<div dir="ltr">Hi All,<div><br></div><div>I've been doing some work this week with the new http_async_client module, it seems that with it's default behaviour it's not possible to execute another async query in the block immediately following the response, for example the following config:<br><br><div><font face="monospace, monospace">request_route {</font></div><div><font face="monospace, monospace"> if (!t_newtran()) {</font></div><div><font face="monospace, monospace"> sl_reply_error();</font></div><div><font face="monospace, monospace"> exit();</font></div><div><font face="monospace, monospace"> }</font></div><div><font face="monospace, monospace"> http_async_query("<a href="http://localhost:8090/req_1">http://localhost:8090/req_1</a>", '{"user":"$fU"}', "REQ_1");</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">route[REQ_1] {</font></div><div><font face="monospace, monospace"> xlog("L_INFO", "route[REQ_1]: INIT\n");</font></div><div><font face="monospace, monospace"> if ($http_ok) {</font></div><div><font face="monospace, monospace"> xlog("L_INFO", "route[REQ_1]: status $http_rs\n");</font></div><div><font face="monospace, monospace"> xlog("L_INFO", "route[REQ_1]: Sending REQ_2\n");</font></div><div><font face="monospace, monospace"> http_async_query("<a href="http://localhost:8090/req_2">http://localhost:8090/req_2</a>", '{"user":"$fU"}', "REQ_2");</font></div><div><font face="monospace, monospace"> } else {</font></div><div><font face="monospace, monospace"> xlog("L_INFO", "route[REQ_1]: error $http_err)\n");</font></div><div><font face="monospace, monospace"> }</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">route[REQ_2] {</font></div><div><font face="monospace, monospace"> xlog("L_INFO", "route[REQ_2]: INIT\n");</font></div><div><font face="monospace, monospace"> if ($http_ok) {</font></div><div><font face="monospace, monospace"> xlog("L_INFO", "route[REQ_2]: status $http_rs\n");</font></div><div><font face="monospace, monospace"> } else {</font></div><div><font face="monospace, monospace"> xlog("L_INFO", "route[REQ_2]: error $http_err)\n");</font></div><div><font face="monospace, monospace"> }</font></div><div><font face="monospace, monospace">}</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="arial, helvetica, sans-serif">Generates the following error:</font></div><div><font face="monospace, monospace"><br></font></div><div><div style="font-family:monospace,monospace">10(11832) INFO: <script>: route[REQ_1]: INIT</div><div style="font-family:monospace,monospace">10(11832) INFO: <script>: route[REQ_1]: status 200</div><div style="font-family:monospace,monospace">10(11832) INFO: <script>: route[REQ_1]: Sending REQ_2</div><div style="font-family:monospace,monospace">10(11832) WARNING: tm [t_suspend.c:186]: t_continue(): transaction is not suspended [53195:560306836]</div><div style="font-family:monospace,monospace"><br></div></div><div><font face="arial, helvetica, sans-serif">Looking at the source, http_async_client calls t_suspend, then goes away and performs the request in the background. On response it calls t_continue and then <a href="https://github.com/kamailio/kamailio/blob/4.4/modules/tm/t_suspend.c#L270-L275">this block</a> in t_continue will continue execution, the second query will cause http_async_client to call t_suspend whilst sill executing from the previous t_continue. Once they query is sent, the first t_continue will complete, removing the T_ASYNC_SUSPENDED flag. When the second query returns it doesn't find the flag and so fails as shown.</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">I'm far from an expect on this so would really appreciate some pointers, it seems to fundamental to be a race condition in tm but the usage in http_async_client seems to match usage in other modules so I'm not sure on the best tactic.</font></div><div><font face="arial, helvetica, sans-serif">I've tried peppering append_branch and async_route call's in various places to no avail.</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">Full debug log here: <a href="http://pastebin.com/raw/rFmm0fmf">http://pastebin.com/raw/rFmm0fmf</a></font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">Any help appreciated,</font></div><div><div class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p style="color:rgb(136,136,136)"><b style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;font-size:small">Thom Seddon</b></p></div></div></div></div></div>
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