[SR-Users] is $td.did avp a normal avp? - sr-dev

23 Apr 2011

Juha Heinanen writes:

...
  domain module sets $td.did at lookup_domain call. 
$td.did seems to be a
 normal avp, because i can print its value with xlog by referring to it
 as $avp(td.did).  however, its value is gone at failure route, which
 makes me suspect that $td.did is not really a normal avp. 
perhaps this has something to do with the flags of $td.did avp that seem
to be

flags = AVP_TRACK_TO | AVP_CLASS_DOMAIN

i modified avpops avp_print() to print AVP with those flags and called
it at the and of branch route and at the beginning of onerply route.  i
got to syslog

Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9862]: INFO: Printing AVPs in branch route
Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9862]: INFO: avpops [avpops_impl.c:1328]:
p=0xb4797ca0, flags=0x0041
Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9862]: INFO: avpops [avpops_impl.c:1332]:
#011#011#011name=<lcr_id>
Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9862]: INFO: avpops [avpops_impl.c:1342]:
#011#011#011val_int=<1>
Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9862]: INFO: avpops [avpops_impl.c:1328]:
p=0xb4797c10, flags=0x0043
Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9862]: INFO: avpops [avpops_impl.c:1332]:
#011#011#011name=<did>
Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9862]: INFO: avpops [avpops_impl.c:1340]:
#011#011#011val_str=<test.fi / 7>
Apr 23 14:25:52 sip /usr/sbin/sip-proxy[9865]: INFO: Printing AVPs in onreply route

this shows that $td.did was set at the end of branch route, but not at
the beginning of onreply route, which seems to indicate that avps with
flags AVP_TRACK_TO | AVP_CLASS_DOMAIN are not saved/restored with the
transaction.

i then tried to read tm module code and found this kind of line in
t_hooks.c:

set_avp_list(AVP_CLASS_DOMAIN | AVP_TRACK_TO, backup_dom_to );

which seems to indicate that those avps would be saved, but clearly that
is not the case.

i'll switch this to sr-dev list in the hope that there is someone left
who knows what is going on and how also AVP_TRACK_TO | AVP_CLASS_DOMAIN
avps can be saved/restored with the transaction?

-- juha