[#227] netmap: Add more encoding methods for `PlacementPolicy`

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

netmap/policy.go

@@ -57,7 +57,48 @@ func (p *PlacementPolicy) readFromV2(m netmap.PlacementPolicy, checkFieldPresenc
 	return nil
 }
 
-// UnmarshalJSON decodes PlacementPolicy from protobuf JSON format.
+// Marshal encodes PlacementPolicy into a binary format of the NeoFS API
+// protocol (Protocol Buffers with direct field order).
+//
+// See also Unmarshal.
+func (p PlacementPolicy) Marshal() []byte {
+	var m netmap.PlacementPolicy
+	p.WriteToV2(&m)
+
+	return m.StableMarshal(nil)
+}
+
+// Unmarshal decodes NeoFS API protocol binary format into the PlacementPolicy
+// (Protocol Buffers with direct field order). Returns an error describing
+// a format violation.
+//
+// See also Marshal.
+func (p *PlacementPolicy) Unmarshal(data []byte) error {
+	var m netmap.PlacementPolicy
+
+	err := m.Unmarshal(data)
+	if err != nil {
+		return err
+	}
+
+	return p.readFromV2(m, false)
+}
+
+// MarshalJSON encodes PlacementPolicy into a JSON format of the NeoFS API
+// protocol (Protocol Buffers JSON).
+//
+// See also UnmarshalJSON.
+func (p PlacementPolicy) MarshalJSON() ([]byte, error) {
+	var m netmap.PlacementPolicy
+	p.WriteToV2(&m)
+
+	return m.MarshalJSON()
+}
+
+// UnmarshalJSON decodes NeoFS API protocol JSON format into the PlacementPolicy
+// (Protocol Buffers JSON). Returns an error describing a format violation.
+//
+// See also MarshalJSON.
 func (p *PlacementPolicy) UnmarshalJSON(data []byte) error {
 	var m netmap.PlacementPolicy
 

netmap/policy_test.go

@@ -1,9 +1,11 @@
-package netmap
+package netmap_test
 
 import (
 	"strings"
 	"testing"
 
+	. "github.com/nspcc-dev/neofs-sdk-go/netmap"
+	netmaptest "github.com/nspcc-dev/neofs-sdk-go/netmap/test"
 	"github.com/stretchr/testify/require"
 )
 
@@ -34,3 +36,24 @@ FILTER City EQ SPB AND SSD EQ true OR City EQ SPB AND Rating GE 5 AS SPBSSD`,
 		require.Equal(t, testCase, b.String())
 	}
 }
+
+func TestPlacementPolicyEncoding(t *testing.T) {
+	v := netmaptest.PlacementPolicy()
+
+	t.Run("binary", func(t *testing.T) {
+		var v2 PlacementPolicy
+		require.NoError(t, v2.Unmarshal(v.Marshal()))
+
+		require.Equal(t, v, v2)
+	})
+
+	t.Run("json", func(t *testing.T) {
+		data, err := v.MarshalJSON()
+		require.NoError(t, err)
+
+		var v2 PlacementPolicy
+		require.NoError(t, v2.UnmarshalJSON(data))
+
+		require.Equal(t, v, v2)
+	})
+}