[#426] cmd/neofs-node: Add metrics collector in node

Disabled by default.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

cmd/neofs-node/config.go

@@ -58,6 +58,10 @@ const (
 	cfgProfilerAddr   = "pprof.address"
 	cfgProfilerTTL    = "pprof.shutdown_ttl"
 
+	// metrics keys
+	cfgMetricsEnable = "metrics.enabled"
+	cfgMetricsAddr   = "metrics.address"
+
 	// config keys for cfgNodeInfo
 	cfgNodeKey             = "node.key"
 	cfgBootstrapAddress    = "node.address"
@@ -180,6 +184,8 @@ type cfg struct {
 
 	profiler profiler.Profiler
 
+	metrics profiler.Metrics
+
 	workers []worker
 
 	respSvc *response.Service
@@ -414,6 +420,9 @@ func defaultConfiguration(v *viper.Viper) {
 	v.SetDefault(cfgProfilerAddr, ":6060")
 	v.SetDefault(cfgProfilerTTL, "30s")
 
+	v.SetDefault(cfgMetricsEnable, false)
+	v.SetDefault(cfgMetricsAddr, ":9090")
+
 	v.SetDefault(cfgGCQueueSize, 1000)
 	v.SetDefault(cfgGCQueueTick, "5s")
 	v.SetDefault(cfgGCTimeout, "5s")
@@ -448,6 +457,7 @@ func initLocalStorage(c *cfg) {
 
 	ls := engine.New(
 		engine.WithLogger(c.log),
+		engine.WithMetrics(c.viper.GetBool(cfgMetricsEnable)),
 	)
 
 	for _, opts := range c.cfgObject.cfgLocalStorage.shardOpts {

cmd/neofs-node/main.go

@@ -48,6 +48,7 @@ func initApp(c *cfg) {
 	initSessionService(c)
 	initObjectService(c)
 	initProfiler(c)
+	initMetrics(c)
 	initControlService(c)
 
 	fatalOnErr(c.cfgObject.cfgLocalStorage.localStorage.Open())
@@ -61,6 +62,7 @@ func bootUp(c *cfg) {
 	serveGRPC(c)
 	bootstrapNode(c)
 	startWorkers(c)
+	serveMetrics(c)
 }
 
 func wait(c *cfg) {

cmd/neofs-node/metrics.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/util/profiler"
+)
+
+func initMetrics(c *cfg) {
+	c.metrics = profiler.NewMetrics(c.log, c.viper)
+}
+
+func serveMetrics(c *cfg) {
+	if c.metrics != nil {
+		c.metrics.Start(c.ctx)
+	}
+}

cmd/neofs-node/object.go

@@ -299,7 +299,7 @@ func initObjectService(c *cfg) {
 	)
 
 	// build service pipeline
-	// grpc | acl | signature | response | split
+	// grpc | <metrics> | acl | signature | response | split
 
 	splitSvc := objectService.NewTransportSplitter(
 		c.cfgGRPC.maxChunkSize,
@@ -344,8 +344,13 @@ func initObjectService(c *cfg) {
 		acl.WithNetmapState(c.cfgNetmap.state),
 	)
 
+	var firstSvc objectService.ServiceServer = aclSvc
+	if c.viper.GetBool(cfgMetricsEnable) {
+		firstSvc = objectService.NewMetricCollector(aclSvc)
+	}
+
 	objectGRPC.RegisterObjectServiceServer(c.cfgGRPC.server,
-		objectTransportGRPC.New(aclSvc),
+		objectTransportGRPC.New(firstSvc),
 	)
 }