MEDIUM: proxy: remove the unused PR_STFULL state

Since v1.4 or so, it's almost not possible anymore to set this state. The
only exception is by using the CLI to change a frontend's maxconn setting
below its current usage. This case makes no sense, and for other cases it
doesn't make sense either because "full" is a vague concept when only
certain listeners are full and not all. Let's just remove this unused
state and make it clear that it's not reported. The "ready" or "open"
states will continue to be reported without being misleading as they
will be opposed to "stop".

4 files changed, 4 insertions, 12 deletions

diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index 98f6b174c..ba1619f47 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -724,7 +724,7 @@ const struct ist promex_st_metric_desc[ST_F_TOTAL_FIELDS] = {
 	[ST_F_ERESP]          = IST("Total number of response errors."),
 	[ST_F_WRETR]          = IST("Total number of retry warnings."),
 	[ST_F_WREDIS]         = IST("Total number of redispatch warnings."),
-	[ST_F_STATUS]         = IST("Current status of the service (frontend: 0=STOP, 1=UP, 2=FULL - backend: 0=DOWN, 1=UP - server: 0=DOWN, 1=UP, 2=MAINT, 3=DRAIN, 4=NOLB)."),
+	[ST_F_STATUS]         = IST("Current status of the service (frontend: 0=STOP, 1=UP - backend: 0=DOWN, 1=UP - server: 0=DOWN, 1=UP, 2=MAINT, 3=DRAIN, 4=NOLB)."),
 	[ST_F_WEIGHT]         = IST("Service weight."),
 	[ST_F_ACT]            = IST("Current number of active servers."),
 	[ST_F_BCK]            = IST("Current number of backup servers."),
@@ -1551,7 +1551,7 @@ static int promex_dump_front_metrics(struct appctx *appctx, struct htx *htx)
 
 			switch (appctx->st2) {
 				case ST_F_STATUS:
-					metric = mkf_u32(FO_STATUS, px->state == PR_STREADY ? 1 : px->state == PR_STFULL ? 2 : 0);
+					metric = mkf_u32(FO_STATUS, px->state == PR_STREADY ? 1 : 0);
 					break;
 				case ST_F_SCUR:
 					metric = mkf_u32(0, px->feconn);
diff --git a/include/haproxy/proxy-t.h b/include/haproxy/proxy-t.h
index 16fee4a2e..f0c61b3b7 100644
--- a/include/haproxy/proxy-t.h
+++ b/include/haproxy/proxy-t.h
@@ -46,7 +46,6 @@
 enum pr_state {
 	PR_STNEW = 0,           /* proxy has not been initialized yet */
 	PR_STREADY,             /* proxy has been initialized and is ready */
-	PR_STFULL,              /* frontend is full (maxconn reached) */
 	PR_STPAUSED,            /* frontend is paused (during hot restart) */
 	PR_STSTOPPED,           /* proxy is stopped (end of a restart) */
 	PR_STERROR,             /* proxy experienced an unrecoverable error */
diff --git a/src/proxy.c b/src/proxy.c
index a901f53ad..d3c207e71 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -1118,15 +1118,8 @@ struct task *manage_proxy(struct task *t, void *context, unsigned short state)
 		goto out;
 
 	/* check the various reasons we may find to block the frontend */
-	if (unlikely(p->feconn >= p->maxconn)) {
-		if (p->state == PR_STREADY)
-			p->state = PR_STFULL;
+	if (unlikely(p->feconn >= p->maxconn))
 		goto out;
-	}
-
-	/* OK we have no reason to block, so let's unblock if we were blocking */
-	if (p->state == PR_STFULL)
-		p->state = PR_STREADY;
 
 	if (p->fe_sps_lim &&
 	    (wait = next_event_delay(&p->fe_sess_per_sec, p->fe_sps_lim, 0))) {
diff --git a/src/stats.c b/src/stats.c
index 8752788ba..132011d27 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -1629,7 +1629,7 @@ int stats_fill_fe_stats(struct proxy *px, struct field *stats, int len)
 	stats[ST_F_EREQ]     = mkf_u64(FN_COUNTER, px->fe_counters.failed_req);
 	stats[ST_F_DCON]     = mkf_u64(FN_COUNTER, px->fe_counters.denied_conn);
 	stats[ST_F_DSES]     = mkf_u64(FN_COUNTER, px->fe_counters.denied_sess);
-	stats[ST_F_STATUS]   = mkf_str(FO_STATUS, px->state == PR_STREADY ? "OPEN" : px->state == PR_STFULL ? "FULL" : "STOP");
+	stats[ST_F_STATUS]   = mkf_str(FO_STATUS, px->state == PR_STREADY ? "OPEN" : "STOP");
 	stats[ST_F_PID]      = mkf_u32(FO_KEY, relative_pid);
 	stats[ST_F_IID]      = mkf_u32(FO_KEY|FS_SERVICE, px->uuid);
 	stats[ST_F_SID]      = mkf_u32(FO_KEY|FS_SERVICE, 0);