From 99c86dcf3c5e0deb472365c128939fa0be0bca01 Mon Sep 17 00:00:00 2001
From: djmaze <djmaze@djmaze.lan>
Date: Sat, 8 Aug 2020 22:33:12 +0200
Subject: [PATCH] Prevent server overload based on 1 minute system load average
 over 95% https://www.php.net/sys_getloadavg

---
 rainloop/v/0.0.0/include.php | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/rainloop/v/0.0.0/include.php b/rainloop/v/0.0.0/include.php
index ecf96ae7e..ed8aa74a8 100644
--- a/rainloop/v/0.0.0/include.php
+++ b/rainloop/v/0.0.0/include.php
@@ -4,6 +4,16 @@
 	{
 		if (!defined('APP_REQUEST_RND'))
 		{
+			if (function_exists('sys_getloadavg')) {
+				$load = sys_getloadavg();
+				if ($load[0] > 95) {
+					header('HTTP/1.1 503 Service Unavailable');
+					header('Retry-After: 120');
+					exit('Mailserver too busy. Please try again later.');
+				}
+				unset($load);
+			}
+
 			ini_set('register_globals', 0);
 			ini_set('zend.ze1_compatibility_mode', 0);
 
@@ -15,10 +25,7 @@
 			// "img-src https:" is allowed due to remote images in e-mails
 			define('APP_DEFAULT_CSP', "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; img-src 'self' data: https:; style-src 'self' 'unsafe-inline'");
 
-			if (function_exists('date_default_timezone_set'))
-			{
-				date_default_timezone_set('UTC');
-			}
+			date_default_timezone_set('UTC');
 
 			$sSite = strtolower(trim(empty($_SERVER['HTTP_HOST']) ? (empty($_SERVER['SERVER_NAME']) ? '' : $_SERVER['SERVER_NAME']) : $_SERVER['HTTP_HOST']));
 			$sSite = 'www.' === substr($sSite, 0, 4) ? substr($sSite, 4) : $sSite;