BIND 10 #1612: b10-auth should catch exceptions in response building

[BIND 10 Development]

#1612: b10-auth should catch exceptions in response building
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  b10-auth      |  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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 Because the underlying data source may not always work correctly,
 especially if it's a non-captive database-based data source (e.g.
 it may not provide NSEC/NSEC3 when DNSSEC is required).  So
 AuthSrv::processMessage should catch exceptions even after parsing the
 request, and if it's an isc-namespace exception it should return
 SERVFAIL.

 We may also want to do the same thing for b10-resolver, btw.

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Ticket URL: <http://bind10.isc.org/ticket/1612>
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BIND 10 Development