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MINOR: backend: add traces for idle connections reuse

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Add traces in connect_server() to debug idle connection reuse. These
are attached to stream trace module, as it's already in use in
backend.c with the macro TRACE_SOURCE.
This commit is contained in:
Amaury Denoyelle 2021-10-20 15:22:01 +02:00
parent 28c5b3c0bc
commit 1252b6f951
1 changed files with 13 additions and 4 deletions
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17
src/backend.c
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@ -1325,13 +1325,17 @@ int connect_server(struct stream *s)
hash = conn_calculate_hash(&hash_params);
/* do not reuse if mode is not http */
if (!IS_HTX_STRM(s))
if (!IS_HTX_STRM(s)) {
DBG_TRACE_STATE("skip idle connections reuse: no htx", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
goto skip_reuse;
}
/* first, search for a matching connection in the session's idle conns */
srv_conn = session_get_conn(s->sess, s->target, hash);
if (srv_conn)
if (srv_conn) {
DBG_TRACE_STATE("reuse connection from session", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
reuse = 1;
}
if (srv && !reuse && reuse_mode != PR_O_REUSE_NEVR) {
/* Below we pick connections from the safe, idle or
@ -1354,8 +1358,10 @@ int connect_server(struct stream *s)
*/
if (!eb_is_empty(&srv->per_thr[tid].avail_conns)) {
srv_conn = srv_lookup_conn(&srv->per_thr[tid].avail_conns, hash);
if (srv_conn)
if (srv_conn) {
DBG_TRACE_STATE("reuse connection from avail", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
reuse = 1;
}
}
/* if no available connections found, search for an idle/safe */
@ -1386,8 +1392,10 @@ int connect_server(struct stream *s)
}
}
if (srv_conn)
if (srv_conn) {
DBG_TRACE_STATE("reuse connection from idle/safe", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
reuse = 1;
}
}
}
@ -1498,6 +1506,7 @@ skip_reuse:
srv_cs = NULL;
if (srv_conn) {
DBG_TRACE_STATE("alloc new be connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
srv_conn->owner = s->sess;
/* connection will be attached to the session if