Hello,
On 3/24/12 1:25 PM, Alex Balashov wrote:
I am not sure that exporting #defines to third-party language API modules makes
much sense just because some user thought it would be neat.
The #!... constructs are all intended as preprocessor directives, to make
easier management of global constant values in the native Kamailio config
environment and to allow easier management of conditionally-enabled chunks of
code therein, right?
Conceptually, it does not seem to me that they should have any representation
outside of that evaluative context. It would be like making preprocessor macro
values in C available through the libdl/ELF dynamic shared object interface.
It doesn't make any sense. If you really want to export preprocessor
macro-dependent values, trouble yourself to use an intermediate variable--a
real variable.
In Kamailio, this would take the form:
#!ifdef MYPROJECT
#!define MYPROJECT_IP 1.2.3.4
# Exportable symbol:
myproject.ip = "MYPROJECT_IP" descr "..."
#!endif
Doesn't that make much more sense, in terms of what these directives were
really intended for?
yes, the directives were added as switches for part of the config
initially, next version added also values for defines. I thought of
being able to detect in Lua and do switches there as well based on what
was defined in kamailio config.
Your solution is good, exporting them to lua will just save some memory
and make config smaller. So it is indeed more an optimization, not at
all an implementation of a missing (impossible) feature.
Cheers,
Daniel
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Evariste Systems LLC
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Daniel-Constantin Mierla<mico...@gmail.com> wrote:
Hello,
On 3/23/12 2:00 PM, Asgaroth wrote:
I'll check this option out, thanks for the tip Alex.
it is a good way to do, $sel(...) are available in Lua, @... format not,
but they are the same, just different access mechanism.
I guess the other option too, which I have not tried, is to possibly
pass in the values as lua script parameters.
Yes, you can do that. You may need to use 'subst' instead of 'define' in
order to be able to replace the token inside another string.
Exporting defines to Lua could be a good enhancement anyhow, I will
think about and maybe add it in the near future.
Cheers,
Daniel
On 23/03/12 12:12, Alex Balashov wrote:
Have you considered using selectors/cfg_get variables instead?
They are also a common way to store various types of "global"
values/constants, with the difference that they can be accessed at
run time using PV container functions instead of set at preprocessing.
myproject.local_ip = "1.2.3.4" descr "IP address"
$sel(cfg_get.my project.local_ip)
Or SER-style: @cfg_get.my project.local_ip
You can evaluate those in Lua, right?
--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Atlanta, GA 30030
Tel: +1-678-954-0671
Web: http://www.evaristesys.com/, http://www.alexbalashov.com
Asgaroth<00asgarot...@gmail.com> wrote:
Hi All,
I am looking at writing a lua function that would really benefit from
accessing "variables" that I would have defined by using the #!define
statement. Is this at all possible? I've tried looking at the
documentation surrounding lua and kamailio, but I cannot see how I
would
access it. I thought I'd ask the list to see if anyone else may have
attempted this.
for example, I may have
#!define INTERNAL_ADDRESS 1.2.3.4
Which I subsequently use through the the routing script to refer to the
internal address I am listening on. Now I would like to try and access
this "variable" from a lua script. Any pointers/tips/workarounds would
be greatly appreciated.
Thanks
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Kamailio Advanced Training, April 23-26, 2012, Berlin, Germany
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Kamailio Advanced Training, April 23-26, 2012, Berlin, Germany
http://www.asipto.com/index.php/kamailio-advanced-training/
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