[#496] pkg/innerring: provide wrappers to processors

The only thing we need hashes for is to process notifications.
Balance contract if left for now, as it has some initialization.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

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

@@ -0,0 +1,28 @@
+package wrapper
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
+	netmap2 "github.com/nspcc-dev/neofs-node/pkg/morph/client/netmap"
+)
+
+// Fetch returns current netmap node infos.
+// Consider using pkg/morph/client/netmap for this.
+func (w *Wrapper) Snapshot() (*netmap.Netmap, error) {
+	res, err := w.client.Snapshot(netmap2.GetSnapshotArgs{})
+	if err != nil {
+		return nil, err
+	}
+
+	peers := res.Peers()
+	result := make([]netmap.NodeInfo, len(peers))
+
+	for i := range peers {
+		if err := result[i].Unmarshal(peers[i]); err != nil {
+			return nil, fmt.Errorf("can't unmarshal node info: %w", err)
+		}
+	}
+
+	return netmap.NewNetmap(netmap.NodesFromInfo(result))
+}