[asterisk-dev] [Code Review] 3057: CDRs: Synchronize dialplan access through Stasis; clean up Answer and DISA

[Matt Jordan]

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https://reviewboard.asterisk.org/r/3057/
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(Updated Dec. 10, 2013, 4:48 p.m.)


Review request for Asterisk Developers.


Changes
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Addressed Josh's finding.


Bugs: ASTERISK-22884 and ASTERISK-22886
    https://issues.asterisk.org/jira/browse/ASTERISK-22884
    https://issues.asterisk.org/jira/browse/ASTERISK-22886


Repository: Asterisk


Description
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When doing the rework of the CDR engine that pushed all of the logic into cdr.c and made it respond to changes in channel state over Stasis, I knew that accessing the CDR engine from the dialplan would be "slightly" non-deterministic. Dialplan threads would be accessing CDRs while Stasis threads would be updating the state of said CDRs - whereas in the past, everything happened on the dialplan threads. Tests have shown that "slightly" is in reality "very".

This patch synchronizes things by making the dialplan applications/functions that manipulate CDRs do so over Stasis. ForkCDR, NoCDR, ResetCDR, CDR, and CDR_PROP now all use Stasis to send their requests over to the CDR engine, and synchronize on the Stasis subscription so that they return their values/control to the dialplan at the appropriate time.

While going through this, the following changes were also made:
 * DISA, which can reset the CDR when a user successfully authenticates, now just uses the ResetCDR app to do this. This prevents having to duplicate the same Stasis synchronization logic in that application.
 * Answer no longer disables CDRs. It actually didn't work anyway - calling DISABLE on the channel's CDR doesn't stop the CDR from getting the Answer time - it just kills all CDRs on that channel, which isn't what the caller would intend.


Diffs (updated)
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  /branches/12/main/pbx.c 403604 
  /branches/12/main/cdr.c 403604 
  /branches/12/include/asterisk/cdr.h 403604 
  /branches/12/funcs/func_cdr.c 403604 
  /branches/12/apps/app_forkcdr.c 403604 
  /branches/12/apps/app_disa.c 403604 
  /branches/12/apps/app_cdr.c 403604 
  /branches/12/UPGRADE.txt 403604 
  /branches/12/CHANGES 403604 

Diff: https://reviewboard.asterisk.org/r/3057/diff/


Testing
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* The CDR tests pass (now deterministicly)
* The hangup handler tests now pass, as they can get reliable values in the h extension from the CDR engine


Thanks,

Matt Jordan

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