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lukecav/functions.php

Created December 20, 2017 22:08
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Fix a race condition in alloptions caching in WordPress
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functions.php
/**
* Fix a race condition in alloptions caching
*
* See https://core.trac.wordpress.org/ticket/31245
*/
function _wpcom_vip_maybe_clear_alloptions_cache( $option ) {
if ( ! wp_installing() ) {
$alloptions = wp_load_alloptions(); //alloptions should be cached at this point
if ( isset( $alloptions[ $option ] ) ) { //only if option is among alloptions
wp_cache_delete( 'alloptions', 'options' );
}
}
}
add_action( 'added_option', '_wpcom_vip_maybe_clear_alloptions_cache' );
add_action( 'updated_option', '_wpcom_vip_maybe_clear_alloptions_cache' );
add_action( 'deleted_option', '_wpcom_vip_maybe_clear_alloptions_cache' );
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lukecav commented Dec 20, 2017

rhubarbgroup/redis-cache#58
https://github.com/Automattic/vip-go-mu-plugins-built/blob/master/misc.php#L66-L83

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