[SR-Users] Http_async_client stops script execution

[Federico Cabiddu]

Hi,
if you are in a transactional contest (as you are since you are calling
t_newtran()), the script execution is suspended, upon calling
http_async_query and resumed in the callback route passed as parameter.
The instructions after the call to http_async_query are never executed. If
you are not in a transactional contest or you explicitly instruct to not
suspend the transaction ($http(suspend) = 0,
http://www.kamailio.org/docs/modules/devel/modules/http_async_client.html#idm1053320700)
they will be executed, and the callback route will be run when the http
reply comes. If you want to use http uqeries to retrieve parameters you
want to use for your routing logic, you need to suspend the transaction and
resume it in the callback.
Hope this clarify.

Best regards,

Federico

On Thu, Sep 27, 2018 at 3:36 PM Denys Pozniak <denys.pozniak at gmail.com>
wrote:

> Hello!
>
> Please help me to understand how http_async_client module behaves. I am
> going to use it for call routing according to the http response.
>
> if (is_method("INVITE")) {
>         t_newtran();
>         xlog("L_ERR", "ASYNC0-$fU-$rU-$rm---- \n");
>         http_set_timeout(1000);
>         http_set_method("POST");
>         http_append_header("Content-Type: application/json");
>         http_async_query("http://10.10.10.10:8080/RPC", "{\"jsonrpc\":
> \"2.0\", \"method\": \"ul.lookup\", \"params\": [\"location\",\"user\"],
> \"id\": 1}", "HTTP_REPLY");
>         xlog("L_ERR", "ASYNC1-$fU-$rU-$rm---- \n");
> }
>
> route[HTTP_REPLY] {
>         xlog("L_ERR", "HTTP_REPLY: ok $http_ok \n");
>         xlog("L_ERR", "HTTP_REPLY: status $http_rs\n");
>         xlog("L_ERR", "HTTP_REPLY: body   $http_rb\n");
>         xlog("L_ERR", "HTTP_REPLY: error  $http_err)\n");
> }
>
>
> In syslog I see HTTP_REPLY log strings with correct response, but do not
> see ASYNC1 string and script execution stops.
>
> What's wrong with this?
>
>
>
> #   kamailio -v
> version: kamailio 4.4.2 (x86_64/linux) 892ad6
> flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS,
> DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC,
> Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX,
> FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
> USE_DST_BLACKLIST, HAVE_RESOLV_RES
> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
> MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
> id: 892ad6
> compiled on 12:58:38 Aug 28 2017 with gcc 4.8.5
>
>
>
>
> --
>
> BR,
> Denys Pozniak
>
>
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