[#378] netmap: Add binary encoding for NetworkInfo type

Define `Marshal` / `Unmarshal` methods of the `NetworkInfo` type.

Signed-off-by: Leonard Lyubich <ctulhurider@gmail.com>

netmap/network_info.go

@@ -112,6 +112,33 @@ func (x NetworkInfo) WriteToV2(m *netmap.NetworkInfo) {
 	*m = x.m
 }
 
+// Marshal encodes NetworkInfo into a binary format of the NeoFS API protocol
+// (Protocol Buffers with direct field order).
+//
+// See also Unmarshal.
+func (x NetworkInfo) Marshal() []byte {
+	var m netmap.NetworkInfo
+	x.WriteToV2(&m)
+
+	return m.StableMarshal(nil)
+}
+
+// Unmarshal decodes NeoFS API protocol binary format into the NetworkInfo
+// (Protocol Buffers with direct field order). Returns an error describing
+// a format violation.
+//
+// See also Marshal.
+func (x *NetworkInfo) Unmarshal(data []byte) error {
+	var m netmap.NetworkInfo
+
+	err := m.Unmarshal(data)
+	if err != nil {
+		return err
+	}
+
+	return x.readFromV2(m, false)
+}
+
 // CurrentEpoch returns epoch set using SetCurrentEpoch.
 //
 // Zero NetworkInfo has zero current epoch.

netmap/network_info_test.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/nspcc-dev/neofs-api-go/v2/netmap"
 	. "github.com/nspcc-dev/neofs-sdk-go/netmap"
+	netmaptest "github.com/nspcc-dev/neofs-sdk-go/netmap/test"
 	"github.com/stretchr/testify/require"
 )
 
@@ -251,3 +252,12 @@ func TestNetworkInfo_MaintenanceModeAllowed(t *testing.T) {
 		},
 	)
 }
+
+func TestNetworkInfo_Marshal(t *testing.T) {
+	v := netmaptest.NetworkInfo()
+
+	var v2 NetworkInfo
+	require.NoError(t, v2.Unmarshal(v.Marshal()))
+
+	require.Equal(t, v, v2)
+}