[asterisk-dev] [Code Review] 3362: func_periodic_hook: New function for periodic hooks.

[Russell Bryant]

> On March 31, 2014, 5:58 p.m., Corey Farrell wrote:
> > /trunk/funcs/func_periodic_hook.c, lines 141-143
> > <https://reviewboard.asterisk.org/r/3362/diff/6/?file=56951#file56951line141>
> >
> >     Macro is deprecated, why not use Gosub?
> 
> Russell Bryant wrote:
>     I tried that.  GoSub() doesn't actually work in this case.  Perhaps because there's no PBX running on the channel?  In any case, that's why.
> 
> rmudgett wrote:
>     I haven't checked, but would calling this be appropriate here to avoid the adding the need for Macro back into the code:
>     int ast_app_exec_sub(struct ast_channel *autoservice_chan, struct ast_channel *sub_chan, const char *sub_args, int ignore_hangup)
>
> 
> Russell Bryant wrote:
>     Awesome. That sounds like the API call needed here.

Well ... it's not *that* straight forward.  GoSub (or Macro) is being used as one side of an originated call.  I'd have to add a new application to make it work.  GoSubInternal (for internal use only) or something.

Any preference between just using Macro vs adding a new GoSubInternal app?

I know Macro is considered deprecated but it does work fine here.  Besides, Macro has been around *so* long (10+ years?), removing it would just be evil.


- Russell


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On March 31, 2014, 8:33 p.m., Russell Bryant wrote:
> 
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> https://reviewboard.asterisk.org/r/3362/
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> 
> (Updated March 31, 2014, 8:33 p.m.)
> 
> 
> Review request for Asterisk Developers.
> 
> 
> Repository: Asterisk
> 
> 
> Description
> -------
> 
>     This commit introduces a new dialplan function, PERIODIC_HOOK().
>     It allows you run to a dialplan hook on a channel periodically.  The
>     original use case that inspired this was the ability to play a beep
>     periodically into a call being recorded.  The implementation is much
>     more generic though and could be used for many other things.
>     
>     The implementation makes heavy use of existing Asterisk components.
>     It uses a combination of Local channels and ChanSpy() to run some
>     custom dialplan and inject any audio it generates into an active call.
>     
>     The other important bit of the implementation is how it figures out
>     when to trigger the beep playback.  This implementation uses the
>     audiohook API, even though it's not actually touching the audio in any
>     way.  It's a convenient way to get a callback and check if it's time
>     to kick off another beep.  It would be nice if this was timer event
>     based instead of polling based, but unfortunately I don't see a way to
>     do it that won't interfere with other things.
> 
> 
> Diffs
> -----
> 
>   /trunk/funcs/func_periodic_hook.c PRE-CREATION 
>   /trunk/CHANGES 411572 
> 
> Diff: https://reviewboard.asterisk.org/r/3362/diff/
> 
> 
> Testing
> -------
> 
> Called the following extension (100 at test), both letting it run all the way through, as well as hanging up at various points in the middle.
> 
> 
> [macro-beep]
> 
> exten => s,1,Answer()
>     same => n,Verbose(1,Channel name: ${ARG1})
>     same => n,Verbose(1,Hook ID: ${ARG2})
>     same => n,Playback(beep)
> 
> [test]
> 
> exten => 100,1,Answer()
>     same => n,Set(BEEP_ID=${PERIODIC_HOOK(beep,5)})
>     same => n,Wait(20)
>     same => n,Set(PERIODIC_HOOK(${BEEP_ID})=off)
>     same => n,Wait(20)
>     same => n,Set(PERIODIC_HOOK(${BEEP_ID})=on)
>     same => n,Wait(20)
>     same => n,Hangup()
> 
> 
> Thanks,
> 
> Russell Bryant
> 
>

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