[sr-dev] trouble with testing $var

[Andrei Pelinescu-Onciul]

On Nov 08, 2009 at 12:55, Juha Heinanen <jh at tutpro.com> wrote:
> i wrote alias_contact() function and seems to work fine.  i have not
> yet written handle_alias(), but tried to first use scripting means for
> that.  that led into trouble with testing is $var has value.
> 
> i have this piece of code:
> 
>    xlog("L_INFO", "R-URI is <$ru>\n");
>    $var(tmp) = $(ru{uri.param,alias});
>    xlog("L_INFO", "Alias param is <$var(tmp)>\n");
>    if ($var(tmp)) {
> 	    xlog("L_INFO", "Alias param is <$var(tmp)>\n");
> 	    $du = $var(tmp);
        ^^^^^^^^
        shouldn't it be $du = "sip:" + $var(tmp) ?

> 	    xlog("L_INFO", "Routing in-dialog $rm from <$fu> to <$du>\n");
>     } else {
> 	    xlog("L_INFO", "Routing in-dialog $rm from <$fu> to <$ru>\n");
>     }
> 
> and i get to syslog:
> 
> Nov  8 12:51:10 localhost /usr/sbin/sip-proxy[4506]: INFO: R-URI is <sip:jh_test_fi at 192.98.101.10:5074;transport=tcp;alias="192.98.101.10:55375;transport=tcp">
> Nov  8 12:51:10 localhost /usr/sbin/sip-proxy[4506]: INFO: Alias param is <192.98.101.10:55375;transport=tcp>
> Nov  8 12:51:10 localhost /usr/sbin/sip-proxy[4506]: INFO: Routing in-dialog BYE from <sip:test at as.test.fi> to <sip:jh_test_fi at 192.98.101.10:5074;transport=tcp;alias="192.98.101.10:55375;transport=tcp">
> 
> why does the test
> 
>    if ($var(tmp)) {
> 
> fail to figure out that $var(tmp) has value?

You should use if ($var(tmp)!="").
if ($var(tmp)) works only for integers. If $var(tmp) is not integer and
not a string of the form "1234", it will evaluate to 0 in an integer
context. The if() it's an integer context (no boolean context in sr).


Andrei