE) ||
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(disk_usage("../cache") > MAX_CACHE_USAGE)
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) {
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clean_cache($max_age, "../cache");
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$max_age/=2;
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}
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}
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}
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function cache_need_to_regenerate($path, $max_age){
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$regenerate = false;
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$request = apache_request_headers();
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clearstatcache();
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$lastmodified = @filemtime($path);
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if ($lastmodified) {
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// Check to see if this is a conditional fetch.
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//
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$if_modified_since = isset($request['If-Modified-Since']) ?
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(explode(';',$request['If-Modified-Since'])) : false;
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if ($if_modified_since) {
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$if_modified_since=strtotime($if_modified_since[0]);
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}
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if ($if_modified_since && ($if_modified_since == $lastmodified)) {
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Header("Last-Modified: " . gmdate("D, d M Y H:i:s",$lastmodified) . " GMT");
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Header('HTTP/1.0 304 Not Modified');
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exit;
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}
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// See if cached copy is too old.
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// If so regenerate,
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// and touch the cached copy so other processes
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// don't regenerate at the same time
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//
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if ($lastmodified<time()-$max_age) {
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$regenerate = true;
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@touch($path);
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}
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} else {
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$regenerate = true;
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}
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return $regenerate;
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}
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// Returns cached data or false if nothing was found
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function get_cached_data($max_age, $params=""){
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global $no_cache;
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if ($no_cache) return;
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$path = get_path($params);
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if ($max_age) {
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if (defined('MEMCACHE_SERVERS')) {
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$cache = BoincMemcache::get()->get($path);
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if ($cache['content']) {
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return $cache['content'];
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} else {
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return $cache;
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}
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} else {
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cache_check_diskspace();
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$regenerate=cache_need_to_regenerate($path, $max_age);
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if (!$regenerate) {
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return file_get_contents($path);
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}
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}
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}
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return false; //No data was cached, just return
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}
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// DEPRECATED
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function start_cache($max_age, $params=""){
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global $no_cache, $caching, $memcache;
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if ($no_cache) return;
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$caching = true;
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if ($max_age) {
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$path = get_path($params);
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if (defined('MEMCACHE_SERVERS')) {
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$cache = BoincMemcache::get()->get($path);
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if ($cache) {
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$regenerate = false;
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$lastmodified = abs($cache->timestamp);
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} else {
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$regenerate = true;
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}
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} else {
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$lastmodified = @filemtime($path);
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cache_check_diskspace(); //Check free disk space once in a while
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$regenerate = cache_need_to_regenerate($path, $max_age);
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}
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//Is the stored version too old, do we need to regenerate it?
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if ($regenerate){
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// If cached version is too old (or non-existent)
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// generate the page and write to cache
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//
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ob_start();
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ob_implicit_flush(0);
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Header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
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Header("Expires: " . gmdate("D, d M Y H:i:s",time()+$max_age) . " GMT");
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Header("Cache-Control: public, max-age=" . $max_age);
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// allow the calling page to see cache period
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//
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global $cached_max_age;
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$cached_max_age = $max_age;
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} else {
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// Otherwise serve the cached version and exit
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//
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if (strstr($params, "format=xml")) {
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header('Content-type: text/xml');
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}
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Header("Last-Modified: " . gmdate("D, d M Y H:i:s",$lastmodified) . " GMT");
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Header("Expires: " . gmdate("D, d M Y H:i:s",$lastmodified+$max_age) . " GMT");
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Header("Cache-Control: public, max-age=" . $max_age );
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if ($cache->content) {
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echo $cache->content;
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exit;
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}
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if (!@readfile($path)) {
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//echo "can't read $path; lastmod $lastmodified\n";
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@unlink($path);
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//Proceed to regenerate content
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} else {
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exit;
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}
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}
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}
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}
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// write output buffer both to client and to cache
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// DEPRECATED
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function end_cache($max_age,$params=""){
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global $no_cache;
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if ($no_cache) return;
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// for the benefit of hackers
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if (strstr($params, "..")) {
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return;
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}
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if ($max_age) {
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$path = get_path($params);
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if (defined('MEMCACHE_SERVERS')) {
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$cache = array('content' => ob_get_contents(), 'timestamp' => time());
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ob_end_flush();
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$cache = BoincMemcache::get()->set($path, $cache, $max_age);
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} else {
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$fhandle=fopen($path, "w");
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$page=ob_get_contents();
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ob_end_flush();
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fwrite($fhandle, $page);
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fclose($fhandle);
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}
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}
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}
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function set_cached_data($max_age, $data, $params=""){
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// for the benefit of hackers
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if (strstr($params, "..")) {
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return;
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}
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$path = get_path($params);
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if (defined('MEMCACHE_SERVERS')) {
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$cache = array('content' => $data, 'timestamp' => time());
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BoincMemcache::get()->set($path, $cache, $max_age);
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} else {
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$fhandle = fopen($path, "w");
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fwrite($fhandle, $data);
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fclose($fhandle);
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}
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}
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function clear_cache_entry($phpfile, $params) {
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if (strstr($phpfile, "..")) {
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return;
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}
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if (strstr($params, "..")) {
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return;
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}
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$path = get_path($params, $phpfile);
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@unlink($path);
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}
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// Memcached class
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class BoincMemcache {
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static $instance;
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static function get() {
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self::$instance = new Memcached;
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if (defined('MEMCACHE_PREFIX')) {
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self::$instance->setOption(Memcached::OPT_PREFIX_KEY, MEMCACHE_PREFIX);
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}
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$servers = explode('|', MEMCACHE_SERVERS);
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foreach($servers as &$server) {
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list($ip, $port) = explode(':', $server);
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if (!$port) { $port = 11211; }
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$server = array($ip, $port);
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}
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self::$instance->addServers($servers);
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return self::$instance;
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}
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}
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?>
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