viewfeed: rate limit ccache_update

diff --git a/backend.php b/backend.php
index 1e60e392d0445f5826e22b206c7c907b122438da..210de06f9e9fe44123381475316305135d73a481 100644 (file)
--- 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);