Hello,
this is a design limitation of the internal callbacks for pre-config
processing, where "selected" modules can get the request before config
is executed and they can return back if the processing of the request
should continue or not. This mechanism is used by sl module to detect
the ACKs and in such cases it returns "do not process the request
further" and the core stats count it as dropped request.
I expect that this behaviour is there more or less from the beginning of
core:drop_requests, but I also get the point of view that is not really
the case of dropping the request because of error, it is just processing
as it is supposed to be.
Now, as with every "un/expected" behaviour that is there for very very
long time, it is the question about what people consider to be the right
way to move on: keep it as it is (eventually with better docs about it)
because it is what people got use to (and expect to have) or simply
change it ... plus the variant to make a param to control it :-) ...
Cheers,
Daniel
On 03.07.23 15:51, Kaufman wrote:
>
> Just following up on this; Should an ACK absorbed by the SL module
> get counted as a dropped request?
>
>
>
> *Kaufman*
>
>
>
> *From:*Kaufman <bkauf...@bcmone.com>
> *Sent:* Tuesday, June 27, 2023 6:52 PM
> *To:* Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
> *Subject:* [SR-Users] SL absorbed ACK is counted as dropped by
> core.drop_requests
>
>
>
>
>
> Just checking to see if this is the designed behavior. The SL module
> will attempt to match ACKs for stateless replies and handle them
> (absorb them?).
>
>
>
> The question I have is that it looks as though this ACK gets counted
> as dropped by the core.drop_requests from the KEX module. Tested
> using this config:
>
>
>
> *#!KAMAILIO*
>
> * *
>
> *loadmodule "pv"*
>
> *loadmodule "sl"*
>
> *loadmodule "xlog"*
>
> *loadmodule "kex"*
>
> *loadmodule "corex"*
>
> *loadmodule "ctl"*
>
> * *
>
> *modparam("sl", "bind_tm", 0)*
>
> * *
>
> *route {*
>
> * xinfo("[$ci] $rm Request. Src:[$si:$sp] RURI:[$ru] To:[$tu]
> From:[$fu]\n");*
>
> * sl_send_reply("404", "Not Found");*
>
> *}*
>
> * *
>
> *event_route[sl:filtered-ack] {*
>
> * xnotice("sl:filtered-ack ACK [$ci] to local reply absorbed\n");*
>
> *}*
>
>
>
> Then validate by kamcmd stats.fetch core:drop_requests
>
>
>
> Is this the designed and “correct” behavior?
>
>
>
> *Kaufman*
>
>
>
>
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Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
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