local server = require "net.server";

local dns = require "net.dns";

local log = require "util.logger".init("adns");

local coroutine, tostring, pcall = coroutine, tostring, pcall;

module "adns"

function lookup(handler, qname, qtype, qclass)

	return dns.peek(qname, qtype, qclass) or

		coroutine.wrap(function ()

				log("debug", "Records for "..qname.." not in cache, sending query (%s)...", tostring(coroutine.running()));

				dns.query(qname, qtype, qclass);

				coroutine.yield(nil); -- Wait for reply

				log("debug", "Reply for "..qname.." (%s)", tostring(coroutine.running()));

				local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));

				if not ok then

					log("debug", "Error in DNS response handler: %s", tostring(err));

				end

			end)();

end

function new_async_socket(sock)

	local newconn = {};

	local listener = {};

	function listener.incoming(conn, data)

		dns.feed(sock, data);

	end

	function listener.disconnect()

	end

	newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);

	newconn.handler.settimeout = function () end

	newconn.handler.setsockname = function (_, ...) return sock:setsockname(...); end

	newconn.handler.setpeername = function (_, ...) local ret = sock:setpeername(...); _.setsend(sock.send); return ret; end

	newconn.handler.connect = function (_, ...) return sock:connect(...) end	

	return newconn.handler;

end

dns:socket_wrapper_set(new_async_socket);

return _M;