prosody
5f992ddc9685
net/adns.lua

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net/adns.lua @ 1208:5f992ddc9685

Add log message when DNS lookup is cancelled
author Matthew Wild <mwild1@gmail.com>
date Thu, 28 May 2009 02:17:19 +0100
parent 1207:6842bacddfcb
child 1522:569d58d21612
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4fd5d8f1657c net.adns: Add helper module for performing non-blocking DNS lookups
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1 local server = require "net.server";
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642af1bdf74e net.adns: Load the correct dns lib
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2 local dns = require "net.dns";
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3
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4 local log = require "util.logger".init("adns");
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5
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6 local coroutine, tostring, pcall = coroutine, tostring, pcall;
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7
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8 module "adns"
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9
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10 function lookup(handler, qname, qtype, qclass)
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11 return coroutine.wrap(function (peek)
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12 if peek then
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13 log("debug", "Records for %s already cached, using those...", qname);
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14 handler(peek);
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15 return;
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16 end
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17 log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running()));
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18 dns.query(qname, qtype, qclass);
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19 coroutine.yield({ qclass or "IN", qtype or "A", qname, coroutine.running()}); -- Wait for reply
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20 log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running()));
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21 local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
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22 if not ok then
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23 log("debug", "Error in DNS response handler: %s", tostring(err));
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24 end
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25 end)(dns.peek(qname, qtype, qclass));
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26 end
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27
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28 function cancel(handle, call_handler)
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29 log("warn", "Cancelling DNS lookup for %s", tostring(handle[3]));
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30 dns.cancel(handle);
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31 if call_handler then
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6842bacddfcb net.adns: Fix for calling handler when cancelling DNS lookup
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32 coroutine.resume(handle[4]);
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33 end
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34 end
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35
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36 function new_async_socket(sock)
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37 local newconn = {};
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38 local listener = {};
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39 function listener.incoming(conn, data)
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40 dns.feed(sock, data);
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41 end
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42 function listener.disconnect()
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43 end
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44 newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);
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45 newconn.handler.settimeout = function () end
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46 newconn.handler.setsockname = function (_, ...) return sock:setsockname(...); end
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96de7f0a41cc net.adns: Set new send in net.server after 'connecting UDP' socket
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47 newconn.handler.setpeername = function (_, ...) local ret = sock:setpeername(...); _.setsend(sock.send); return ret; end
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48 newconn.handler.connect = function (_, ...) return sock:connect(...) end
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49 newconn.handler.send = function (_, data) _.write(data); return _.sendbuffer(); end
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50 return newconn.handler;
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51 end
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52
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53 dns:socket_wrapper_set(new_async_socket);
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24018ba2f7c0 net.adns: Return _M
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54
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55 return _M;