MINOR: server: make srv_set_admin_state() capable of telling why this happens
It will be important to help debugging some DNS resolution issues to
know why a server was marked down, so let's make the function support
a 3rd argument with an indication of the reason. Passing NULL will keep
the message as-is.
diff --git a/src/server.c b/src/server.c
index 3aeb557..cf58918 100644
--- a/src/server.c
+++ b/src/server.c
@@ -395,9 +395,10 @@
* one flag at once. The equivalent "inherited" flag is propagated to all
* tracking servers. Maintenance mode disables health checks (but not agent
* checks). When either the flag is already set or no flag is passed, nothing
- * is done.
+ * is done. If <cause> is non-null, it will be displayed at the end of the log
+ * lines to justify the state change.
*/
-void srv_set_admin_flag(struct server *s, enum srv_admin mode)
+void srv_set_admin_flag(struct server *s, enum srv_admin mode, const char *cause)
{
struct check *check = &s->check;
struct server *srv;
@@ -426,8 +427,9 @@
if (s->state == SRV_ST_STOPPED) { /* server was already down */
chunk_printf(&trash,
- "%sServer %s/%s was DOWN and now enters maintenance",
- s->flags & SRV_F_BACKUP ? "Backup " : "", s->proxy->id, s->id);
+ "%sServer %s/%s was DOWN and now enters maintenance%s%s%s",
+ s->flags & SRV_F_BACKUP ? "Backup " : "", s->proxy->id, s->id,
+ cause ? " (" : "", cause ? cause : "", cause ? ")" : "");
srv_append_status(&trash, s, NULL, -1, (mode & SRV_ADMF_FMAINT));
@@ -456,9 +458,10 @@
xferred = pendconn_redistribute(s);
chunk_printf(&trash,
- "%sServer %s/%s is going DOWN for maintenance",
+ "%sServer %s/%s is going DOWN for maintenance%s%s%s",
s->flags & SRV_F_BACKUP ? "Backup " : "",
- s->proxy->id, s->id);
+ s->proxy->id, s->id,
+ cause ? " (" : "", cause ? cause : "", cause ? ")" : "");
srv_append_status(&trash, s, NULL, xferred, (mode & SRV_ADMF_FMAINT));
@@ -488,8 +491,9 @@
*/
xferred = pendconn_redistribute(s);
- chunk_printf(&trash, "%sServer %s/%s enters drain state",
- s->flags & SRV_F_BACKUP ? "Backup " : "", s->proxy->id, s->id);
+ chunk_printf(&trash, "%sServer %s/%s enters drain state%s%s%s",
+ s->flags & SRV_F_BACKUP ? "Backup " : "", s->proxy->id, s->id,
+ cause ? " (" : "", cause ? cause : "", cause ? ")" : "");
srv_append_status(&trash, s, NULL, xferred, (mode & SRV_ADMF_FDRAIN));
@@ -509,7 +513,7 @@
mode = SRV_ADMF_IDRAIN;
for (srv = s->trackers; srv; srv = srv->tracknext)
- srv_set_admin_flag(srv, mode);
+ srv_set_admin_flag(srv, mode, cause);
}
/* Disables admin flag <mode> (among SRV_ADMF_*) on server <s>. This is used to
@@ -743,10 +747,10 @@
for (srv2 = srv->trackers; srv2; srv2 = srv2->tracknext) {
if (srv->admin & (SRV_ADMF_MAINT | SRV_ADMF_CMAINT))
- srv_set_admin_flag(srv2, SRV_ADMF_IMAINT);
+ srv_set_admin_flag(srv2, SRV_ADMF_IMAINT, NULL);
if (srv->admin & SRV_ADMF_DRAIN)
- srv_set_admin_flag(srv2, SRV_ADMF_IDRAIN);
+ srv_set_admin_flag(srv2, SRV_ADMF_IDRAIN, NULL);
}
}