[OpenSIPS-Users] Load balancer ORed resource types

[Taner Sener]

Hi Bogdan,

In my tests when all resources from group id 1 (with higher priority) are
busy (or fail to accept call with some error) I'm calling load_balance for
group id 2. Although there is available destinations on this group, return
code from load_balance call is < 0. So this is the point where I'm stuck.

Any help appreciated.

Here's my configuration.

load_balancer table
-------------------------------
+----+----------+---------------------+-----------+------------+-------------+
| id | group_id | dst_uri             | resources | probe_mode | description
|
+----+----------+---------------------+-----------+------------+-------------+
| 95 |     8002 | sip:ar at 10.10.5.23 <sip%3Aar at 10.10.5.23>   | sip=1     |
       2 |             |
| 19 |     8002 | sip:ar at 10.10.5.44 <sip%3Aar at 10.10.5.44>   | sip=1     |
       2 |             |
| 20 |     8003 | sip:ar at 10.210.54.86 <sip%3Aar at 10.210.54.86> | sip=1     |
         2 |             |
| 96 |     8002 | sip:ar at 10.10.5.13 <sip%3Aar at 10.10.5.13>   | sip=1     |
       2 |             |
| 97 |     8002 | sip:ar at 10.10.5.10 <sip%3Aar at 10.10.5.10>   | sip=1     |
       2 |             |
| 98 |     8002 | sip:ar at 10.10.6.50 <sip%3Aar at 10.10.6.50>   | sip=1     |
       2 |             |
...

opensips.cfg
----------------------
####### Global Parameters #########

debug=3
log_stderror=no
log_facility=LOG_LOCAL6

fork=yes
children=4

/* uncomment the next line to disable TCP (default on) */
disable_tcp=yes

port=5060

####### Modules Section ########

#set module path
mpath="//lib/opensips/modules/"

/* uncomment next line for MySQL DB support */
loadmodule "db_mysql.so"
loadmodule "signaling.so"
loadmodule "sl.so"
loadmodule "tm.so"
loadmodule "rr.so"
loadmodule "maxfwd.so"
loadmodule "usrloc.so"
loadmodule "registrar.so"
loadmodule "textops.so"
loadmodule "mi_fifo.so"
loadmodule "uri.so"
loadmodule "xlog.so"
loadmodule "acc.so"

/* uncomment next lines for MySQL based authentication support
   NOTE: a DB (like db_mysql) module must be also loaded */
loadmodule "auth.so"
loadmodule "auth_db.so"

# needed for load balancer module
loadmodule "dialog.so"
loadmodule "load_balancer.so"

# ----------------- setting module-specific parameters ---------------


# ----- mi_fifo params -----
modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo")


# ----- rr params -----
modparam("rr", "enable_double_rr", 1)
modparam("rr", "append_fromtag", 1)


# ----- usrloc params -----
modparam("usrloc", "db_mode",   0)


# ----- uri params -----
modparam("uri", "use_uri_table", 0)


# ----- acc params -----
/* what sepcial events should be accounted ? */
modparam("acc", "early_media", 1)
modparam("acc", "report_ack", 0)
modparam("acc", "report_cancels", 0)

/* by default ww do not adjust the direct of the sequential requests.
   if you enable this parameter, be sure the enable "append_fromtag"
   in "rr" module */
modparam("acc", "detect_direction", 0)

/* account triggers (flags) */
modparam("acc", "failed_transaction_flag", 3)

/* uncomment the following lines to enable DB accounting also */
modparam("acc", "db_flag", 1)
modparam("acc", "db_missed_flag", 2)


# ----- auth_db params -----
/* uncomment the following lines if you want to enable the DB based
   authentication */
modparam("auth_db", "calculate_ha1", yes)
modparam("auth_db", "password_column", "password")


# ----- tm params -----
modparam("tm", "fr_timer", 5)
modparam("tm", "fr_inv_timer", 5)


# ----- load balancer params -----
modparam("load_balancer", "db_url", "mysql://opensips:opensipsrw@localhost
/opensips16")
modparam("load_balancer", "db_table", "load_balancer")
modparam("load_balancer", "probing_interval", 20)
modparam("load_balancer", "probing_method", "OPTIONS")
modparam("load_balancer", "probing_from",
"sip:proxy at 192.168.187.121<sip%3Aproxy at 192.168.187.121>
")

