[OpenSIPS-Users] time going backwards?
Kingsley Tart
kingsley at dns99.co.uk
Mon Jul 12 13:53:00 EST 2021
Gah, thanks - I was having a mega brain fart, clearly. I even already
had this function in my config (!!) ... :-/
BTW, apologies for the lateness of my reply - I've been on holiday.
route[get_timestamp_hires] {
$var(N25_resultAVP) = $param(1);
# returns a floating point number as a string "$seconds.$decimals" representing the timestamp
# accurate to a millisecond. Because $Ts and $Tsm are separate variabls in OpenSIPS, there is
# a tiny chance that $Ts might advance to the next clock second while reading $Tsm, which could
# result in a reported timestamp almost exactly a second wrong.
# Therefore, here we generate a timestamp string where we mitigate against that possibility.
$var(N25_Ts) = $Ts;
$var(N25_Tsm) = $Tsm/1000;
if ($Ts > $var(N25_Ts)) {
# clock has advanced, take new values
$var(N25_Ts) = $Ts;
$var(N25_Tsm) = $Tsm/1000;
}
if ($var(N25_Tsm) < 10) {
$var(N25_Tsm) = "00" + $var(N25_Tsm);
} else if ($var(N25_Tsm) < 100) {
$var(N25_Tsm) = "0" + $var(N25_Tsm);
}
$avp($var(N25_resultAVP)) = "" + $var(N25_Ts) + "." + $var(N25_Tsm);
}
Cheers,
Kingsley.
On Sat, 2021-06-26 at 19:37 +0200, Gregory Massel wrote:
> Per https://www.opensips.org/Documentation/Script-CoreVar-3-1
> $Tsm - reference to current microseconds of the current second
> This means that if the second counter cycles up, the microsecond counter will cycle back to zero and you'll get a negative.
> e.g. Let's assume that at the time of the first reading of $Tsm it is 12:00:00.99999 and, at the time of the second reading, it's 12:00:01.00003, then you'll get a result of -0.99996, because you're looking at the fraction of a second in isolation to the second counter.
> So you probably need something like:
> $var(t0s) = $Ts;
> $var(t0ms) = $Tsm;
> $var(node_number) = route(get_my_node_number);
> $var(dur) = (($Ts - $var(t0s))*1000000) + $Tsm - $var(t0ms);
>
> Note: I'm not sure whether the syntax above is correct (I've never tried to do arithmetic operations within OpenSIPS), but the basic idea is there.
> --Greg
> On 2021-06-25 22:01, Kingsley Tart wrote:
> > Hi,
> >
> > For testing, this code at the top of my route script:
> >
> > $var(t0) = $Tsm;
> > $var(node_number) = route(get_my_node_number);
> > $var(dur) = $Tsm - $var(t0);
> > xlog("My node number is $var(node_number) and it took $var(dur) microsecconds to find out\n");
> >
> > has just logged this:
> >
> > Jun 25 20:55:01 [598]: My node number is -1 and it took 65 microsecconds to find out
> > Jun 25 20:55:03 [598]: My node number is -1 and it took 67 microsecconds to find out
> > Jun 25 20:55:05 [598]: My node number is -1 and it took 64 microsecconds to find out
> > Jun 25 20:55:05 [578]: My node number is -1 and it took 602523 microsecconds to find out
> > Jun 25 20:55:06 [579]: My node number is -1 and it took -79396 microsecconds to find out
> > Jun 25 20:55:07 [598]: My node number is -1 and it took 63 microsecconds to find out
> > Jun 25 20:55:07 [580]: My node number is -1 and it took -455503 microsecconds to find out
> > Jun 25 20:55:07 [579]: My node number is -1 and it took 108 microsecconds to find out
> > Jun 25 20:55:09 [598]: My node number is -1 and it took 78 microsecconds to find out
> > Jun 25 20:55:11 [598]: My node number is -1 and it took 68 microsecconds to find out
> > Jun 25 20:55:13 [598]: My node number is -1 and it took 66 microsecconds to find out
> > Jun 25 20:55:15 [598]: My node number is -1 and it took 68 microsecconds to find out
> > Jun 25 20:55:17 [598]: My node number is -1 and it took 65 microsecconds to find out
> > Jun 25 20:55:18 [578]: My node number is -1 and it took 107 microsecconds to find out
> > Jun 25 20:55:19 [598]: My node number is -1 and it took 71 microsecconds to find out
> >
> > which is weird because time seems to have gone backwards a couple of times.
> >
> > Using OpenSIPS 3.1.2 in a VM running Debian 10, with the host being a
> > CentOS 7 machine running Qemu KVM.
> >
> > Any idea what's happening here?
> >
> > Cheers,
> > Kingsley.
> >
> >
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>
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