[#276] Merge repo with frostfs-api-go

Signed-off-by: Pavel Pogodaev <p.pogodaev@yadro.com>

api/rpc/message/encoding.go

@@ -0,0 +1,40 @@
+package message
+
+import (
+	"encoding/json"
+)
+
+// GRPCConvertedMessage is an interface
+// of the gRPC message that is used
+// for Message encoding/decoding.
+type GRPCConvertedMessage interface {
+	UnmarshalProtobuf([]byte) error
+}
+
+// Unmarshal decodes m from its Protobuf binary representation
+// via related gRPC message.
+//
+// gm should be tof the same type as the m.ToGRPCMessage() return.
+func Unmarshal(m Message, data []byte, gm GRPCConvertedMessage) error {
+	if err := gm.UnmarshalProtobuf(data); err != nil {
+		return err
+	}
+
+	return m.FromGRPCMessage(gm)
+}
+
+// MarshalJSON encodes m to Protobuf JSON representation.
+func MarshalJSON(m Message) ([]byte, error) {
+	return json.Marshal(m.ToGRPCMessage())
+}
+
+// UnmarshalJSON decodes m from its Protobuf JSON representation
+// via related gRPC message.
+//
+// gm should be tof the same type as the m.ToGRPCMessage() return.
+func UnmarshalJSON(m Message, data []byte, gm any) error {
+	if err := json.Unmarshal(data, gm); err != nil {
+		return err
+	}
+	return m.FromGRPCMessage(gm)
+}