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List:       sr-users
Subject:    [SR-Users] What is the expected behavior for dispatcher's ds_next_dst?
From:       "geoff.goas--- via sr-users" <sr-users () lists ! kamailio ! org>
Date:       2023-09-26 20:02:33
Message-ID: 169575855372.1539.140011664376079114 () main ! kamailio ! org
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Hello,

I have some questions about dispatcher's behavior. I noticed that when I first \
ds_select_dst() a specific dispatcher group ID, ds_next_dst() will cycle through the \
active destinations in that group. When it reaches the end of the destinations in the \
group, it does not return "false", instead it starts to return destinations that are \
not a part of that group, ie. those destinations which are listed prior to the \
selected group in the dispatcher.list file. Is this the expected behavior? I've \
observed it on kamailio 5.3 and 5.5 releases.

My dispatcher.list:

# Group 1
1 sip:127.0.0.1:5071;transport=udp 8 0
# Group 2
2 sip:127.0.0.1:5072;transport=udp 8 0
# Group 3
3 sip:127.0.0.1:7010;transport=udp 8 0
3 sip:127.0.0.1:7011;transport=udp 8 0
3 sip:127.0.0.1:7012;transport=udp 8 0
# Group 4 
4 sip:127.0.0.1:5071;transport=udp 8 0
4 sip:127.0.0.1:5072;transport=udp 8 0

I have the following in failure_route (excerpt):

                    $var(dsFoundDestination) = 0;

                        if (t_any_replied())
                        {
                            xavp_params_implode("_dsdst_", "$var(dsDestinations)");
                            xlog("L_INFO", "FAILURE ROUTE: Already have replies on \
this transaction. Selecting next destination from: [$var(dsDestinations)]");  if \
(ds_next_dst())  {
                                xavp_params_implode("_dsdst_", \
                "$var(dsDestinations)");
                                xlog("L_INFO", "FAILURE ROUTE: Next destination \
selected: [$du] from [$var(dsDestinations)]");  $var(dsFoundDestination) = 1;
                            }
                        }
                        else if (ds_select_dst("3", "8")) // Dispatcher Group 3
                        {
                            xlog("L_INFO", "FAILURE ROUTE: Did not find any replies \
on this transaction. Selected destination: [$du]");  $var(dsFoundDestination) = 1;
                        }
                        if ($var(dsFoundDestination))
                        {
                            $var(logString) = "FAILURE ROUTE: Relayed to [" + $du + \
"]";  if (t_relay())
                            {
                                xlog("L_INFO", "$var(logString)");
                            }
                        }

Produces the following logs:

FAILURE ROUTE: Did not find any replies on this transaction. Selected destination: \
[sip:127.0.0.1:7012;transport=udp] FAILURE ROUTE: Relayed to \
[sip:127.0.0.1:7012;transport=udp] FAILURE ROUTE: Already have replies on this \
transaction. Selecting next destination from: \
[grp=3;uri=sip:127.0.0.1:7012;transport=udp;] FAILURE ROUTE: Next destination \
selected: [sip:127.0.0.1:7011;transport=udp] from \
[grp=3;uri=sip:127.0.0.1:7011;transport=udp;] FAILURE ROUTE: Relayed to \
[sip:127.0.0.1:7011;transport=udp] FAILURE ROUTE: Already have replies on this \
transaction. Selecting next destination from: \
[grp=3;uri=sip:127.0.0.1:7011;transport=udp;] FAILURE ROUTE: Next destination \
selected: [sip:127.0.0.1:7010;transport=udp] from \
[grp=3;uri=sip:127.0.0.1:7010;transport=udp;] FAILURE ROUTE: Relayed to \
[sip:127.0.0.1:7010;transport=udp] FAILURE ROUTE: Already have replies on this \
transaction. Selecting next destination from: \
[grp=3;uri=sip:127.0.0.1:7010;transport=udp;] FAILURE ROUTE: Next destination \
selected: [sip:127.0.0.1:5072;transport=udp] from \
[grp=2;uri=sip:127.0.0.1:5072;transport=udp;] FAILURE ROUTE: Relayed to \
[sip:127.0.0.1:5072;transport=udp] FAILURE ROUTE: Already have replies on this \
transaction. Selecting next destination from: \
[grp=2;uri=sip:127.0.0.1:5072;transport=udp;] FAILURE ROUTE: Next destination \
selected: [sip:127.0.0.1:5072;transport=udp] from \
[grp=2;uri=sip:127.0.0.1:5072;transport=udp;] FAILURE ROUTE: Relayed to \
[sip:127.0.0.1:5072;transport=udp] FAILURE ROUTE: Already have replies on this \
transaction. Selecting next destination from: \
[grp=2;uri=sip:127.0.0.1:5072;transport=udp;] FAILURE ROUTE: Next destination \
selected: [sip:127.0.0.1:5071;transport=udp] from \
[grp=1;uri=sip:127.0.0.1:5071;transport=udp;] FAILURE ROUTE: Relayed to \
[sip:127.0.0.1:5071;transport=udp]

I want to stop the loop once there are no more active destinations in group 3. Is the \
solution simply to check that the selected destination is part of the desired group \
and stop processing if it is not?

Thanks for your time.
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