25 Aug
2024
25 Aug
'24
1:48 a.m.
Hello all, context first, we have an REST API that performs queries to
external devices in the network (diameter to DRA's, REST to different
servers) and based on n conditions returns the content for a Contact header
to be used in a SIP 302.
Now we're consuming this API with http_client (synchronously) and as
there's no way to speed up the API (pipeline executions, delays on external
api's etc etc) we're hitting a limit where all children become busy waiting
for the API to answer.
So i decided to move to http_async_client and started working on it on the
lab with this first and base concept to test.
request_route {
#for testing purposes only
if(is_method("ACK")){
exit;
}
$http_req(all) = $null;
$http_req(suspend) = 1;
$http_req(timeout) = 500;
$http_req(method) = "POST";
$http_req(hdr) = "Content-Type: application/json";
jansson_set("string", "event", "sip-routing",
"$var(cre_query)");
xlog("L_INFO","API ASYNC ROUTING REQUEST: $var(cre_query)\n");
$http_req(body) = $var(cre_query);
t_newtran();
http_async_query("http://192.168.86.128:8000/", "CRE_RESPONSE");
}
http://192.168.86.128:8000/ receives the POST, randomly creates a delay
between 0.5 and 1 second and responds (simulating the real api with an
excess delay to probe the concept)
Then
route[CRE_RESPONSE] {
if ($http_ok && $http_rs == 200) {
xlog("L_INFO","CRE RESPONSE: $http_rb\n");
# for testing purpose, Contact content will be replaced from the received
api response
append_to_reply("Contact: <sip:1234@google.com>\r\n");
send_reply(302,"Moved Temporarily");
exit;
}
send_reply(500, "Internal error");
exit;
}
INVITE is received and processed, API is called, after API response, 302 is
replied and then an ACK (ignored by now).
Situation is that the 302 retransmitted
37 1519.846253067 192.168.86.34 → 192.168.86.128 SIP/SDP 585 Request:
INVITE sip:service@192.168.86.128:5060 |
38 1519.848100380 192.168.86.128 → 192.168.86.34 SIP 318 Status: 100
Trying |
39 1520.094997642 192.168.86.128 → 192.168.86.34 SIP 407 Status: 302
Moved Temporarily |
40 1520.102323728 192.168.86.34 → 192.168.86.128 SIP 453 Request: ACK
sip:service@192.168.86.128:5060 |
41 1520.591300933 192.168.86.128 → 192.168.86.34 SIP 407 Status: 302
Moved Temporarily |
42 1521.591061065 192.168.86.128 → 192.168.86.34 SIP 407 Status: 302
Moved Temporarily |
43 1523.591227956 192.168.86.128 → 192.168.86.34 SIP 407 Status: 302
Moved Temporarily |
18(24) DEBUG: tm [t_reply.c:1703]: t_retransmit_reply(): reply
retransmitted. buf=0x7f6d79745dc0: SIP/2.0 3..., shmem=0x7f6d75187fd8:
SIP/2.0 3
18(24) DEBUG: tm [t_reply.c:1703]: t_retransmit_reply(): reply
retransmitted. buf=0x7f6d79745dc0: SIP/2.0 3..., shmem=0x7f6d75187fd8:
SIP/2.0 3
18(24) DEBUG: tm [t_reply.c:1703]: t_retransmit_reply(): reply
retransmitted. buf=0x7f6d79745dc0: SIP/2.0 3..., shmem=0x7f6d75187fd8:
SIP/2.0 3
18(24) DEBUG: tm [timer.c:634]: wait_handler(): finished transaction:
0x7f6d75184cc8 (p:0x7f6d74f600c8/n:0x7f6d74f600c8)
18(24) DEBUG: tm [h_table.c:132]: free_cell_helper(): freeing transaction
0x7f6d75184cc8 from timer.c:643
Any help to avoid the retransmission and make the transaction just finish
right after the 302 will be appreciated.
regards