BIND 10 #1280: suggestion: record xfrin-session-statistics and log it

[BIND 10 Development]

#1280: suggestion: record xfrin-session-statistics and log it
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            Reporter:  jinmei        |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  major         |                    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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 I didn't go this further in #1261 (as the branch was getting
 bigger) but I actually wanted to improve xfrin log a bit.
 BIND 9 records some statistics information about each xfrin session
 and dumps it in a log message at the end of the session:

 {{{
         xfrin_log(xfr, ISC_LOG_INFO,
                   "Transfer completed: %d messages, %d records, "
                   "%" ISC_PRINT_QUADFORMAT "u bytes, "
                   "%u.%03u secs (%u bytes/sec)",
                   xfr->nmsg, xfr->nrecs, xfr->nbytes,
                   (unsigned int) (msecs / 1000), (unsigned int) (msecs %
 1000),
                   (unsigned int) persec);
 }}}

 I propose we do the same thing for xfrin.

 Further, I wonder it would be nice if we could see the status of
 ongoing xfrin sessions via bindctl.  That would be a nice extension
 unique to BIND 10 (I heard a request from a operator to show this
 information via BIND 9's http stat/status server, so there's a need
 for it).  If it's easy it could be a part of this ticket.  Or it
 may be a subject of a separate ticket.

-- 
Ticket URL: <http://bind10.isc.org/ticket/1280>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development