[SR-Users] Sharing xavp’s between nodes.

[Daniel-Constantin Mierla]

The xavps are specific for an transaction, even if you replicate them,
it won't make much sense on the other instance if you do not have the
transaction to associate the replicated xavps to it.

One of the xavps related to dispatcher is storing the pointer to the
local socket to be used for sending out (if specified as attribute). In
the past, when dispatcher was using avps, the pointer address was stored
formatted as string. In both cases, old or new, replicating this value
is useless, because it points to the memory of local kamailio. If you
don't set send socket for dispatcher addresses, then this has no effect
for the replication.

Given the above, and once again, replication of xavps makes no sense
without their associated transaction, the way to replicate xavps is to
serialize them to a string, replicate the value using dmq or
uac_req_send() and in the other side deserialize. You can serialize to
parameters format by doing string concatenation and deserialize with
xavp_params_explode(), or serialize to json format and then use
json/jansson modules to deserialize. You can also use embedded scripting
languages to help with serialization/deserialization.

Cheers,
Daniel


On 16.10.18 16:34, Igor Olhovskiy wrote:
> Idea is I’m not sure I can store XAVP in htable due to different data
> types they are handle.
>
> Regards, Igor
> On Oct 15, 2018, 10:39 PM +0300, Henning Westerholt <hw at kamailio.org>,
> wrote:
>> Am Donnerstag, 11. Oktober 2018, 09:21:28 CEST schrieb Igor Olhovskiy:
>>> Is there any possibility to share xavp’s between Kamailio nodes?
>>> Idea is to
>>> share result of ds_select_dst between several nodes and as 5.2 Kamailio
>>> stores result in xavp - need to share this structure as well
>>>
>>> Right now sharing between nodes is done on sht + dmq and I’m not
>>> sure I can
>>> save xavp in sht.
>>
>> Hello Igor,
>>
>> I don't understand your problem completely, sorry. Can't you just
>> access the
>> hash table in a similar way as the xavp? You can of course also just
>> assign
>> the xavp to the htable.
>>
>> Best regards,
>>
>> Henning
>>
>> --
>> Henning Westerholt - https://skalatan.de/blog/
>> Kamailio security assessment - https://skalatan.de/de/assessment
>
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
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