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authorMatthew Wild <mwild1@gmail.com>2009-03-04 12:59:35 +0000
committerMatthew Wild <mwild1@gmail.com>2009-03-04 12:59:35 +0000
commitfb3b7ee05fc4ea42fab38eb3208b54600e4c85c4 (patch)
tree56cd7de09e858d80f802edf8a9f62cb69afacf35
parent775b18bd76bb0434214b0a92e1ec5d31d252cc26 (diff)
downloadprosody-fb3b7ee05fc4ea42fab38eb3208b54600e4c85c4.tar.gz
prosody-fb3b7ee05fc4ea42fab38eb3208b54600e4c85c4.zip
net.adns: Add helper module for performing non-blocking DNS lookups
-rw-r--r--net/adns.lua38
1 files changed, 38 insertions, 0 deletions
diff --git a/net/adns.lua b/net/adns.lua
new file mode 100644
index 00000000..fe35d2dd
--- /dev/null
+++ b/net/adns.lua
@@ -0,0 +1,38 @@
+local server = require "net.server";
+local dns = require "net.dns2";
+
+local log = require "util.logger".init("adns");
+
+local coroutine, tostring = coroutine, tostring;
+
+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()));
+ handler(dns.peek(qname, qtype, qclass));
+ 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 (_, ...) return sock:setpeername(...); end
+ newconn.handler.connect = function (_, ...) return sock:connect(...) end
+ newconn.handler.send = function (_, data) return _.write(data) end
+ return newconn.handler;
+end
+
+dns:socket_wrapper_set(new_async_socket);