From a8481223d638f95eb8e44362af14b9e4b10c2b25 Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Wed, 21 Oct 2020 18:12:31 +0300
Subject: [PATCH] [#60] cmd/neofs-node: Implement primary network State
 instance

Define networkState structure and implement netmap.State interface on it.
Set epoch number on NewEpoch notification from chain. Provide
WithNetworkState option to Put service constructor.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 cmd/neofs-node/config.go |  2 ++
 cmd/neofs-node/netmap.go | 26 ++++++++++++++++++++++++++
 cmd/neofs-node/object.go |  1 +
 3 files changed, 29 insertions(+)

diff --git a/cmd/neofs-node/config.go b/cmd/neofs-node/config.go
index 8d7e2ced1..582bafd7d 100644
--- a/cmd/neofs-node/config.go
+++ b/cmd/neofs-node/config.go
@@ -163,6 +163,8 @@ type cfgNetmap struct {
 	parsers map[event.Type]event.Parser
 
 	subscribers map[event.Type][]event.Handler
+
+	state *networkState
 }
 
 type BootstrapType uint32
diff --git a/cmd/neofs-node/netmap.go b/cmd/neofs-node/netmap.go
index 5f79fdfdb..25036e9ad 100644
--- a/cmd/neofs-node/netmap.go
+++ b/cmd/neofs-node/netmap.go
@@ -5,11 +5,32 @@ import (
 	netmapGRPC "github.com/nspcc-dev/neofs-api-go/v2/netmap/grpc"
 	crypto "github.com/nspcc-dev/neofs-crypto"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+	netmapEvent "github.com/nspcc-dev/neofs-node/pkg/morph/event/netmap"
 	netmapTransportGRPC "github.com/nspcc-dev/neofs-node/pkg/network/transport/netmap/grpc"
 	netmapService "github.com/nspcc-dev/neofs-node/pkg/services/netmap"
 	"github.com/pkg/errors"
+	"go.uber.org/atomic"
 )
 
+// primary solution of local network state dump.
+type networkState struct {
+	epoch *atomic.Uint64
+}
+
+func newNetworkState() *networkState {
+	return &networkState{
+		epoch: atomic.NewUint64(0),
+	}
+}
+
+func (s *networkState) CurrentEpoch() uint64 {
+	return s.epoch.Load()
+}
+
+func (s *networkState) setCurrentEpoch(v uint64) {
+	s.epoch.Store(v)
+}
+
 func initNetmapService(c *cfg) {
 	peerInfo := new(netmap.NodeInfo)
 	peerInfo.SetAddress(c.localAddr.String())
@@ -29,6 +50,11 @@ func initNetmapService(c *cfg) {
 			),
 		),
 	)
+
+	c.cfgNetmap.state = newNetworkState()
+	addNewEpochNotificationHandler(c, func(ev event.Event) {
+		c.cfgNetmap.state.setCurrentEpoch(ev.(netmapEvent.NewEpoch).EpochNumber())
+	})
 }
 
 func bootstrapNode(c *cfg) {
diff --git a/cmd/neofs-node/object.go b/cmd/neofs-node/object.go
index 88dbdc378..76b4dfa31 100644
--- a/cmd/neofs-node/object.go
+++ b/cmd/neofs-node/object.go
@@ -233,6 +233,7 @@ func initObjectService(c *cfg) {
 		putsvc.WithFormatValidatorOpts(
 			objectCore.WithDeleteHandler(objGC),
 		),
+		putsvc.WithNetworkState(c.cfgNetmap.state),
 	)
 
 	sPutV2 := putsvcV2.NewService(