[#645] core/client: Implement helper functions to fill NodeInfo

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

pkg/core/client/util.go

@@ -0,0 +1,42 @@
+package client
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+)
+
+func nodeInfoFromKeyAddr(dst *NodeInfo, k []byte, a network.AddressGroup) {
+	dst.SetPublicKey(k)
+	dst.SetAddressGroup(a)
+}
+
+// NodeInfoFromRawNetmapElement fills NodeInfo structure from the interface of raw netmap member's descriptor.
+//
+// Args must not be nil.
+func NodeInfoFromRawNetmapElement(dst *NodeInfo, info interface {
+	PublicKey() []byte
+	IterateAddresses(func(string) bool)
+	NumberOfAddresses() int
+}) error {
+	var a network.AddressGroup
+
+	err := a.FromIterator(info)
+	if err != nil {
+		return fmt.Errorf("parse network address: %w", err)
+	}
+
+	nodeInfoFromKeyAddr(dst, info.PublicKey(), a)
+
+	return nil
+}
+
+// NodeInfoFromNetmapElement fills NodeInfo structure from the interface of parsed netmap member's descriptor.
+//
+// Args must not be nil.
+func NodeInfoFromNetmapElement(dst *NodeInfo, info interface {
+	PublicKey() []byte
+	Addresses() network.AddressGroup
+}) {
+	nodeInfoFromKeyAddr(dst, info.PublicKey(), info.Addresses())
+}