From 0b9bab255c920ec3e67a1e36e92dd14b5a774dc7 Mon Sep 17 00:00:00 2001
From: Matthias Radestock <matthias.radestock@gmail.com>
Date: Sat, 4 Nov 2017 22:24:46 +0000
Subject: [PATCH] memoise top-level rendering

This deals with browsers requesting the same rendering for the same
timespan when no new reports have been received for that timespan.
---
 app/api_topologies.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/app/api_topologies.go b/app/api_topologies.go
index 92e4e3d11..848a1c1c8 100644
--- a/app/api_topologies.go
+++ b/app/api_topologies.go
@@ -435,6 +435,7 @@ func (r *Registry) Add(ts ...APITopologyDesc) {
 	defer r.Unlock()
 	for _, t := range ts {
 		t.URL = apiTopologyURL + t.id
+		t.renderer = render.Memoise(t.renderer)
 
 		if t.parent != "" {
 			parent := r.items[t.parent]