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<?php
/**
* Class used to cache gallery HTML output to save requests to the database
* Date: 20/03/2017
*/
if ( ! class_exists( 'FooGallery_Cache' ) ) {
class FooGallery_Cache {
function __construct() {
if ( is_admin() ) {
//intercept the gallery save and save the html output to post meta
add_action( 'foogallery_after_save_gallery', array( $this, 'cache_gallery_html_output_after_save' ), 10, 2 );
//add some settings to allow the clearing and disabling of the cache
add_filter( 'foogallery_admin_settings_override', array( $this, 'add_cache_settings' ) );
//render the clear HTML cache button
add_action( 'foogallery_admin_settings_custom_type_render_setting', array( $this, 'render_settings' ) );
// Ajax call for clearing HTML cache
add_action( 'wp_ajax_foogallery_clear_html_cache', array( $this, 'ajax_clear_all_caches' ) );
add_action( 'foogallery_admin_new_version_detected', array( $this, 'clear_cache_on_update' ) );
//clear the gallery caches when settings are updated or reset
add_action( 'foogallery_settings_updated', array( $this, 'clear_all_gallery_caches' ) );
add_action( 'foogallery_settings_reset', array( $this, 'clear_all_gallery_caches' ) );
}
add_filter( 'foogallery_load_gallery_template', array( $this, 'fetch_gallery_html_from_cache' ), 10, 3 );
add_filter( 'foogallery_html_cache_disabled', array( $this, 'disable_html_cache' ), 10, 3 );
add_filter( 'foogallery_render_template_clear_globals' , array( $this, 'render_template_clear_globals' ) );
}
/**
* Override if the gallery html cache is disabled
*
* @param $disabled bool
* @param $gallery FooGallery
* @return bool
*/
function disable_html_cache( $disabled, $gallery ) {
//check if the gallery sorting is random
if ( 'rand' === $gallery->sorting ) {
$disabled = true;
}
return $disabled;
}
/**
* Save the HTML output of the gallery after the gallery has been saved
*
* @param $post_id
* @param $form_post
*/
function cache_gallery_html_output_after_save( $post_id, $form_post ) {
$this->cache_gallery_html_output( $post_id );
}
/**
* Save the HTML output of the gallery to post meta so that it can be used in future requests
*
* @param $foogallery_id
*/
function cache_gallery_html_output( $foogallery_id ) {
$caching_enabled = $this->is_caching_enabled();
//check if caching is disabled and quit early
if ( !$caching_enabled ) {
return;
}
//we need a way to force the gallery to render it's output every time it is saved
global $foogallery_force_gallery_cache;
$foogallery_force_gallery_cache = true;
//capture the html output
ob_start();
foogallery_render_gallery( $foogallery_id );
$gallery_html = ob_get_contents();
ob_end_clean();
if ( $caching_enabled ) {
//save the output to post meta for later use
update_post_meta( $foogallery_id, FOOGALLERY_META_CACHE, $gallery_html );
}
$foogallery_force_gallery_cache = false;
}
function is_caching_enabled() {
global $current_foogallery_arguments;
//do some checks if we are using arguments
if ( isset( $current_foogallery_arguments ) ) {
//never cache if showing a preview
if ( array_key_exists( 'preview', $current_foogallery_arguments ) &&
true === $current_foogallery_arguments['preview'] ) {
return false;
}
//never cache if we are passing in extra arguments via the shortcode
$array_keys = array_keys( $current_foogallery_arguments );
if ( $array_keys != array( 'id', 'gallery' ) ) {
return false;
}
}
//next, check the settings
if ( 'on' === foogallery_get_setting( 'enable_html_cache' ) ) {
return true;
}
return false;
}
/**
* Override the template output
*
* @param $override
* @param $gallery
* @param $template_location
*
* @return bool
*/
function fetch_gallery_html_from_cache( $override, $gallery, $template_location ) {
global $foogallery_force_gallery_cache;
if ( $foogallery_force_gallery_cache ) {
return false;
}
//check if caching is disabled and quit early
if ( !$this->is_caching_enabled() ) {
return false;
}
//allow extensions of others disable the html cache
if ( apply_filters( 'foogallery_html_cache_disabled', false, $gallery ) ) {
return false;
}
$gallery_cache = get_post_meta( $gallery->ID, FOOGALLERY_META_CACHE, true );
if ( !empty( $gallery_cache ) && is_string( $gallery_cache ) ) {
//output the cached gallery html
echo $gallery_cache;
return true; //return that we will override
} else {
//we should cache the result for next time
$this->cache_gallery_html_output( $gallery->ID );
}
return false;
}
/**
* Add some caching settings
* @param $settings
*
* @return array
*/
function add_cache_settings( $settings ) {
$cache_settings[] = array(
'id' => 'enable_html_cache',
'title' => __( 'Enable HTML Cache', 'foogallery' ),
'desc' => __( 'The gallery HTML that is generated can be cached. This can reduce the number of calls to the database when displaying a gallery and can increase site performance.', 'foogallery' ),
'type' => 'checkbox',
'tab' => 'general',
'section' => __( 'Cache', 'foogallery' )
);
$cache_settings[] = array(
'id' => 'clear_html_cache',
'title' => __( 'Clear HTML Cache', 'foogallery' ),
'desc' => __( 'If you enable the HTML cache, then you can use this button to clear the gallery HTML that has been cached for all galleries.', 'foogallery' ),
'type' => 'clear_gallery_cache_button',
'tab' => 'general',
'section' => __( 'Cache', 'foogallery' )
);
$new_settings = array_merge( $cache_settings, $settings['settings'] );
$settings['settings'] = $new_settings;
return $settings;
}
/**
* Render any custom setting types to the settings page
*/
function render_settings( $args ) {
if ('clear_gallery_cache_button' === $args['type'] ) { ?>
<div id="foogallery_clear_html_cache_container">
<input type="button" data-nonce="<?php echo esc_attr( wp_create_nonce( 'foogallery_clear_html_cache' ) ); ?>" class="button-primary foogallery_clear_html_cache" value="<?php _e( 'Clear Gallery HTML Cache', 'foogallery' ); ?>">
<span id="foogallery_clear_html_cache_spinner" style="position: absolute" class="spinner"></span>
</div>
<?php }
}
/**
* AJAX endpoint for clearing all gallery caches
*/
function ajax_clear_all_caches() {
if ( check_admin_referer( 'foogallery_clear_html_cache' ) ) {
$this->clear_all_gallery_caches();
_e('The cache for all galleries has been cleared!', 'foogallery' );
die();
}
}
/**
* Clears all caches for all galleries
*/
function clear_all_gallery_caches() {
delete_post_meta_by_key( FOOGALLERY_META_CACHE );
}
/**
* Clear all caches when the plugin has been updated. This is to account for changes in the HTML when a new version is released.
*/
function clear_cache_on_update() {
$this->clear_all_gallery_caches();
}
/**
* Determine if the globals should be cleared when rendering a gallery
*
* @param $clear
*
* @return bool
*/
function render_template_clear_globals( $clear ) {
global $foogallery_force_gallery_cache;
if ( $foogallery_force_gallery_cache ) {
return false;
}
return $clear;
}
}
}