[Freeswitch-users] Problem accessing channel variables
Steven Ayre
steveayre at gmail.com
Thu Nov 29 22:43:34 MSK 2012
I would recommend that you adjust your DB check code to run in a loop. CDR
submission occurs *after* CHANNEL_HANGUP - so you have a race condition and
may check the DB before the CDR has been committed. You'd need to handle a)
trying again after a short delay if the CDR isn't there yet and b) a
timeout in case xml_cdr fails and the CDR isn't available (or the script'll
keep running until it is).
On 29 November 2012 19:23, Richard Gration <richgration at gmail.com> wrote:
> Hi Steve,
>
> Thanks for all your help, I have working code now :-)
>
> I don't know if this is a local configuration "feature" but the events
> are returned synchronously from the "event plain CHANNEL_HANGUP" call,
> so I just loop looking for my uuid.
>
> Cheers,
> Rich
>
> PS For anyone interested in some alpha code ...
>
> $dExt = $_GET['dExt'];
> $pin = $_GET['pin'];
>
> if ($dExt and $pin) {
> $fp = event_socket_create($host, $port, $password);
>
> # How shall we abuse the callee today?
> $wav1 = 'ivr/32000/ivr-douche_telecom.wav';
> $wav2 = 'ivr/32000/ivr-thank_you_for_calling.wav';
>
> # Place call and find uuid
> $cmd = "api originate
> {ignore_early_media=true,originate_timeout=30}sofia/external/677${dExt}@MGC
> '&play_and_get_digits(4 9 1 10000 # $wav1 $wav2 foo \d+)'";
> $response = event_socket_request($fp, $cmd);
> $response = strip_cr($response);
> $bits = preg_split('/\s+/',$response);
> $uuid = $bits[1];
>
> $continue = 1;
> $cmd = "event plain CHANNEL_HANGUP";
> while ($continue) {
> error_log("running $cmd");
> $response = event_socket_request($fp, $cmd);
> error_log("got $response");
> if (preg_match("/$uuid/",$response)) {
> $continue = 0;
> }
> }
>
> $dbhRo = DbConnect::GetConnection('db-readonly');
> $res_struct = mysql_query("SELECT strSrcMedia FROM cdr WHERE
> strSipSessionId = '$uuid'",$dbhRo);
> $res = mysql_fetch_array($res_struct);
> $pin_from_user = $res[0];
> $result = $pin == $pin_from_user ? 1 : 0 ;
>
> echo "<pre>";
> echo date('H:i:s') . "\n";
> echo "uuid = $uuid\n";
> echo "$result\n";
> echo "</pre>";
>
> # Close socket
> fclose($fp);
> } else {
> echo -1;
> }
>
>
> On 29 November 2012 13:56, Steven Ayre <steveayre at gmail.com> wrote:
> >> ... how I listen for these events. Is it just a case of polling the
> >> socket for them at frequent enough intervals?
> >
> >
> > You subscribe to the events you're interested in with 'events'
> > http://wiki.freeswitch.org/wiki/Event_socket#event
> >
> > There's no polling involved. FS will send all subscribed events through
> the
> > socket, you just need to receive them. Use select()/poll()/equivalent to
> > detect when data has arrived.
> >
> > Since you already have xml_cdr working that would be the best place to
> > collect it, if you can add an extra DB insert in the handler.
> >
> > -Steve
> >
> >
> > On 29 November 2012 11:58, Richard Gration <richgration at gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> Thanks for your reply. I was wondering ...
> >>
> >> > If you listen to events then you should be able to reliably receive a
> >> > hangup
> >> > event containing the variables if you are still connected at that
> time.
> >>
> >> ... how I listen for these events. Is it just a case of polling the
> >> socket for them at frequent enough intervals?
> >>
> >> > If you want a 100% reliable method use CDRs.
> >> >
> >> > mod_xml_cdr can submit call CDRs to a webserver just after call
> hangup.
> >> > The
> >> > XML is verbose and will contain a full call history and all channel
> >> > variables. Because it's submitted ASAP you get the results in real
> time
> >> > and
> >> > reliable. If the module can't submit the CDRs it writes them to an
> error
> >> > folder on disk where you can resubmit them.
> >> >
> >> > Real time seems useful for your use-case, as your script would just
> need
> >> > to
> >> > check your DB whether the CDR had been submitted yet. The channel UUID
> >> > can
> >> > either be captured from events or specified in advance in the
> originate
> >> > (originate_uuid). There's a uuid api call to generate them for you.
> I'd
> >> > suggest looking at this method.
> >>
> >> This is all great info, thanks :-) I'm capturing the uuid from the
> >> response from the originate command, that's no problem.
> >>
> >> The box I'm doing this on is being a B2BUA for us at the moment. The
> >> CDRs are already being HTTP POSTed to a URL, I can't change that as
> >> our billing depends on it. I can see the channel variable coming
> >> though in the POST content, so maybe I can frob the CDR script to give
> >> me what I want.
> >>
> >> Thanks again for the info.
> >>
> >> Cheers,
> >> Rich
> >>
> >> --
> >> Once our basic material needs are met - in my utopia, anyway - life
> >> becomes a perpetual celebration in which everyone has a talent to
> >> contribute. But we cannot levitate ourselves into that blessed
> >> condition by wishing it. We need to brace ourselves for a struggle
> >> against terrifying obstacles, both of our own making and imposed by
> >> the natural world. And the first step is to recover from the delusion
> >> that is positive thinking.
> >> -- Barbara Ehrenreich
> >>
> >>
> _________________________________________________________________________
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> >> http://www.freeswitchsolutions.com
> >>
> >>
> >>
> >>
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> >
> >
> >
> > _________________________________________________________________________
> > Professional FreeSWITCH Consulting Services:
> > consulting at freeswitch.org
> > http://www.freeswitchsolutions.com
> >
> >
> >
> >
> > Official FreeSWITCH Sites
> > http://www.freeswitch.org
> > http://wiki.freeswitch.org
> > http://www.cluecon.com
> >
> > FreeSWITCH-users mailing list
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> >
>
>
>
> --
> Once our basic material needs are met - in my utopia, anyway - life
> becomes a perpetual celebration in which everyone has a talent to
> contribute. But we cannot levitate ourselves into that blessed
> condition by wishing it. We need to brace ourselves for a struggle
> against terrifying obstacles, both of our own making and imposed by
> the natural world. And the first step is to recover from the delusion
> that is positive thinking.
> -- Barbara Ehrenreich
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
>
>
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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