Hello Duarte,

I wonder if this is down to differences in JS vs. config script in how truthiness is evaluated in `if` statements.

In JavaScript, if(...) evaluates to true if the returned value is a non-zero number (positive or negative). In Kamailio config script[1], in contrast, a value less than 0 is false, while only a positive value > 0 is evaluated as true.

I'm not sure offhand what t_exists() actually returns. According to the documentation, it is a boolean, but it may be that the boolean isn't being propagated properly in the KEMI environment and is being turned into a negative value, which still evaluates as true, in JS.

-- Alex

On Jul 17, 2024, at 1:37 PM, Duarte Rocha via sr-users sr-users@lists.kamailio.org wrote:

Hello all,

I'm using Kamailio with native script and KEMI in Javascript.

I noticed that functions from the TM module can have different results if I call them on KEMI or Native script. Is this intended behaviour? Don't they share the state?

In order to test this i made the following code :

KEMI Code : function ksr_request_route() { try{ if ( KSR.is_method("BYE") ) {

print.error("BYE Request KEMI BYE")

KSR.route("exists_test")

if(KSR.tm.t_exists()) { print.error("KEMI : Transaction exists") } else { print.error("KEMI : Transaction does not exist") }

Native Code : 
   route[exists_test] {

if( t_exists()) { xerr("Native Script : Transaction exists \n"); } else { xerr("Native Script : Transaction does not exist \n"); } }

I've also tried to change function call order but every time I get "Transaction does not exist" on native and "Transaction Exists" on KEMI.

Is this intended behaviour? Should I only call tm functions in native or Kemi in order to have consistency ?

Thanks in advance,

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[1] https://www.kamailio.org/wikidocs/tutorials/faq/main/#how-is-the-function-re...