Hello Michael,

There are internal API functions which handle pseudovariable interpolation in string arguments, e.g. pv_get_spec_value().

You can see one-off uses of this for example in the fixup functions (functions which preliminarily process and validate arguments, often, but not always beginning with w_, for "wrapper").

You can see how this works in the 'uac' module, for example:

https://github.com/kamailio/kamailio/blob/master/src/modules/uac/auth.c#L266

But in my opinion, the most sensible packaging of this functionality is done in the dispatcher module. You'll note that ds_select_*() share a wrapper called w_ds_select_addr():

https://github.com/kamailio/kamailio/blob/master/src/modules/dispatcher/disp...

There is this nice macro, proprietary to the dispatcher module, called GET_VALUE():

https://github.com/kamailio/kamailio/blob/master/src/modules/dispatcher/disp...

That's defined here:

https://github.com/kamailio/kamailio/blob/master/src/modules/dispatcher/disp...

And it takes advantage of a core API function called get_is_fparam():

https://github.com/kamailio/kamailio/blob/master/src/core/sr_module.c#L1656

As you can see, it can evaluate all kinds of interpolated values.

So, I'd just use that.

-- Alex

On Fri, Dec 13, 2019 at 12:10:02PM -0600, Michael Iedema wrote:

Hi all,

I’m trying to write a basic Kamailio module from scratch and have run into an area where I’m in need of a couple pointers (pun not intended). :-) I have the module loading correctly and can call a function in my routing script like this:

mymod_getinfo(“5551234”);

This, for now, just triggers a print of the submitted parameter.

What I’d like to do next is have it accept and print the From URI in configuration script like so:

mymod_getinfo(“$fU”);

For now, this prints the string literal of “$fU” and I’m trying to extract the value of the referenced variable and print that. The example module “print” does not involve this concept of pseudo-variables. The skeleton module example in the wiki also does not mention variables.

I’ve looked into other modules to see how it works but they all seem to have a slightly different handling of this task. Can someone point me to an example in the modules which accomplishes this?

What I’ve been searching for is a replace_all function which accepts a string containing pseudo-variables and returns a new string with them all replaced with their corresponding values.

Thanks in advance and apologies if I’ve overlooked a relevant piece of developer documentation or if I’m looking at this incorrectly.

Regards, -Michael

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(adding sr-dev list to CC)

Hi Michael,

small general addition - you are probably already aware of this documentation:

https://www.asipto.com/pub/kamailio-devel-guide/

There is work going on right now to update it, it needs also some extensions, e.g. for the PV core functions.

Cheers,

Henning

Am 13.12.19 um 19:10 schrieb Michael Iedema:

Hi all,

I’m trying to write a basic Kamailio module from scratch and have run into an area where I’m in need of a couple pointers (pun not intended). :-) I have the module loading correctly and can call a function in my routing script like this:

mymod_getinfo(“5551234”);

This, for now, just triggers a print of the submitted parameter.

What I’d like to do next is have it accept and print the From URI in configuration script like so:

mymod_getinfo(“$fU”);

For now, this prints the string literal of “$fU” and I’m trying to extract the value of the referenced variable and print that. The example module “print” does not involve this concept of pseudo-variables. The skeleton module example in the wiki also does not mention variables.

I’ve looked into other modules to see how it works but they all seem to have a slightly different handling of this task. Can someone point me to an example in the modules which accomplishes this?

What I’ve been searching for is a replace_all function which accepts a string containing pseudo-variables and returns a new string with them all replaced with their corresponding values.

Thanks in advance and apologies if I’ve overlooked a relevant piece of developer documentation or if I’m looking at this incorrectly.

Regards, -Michael

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