revert last srv commit so svn is usable

src/common/xmpp/transports.py

@@ -33,13 +33,9 @@
 from protocol import *
 
 try:
-    import DNS, random
-    DNS.ParseResolvConf()
-    HAVE_DNS = True
+    import dns.resolver
 except:
-    HAVE_DNS = False
-    self.DEBUG("Warning: cannot perform SRV queries because 'dns' module is unavailable", 'warn')
-
+    pass
 
 DATA_RECEIVED='DATA RECEIVED'
 DATA_SENT='DATA SENT'
@@ -64,23 +60,19 @@ def __init__(self, server=None):
         self._exported_methods=[self.send,self.disconnect]
 
         # SRV resolver
-        if HAVE_DNS : # if dnspython is available support SRV
+        if 'dns' in globals(): # if dnspython is available support SRV
             host, port = server
             possible_queries = ['_xmpp-client._tcp.' + host]
 
-            dnsrequest = DNS.Request()
             for query in possible_queries:
                 try:
-                    response = dnsrequest.req(query, qtype='SRV')
-                    answers = [x for x in response.answers]
+                    answers = [x for x in dns.resolver.query(query, 'SRV')]
                     if answers:
-                        # extract the data from a random SRV RR
-                        rr = random.choice(answers)
-                        _, _, port, host = rr['data']
-                        port = int(port)
+                        host = str (answers[0].target)
+                        port = int (answers[0].port)
                         break
-                except DNS.DNSError, err :
-                    self.DEBUG("An error occurred querying SRV record for %s" % query, 'warn')
+                except:
+                    pass
 
             server = (host, port)
         # end of SRV resolver