On 18 Nov 2013, at 15:45, Alex Balashov <abalas...@evaristesys.com> wrote:
> 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 json-rpc module has what I believe is an asynch http call, returning in another route block. I've mailed earlier about all our HTTP clients. There's a mess that needs someone to clean out. /O > > 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@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@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
