From b4131602965a822afbd5e3567579232f7d33b556 Mon Sep 17 00:00:00 2001
From: Christopher Faulet <cfaulet@haproxy.com>
Date: Mon, 29 Jan 2024 16:41:24 +0100
Subject: [PATCH] MEDIUM: promex: Dump frontends extra counters if requested

Dump extra counter for the frontends. We loop on stats modules and dumped
all concerned counters. The module name is reported with the "mod" label.
---
 addons/promex/service-prometheus.c | 61 ++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/addons/promex/service-prometheus.c b/addons/promex/service-prometheus.c
index 314e7d25f..1fe123dd6 100644
--- a/addons/promex/service-prometheus.c
+++ b/addons/promex/service-prometheus.c
@@ -719,6 +719,67 @@ static int promex_dump_front_metrics(struct appctx *appctx, struct htx *htx)
 		ctx->px = proxies_list;
 	}
 
+	/* Skip extra counters */
+	if (!(ctx->flags & PROMEX_FL_EXTRA_COUNTERS))
+		goto end;
+
+	if (!ctx->mod) {
+		/* no restart point, get the first module in the list */
+		ctx->mod = LIST_NEXT(&stats_module_list[STATS_DOMAIN_PROXY], typeof(ctx->mod), list);
+		ctx->mod_field_num = 0;
+	}
+
+	list_for_each_entry_from(ctx->mod, &stats_module_list[STATS_DOMAIN_PROXY], list) {
+		void *counters;
+
+		if (!(stats_px_get_cap(ctx->mod->domain_flags) & STATS_PX_CAP_FE)) {
+			ctx->field_num += ctx->mod->stats_count;
+			ctx->mod_field_num = 0;
+			continue;
+		}
+
+		for (;ctx->mod_field_num < ctx->mod->stats_count; ctx->mod_field_num++) {
+			while (ctx->px) {
+				struct promex_label labels[PROMEX_MAX_LABELS-1] = {};
+				struct promex_metric metric;
+
+				px = ctx->px;
+
+				labels[0].name  = ist("proxy");
+				labels[0].value = ist2(px->id, strlen(px->id));
+
+				labels[1].name  = ist("mod");
+				labels[1].value = ist2(ctx->mod->name, strlen(ctx->mod->name));
+
+				/* skip the disabled proxies, global frontend and non-networked ones */
+				if ((px->flags & PR_FL_DISABLED) || px->uuid <= 0 || !(px->cap & PR_CAP_FE))
+					goto next_px2;
+
+				counters = EXTRA_COUNTERS_GET(px->extra_counters_fe, ctx->mod);
+				if (!ctx->mod->fill_stats(counters, stats + ctx->field_num, &ctx->mod_field_num))
+					return -1;
+
+				val = stats[ctx->field_num + ctx->mod_field_num];
+				metric.type = ((val.type == FN_GAUGE) ? PROMEX_MT_GAUGE : PROMEX_MT_COUNTER);
+
+				if (!promex_dump_metric(appctx, htx, prefix,
+							ist2(ctx->mod->stats[ctx->mod_field_num].name, strlen(ctx->mod->stats[ctx->mod_field_num].name)),
+							ist2(ctx->mod->stats[ctx->mod_field_num].desc, strlen(ctx->mod->stats[ctx->mod_field_num].desc)),
+							&metric, &val, labels, &out, max))
+					goto full;
+
+			next_px2:
+				ctx->px = px->next;
+			}
+
+			ctx->flags |= PROMEX_FL_METRIC_HDR;
+			ctx->px = proxies_list;
+		}
+
+		ctx->field_num += ctx->mod->stats_count;
+		ctx->mod_field_num = 0;
+	}
+
   end:
 	if (out.len) {
 		if (!htx_add_data_atonce(htx, out))