[#298] cmd/node: Go offline on application shutdown

Transfer the state of the node to offline when the application is shut down.
Updating the state is done by calling UpdateState method of Netmap contract.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-node/main.go

@@ -64,5 +64,7 @@ func shutdown(c *cfg) {
 
 	c.log.Info("gRPC server stopped")
 
+	goOffline(c)
+
 	c.wg.Wait()
 }

cmd/neofs-node/netmap.go

@@ -4,6 +4,7 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
 	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/client/netmap/wrapper"
 	"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"
@@ -114,3 +115,18 @@ func initState(c *cfg) {
 func addNewEpochNotificationHandler(c *cfg, h event.Handler) {
 	addNetmapNotificationHandler(c, newEpochNotification, h)
 }
+
+func goOffline(c *cfg) {
+	err := c.cfgNetmap.wrapper.UpdatePeerState(
+		crypto.MarshalPublicKey(&c.key.PublicKey),
+		wrapper.StateOffline,
+	)
+
+	if err != nil {
+		c.log.Error("could not go offline",
+			zap.String("error", err.Error()),
+		)
+	} else {
+		c.log.Info("request to go offline successfully sent")
+	}
+}