refactor: moving value codecs to a single place (#14912)

types/codec.go

@@ -1,6 +1,8 @@
 package types
 
 import (
+	"cosmossdk.io/collections"
+	"cosmossdk.io/math"
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/codec/types"
 )
@@ -20,3 +22,44 @@ func RegisterLegacyAminoCodec(cdc *codec.LegacyAmino) {
 func RegisterInterfaces(registry types.InterfaceRegistry) {
 	registry.RegisterInterface(MsgInterfaceProtoName, (*Msg)(nil))
 }
+
+// Collection Codecs
+
+// IntValue represents a collections.ValueCodec to work with Int.
+var IntValue collections.ValueCodec[math.Int] = intValueCodec{}
+
+type intValueCodec struct{}
+
+func (i intValueCodec) Encode(value math.Int) ([]byte, error) {
+	return value.Marshal()
+}
+
+func (i intValueCodec) Decode(b []byte) (math.Int, error) {
+	v := new(Int)
+	err := v.Unmarshal(b)
+	if err != nil {
+		return Int{}, err
+	}
+	return *v, nil
+}
+
+func (i intValueCodec) EncodeJSON(value math.Int) ([]byte, error) {
+	return value.MarshalJSON()
+}
+
+func (i intValueCodec) DecodeJSON(b []byte) (Int, error) {
+	v := new(Int)
+	err := v.UnmarshalJSON(b)
+	if err != nil {
+		return Int{}, err
+	}
+	return *v, nil
+}
+
+func (i intValueCodec) Stringify(value Int) string {
+	return value.String()
+}
+
+func (i intValueCodec) ValueType() string {
+	return "math.Int"
+}