[#625] client/netmap: remove intermediate wrapper

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

pkg/morph/client/netmap/snapshot.go

@@ -0,0 +1,52 @@
+package netmap
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
+	"github.com/nspcc-dev/neofs-sdk-go/netmap"
+)
+
+// GetNetMap receives information list about storage nodes
+// through the Netmap contract call, composes network map
+// from them and returns it. With diff == 0 returns current
+// network map, else return snapshot of previous network map.
+func (c *Client) GetNetMap(diff uint64) (*netmap.Netmap, error) {
+	return c.getNetMap(diff)
+}
+
+// Snapshot returns current netmap node infos.
+// Consider using pkg/morph/client/netmap for this.
+func (c *Client) Snapshot() (*netmap.Netmap, error) {
+	return c.getNetMap(0)
+}
+
+func (c *Client) getNetMap(diff uint64) (*netmap.Netmap, error) {
+	prm := client.TestInvokePrm{}
+	prm.SetMethod(snapshotMethod)
+	prm.SetArgs(int64(diff))
+
+	res, err := c.client.TestInvoke(prm)
+	if err != nil {
+		return nil, err
+	}
+
+	return unmarshalNetmap(res, snapshotMethod)
+}
+
+func unmarshalNetmap(items []stackitem.Item, method string) (*netmap.Netmap, error) {
+	rawPeers, err := peersFromStackItems(items, method)
+	if err != nil {
+		return nil, err
+	}
+
+	result := make([]netmap.NodeInfo, len(rawPeers))
+	for i := range rawPeers {
+		if err := result[i].Unmarshal(rawPeers[i]); err != nil {
+			return nil, fmt.Errorf("can't unmarshal node info (%s): %w", method, err)
+		}
+	}
+
+	return netmap.NewNetmap(netmap.NodesFromInfo(result))
+}