prosody
4fd5d8f1657c
net/adns.lua

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net/adns.lua @ 870:4fd5d8f1657c

net.adns: Add helper module for performing non-blocking DNS lookups
author Matthew Wild <mwild1@gmail.com>
date Wed, 04 Mar 2009 12:59:35 +0000
child 871:642af1bdf74e
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869:09019c452709 870:4fd5d8f1657c
1 local server = require "net.server";
2 local dns = require "net.dns2";
3
4 local log = require "util.logger".init("adns");
5
6 local coroutine, tostring = coroutine, tostring;
7
8 module "adns"
9
10 function lookup(handler, qname, qtype, qclass)
11 return dns.peek(qname, qtype, qclass) or
12 coroutine.wrap(function ()
13 log("debug", "Records for "..qname.." not in cache, sending query (%s)...", tostring(coroutine.running()));
14 dns.query(qname, qtype, qclass);
15 coroutine.yield(nil); -- Wait for reply
16 log("debug", "Reply for "..qname.." (%s)", tostring(coroutine.running()));
17 handler(dns.peek(qname, qtype, qclass));
18 end)();
19 end
20
21 function new_async_socket(sock)
22 local newconn = {};
23 local listener = {};
24 function listener.incoming(conn, data)
25 dns.feed(sock, data);
26 end
27 function listener.disconnect()
28 end
29 newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);
30 newconn.handler.settimeout = function () end
31 newconn.handler.setsockname = function (_, ...) return sock:setsockname(...); end
32 newconn.handler.setpeername = function (_, ...) return sock:setpeername(...); end
33 newconn.handler.connect = function (_, ...) return sock:connect(...) end
34 newconn.handler.send = function (_, data) return _.write(data) end
35 return newconn.handler;
36 end
37
38 dns:socket_wrapper_set(new_async_socket);