# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1528551303 -7200
# Node ID fcf42bd7d067c6dacddc5575a600f985fca323ce
# Parent  c72a6226ee31ffdee7b5a56c495ac6e51c2ee1e3
net.dns: Don't attempt to cache unparsed data (fixes #1056)

rr[qtype:lower()] can be nil. I think this happens if the type does not
have a parser.

Also see #819 #976

diff -r c72a6226ee31 -r fcf42bd7d067 net/dns.lua
--- a/net/dns.lua	Sat Jun 09 00:09:25 2018 +0200
+++ b/net/dns.lua	Sat Jun 09 15:35:03 2018 +0200
@@ -672,7 +672,7 @@
 	self.cache = self.cache or setmetatable({}, cache_metatable);
 	local rrs = get(self.cache, qclass, type, qname) or
 		set(self.cache, qclass, type, qname, setmetatable({}, rrs_metatable));
-	if not rrs[rr[qtype:lower()]] then
+	if rr[qtype:lower()] and not rrs[rr[qtype:lower()]] then
 		rrs[rr[qtype:lower()]] = true;
 		append(rrs, rr);
 	end