On 8/27/13 12:10 PM, Vitaliy Aleksandrov wrote:
On 08/27/2013 11:57 AM, Daniel-Constantin Mierla
wrote:
Hello,
thanks for the patch. Some remarks.
As you highlighted that the solution is not very efficient (due to no
direct mapping between records and tcp connection), it should have a
way to disable it (maybe via mod param for usrloc).
At this moment is hardcoded for 'location' table, but there can be
other names used, since this value is given as parameter to
save()/lookup(). It will have to iterate through all usrloc tables
(called domains interanlly in the module).
Ok, I'll remove hardcoded
"location" domain. It will search in all
domains from dlist_t. Module parameter will be added too.
I understand that search through the all contacts is not for
production use at all. I really need this feature and I'm sure
everyone who uses tcp/tls/ws too so I wanted to start this discussion
from a little peace of code to get feedback from community.
I understand, I just
proposed a way to move further and improve a bit.
Also, if I
didn't get it wrong, it works only with in-memory records,
if the usrloc is configured in db-only mode, it does not work with
current patch, right?
To remove old contacts i've used delete_ucontact from usrloc api. This
function checks db_mode and removes contact from db in case of DB_ONLY
mode and just updates expiration in case of WRITE_BACK.
But the issue would be that the hash tables will not be in memory, so
you will not get in this way to call the delete_ucontact() function.
This function is called via a different code path for db only mode.
I had in mind
to implement such features, but using timer, to iterate
through tcp connections and see if there is still an open connection
for it. This will do delayed discovery, but I am not sure it will
bring more benefits -- initially I thought is faster lookup done by a
dedicated timer, presumly there are less tcp connections that usrloc
records.
Anyhow, perhaps we should do some optimization
here, we can store the
connection id in usrloc structure and then match received address
only if there is same conenction id. Or add received built from tcp
connection close callback in a list that is used by usrloc expires
timers.
Searching through a single list from a separate process sounds much
better than my version. I'll try to implement this when I have free time.
OK. My thought for the moment would be to keep this list in shared
memory, and then usrloc cleaning-expired-records timers would check if
there is a match for each tcp connection - no matter is expired record
or not, because they iterate anyhow thorugh all records. This will need
a different approach for db only mode as well.
However, other solutions can be proposed and implemented.
The way Olle proposed looks more preferable as it can work in
environment with separate registrar and outbound servers. But I have
to read some theory about outbound before moving this way.
That would be good too,
but the number of devices with SIP Outbound
support is still low out there.
Cheers,
Daniel
--
Daniel-Constantin Mierla -
http://www.asipto.com
http://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
Kamailio Advanced Trainings - Berlin, Oct 21-24; Miami, Nov 11-13, 2013
- more details about Kamailio trainings at
http://www.asipto.com -