[#476] reputation: Make reputation report async

Add handler closure over worker pool
in the event package.
Add `addNewEpochAsyncNotificationHandler`
function that uses that closure. Pass
the reputation report handler to worker
pool via using that function.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

cmd/neofs-node/netmap.go

@@ -167,10 +167,24 @@ func (c *cfg) localNodeInfoFromNetmap(nm *netmapSDK.Netmap) *netmapSDK.NodeInfo
 	return nil
 }
 
+// addNewEpochNotificationHandler adds handler that will be executed synchronously
 func addNewEpochNotificationHandler(c *cfg, h event.Handler) {
 	addNetmapNotificationHandler(c, newEpochNotification, h)
 }
 
+// addNewEpochAsyncNotificationHandler adds handler that will be executed asynchronously via netmap workerPool
+func addNewEpochAsyncNotificationHandler(c *cfg, h event.Handler) {
+	addNetmapNotificationHandler(
+		c,
+		newEpochNotification,
+		event.WorkerPoolHandler(
+			c.cfgNetmap.workerPool,
+			h,
+			c.log,
+		),
+	)
+}
+
 func goOffline(c *cfg) {
 	err := c.cfgNetmap.wrapper.UpdatePeerState(
 		crypto.MarshalPublicKey(&c.key.PublicKey),

cmd/neofs-node/reputation.go

@@ -309,15 +309,17 @@ func initReputationService(c *cfg) {
 		LocalTrustTarget: router,
 	})
 
-	addNewEpochNotificationHandler(c, func(ev event.Event) {
+	addNewEpochAsyncNotificationHandler(
+		c,
+		func(ev event.Event) {
 			var reportPrm trustcontroller.ReportPrm
 
 			// report collected values from previous epoch
 			reportPrm.SetEpoch(ev.(netmap.NewEpoch).EpochNumber() - 1)
 
-		// TODO: implement and use worker pool [neofs-node#440]
+			c.cfgReputation.localTrustCtrl.Report(reportPrm)
-		go c.cfgReputation.localTrustCtrl.Report(reportPrm)
+		},
-	})
+	)
 
 	v2reputationgrpc.RegisterReputationServiceServer(c.cfgGRPC.server,
 		grpcreputation.New(

pkg/morph/event/utils.go

@@ -1,6 +1,10 @@
 package event
 
-import "github.com/nspcc-dev/neo-go/pkg/util"
+import (
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	util2 "github.com/nspcc-dev/neofs-node/pkg/util"
+	"go.uber.org/zap"
+)
 
 type scriptHashValue struct {
 	hash util.Uint160
@@ -34,3 +38,18 @@ func (s *typeValue) SetType(v Type) {
 func (s typeValue) GetType() Type {
 	return s.typ
 }
+
+// WorkerPoolHandler sets closure over worker pool w with passed handler h.
+func WorkerPoolHandler(w util2.WorkerPool, h Handler, log *zap.Logger) Handler {
+	return func(e Event) {
+		err := w.Submit(func() {
+			h(e)
+		})
+
+		if err != nil {
+			log.Warn("could not Submit handler to worker pool",
+				zap.String("error", err.Error()),
+			)
+		}
+	}
+}