[asterisk-dev] [Code Review] Fix incorrect duration reporting in CDRs created in batch mode that use ast_cdr_getvar

[Matt Jordan]

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Review request for Asterisk Developers, Mark Michelson and Tilghman Lesher.


Summary
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Certain places in core/cdr.c would, if the duration value were 0, would calculate the duration as being the delta between the current time and the time at which the CDR record was started.  While this does not typically cause a problem in non-batch mode, this can cause an issue in batch mode where CDR records are gathered and written long after those calls have ended. In particular, this affects calls that were never answered, as those are expected to have a duration of 0.  Often, this would result in CDR logs with a significant number of calls with lengthy durations, but dispositions of "BUSY".

Note that this does not affect CSV CDRs, as that backend does not use ast_cdr_getvar and instead directly reports the duration value.  The affected core backends include cdr_apative_odbc and cdr_custom; other extended or deprecated CDR backends may potentially still directly manipulate the duration values. 

This patch essentially reverts r91617, when this behavior was introduced.


This addresses bug ASTERISK-19860.
    https://issues.asterisk.org/jira/browse/ASTERISK-19860


Diffs
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  /branches/1.8/main/cdr.c 368829 
  /branches/1.8/cdr/cdr_adaptive_odbc.c 368829 

Diff: https://reviewboard.asterisk.org/r/1996/diff


Testing
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Ran through the Asterisk Test Suite's CDR tests.  A new test for batch CDR creation was also written that also tests that the disposition/billsec are 0 when they should be, and non-zero when the calls are answered.


Thanks,

Matt

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