From 92270410edaa467d71e841699805d6411ce047fa Mon Sep 17 00:00:00 2001
From: emanuele-f <faranda@ntop.org>
Date: Wed, 19 Sep 2018 17:45:20 +0200
Subject: [PATCH] Cache if_stats_ndpi timeseries query results

---
 scripts/lua/if_stats_ndpi.lua | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/scripts/lua/if_stats_ndpi.lua b/scripts/lua/if_stats_ndpi.lua
index 341f8ecc35..5c9881fe63 100644
--- a/scripts/lua/if_stats_ndpi.lua
+++ b/scripts/lua/if_stats_ndpi.lua
@@ -77,7 +77,17 @@ for _k in pairsByKeys(vals, asc) do
      end
   end
 
-  if(ts_utils.exists("iface:ndpi", {ifid=ifid, protocol=k})) then
+  local proto_cache_key = "ntopng.cache.has_ndpi_" .. ifid.."_".. k
+  local has_ndpi_proto = ntop.getCache(proto_cache_key)
+
+  if has_ndpi_proto ~= "1" then
+    if ts_utils.exists("iface:ndpi", {ifid=ifid, protocol=k}) then
+      has_ndpi_proto = "1"
+      ntop.setCache(proto_cache_key, "1", 300)
+    end
+  end
+
+  if(has_ndpi_proto == "1") then
      if(not(json_format)) then
 	print("<A HREF=\""..ntop.getHttpPrefix().."/lua/if_stats.lua?ifid=" .. ifid .. "&page=historical&ts_schema=iface:ndpi&protocol=".. k .."\">".. k .." "..formatBreed(ifstats["ndpi"][k]["breed"]).."</A>")
      else