prosody
09a4cd461673
net/adns.lua

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net/adns.lua @ 1173:09a4cd461673

modulemanager: Don't close the stream on unhandled stream:features
author Waqas Hussain <waqas20@gmail.com>
date Sat, 16 May 2009 05:07:51 +0500
parent 1005:0eed5db7758d
child 1203:23725bfdeed5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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4fd5d8f1657c net.adns: Add helper module for performing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
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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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b091a1a7273b net.adns: Catch errors in DNS response callbacks
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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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0eed5db7758d net.adns: Call handler for records already cached
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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(nil); -- Wait for reply
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0eed5db7758d net.adns: Call handler for records already cached
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20 log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running()));
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b091a1a7273b net.adns: Catch errors in DNS response callbacks
Matthew Wild <mwild1@gmail.com>
parents: 886
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21 local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
b091a1a7273b net.adns: Catch errors in DNS response callbacks
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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 new_async_socket(sock)
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29 local newconn = {};
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30 local listener = {};
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31 function listener.incoming(conn, data)
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32 dns.feed(sock, data);
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33 end
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34 function listener.disconnect()
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35 end
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36 newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);
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37 newconn.handler.settimeout = function () end
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38 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
Matthew Wild <mwild1@gmail.com>
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39 newconn.handler.setpeername = function (_, ...) local ret = sock:setpeername(...); _.setsend(sock.send); return ret; end
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40 newconn.handler.connect = function (_, ...) return sock:connect(...) end
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b52d442161f2 net.adns: Flush buffer after sending DNS request
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41 newconn.handler.send = function (_, data) _.write(data); return _.sendbuffer(); end
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42 return newconn.handler;
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43 end
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44
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45 dns:socket_wrapper_set(new_async_socket);
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24018ba2f7c0 net.adns: Return _M
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46
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47 return _M;