####### Routing Logic ########


# main request routing logic
route{
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483","Too Many Hops");
exit;
}

if (has_totag()) {
# sequential request withing a dialog should
# take the path determined by record-routing
if (loose_route()) {
if (is_method("BYE")) {
setflag(1); # do accounting ...
setflag(3); # ... even if the transaction fails
} else if (is_method("INVITE")) {
# even if in most of the cases is useless, do RR for
# re-INVITEs alos, as some buggy clients do change route set
# during the dialog.
record_route();
}
# route it out to whatever destination was set by loose_route()
# in $du (destination URI).
route(1);
} else {
if ( is_method("ACK") ) {
if ( t_check_trans() ) {
# non loose-route, but stateful ACK; must be an ACK after
# a 487 or e.g. 404 from upstream server
t_relay();
exit;
} else {
# ACK without matching transaction ->
# ignore and discard
exit;
}
}
sl_send_reply("404","Not here");
}
exit;
}

#initial requests

# CANCEL processing
if (is_method("CANCEL"))
{
if (t_check_trans())
t_relay();
exit;
}

t_check_trans();

# preloaded route checking
if (loose_route()) {
xlog("L_ERR",
"Attempt to route with preloaded Route's [$fu/$tu/$ru/$ci]");
if (!is_method("ACK"))
sl_send_reply("403","Preload Route denied");
exit;
}

# record routing
if (!is_method("REGISTER|MESSAGE"))
record_route();

# account only INVITEs
if (is_method("INVITE")) {
setflag(1); # do accounting
}
 if (is_method("PUBLISH"))
{
sl_send_reply("503", "Service Unavailable");
exit;
}
 if ($rU==NULL) {
# request with no Username in RURI
sl_send_reply("484","Address Incomplete");
exit;
}

# when routing via usrloc, log the missed calls also
setflag(2);

route(3);
}

route[1] {
# for INVITEs enable some additional helper routes
if (is_method("INVITE")) {
t_on_branch("2");
t_on_reply("2");
t_on_failure("1");
}

if (!t_relay()) {
sl_reply_error();
};
exit;
}


route[3] {
        if (is_method("INVITE")) {
            load_balance("8002", "sip");
            if ($retcode < 0) {
             xlog("L_INFO", "load_balancer: Insufficient resource to balance
request from $fu to $tu . Re-balancing to route 4!\n");
route(4);
            }
        }
 t_on_failure("2");

# send request
if (!t_relay()) {
sl_reply_error();
}
exit;
}

route[4] {
        if (is_method("INVITE")) {
            load_balance("8003", "sip");
            if ($retcode < 0) {
             xlog("L_INFO", "load_balancer: Insufficient resource to balance
request from $fu to $tu . Sending error!\n");
                sl_send_reply("500", "Service full");
                exit;
            }
        }
 # send request
if (!t_relay()) {
sl_reply_error();
}
exit;
}


branch_route[2] {
xlog("new branch at $ru\n");
}


onreply_route[2] {
xlog("incoming reply\n");
}

de

failure_route[1] {
if (t_was_cancelled()) {
exit;
}

# uncomment the following lines if you want to block client
# redirect based on 3xx replies.
##if (t_check_status("3[0-9][0-9]")) {
##t_reply("404","Not found");
## exit;
##}

# uncomment the following lines if you want to redirect the failed
# calls to a different new destination
##if (t_check_status("486|408")) {
## sethostport("192.168.2.100:5060");
## # do not set the missed call flag again
## t_relay();
##}
}


failure_route[2] {
        if (t_was_cancelled()) {
                exit;
        }

        if (t_check_status("486|408|603")) {
            xlog("L_INFO", "load_balancer: Request from $fu to $tu failed.
Re-balancing to 8002!\n");
            lb_disable();
            load_balance("8002", "sip");

            if ($retcode < 0) {
             xlog("L_INFO", "load_balancer: Insufficient resource to balance
request from $fu to $tu . Re-balancing to route 4!\n");
route(4);
            }
    t_on_failure("2");
            t_relay();
}
}
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