From e1227255d3b0c48c62fbcce37e8159263d9f2d10 Mon Sep 17 00:00:00 2001
From: Luis Henrique Mulinari <luis.henrique.mulinari@automattic.com>
Date: Mon, 14 Aug 2023 16:23:26 -0300
Subject: [PATCH] Code review suggestions

---
 security/user-last-seen.php | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/security/user-last-seen.php b/security/user-last-seen.php
index a8ee44c798..3c7eb3aca5 100644
--- a/security/user-last-seen.php
+++ b/security/user-last-seen.php
@@ -1,30 +1,28 @@
 <?php
 
-const LAST_SEEN_UPDATE_USER_META_CACHE_TTL = 60; // Store last seen once per minute to avoid too much write DB operations
-const LAST_SEEN_UPDATE_USER_META_CACHE_KEY_PREFIX = 'vip_last_seen_update_user_meta_cache_key';
+const LAST_SEEN_UPDATE_USER_META_CACHE_TTL = 60 * 5; // Store last seen once every five minute to avoid too many write DB operations
+const LAST_SEEN_UPDATE_USER_META_CACHE_KEY_PREFIX = 'wpvip_last_seen_update_user_meta_cache_key';
 
 add_action( 'set_current_user', 'update_user_last_seen', 10, 0 );
-add_filter('manage_users_columns', 'users_columns' ) ;
-add_filter('manage_users_custom_column', 'users_custom_column', 10, 3 ) ;
+add_filter( 'manage_users_columns', 'users_columns' ) ;
+add_filter( 'manage_users_custom_column', 'users_custom_column', 10, 3 ) ;
 
 function update_user_last_seen() {
 	global $current_user;
 
-	$cache_key = LAST_SEEN_UPDATE_USER_META_CACHE_KEY_PREFIX . $current_user->ID;
+	if ( ! $current_user->ID ) {
+		return;
+	}
 
-	try {
-		if ( wp_cache_get( $cache_key ) ) {
-			return;
-		}
+	$cache_key = LAST_SEEN_UPDATE_USER_META_CACHE_KEY_PREFIX . $current_user->ID;
 
-		update_user_meta( $current_user->ID, 'vip_last_seen', time() );
+	if ( wp_cache_get( $cache_key, 'wpvip' ) ) {
+		// Last seen meta was updated recently, no need to update it again
+		return;
+	}
 
-		wp_cache_set( $cache_key, true, null, LAST_SEEN_UPDATE_USER_META_CACHE_TTL );
-	} catch ( \Exception $e ) {
-		trigger_error(
-			sprintf( 'failed to update user last seen meta', esc_html( $e->getMessage() ) ),
-			E_USER_WARNING
-		);
+	if ( wp_cache_add( $cache_key, true, 'wpvip', LAST_SEEN_UPDATE_USER_META_CACHE_TTL ) ) {
+		update_user_meta( $current_user->ID, 'wpvip_last_seen', time() );
 	}
 }
 
@@ -35,7 +33,7 @@ function users_columns($cols) {
 
 function users_custom_column( $default, $column_name, $user_id ) {
 	if ( 'last_seen' == $column_name ) {
-		$last_seen_timestamp = get_user_meta( $user_id, 'vip_last_seen', true );
+		$last_seen_timestamp = get_user_meta( $user_id, 'wpvip_last_seen', true );
 
 		if ( $last_seen_timestamp ) {
 			$formatted_date = sprintf(