update from v3

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

stats.go

@@ -0,0 +1,49 @@
+package redis
+
+import (
+	"time"
+
+	goredis "github.com/redis/go-redis/v9"
+	"go.unistack.org/micro/v4/meter"
+)
+
+var (
+	PoolHitsTotal        = "pool_hits_total"
+	PoolMissesTotal      = "pool_misses_total"
+	PoolTimeoutTotal     = "pool_timeout_total"
+	PoolConnTotalCurrent = "pool_conn_total_current"
+	PoolConnIdleCurrent  = "pool_conn_idle_current"
+	PoolConnStaleTotal   = "pool_conn_stale_total"
+)
+
+type Statser interface {
+	PoolStats() *goredis.PoolStats
+}
+
+func (r *Store) statsMeter() {
+	var st Statser
+
+	if r.cli != nil {
+		st = r.cli
+	} else {
+		return
+	}
+
+	go func() {
+		ticker := time.NewTicker(meter.DefaultMeterStatsInterval)
+		defer ticker.Stop()
+
+		for range ticker.C {
+			if st == nil {
+				return
+			}
+			stats := st.PoolStats()
+			r.opts.Meter.Counter(PoolHitsTotal).Set(uint64(stats.Hits))
+			r.opts.Meter.Counter(PoolMissesTotal).Set(uint64(stats.Misses))
+			r.opts.Meter.Counter(PoolTimeoutTotal).Set(uint64(stats.Timeouts))
+			r.opts.Meter.Counter(PoolConnTotalCurrent).Set(uint64(stats.TotalConns))
+			r.opts.Meter.Counter(PoolConnIdleCurrent).Set(uint64(stats.IdleConns))
+			r.opts.Meter.Counter(PoolConnStaleTotal).Set(uint64(stats.StaleConns))
+		}
+	}()
+}