[asterisk-dev] [Code Review] 3698: Remove deprecated modules and options (Round #1)
Tilghman Lesher
reviewboard at asterisk.org
Thu Jul 3 09:07:10 CDT 2014
> On July 2, 2014, 3:14 p.m., Tilghman Lesher wrote:
> > /trunk/UPGRADE.txt, line 51
> > <https://reviewboard.asterisk.org/r/3698/diff/1/?file=61807#file61807line51>
> >
> > I would think that they could continue to use the MSet application if they wanted some of the old semantics; however, Set will now only work with the new (since 1.6.0) semantics.
>
> Matt Jordan wrote:
> Why should we continue to support the old semantics?
The real reason is due to AEL. See the other response.
> On July 2, 2014, 3:14 p.m., Tilghman Lesher wrote:
> > /trunk/res/ael/pval.c, line 3390
> > <https://reviewboard.asterisk.org/r/3698/diff/1/?file=61842#file61842line3390>
> >
> > There are implications to how the language compilation works that are satisfied by using MSet. Unless you're going to revisit how AEL works, I'd suggest keeping this as always running MSet in the future.
>
> Matt Jordan wrote:
> Can you explain this a bit more? I'm not sure how MSet is required here. In each of the cases here, it appears as if a single variable is being set, which - from a cursory look - should be able to be satisfied using Set instead of MSet. I could easily be missing something here however.
Consider this line from configs/extensions.conf.sample:
CONSOLE-AEL="Console/dsp";
This get translated to:
MSet(CONSOLE-AEL=$["Console/dsp"])
The expression parser will evaluate a string as itself, and MSet will remove the quotes. If the quotes are not removed, consider what would happen when you tried to Dial that variable:
Dial("Console/dsp")
The Dial app will parse that and attempt to find a technology called '"Console', which will fail.
Now, let's suppose that you modified the AEL app to remove the quotes. Sounds plausible, right? Except that you now need to consider what happens if the first character in a string is a digit:
MSet(foo=$[1234-office])
This would get a parse error, and the evaluation would come back to the empty string, almost certainly not what the person writing AEL intended. So fine, let's remove the expression parser, too:
time_left = ${somevar} - ${someothervar}
Now, this (other) expression will fail, whereas with the expression parser, it would perform as needed. Even worse, consider that you just won't know at compile time (without a LOT of work) whether a particular argument (due to variable interpolation) might be interpreted as an arithmetic expression or simply as a string. Bottom line, unless you're going to go through the AEL code and figure out another way of parsing AEL expressions, all of which have to happen at compile time, with loosely typed variables, you're best to leave in MSet.
- Tilghman
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On July 2, 2014, 12:54 a.m., Matt Jordan wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviewboard.asterisk.org/r/3698/
> -----------------------------------------------------------
>
> (Updated July 2, 2014, 12:54 a.m.)
>
>
> Review request for Asterisk Developers.
>
>
> Repository: Asterisk
>
>
> Description
> -------
>
> Per the discussion on the asterisk-dev mailing list [1], this patch removes the following:
>
> * cdr_sqlite
> * chan_gtalk
> * chan_jingle
> * chan_h323
> * res_jabber
> * app_saycountpl
> * app_readfile
> * app_dahdibarge
>
> It removes the following applications/functions:
>
> * WaitMusicOnHold
> * SetMusicOnHold
> * SIPCHANINFO
>
> And it removes the colon delimiter from the SIPPEER function.
>
> It also removes all compatibility options that were configurable from asterisk.conf, as these all applied to compatibility with Asterisk 1.4 systems.
>
> Corey pointed out a number of other deprecated applications/functions, and those should get removed as well - but I wanted to get round #1 up and going since the channel drivers in particular are a bit odious with the media rework going on.
>
> [1] http://lists.digium.com/pipermail/asterisk-dev/2014-June/068363.html
>
>
> Diffs
> -----
>
> /trunk/utils/conf2ael.c 417729
> /trunk/utils/ael_main.c 417729
> /trunk/res/res_musiconhold.c 417729
> /trunk/res/res_jabber.c 417729
> /trunk/res/res_agi.c 417729
> /trunk/res/ael/pval.c 417729
> /trunk/pbx/pbx_realtime.c 417729
> /trunk/main/pbx.c 417729
> /trunk/main/asterisk.c 417729
> /trunk/include/asterisk/options.h 417729
> /trunk/configs/jingle.conf.sample 417729
> /trunk/configs/jabber.conf.sample 417729
> /trunk/configs/gtalk.conf.sample 417729
> /trunk/configs/asterisk.conf.sample 417729
> /trunk/channels/h323/noexport.map 417729
> /trunk/channels/h323/compat_h323.cxx 417729
> /trunk/channels/h323/compat_h323.h 417729
> /trunk/channels/h323/cisco-h225.cxx 417729
> /trunk/channels/h323/cisco-h225.h 417729
> /trunk/channels/h323/cisco-h225.asn 417729
> /trunk/channels/h323/chan_h323.h 417729
> /trunk/channels/h323/caps_h323.cxx 417729
> /trunk/channels/h323/caps_h323.h 417729
> /trunk/channels/h323/ast_ptlib.h 417729
> /trunk/channels/h323/ast_h323.cxx 417729
> /trunk/channels/h323/ast_h323.h 417729
> /trunk/channels/h323/TODO 417729
> /trunk/channels/h323/README 417729
> /trunk/channels/h323/Makefile.in 417729
> /trunk/channels/h323/INSTALL.openh323 417729
> /trunk/channels/h323/ChangeLog 417729
> /trunk/channels/chan_sip.c 417729
> /trunk/channels/chan_jingle.c 417729
> /trunk/channels/chan_h323.c 417729
> /trunk/channels/chan_gtalk.c 417729
> /trunk/channels/Makefile 417729
> /trunk/apps/app_readfile.c 417729
> /trunk/apps/app_dahdibarge.c 417729
> /trunk/addons/app_saycountpl.c 417729
> /trunk/addons/Makefile 417729
> /trunk/UPGRADE.txt 417729
> /trunk/CHANGES 417729
>
> Diff: https://reviewboard.asterisk.org/r/3698/diff/
>
>
> Testing
> -------
>
> Asterisk compiles without the various modules and loads correctly.
>
>
> Thanks,
>
> Matt Jordan
>
>
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