[SR-Users] Kamailio sending HTTP request to another app

[Victor Torre Antunez]

Hi Alex,

I don't mind blocks SIP execution script, but I need to block only certain
seconds. I´m going to test http_query() function and let you know.

Thanks for the aclaration !


2013/11/18 Alex Balashov <abalashov at evaristesys.com>

> Hi Victor,
>
> Pretty much all HTTP calls, no matter how you architect them, block
> Kamailio SIP worker threads.  There is a low practical limit to the number
> of of SIP worker threads you can have, so this can lead to SIP messages
> being dropped and sluggish response time very quickly.
>
> The exec_avp() function has this liability, as does the http_query()[1]
> function in the 'utils' module, although the http_query() function does
> have a timeout parameter[2] that works, so if a short timeout satisfies
> you, this is a superior alternative to exec_avp().
>
> However, to architect this in a truly asynchronous way, you're either
> going to have to query the thing you want via SIP (i.e. to a SIP redirect
> server) itself, or use some of the newer asynchronous/deferred processing
> features that are already in place[3], or being pushed into the 4.1 branch
> nowadays.  Both options certainly incur greater complexity than using
> http_query(), so if the fact that it has a working timeout setting
> satisfies you, just use that.
>
> -- Alex
>
> [1] http://kamailio.org/docs/modules/4.0.x/modules/utils.html#idm1336
>
> [2] http://kamailio.org/docs/modules/4.0.x/modules/utils.html#idp2631720
>
> [3] http://kamailio.org/docs/modules/devel/modules/async.html
>
> http://kamailio.org/docs/modules/4.1.x/modules/tmx.html#idp15326008
>
>
> On 11/18/2013 09:39 AM, Victor Torre Antunez wrote:
>
>  Hi all,
>>
>> I´m using EXEC Module to execute a HTTP request via curl, to comunicate
>> with another app like this:
>>
>>      exec_avp("curl --connect-timeout 1 --max-time 2
>> http://IP_ADDR:PORT/PATH/'$fU'/'$tU'/'$hdr(Call-ID)'", "$avp(s:output)");
>>
>> Sometimes Kamailio blocks when HTTP server does not response in time,
>> despite the max-time parameter.
>>
>> I found this know issue on EXEC module docs:
>>      "There is currently no guarantee that scripts ever return and stop
>> blocking SIP server. (There is kill.c but it is not used along with the
>> current mechanisms based on popen. Besides that kill.c is ugly)."
>>
>> Does anyone know a better way to communicate Kamailio with a HTTP server
>> without blocks? I will try a python script to send the HTTP request and
>> call it with APP_PYTHON module. Has anyone had blocks with APP_PYTHON
>> module?
>>
>>
>> Thanks in advance.
>>
>> --
>> *Victor*
>>
>>
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>
> --
> Alex Balashov - Principal
> Evariste Systems LLC
> 235 E Ponce de Leon Ave
> Suite 106
> Decatur, GA 30030
> United States
> Tel: +1-678-954-0670
> Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>



-- 

*Victor Torre AntúnezIngeniero de Soporte*

victor.torre at stoneworksolutions.net
0034 925 01 81 06
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20131118/5a9a6554/attachment-0001.html>