forked from TrueCloudLab/neoneo-go
155 lines
3.4 KiB
Go
155 lines
3.4 KiB
Go
package consensus
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import (
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"fmt"
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"github.com/CityOfZion/neo-go/pkg/core/transaction"
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"github.com/CityOfZion/neo-go/pkg/crypto/hash"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/util"
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"github.com/pkg/errors"
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)
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type (
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messageType byte
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message struct {
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Type messageType
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ViewNumber byte
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payload io.Serializable
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}
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// Payload is a type for consensus-related messages.
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Payload struct {
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message
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Version uint32
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ValidatorIndex uint16
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PrevHash util.Uint256
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Height uint32
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Timestamp uint32
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Witness transaction.Witness
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}
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)
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const (
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changeViewType messageType = 0x00
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prepareRequestType messageType = 0x20
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prepareResponseType messageType = 0x21
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commitType messageType = 0x30
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recoveryRequestType messageType = 0x40
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recoveryMessageType messageType = 0x41
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)
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// EncodeBinaryUnsigned writes payload to w excluding signature.
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func (p *Payload) EncodeBinaryUnsigned(w *io.BinWriter) {
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w.WriteLE(p.Version)
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w.WriteBE(p.PrevHash[:])
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w.WriteLE(p.Height)
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w.WriteLE(p.ValidatorIndex)
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w.WriteLE(p.Timestamp)
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ww := io.NewBufBinWriter()
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p.message.EncodeBinary(ww.BinWriter)
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w.WriteBytes(ww.Bytes())
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}
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// EncodeBinary implements io.Serializable interface.
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func (p *Payload) EncodeBinary(w *io.BinWriter) {
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p.EncodeBinaryUnsigned(w)
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w.WriteLE(byte(1))
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p.Witness.EncodeBinary(w)
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}
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// DecodeBinaryUnsigned reads payload from w excluding signature.
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func (p *Payload) DecodeBinaryUnsigned(r *io.BinReader) {
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r.ReadLE(&p.Version)
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r.ReadBE(p.PrevHash[:])
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r.ReadLE(&p.Height)
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r.ReadLE(&p.ValidatorIndex)
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r.ReadLE(&p.Timestamp)
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data := r.ReadBytes()
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rr := io.NewBinReaderFromBuf(data)
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p.message.DecodeBinary(rr)
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}
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// Hash returns 32-byte message hash.
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func (p *Payload) Hash() util.Uint256 {
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w := io.NewBufBinWriter()
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p.EncodeBinaryUnsigned(w.BinWriter)
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return hash.DoubleSha256(w.Bytes())
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}
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// DecodeBinary implements io.Serializable interface.
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func (p *Payload) DecodeBinary(r *io.BinReader) {
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p.DecodeBinaryUnsigned(r)
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var b byte
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r.ReadLE(&b)
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if b != 1 {
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r.Err = errors.New("invalid format")
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return
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}
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p.Witness.DecodeBinary(r)
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}
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// EncodeBinary implements io.Serializable interface.
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func (m *message) EncodeBinary(w *io.BinWriter) {
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w.WriteLE(byte(m.Type))
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w.WriteLE(m.ViewNumber)
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m.payload.EncodeBinary(w)
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}
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// DecodeBinary implements io.Serializable interface.
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func (m *message) DecodeBinary(r *io.BinReader) {
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r.ReadLE((*byte)(&m.Type))
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r.ReadLE(&m.ViewNumber)
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switch m.Type {
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case changeViewType:
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cv := new(changeView)
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// NewViewNumber is not marshaled
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cv.NewViewNumber = m.ViewNumber + 1
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m.payload = cv
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case prepareRequestType:
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m.payload = new(prepareRequest)
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case prepareResponseType:
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m.payload = new(prepareResponse)
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case commitType:
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m.payload = new(commit)
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case recoveryRequestType:
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m.payload = new(recoveryRequest)
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case recoveryMessageType:
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m.payload = new(recoveryMessage)
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default:
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r.Err = errors.Errorf("invalid type: 0x%02x", byte(m.Type))
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return
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}
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m.payload.DecodeBinary(r)
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}
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// String implements fmt.Stringer interface.
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func (t messageType) String() string {
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switch t {
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case changeViewType:
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return "ChangeView"
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case prepareRequestType:
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return "PrepareRequest"
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case prepareResponseType:
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return "PrepareResponse"
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case commitType:
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return "Commit"
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case recoveryRequestType:
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return "RecoveryRequest"
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case recoveryMessageType:
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return "RecoveryMessage"
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default:
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return fmt.Sprintf("UNKNOWN(0x%02x)", byte(t))
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}
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}
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