I’m not sure if this is by design or not. I have things I want to log to a SQL DB, but it’s not nearly as important as call handling, so the sql_query_async() function looked ideal, but in testing, if the DB is not responsive, the call
processing gets blocked. In the example below, I’m using just a short hostname which isn’t resolvable, but if I have an IP address there that isn’t really assigned (for example if the DB server is down), the same blocking behavior is exhibited, but the error
is slightly different (can’t connect instead of unknown host).
Here’s my config. This specific simple config was tested on Kamailio 5.5, but I observe similar behavior (in a more complicated config) in the dev branch as well.
- - - -
#!KAMAILIO
async_workers=2
loadmodule "db_mysql"
loadmodule "sqlops"
loadmodule "sl"
loadmodule "xlog"
loadmodule "pv"
force_rport=yes
## Host sql does not resolve.
modparam("sqlops","sqlcon","cb=>mysql://kamailio:kamailiorw@sql/kamailio")
## But start anyways.
modparam("sqlops", "connect_mode", 1)
request_route {
sl_send_reply("100", "Trying"); ## Prevent re-transmissions from the UAC
xlog("L_NOTICE", "Time before sql_query_async(): [$TV(Sn)]\n");
sql_query_async("cb", "INSERT INTO table1 (col) VALUES ('val')");
xlog("L_NOTICE", "Time before sl_send_reply(): [$TV(Sn)]\n");
sl_send_reply("404", "Not found");
}
Here’s the log if I send a simple INVITE with SIPp. Note the timestamps
9(16) NOTICE: <script>: Time before sql_query_async(): [1645574694.546165]
9(16) ERROR: db_mysql [km_my_con.c:163]: db_mysql_new_connection(): driver error: Unknown MySQL server host 'sql' (-3)
9(16) ERROR: <core> [db.c:319]: db_do_init2(): could not add connection to the pool
9(16) ERROR: sqlops [sql_api.c:190]: sql_reconnect(): failed to connect to the database [cb]
9(16) ERROR: sqlops [sqlops.c:232]: sql_check_connection(): failed to connect to database
9(16) ERROR: sqlops [sqlops.c:264]: sql_query_async(): invalid connection to database 9(16) NOTICE: <script>: Time before sl_send_reply(): [1645574699.552440]
Ben Kaufman
Sr. VoIP Engineer - BCM One
+1.612.735.9309
24 hour client support: +1.855.639.6300
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