[SR-Users] Computing a time difference when handling a stateless SIP request

Henning Westerholt hw at skalatan.de
Fri Sep 25 21:11:27 CEST 2020


you could probably combine some string transformation to get the desired result.

If your requirements are related to accounting, the acc module might bei easier to use.



Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://skalatan.de/services
From: sr-users <sr-users-bounces at lists.kamailio.org> on behalf of Chaigneau, Nicolas <nicolas.chaigneau at capgemini.com>
Sent: Friday, September 25, 2020 6:34:30 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Computing a time difference when handling a stateless SIP request

> >
> > --snip
> > I would like to compute a time difference (with microseconds
> > precision) when handling a stateless SIP request.
> > --snip
> Welcome!
> Take a look at:
> https://www.kamailio.org/wiki/cookbooks/5.4.x/pseudovariables#timeval
> You can get down to the microsecond level.


Looking at src\modules\pv\pv_time.c, it seems TV functions just use "gettimeofday".
I was looking for a time difference based on a monotonically increasing clock (to avoid possible NTP drifting imprecision).

I've looked at the "benchmark" module which seems to do something like that, but I don't think I can use it for what I need...

Anyhow, I have another question. Using the TV I've come up with the following.
This works, except that I don't know how to convert an int to a string padded with zeroes (e.g. 51 => "051").
Is there a transformation that allows to do that?

        $var(start_time) = $TV(Sn); # allows to cache $TV(s) and $TV(u)


        $var(end_time) = $TV(Sn);
        $var(end_s) = $TV(sn);
        $var(end_us) = $TV(un);
        $var(diff_us) = $var(end_us) - $TV(u) + (1000000 * ($var(end_s) - $TV(s)));

        # convert this to ms (integer part) and us (fractional part)
        $var(diff_ms) = $var(diff_us) / 1000;
        $var(diff_us_f) = $var(diff_us) - (1000 * $var(diff_ms));

        $var(diff_ms_us) = $var(diff_ms) + "." + $var(diff_us_f); # need to format on 3 digits... can we do the equivalent of sprintf("%03u") somehow ?

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