neoneo-go/pkg/network/payload/extensible.go

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package payload
import (
"errors"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
)
const maxExtensibleCategorySize = 32
// Extensible represents a payload containing arbitrary data.
type Extensible struct {
// Category is the payload type.
Category string
// ValidBlockStart is the starting height for a payload to be valid.
ValidBlockStart uint32
// ValidBlockEnd is the height after which a payload becomes invalid.
ValidBlockEnd uint32
// Sender is the payload sender or signer.
Sender util.Uint160
// Data is custom payload data.
Data []byte
// Witness is payload witness.
Witness transaction.Witness
hash util.Uint256
}
var errInvalidPadding = errors.New("invalid padding")
// NewExtensible creates a new extensible payload.
func NewExtensible() *Extensible {
return &Extensible{}
}
func (e *Extensible) encodeBinaryUnsigned(w *io.BinWriter) {
w.WriteString(e.Category)
w.WriteU32LE(e.ValidBlockStart)
w.WriteU32LE(e.ValidBlockEnd)
w.WriteBytes(e.Sender[:])
w.WriteVarBytes(e.Data)
}
// EncodeBinary implements io.Serializable.
func (e *Extensible) EncodeBinary(w *io.BinWriter) {
e.encodeBinaryUnsigned(w)
w.WriteB(1)
e.Witness.EncodeBinary(w)
}
func (e *Extensible) decodeBinaryUnsigned(r *io.BinReader) {
e.Category = r.ReadString(maxExtensibleCategorySize)
e.ValidBlockStart = r.ReadU32LE()
e.ValidBlockEnd = r.ReadU32LE()
r.ReadBytes(e.Sender[:])
e.Data = r.ReadVarBytes(MaxSize)
}
// DecodeBinary implements io.Serializable.
func (e *Extensible) DecodeBinary(r *io.BinReader) {
e.decodeBinaryUnsigned(r)
if r.ReadB() != 1 {
if r.Err != nil {
return
}
r.Err = errInvalidPadding
return
}
e.Witness.DecodeBinary(r)
}
// Hash returns payload hash.
func (e *Extensible) Hash() util.Uint256 {
if e.hash.Equals(util.Uint256{}) {
e.createHash()
}
return e.hash
}
// createHash creates hashes of the payload.
func (e *Extensible) createHash() {
buf := io.NewBufBinWriter()
e.encodeBinaryUnsigned(buf.BinWriter)
e.hash = hash.Sha256(buf.Bytes())
}