Extract metrics reporter from Server

pkg/reporters/metrics/metrics_reporter.go

@@ -0,0 +1,60 @@
+package metrics
+
+import (
+	"github.com/criticalstack/quake-kube/internal/quake/net"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var (
+	activePlayers = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "quake_active_players",
+		Help: "The current number of active players",
+	})
+
+	scores = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "quake_player_scores",
+		Help: "Current scores by player, by map",
+	}, []string{"player", "map"})
+
+	pings = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "quake_player_pings",
+		Help: "Current ping by player",
+	}, []string{"player"})
+
+	configReloads = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "quake_config_reloads",
+		Help: "Config file reload count",
+	})
+)
+
+type StatusMetrics struct {
+	MapName string
+	Players []net.Player
+}
+
+func ConfigReloads() prometheus.Counter {
+	return configReloads
+}
+
+func Pings() *prometheus.GaugeVec {
+	return pings
+}
+
+func Scores() *prometheus.GaugeVec {
+	return scores
+}
+
+func ActivePlayers() prometheus.Gauge {
+	return activePlayers
+}
+
+func Report(metrics *StatusMetrics) {
+	ActivePlayers().Set(float64(len(metrics.Players)))
+	for _, p := range metrics.Players {
+		if len(metrics.MapName) > 0 {
+			Scores().WithLabelValues(p.Name, metrics.MapName).Set(float64(p.Score))
+		}
+		Pings().WithLabelValues(p.Name).Set(float64(p.Ping))
+	}
+}