WP Rocket Cache Purge / Invalidation with GCP Cloud CDN - Load Balancer

wp-rocket-cache-gcp-cloud-cdn-invalidation.php

<?php

// Make sure that you have gcloud installed on server, and is accesible with the proper permissions to httpd/apache/ngix

// Update this variable with the GCP Cloud CDN Load Balancer name, or set it via filter: gcp_cloud_cdn_urlmap
define( 'GCP_CLOUD_CDN_URLMAP', 'your-load-balancer-id-goes-here' );

add_action( 'after_rocket_clean_home', 'gcp_cloud_cdn_invalidate_cdn_cache_home', 100 );
add_action( 'after_rocket_clean_domain', 'gcp_cloud_cdn_invalidate_cdn_cache_domain', 100 );
add_action( 'after_rocket_clean_cache_dir', 'gcp_cloud_cdn_invalidate_cdn_cache', 100 );
add_action( 'after_rocket_clean_file', 'gcp_cloud_cdn_invalidate_cdn_cache', 100 );

function gcp_cloud_cdn_invalidate_cdn_cache_domain() {
	gcp_cloud_cdn_invalidate_cdn_cache( '/*' );
}
function gcp_cloud_cdn_invalidate_cdn_cache_home() {
	gcp_cloud_cdn_invalidate_cdn_cache( '/' );
}
function gcp_cloud_cdn_invalidate_cdn_cache( $param = null ) {
	$urlmap = apply_filters( 'gcp_cloud_cdn_urlmap', defined( 'GCP_CLOUD_CDN_URLMAP' ) ? GCP_CLOUD_CDN_URLMAP : null );
	if ( !$urlmap ) return;
	$parts = parse_url( site_url() );
	$domain = apply_filters( 'gcp_cloud_cdn_urlmap_domain', $parts[ 'host' ] );
	$paths = [];
	if ( is_array( $param ) ) {
		foreach( $param as $path ) $paths[] = str_replace( site_url(), '', $path );
	} else if ( $param ) {
		$paths[] = str_replace( site_url(), '', $param );
	}
	foreach ( $paths as $path ) {
		$clean = 'gcloud compute url-maps invalidate-cdn-cache ' . $urlmap . ' --async --host "' . $domain . '" --path "' . $path . '"  > /dev/null &';
		exec( $clean );
	}
}

This script is intended to resolve issues when you use WP-Rocket behind a GCP Cloud CDN (using Load Balancer) and require to purge the cached files from the CDN.

WP-Rocket doesn't support the GCP Cloud CDN yet, and unfortunately, the GCP Cloud CDN invalidate doesn't support API so only a gcloud command works at the moment, so it is required to have it on the VMs with sufficient permission to the apache/httpd user.