[SR-Users] AVPOPS: is_avp_set/avp_check "name" parameter as variable.

[Daniel-Constantin Mierla]

Hello,

avp module comes from ser branch, probably it is the reason it was
mentioned to be deprecated. However, avpops was developed with only one
avp list in mind (caller list).

Anyhow, avps do not evaluate the names as a string, but a single
variable, maybe you can try like:

$avp(x) = $_s(dm_ds_setid_$rm);

then: is_avp_set("$avp($avp(x))")

or: if($avp($avp(x))!=$null)

If it is not in pair with avpops, then avp module won't be removed.

Cheers,
Daniel

On 10.11.17 17:00, Asgaroth wrote:
> Hi All,
>
> I was having a read of the AVP module documentation and I see
> mentioned that in future releases of kamailio that the AVP module may
> become deprecated in favour of using AVPOPS module. To this end, I
> started looking to switch some of AVP functions over to AVPOPS
> functions when I cam across an issue where I cannot have the name
> parameter of the avp to check a variable.
>
> I have some attributes defined for a domain which I load up using
> lookup_domain, one of these attributes is a dispatcher setid based on
> the request method being processed. So, with AVP I can do something
> like the following to see if it is set:
>
> if ( attr_exists( $_s(dm_ds_setid_$rm) ) )
>
> The above works as expected, but if I try using something equivelent
> using avpops functions, something like:
>
> if ( is_avp_set("$avp(s:$_s(dm_ds_setid_$rm))") )
> or
> if ( is_avp_set("$avp(s:dm_ds_setid_$rm)") )
> or
> if ( is_avp_set("$avp($_s(dm_ds_setid_$rm))") )
> or
> if ( is_avp_set("$avp(dm_ds_setid_$rm)") )
>
> Then it fails the check even though the avp is set correctly, there
> are no errors in the logs so it all appears to be okay.
>
> Likewise, when checking with the following AVP function, it works:
>
> if ( attr_equals("$_s(dm_ds_setid_$rm)", "100") )
>
> But, if I try with AVPOPS function, it fails (I'm guessing its bacause
> the avp cannot be found)
>
> if ( avp_check("$avp(s:$_s(dm_ds_setid_$rm))", "100") )
> or
> if ( avp_check("$avp(s:dm_ds_setid_$rm)", "100") )
> or
> if ( avp_check("$avp($_s(dm_ds_setid_$rm))", "100") )
> or
> if ( avp_check("$avp(dm_ds_setid_$rm", "100") )
>
> Are the AVPOPS functions able to take nested variables like the above?
> Is this a bug or am I using them incorrectly?
>
> I'm currently trying this out on kamailio v5.0.4.
>
> Any thoughts on the issue would be appreciated.
>
> Thanks
>
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-- 
Daniel-Constantin Mierla
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