identify: add some basic metrics

p2p/host/basic/basic_host.go

@@ -230,12 +230,14 @@ func NewHost(n network.Network, opts *HostOpts) (*BasicHost, error) {
 			identify.UserAgent(opts.UserAgent),
 			identify.ProtocolVersion(opts.ProtocolVersion),
 			identify.DisableSignedPeerRecord(),
+			identify.WithMetricsTracer(identify.NewMetricsTracer()),
 		)
 	} else {
 		h.ids, err = identify.NewIDService(
 			h,
 			identify.UserAgent(opts.UserAgent),
 			identify.ProtocolVersion(opts.ProtocolVersion),
+			identify.WithMetricsTracer(identify.NewMetricsTracer()),
 		)
 	}
 	if err != nil {

p2p/host/resource-manager/obs/stats.go

@@ -8,8 +8,9 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 )
 
+const metricNamespace = "libp2p_rcmgr"
+
 var (
-	metricNamespace = "libp2p_rcmgr"
 
 	// Conns
 	conns = prometheus.NewGaugeVec(prometheus.GaugeOpts{

p2p/metricshelper/dir.go

@@ -0,0 +1,14 @@
+package metricshelper
+
+import "github.com/libp2p/go-libp2p/core/network"
+
+func GetDirection(dir network.Direction) string {
+	switch dir {
+	case network.DirOutbound:
+		return "outbound"
+	case network.DirInbound:
+		return "inbound"
+	default:
+		return "unknown"
+	}
+}

p2p/net/swarm/swarm_metrics.go

@@ -94,17 +94,6 @@ func NewMetricsTracer() *metricsTracer {
 	return &metricsTracer{}
 }
 
-func getDirection(dir network.Direction) string {
-	switch dir {
-	case network.DirOutbound:
-		return "outbound"
-	case network.DirInbound:
-		return "inbound"
-	default:
-		return "unknown"
-	}
-}
-
 func appendConnectionState(tags []string, cs network.ConnectionState) []string {
 	if cs.Transport == "" {
 		// This shouldn't happen, unless the transport doesn't properly set the Transport field in the ConnectionState.
@@ -123,12 +112,12 @@ func (m *metricsTracer) OpenedConnection(dir network.Direction, p crypto.PubKey,
 	tags := metricshelper.GetStringSlice()
 	defer metricshelper.PutStringSlice(tags)
 
-	*tags = append(*tags, getDirection(dir))
+	*tags = append(*tags, metricshelper.GetDirection(dir))
 	*tags = appendConnectionState(*tags, cs)
 	connsOpened.WithLabelValues(*tags...).Inc()
 
 	*tags = (*tags)[:0]
-	*tags = append(*tags, getDirection(dir))
+	*tags = append(*tags, metricshelper.GetDirection(dir))
 	*tags = append(*tags, p.Type().String())
 	keyTypes.WithLabelValues(*tags...).Inc()
 }
@@ -137,12 +126,12 @@ func (m *metricsTracer) ClosedConnection(dir network.Direction, duration time.Du
 	tags := metricshelper.GetStringSlice()
 	defer metricshelper.PutStringSlice(tags)
 
-	*tags = append(*tags, getDirection(dir))
+	*tags = append(*tags, metricshelper.GetDirection(dir))
 	*tags = appendConnectionState(*tags, cs)
 	connsClosed.WithLabelValues(*tags...).Inc()
 
 	*tags = (*tags)[:0]
-	*tags = append(*tags, getDirection(dir))
+	*tags = append(*tags, metricshelper.GetDirection(dir))
 	*tags = appendConnectionState(*tags, cs)
 	connDuration.WithLabelValues(*tags...).Observe(duration.Seconds())
 }