forked from BenjaminAdams/wp-redis-cache
/
index-wp-redis.php
189 lines (162 loc) · 6.32 KB
/
index-wp-redis.php
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<?php
// Start the timer so we can track the page load time
$start = microtime();
function getMicroTime($time) {
list($usec, $sec) = explode(" ", $time);
return ((float) $usec + (float) $sec);
}
function refreshHasSecret($secret) {
return isset($_GET['refresh']) && $_GET['refresh'] == $secret;
}
function requestHasSecret($secret) {
return strpos($_SERVER['REQUEST_URI'],"refresh=${secret}")!==false;
}
function isRemotePageLoad($currentUrl, $websiteIp) {
return (isset($_SERVER['HTTP_REFERER'])
&& $_SERVER['HTTP_REFERER']== $currentUrl
&& $_SERVER['REQUEST_URI'] != '/'
&& $_SERVER['REMOTE_ADDR'] != $websiteIp);
}
function handleCDNRemoteAddressing() {
// so we don't confuse the cloudflare server
if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
}
}
function getCleanUrl($secret) {
$replaceKeys = array("?refresh=${secret}","&refresh=${secret}");
$url = "http://${_SERVER['HTTP_HOST']}${_SERVER['REQUEST_URI']}";
$current_url = str_replace($replaceKeys, '', $url);
return $current_url;
}
$wp_blog_header_path = dirname( __FILE__ ) . '/wp-blog-header.php';
$debug = true;
$cache = true;
$compress = true;
$unlimited = true;
$websiteIp = '127.0.0.1';
// if you use sockets, set this to true and use $redis_server for socket path
$sockets = false;
// in case of sockets something like /home/user/.redis/sock
$redis_server = 'raven.internal.wildwingstudios.com';
$secret_string = 'changeme';
$current_url = getCleanUrl($secret_string);
// used to prefix ssl cached pages
$isSSL = ((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') || $_SERVER['SERVER_PORT'] == 443) ? "ssl_" : "";
$redis_key = $isSSL.md5($current_url);
handleCDNRemoteAddressing();
if(!defined('WP_USE_THEMES')) {
define('WP_USE_THEMES', true);
}
try {
if ($_SERVER['REQUEST_METHOD']=='GET'){
// check if PECL Extension is available
if (class_exists('Redis')) {
if ($debug) {
#echo "<!-- Redis PECL module found -->\n";
}
$redis = new Redis();
// Sockets can be used as well. Documentation @ https://github.com/nicolasff/phpredis/#connection
$redis->connect($redis_server);
} else { // Fallback to predis5.2.php
if ($debug) {
echo "<!-- using predis as a backup -->\n";
}
include_once(dirname($wp_blog_header_path)."/wp-content/plugins/wp-redis-cache/predis5.2.php"); //we need this to use Redis inside of PHP
// try the client first
try {
if ($sockets) {
$redis = new Predis_Client(array(
'scheme' => 'unix',
'path' => $redis_server
));
} else {
$redis = new Predis_Client();
}
} catch (Predis_ClientException $e) { // catch predis-thrown exception
die("Predis not found on your server or was unable to run. Error message: " . $e->getMessage());
} catch (Exception $e) { // catch other exceptions
require( $wp_blog_header_path );
die("Error occurred. Error message: " . $e->getMessage());
}
}
//Either manual refresh cache by adding ?refresh=secret_string after the URL or somebody posting a comment
if (refreshHasSecret($secret_string) || requestHasSecret($secret_string) || isRemotePageLoad($current_url, $websiteIp)) {
if ($debug) {
echo "<!-- manual refresh was required -->\n";
}
$redis->del($redis_key);
$redis->del("ssl_".$redis_key);
require( $wp_blog_header_path );
//$unlimited = get_option('wp-redis-cache-debug',false);
$seconds_cache_redis = get_option('wp-redis-cache-seconds',86400);
// This page is cached, lets display it
} else if ($redis->exists($redis_key)) {
if ($debug) {
echo "<!-- serving page from cache: key: $redis_key -->\n";
}
$cache = true;
$html_of_page = $redis->get($redis_key);
if ($compress) {
$html_of_page = gzuncompress($html_of_page);
}
echo $html_of_page;
// If the cache does not exist lets display the user the normal page without cache, and then fetch a new cache page
} else if ($_SERVER['REMOTE_ADDR'] != $websiteIp && strstr($current_url, 'preview=true') == false) {
if ($debug) {
echo "<!-- displaying page without cache -->\n";
}
$isPOST = ($_SERVER['REQUEST_METHOD'] === 'POST') ? 1 : 0;
$loggedIn = preg_match("/wordpress_logged_in/", var_export($_COOKIE, true));
if (!$isPOST && !$loggedIn) {
ob_start();
$level = ob_get_level();
require( $wp_blog_header_path );
while(ob_get_level() > $level) ob_end_flush();
$html_of_page = ob_get_clean(); // ob_get_clean also closes the OB
echo $html_of_page;
if (!is_numeric($seconds_cache_redis)) {
$seconds_cache_redis = 86400;
}
if ($compress) {
$html_of_page = gzcompress($html_of_page,1);
}
// When a page displays after an "HTTP 404: Not Found" error occurs, do not cache
// When the search was used, do not cache
if ((!is_404()) and (!is_search())) {
if ($unlimited) {
$redis->set($redis_key, $html_of_page);
} else {
$redis->setex($redis_key, $seconds_cache_redis, $html_of_page);
}
}
} else { //either the user is logged in, or is posting a comment, show them uncached
require( $wp_blog_header_path );
}
} else if ($_SERVER['REMOTE_ADDR'] != $websiteIp && strstr($current_url, 'preview=true') == true) {
require( $wp_blog_header_path );
}
// else { // This is what your server should get if no cache exists //deprecated, as the ob_start() is cleaner
//require( $wp_blog_header_path );
// }
} else {
require( $wp_blog_header_path );
}
} catch (Exception $e) {
require( $wp_blog_header_path );
echo "<!-- Something went wrong: " . $e->getMessage()."-->";
}
if ($debug) {
$end = microtime();
$time = (@getMicroTime($end) - @getMicroTime($start));
echo "<!-- Page generated in " . round($time, 5) . " seconds. -->\n";
echo "<!-- Site was cached = " . $cache . " -->\n";
if (isset($seconds_cache_redis)) {
echo "<!-- wp-redis-cache-seconds = " . $seconds_cache_redis . " -->\n";
}
echo "<!-- wp-redis-cache-ip = " . $websiteIp . "-->\n";
if (isset($unlimited)) {
echo "<!-- wp-redis-cache-unlimited = " . $unlimited . "-->\n";
}
echo "<!-- wp-redis-cache-debug = " . $debug . "-->\n";
}