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Redis Page Cache
Commit 25ebf3a1 authored by Erick Hitter's avatar Erick Hitter
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Further simplification of the logic used to build and display caches. 

Currently broken (causes an error with $wpdb).
parent 1e5b1a79
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Showing with 76 additions and 52 deletions
index-wp-redis.php
View file @ 25ebf3a1
......@@ -155,6 +155,15 @@ function wp_redis_cache_connect_redis() {
return $redis;
}
/**
* Shortcut to load WP
*
* @return null
*/
function wp_redis_cache_load_wp() {
require_once dirname( __FILE__ ) . '/wp-blog-header.php';
}
/**
* BEGIN CACHING LOGIC
*/
......@@ -171,11 +180,19 @@ try {
// Establish connection with Redis server
$redis = wp_redis_cache_connect_redis();
// Whether we need to load WP
$load_wp = true;
// Relevant details on the current request
$is_post = (bool) 'POST' === $_SERVER['REQUEST_METHOD'];
$logged_in = (bool) preg_match( "#(wordpress_(logged|sec)|comment_author)#", var_export( $_COOKIE, true ) );
//Either manual refresh cache by adding ?refresh=secret_string after the URL or somebody posting a comment
if ( $GLOBALS['wp_redis_cache_config']['debug'] ) {
echo "<!-- POST request: . " . ( $is_post ? 'yes' : 'no' ) . "-->\n";
echo "<!-- Logged in: . " . ( $logged_in ? 'yes' : 'no' ) . "-->\n";
}
// Refresh request, deletes cache: either manual refresh cache by adding ?refresh=secret_string after the URL or somebody posting a comment
if ( wp_redis_cache_refresh_has_secret( $GLOBALS['wp_redis_cache_config']['secret_string'] ) || wp_redis_cache_request_has_secret( $GLOBALS['wp_redis_cache_config']['secret_string'] ) || wp_redis_cache_is_remote_page_load( $GLOBALS['wp_redis_cache_config']['current_url'], $GLOBALS['wp_redis_cache_config']['server_ip'] ) ) {
if ( $GLOBALS['wp_redis_cache_config']['debug'] ) {
echo "<!-- manual refresh was required -->\n";
......@@ -183,38 +200,39 @@ try {
$redis->del( $GLOBALS['wp_redis_cache_config']['redis_key'] );
require dirname( __FILE__ ) . '/wp-blog-header.php';
// This page is cached, lets display it
// wp_redis_cache_load_wp();
// This page is cached, the user isn't logged in, and it isn't a POST request, so let's use the cache
} elseif ( ! $is_post && ! $logged_in && $redis->exists( $GLOBALS['wp_redis_cache_config']['redis_key'] ) ) {
if ( $GLOBALS['wp_redis_cache_config']['debug'] ) {
echo "<!-- serving page from cache: key: " . $GLOBALS['wp_redis_cache_config']['redis_key'] . " -->\n";
}
// Page is served from cache, so we don't need WP
$load_wp = false;
$GLOBALS['wp_redis_cache_config']['cached'] = true;
$html_of_page = trim( $redis->get( $GLOBALS['wp_redis_cache_config']['redis_key'] ) );
echo $html_of_page;
echo trim( $redis->get( $GLOBALS['wp_redis_cache_config']['redis_key'] ) );
// If the cache does not exist lets display the user the normal page without cache, and then fetch a new cache page
} elseif ( $_SERVER['REMOTE_ADDR'] != $GLOBALS['wp_redis_cache_config']['server_ip'] && false === strstr( $GLOBALS['wp_redis_cache_config']['current_url'], 'preview=true' ) ) {
} elseif ( $_SERVER['REMOTE_ADDR'] != $GLOBALS['wp_redis_cache_config']['server_ip'] ) {
if ( false === strstr( $GLOBALS['wp_redis_cache_config']['current_url'], 'preview=true' ) ) {
if ( $GLOBALS['wp_redis_cache_config']['debug'] ) {
echo "<!-- displaying page without cache -->\n";
}
if ( $GLOBALS['wp_redis_cache_config']['debug'] ) {
echo "<!-- POST request: . " . ( $is_post ? 'yes' : 'no' ) . "-->\n";
echo "<!-- Logged in: . " . ( $logged_in ? 'yes' : 'no' ) . "-->\n";
}
// If user isn't logged in and this isn't a post request, render the requested page and cache if appropriate.
if ( ! $is_post && ! $logged_in ) {
// We load WP to generate the cached output, so no need to load again
$load_wp = false;
// Render page into an output buffer and display
ob_start();
require dirname( __FILE__ ) . '/wp-blog-header.php';
$html_of_page = trim( ob_get_clean() );
echo $html_of_page;
wp_redis_cache_load_wp();
$markup_to_cache = trim( ob_get_clean() );
echo $markup_to_cache;
// When a page displays after an "HTTP 404: Not Found" error occurs, do not cache
// When the search was used, do not cache
// Cache rendered page if appropriate
if ( ! is_404() && ! is_search() ) {
// Is unlimited cache life requested?
if ( isset( $GLOBALS['wp_redis_cache_config']['unlimited'] ) ) {
$unlimited = $GLOBALS['wp_redis_cache_config']['unlimited'];
} else {
......@@ -222,9 +240,9 @@ try {
$GLOBALS['wp_redis_cache_config']['unlimited'] = $unlimited;
}
// Determine how long to cache the page for and set the cache
// Cache the page for the chosen duration
if ( $unlimited ) {
$redis->set( $GLOBALS['wp_redis_cache_config']['redis_key'], $html_of_page );
$redis->set( $GLOBALS['wp_redis_cache_config']['redis_key'], $markup_to_cache );
} else {
if ( isset( $GLOBALS['wp_redis_cache_config']['cache_duration'] ) ) {
$cache_duration = $GLOBALS['wp_redis_cache_config']['cache_duration'];
......@@ -237,19 +255,25 @@ try {
$cache_duration = $GLOBALS['wp_redis_cache_config']['cache_duration'] = 43200;
}
$redis->setex( $GLOBALS['wp_redis_cache_config']['redis_key'], $cache_duration, $html_of_page );
$redis->setex( $GLOBALS['wp_redis_cache_config']['redis_key'], $cache_duration, $markup_to_cache );
}
}
} else { //either the user is logged in, or is posting a comment, show them uncached
require dirname( __FILE__ ) . '/wp-blog-header.php';
}
} elseif ( $_SERVER['REMOTE_ADDR'] != $GLOBALS['wp_redis_cache_config']['server_ip'] && true === strstr( $GLOBALS['wp_redis_cache_config']['current_url'], 'preview=true' ) ) {
require dirname( __FILE__ ) . '/wp-blog-header.php';
} else {
require dirname( __FILE__ ) . '/wp-blog-header.php';
} /*else {
wp_redis_cache_load_wp();
}*/
} /*else {
wp_redis_cache_load_wp();
}*/
} /*else {
wp_redis_cache_load_wp();
}*/
// The current request wasn't served from cache or isn't cacheable, so we pass off to WP
if ( $load_wp ) {
wp_redis_cache_load_wp();
}
} catch ( Exception $e ) {
require dirname( __FILE__ ) . '/wp-blog-header.php';
wp_redis_cache_load_wp();
wp_redis_cache_exception_handler( $e );
}
......
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