transaction: attribute type is now type, not usage

pkg/core/transaction/attr_usage.go

@@ -1,10 +0,0 @@
-package transaction
-
-//go:generate stringer -type=AttrUsage
-
-// AttrUsage represents the purpose of the attribute.
-type AttrUsage uint8
-
-// List of valid attribute usages (none for preview3).
-//const (
-//)

pkg/core/transaction/attribute.go

@@ -10,26 +10,26 @@ import (
 
 // Attribute represents a Transaction attribute.
 type Attribute struct {
-	Usage AttrUsage
+	Type AttrType
 	Data []byte
 }
 
 // attrJSON is used for JSON I/O of Attribute.
 type attrJSON struct {
-	Usage string `json:"usage"`
+	Type string `json:"type"`
 	Data string `json:"data"`
 }
 
 // DecodeBinary implements Serializable interface.
 func (attr *Attribute) DecodeBinary(br *io.BinReader) {
-	attr.Usage = AttrUsage(br.ReadB())
+	attr.Type = AttrType(br.ReadB())
 
 	var datasize uint64
 	/**
 
-	switch attr.Usage {
+	switch attr.Type {
 	default:
-		br.Err = fmt.Errorf("failed decoding TX attribute usage: 0x%2x", int(attr.Usage))
+		br.Err = fmt.Errorf("failed decoding TX attribute usage: 0x%2x", int(attr.Type))
 		return
 	}
 	*/
@@ -39,17 +39,17 @@ func (attr *Attribute) DecodeBinary(br *io.BinReader) {
 
 // EncodeBinary implements Serializable interface.
 func (attr *Attribute) EncodeBinary(bw *io.BinWriter) {
-	bw.WriteB(byte(attr.Usage))
-	switch attr.Usage {
+	bw.WriteB(byte(attr.Type))
+	switch attr.Type {
 	default:
-		bw.Err = fmt.Errorf("failed encoding TX attribute usage: 0x%2x", attr.Usage)
+		bw.Err = fmt.Errorf("failed encoding TX attribute usage: 0x%2x", attr.Type)
 	}
 }
 
 // MarshalJSON implements the json Marshaller interface.
 func (attr *Attribute) MarshalJSON() ([]byte, error) {
 	return json.Marshal(attrJSON{
-		Usage: "", // attr.Usage.String() when we're to have some real attributes
+		Type: "", // attr.Type.String() when we're to have some real attributes
 		Data: base64.StdEncoding.EncodeToString(attr.Data),
 	})
 }
@@ -66,9 +66,9 @@ func (attr *Attribute) UnmarshalJSON(data []byte) error {
 		return err
 	}
 	/**
-	switch aj.Usage {
+	switch aj.Type {
 	default:
-		return errors.New("wrong Usage")
+		return errors.New("wrong Type")
 
 	}
 	*/

pkg/core/transaction/attrtype.go

@@ -0,0 +1,10 @@
+package transaction
+
+//go:generate stringer -type=AttrType
+
+// AttrType represents the purpose of the attribute.
+type AttrType uint8
+
+// List of valid attribute types (none for preview3).
+//const (
+//)