From 34c30ac126cb1b00b36065b4dae705774c4e52b3 Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@madoka.spb.ru>
Date: Sat, 17 Jan 2009 18:27:37 +0100
Subject: viewfeed: rate limit ccache_update

---
 backend.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/backend.php b/backend.php
index 1e60e392d..210de06f9 100644
--- a/backend.php
+++ b/backend.php
@@ -273,8 +273,11 @@
 			/* Updating a label ccache means recalculating all of the caches
 			 * so for performance reasons we don't do that here */
 
-			if ($feed >= 0) {
-				ccache_update($link, $feed, $_SESSION["uid"], $cat_view);
+			if (time() - $_SESSION["viewfeed:ccache_update_stamp"] > 120) {
+				if ($feed >= 0) {
+					ccache_update($link, $feed, $_SESSION["uid"], $cat_view);
+				}
+				$_SESSION["viewfeed:ccache_update_stamp"] = time();
 			}
 
 			set_pref($link, "_DEFAULT_VIEW_MODE", $view_mode);
-- 
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