# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1538251007 -7200
# Node ID f2d71e4284b75ce2abe9035e72876762ef897e34
# Parent  4001eb3f465a06dae9e9845a18b5f061a26c86b0
net.resolvers.service: Understand when service is explicitly unavailable

RFC2782 states:
> A Target of "." means that the service is decidedly not available at
> this domain.

diff -r 4001eb3f465a -r f2d71e4284b7 net/resolvers/service.lua
--- a/net/resolvers/service.lua	Sat Sep 29 16:29:30 2018 +0200
+++ b/net/resolvers/service.lua	Sat Sep 29 21:56:47 2018 +0200
@@ -34,6 +34,11 @@
 	local dns_resolver = adns.resolver();
 	dns_resolver:lookup(function (answer)
 		if answer then
+			if #answer == 1 and answer[1].srv.target == "." then -- No service here
+				ready();
+				return;
+			end
+
 			table.sort(answer, function (a, b) return a.priority > b.priority end);
 			for _, record in ipairs(answer) do
 				table.insert(targets, { record.srv.target, record.srv.port, self.conn_type, self.extra });