Add Inner Ring code

pkg/morph/client/netmap/wrapper/new_epoch.go

@@ -0,0 +1,23 @@
+package wrapper
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/core/netmap/epoch"
+	contract "github.com/nspcc-dev/neofs-node/pkg/morph/client/netmap"
+	"github.com/pkg/errors"
+)
+
+// NewEpoch updates NeoFS epoch number through
+// Netmap contract call.
+func (w *Wrapper) NewEpoch(e epoch.Epoch) error {
+	// prepare invocation arguments
+	args := contract.NewEpochArgs{}
+	args.SetEpochNumber(int64(epoch.ToUint64(e)))
+
+	// invoke smart contract call
+	//
+	// Note: errors.Wrap returns nil on nil error arg.
+	return errors.Wrap(
+		w.client.NewEpoch(args),
+		"could not invoke smart contract",
+	)
+}