BIND 10 #2940: DHCPv4 server crashes when using Memfile backend and running perfdhcp

[BIND 10 Development]

#2940: DHCPv4 server crashes when using Memfile backend and running perfdhcp
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            Reporter:  marcin        |                        Owner:
                Type:  defect        |  marcin
            Priority:  medium        |                       Status:
           Component:  dhcp4         |  reviewing
            Keywords:                |                    Milestone:  DHCP
           Sensitive:  0             |  Outstanding Tasks
         Sub-Project:  DHCP          |                   Resolution:
Estimated Difficulty:  0             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:
                                     |  Medium
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by dclink):

 * owner:  dclink => marcin
 * status:  assigned => reviewing


Comment:

 It happens when the client id is null. Marcin and I decided to create a
 new small method for Lease4 which returns an empty vector if client_id_ is
 null. Besides, the custom KeyExtractor for lease4 storage was simply
 replaced by a const function access to this new method.
 For last, a new small set of unit tests comes with (Plus a small update of
 ClientIdNull one to check if it throws an exception...).

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Ticket URL: <http://bind10.isc.org/ticket/2940#comment:2>
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