[#132] Add netmap cleanup event processor

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

pkg/innerring/processors/netmap/process_cleanup.go

@@ -0,0 +1,42 @@
+package netmap
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neofs-api-go/v2/netmap"
+	"github.com/nspcc-dev/neofs-node/pkg/innerring/invoke"
+	"go.uber.org/zap"
+)
+
+func (np *Processor) processNetmapCleanupTick(epoch uint64) {
+	if !np.activeState.IsActive() {
+		np.log.Info("passive mode, ignore new netmap cleanup tick")
+
+		return
+	}
+
+	err := np.netmapSnapshot.forEachRemoveCandidate(epoch, func(s string) error {
+		key, err := keys.NewPublicKeyFromString(s)
+		if err != nil {
+			np.log.Warn("can't decode public key of netmap node",
+				zap.String("key", s))
+
+			return nil
+		}
+
+		np.log.Info("vote to remove node from netmap", zap.String("key", s))
+
+		err = invoke.UpdatePeerState(np.morphClient, np.netmapContract, &invoke.UpdatePeerArgs{
+			Key:    key,
+			Status: uint32(netmap.Offline),
+		})
+		if err != nil {
+			np.log.Error("can't invoke netmap.UpdateState", zap.Error(err))
+		}
+
+		return nil
+	})
+	if err != nil {
+		np.log.Warn("can't iterate on netmap cleaner cache",
+			zap.String("error", err.Error()))
+	}
+}