BIND 10 #1299: ccompare SOA serial in xfrin

[BIND 10 Development]

#1299: ccompare SOA serial in xfrin
-------------------------------------+-------------------------------------
            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  blocker       |                    Milestone:  Next-
           Component:  xfrin         |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 This is another follow-up task for #1261.  This one depends on #1278.

 We need to complete this part of xfrin.

 {{{
 class XfrinInitialSOA(XfrinState):
     def handle_rr(self, conn, rr):
 [...]
         # FIXME: we need to check the serial is actually greater than
 ours.
         # To do so, however, we need to implement serial number
 arithmetic.
         # Although it wouldn't be a big task, we'll leave it for a
 separate
         # task for now.  (Always performing xfr could be inefficient, but
         # shouldn't do any harm otherwise)
 }}}

 We also need to complete this part (although technically it's not a
 follow-up for #1261):

 {{{
     def _check_soa_serial(self):
 [...]
         # TODO, need select soa record from data source then compare the
 two
         # serial, current just return OK, since this function hasn't been
 used
         # now.
         return XFRIN_OK
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/1299>
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