[SR-Users] python_exec return 0 causes script hangs; return -1 is treated like 0

[Daniel-Constantin Mierla]

Hello,

kamailio's native scripting language interpreter has a custom handling
for return values:

  - return < 0 - it is evaluated as false

  - return >0 - it is evaluated as true

  - return = 0 - it is evaluated as 'stop execution of config script'

See also:

  -
https://www.kamailio.org/wiki/tutorials/faq/main#how_is_the_function_return_cod

It is how the interpreter was designed long time ago (like 2001 - 2002).

Cheers,
Daniel


On 15.02.18 10:28, Anthony Alba wrote:
> 5.1.1: if python_exec method returns 0, then the script hangs
>
> If the python_exec method return -1, then expressions treat it as if
> it returned zero.
>
> Somewhere there seems to be an offset by 1 issue.
>
>  if (!python_exec("method")) {
>    # if you return -1, the script does not hang but treated like zero
> }
>
> ##################
> Example 1:
> class kamailio(object):
>     def hello(self, msg):
>         KSR.info("hello, world\n")
>         return 0
>
> Calling:  python_exec("hello")
>
> will cause script hang
>
> ###################
> Example 2:
> class kamailio(object):
>     def hello(self, msg):
>         KSR.info("hello, world\n")
>         return -1
>
> Calling  python_exec("hello")
>
>                 if (!python_exec("hello")) {
>                         ## method returns -1
>                         ## why did we get here?
>                         xlog("L_INFO","method return zero!\n");
>                 }
>
>
> shows INFO: <script>: method return zero!
>
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-- 
Daniel-Constantin Mierla
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