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109 lines
2.8 KiB
Go
109 lines
2.8 KiB
Go
package transaction
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import (
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"encoding/json"
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/io"
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)
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// Attribute represents a Transaction attribute.
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type Attribute struct {
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Type AttrType
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Value interface {
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io.Serializable
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// toJSONMap is used for embedded json struct marshalling.
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// Anonymous interface fields are not considered anonymous by
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// json lib and marshaling Value together with type makes code
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// harder to follow.
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toJSONMap(map[string]interface{})
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}
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}
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// attrJSON is used for JSON I/O of Attribute.
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type attrJSON struct {
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Type string `json:"type"`
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}
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// DecodeBinary implements the Serializable interface.
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func (attr *Attribute) DecodeBinary(br *io.BinReader) {
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attr.Type = AttrType(br.ReadB())
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switch t := attr.Type; t {
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case HighPriority:
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return
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case OracleResponseT:
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attr.Value = new(OracleResponse)
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case NotValidBeforeT:
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attr.Value = new(NotValidBefore)
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case ConflictsT:
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attr.Value = new(Conflicts)
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case NotaryAssistedT:
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attr.Value = new(NotaryAssisted)
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default:
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if t >= ReservedLowerBound && t <= ReservedUpperBound {
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attr.Value = new(Reserved)
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break
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}
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br.Err = fmt.Errorf("failed decoding TX attribute usage: 0x%2x", int(attr.Type))
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return
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}
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attr.Value.DecodeBinary(br)
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}
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// EncodeBinary implements the Serializable interface.
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func (attr *Attribute) EncodeBinary(bw *io.BinWriter) {
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bw.WriteB(byte(attr.Type))
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switch t := attr.Type; t {
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case HighPriority:
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case OracleResponseT, NotValidBeforeT, ConflictsT, NotaryAssistedT:
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attr.Value.EncodeBinary(bw)
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default:
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if t >= ReservedLowerBound && t <= ReservedUpperBound {
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attr.Value.EncodeBinary(bw)
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break
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}
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bw.Err = fmt.Errorf("failed encoding TX attribute usage: 0x%2x", attr.Type)
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}
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}
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// MarshalJSON implements the json Marshaller interface.
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func (attr *Attribute) MarshalJSON() ([]byte, error) {
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m := map[string]interface{}{"type": attr.Type.String()}
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if attr.Value != nil {
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attr.Value.toJSONMap(m)
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}
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return json.Marshal(m)
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}
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// UnmarshalJSON implements the json.Unmarshaller interface.
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func (attr *Attribute) UnmarshalJSON(data []byte) error {
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aj := new(attrJSON)
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err := json.Unmarshal(data, aj)
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if err != nil {
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return err
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}
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switch aj.Type {
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case HighPriority.String():
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attr.Type = HighPriority
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return nil
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case OracleResponseT.String():
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attr.Type = OracleResponseT
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// Note: because `type` field will not be present in any attribute
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// value, we can unmarshal the same data. The overhead is minimal.
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attr.Value = new(OracleResponse)
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case NotValidBeforeT.String():
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attr.Type = NotValidBeforeT
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attr.Value = new(NotValidBefore)
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case ConflictsT.String():
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attr.Type = ConflictsT
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attr.Value = new(Conflicts)
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case NotaryAssistedT.String():
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attr.Type = NotaryAssistedT
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attr.Value = new(NotaryAssisted)
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default:
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return errors.New("wrong Type")
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}
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return json.Unmarshal(data, attr.Value)
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}
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