neo-go/pkg/consensus/payload.go

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package consensus
import (
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"crypto/sha256"
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"fmt"
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"github.com/CityOfZion/neo-go/pkg/core"
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"github.com/CityOfZion/neo-go/pkg/core/transaction"
"github.com/CityOfZion/neo-go/pkg/crypto/hash"
"github.com/CityOfZion/neo-go/pkg/io"
"github.com/CityOfZion/neo-go/pkg/util"
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"github.com/CityOfZion/neo-go/pkg/vm"
"github.com/CityOfZion/neo-go/pkg/vm/opcode"
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"github.com/nspcc-dev/dbft/payload"
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"github.com/pkg/errors"
)
type (
messageType byte
message struct {
Type messageType
ViewNumber byte
payload io.Serializable
}
// Payload is a type for consensus-related messages.
Payload struct {
message
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version uint32
validatorIndex uint16
prevHash util.Uint256
height uint32
timestamp uint32
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Witness transaction.Witness
}
)
const (
changeViewType messageType = 0x00
prepareRequestType messageType = 0x20
prepareResponseType messageType = 0x21
commitType messageType = 0x30
recoveryRequestType messageType = 0x40
recoveryMessageType messageType = 0x41
)
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// ViewNumber implements payload.ConsensusPayload interface.
func (p Payload) ViewNumber() byte {
return p.message.ViewNumber
}
// SetViewNumber implements payload.ConsensusPayload interface.
func (p *Payload) SetViewNumber(view byte) {
p.message.ViewNumber = view
}
// Type implements payload.ConsensusPayload interface.
func (p Payload) Type() payload.MessageType {
return payload.MessageType(p.message.Type)
}
// SetType implements payload.ConsensusPayload interface.
func (p *Payload) SetType(t payload.MessageType) {
p.message.Type = messageType(t)
}
// Payload implements payload.ConsensusPayload interface.
func (p Payload) Payload() interface{} {
return p.payload
}
// SetPayload implements payload.ConsensusPayload interface.
func (p *Payload) SetPayload(pl interface{}) {
p.payload = pl.(io.Serializable)
}
// GetChangeView implements payload.ConsensusPayload interface.
func (p Payload) GetChangeView() payload.ChangeView { return p.payload.(payload.ChangeView) }
// GetPrepareRequest implements payload.ConsensusPayload interface.
func (p Payload) GetPrepareRequest() payload.PrepareRequest {
return p.payload.(payload.PrepareRequest)
}
// GetPrepareResponse implements payload.ConsensusPayload interface.
func (p Payload) GetPrepareResponse() payload.PrepareResponse {
return p.payload.(payload.PrepareResponse)
}
// GetCommit implements payload.ConsensusPayload interface.
func (p Payload) GetCommit() payload.Commit { return p.payload.(payload.Commit) }
// GetRecoveryRequest implements payload.ConsensusPayload interface.
func (p Payload) GetRecoveryRequest() payload.RecoveryRequest {
return p.payload.(payload.RecoveryRequest)
}
// GetRecoveryMessage implements payload.ConsensusPayload interface.
func (p Payload) GetRecoveryMessage() payload.RecoveryMessage {
return p.payload.(payload.RecoveryMessage)
}
// MarshalUnsigned implements payload.ConsensusPayload interface.
func (p Payload) MarshalUnsigned() []byte {
w := io.NewBufBinWriter()
p.EncodeBinaryUnsigned(w.BinWriter)
return w.Bytes()
}
// UnmarshalUnsigned implements payload.ConsensusPayload interface.
func (p *Payload) UnmarshalUnsigned(data []byte) error {
r := io.NewBinReaderFromBuf(data)
p.DecodeBinaryUnsigned(r)
return r.Err
}
// Version implements payload.ConsensusPayload interface.
func (p Payload) Version() uint32 {
return p.version
}
// SetVersion implements payload.ConsensusPayload interface.
func (p *Payload) SetVersion(v uint32) {
p.version = v
}
// ValidatorIndex implements payload.ConsensusPayload interface.
func (p Payload) ValidatorIndex() uint16 {
return p.validatorIndex
}
// SetValidatorIndex implements payload.ConsensusPayload interface.
func (p *Payload) SetValidatorIndex(i uint16) {
p.validatorIndex = i
}
// PrevHash implements payload.ConsensusPayload interface.
func (p Payload) PrevHash() util.Uint256 {
return p.prevHash
}
// SetPrevHash implements payload.ConsensusPayload interface.
func (p *Payload) SetPrevHash(h util.Uint256) {
p.prevHash = h
}
// Height implements payload.ConsensusPayload interface.
func (p Payload) Height() uint32 {
return p.height
}
// SetHeight implements payload.ConsensusPayload interface.
func (p *Payload) SetHeight(h uint32) {
p.height = h
}
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// EncodeBinaryUnsigned writes payload to w excluding signature.
func (p *Payload) EncodeBinaryUnsigned(w *io.BinWriter) {
w.WriteU32LE(p.version)
w.WriteBytes(p.prevHash[:])
w.WriteU32LE(p.height)
w.WriteU16LE(p.validatorIndex)
w.WriteU32LE(p.timestamp)
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ww := io.NewBufBinWriter()
p.message.EncodeBinary(ww.BinWriter)
w.WriteVarBytes(ww.Bytes())
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}
// EncodeBinary implements io.Serializable interface.
func (p *Payload) EncodeBinary(w *io.BinWriter) {
p.EncodeBinaryUnsigned(w)
w.WriteB(1)
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p.Witness.EncodeBinary(w)
}
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// Sign signs payload using the private key.
// It also sets corresponding verification and invocation scripts.
func (p *Payload) Sign(key *privateKey) error {
sig, err := key.Sign(p.MarshalUnsigned())
if err != nil {
return err
}
p.Witness.InvocationScript = append([]byte{byte(opcode.PUSHBYTES64)}, sig...)
p.Witness.VerificationScript = key.PublicKey().GetVerificationScript()
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return nil
}
// Verify verifies payload using provided Witness.
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func (p *Payload) Verify(scriptHash util.Uint160) bool {
verification, err := core.ScriptFromWitness(scriptHash, &p.Witness)
if err != nil {
return false
}
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v := vm.New()
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h := sha256.Sum256(p.MarshalUnsigned())
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v.SetCheckedHash(h[:])
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v.LoadScript(verification)
v.LoadScript(p.Witness.InvocationScript)
err = v.Run()
if err != nil || v.HasFailed() || v.Estack().Len() != 1 {
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return false
}
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res, err := v.Estack().Pop().TryBool()
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return err == nil && res
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}
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// DecodeBinaryUnsigned reads payload from w excluding signature.
func (p *Payload) DecodeBinaryUnsigned(r *io.BinReader) {
p.version = r.ReadU32LE()
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r.ReadBytes(p.prevHash[:])
p.height = r.ReadU32LE()
p.validatorIndex = r.ReadU16LE()
p.timestamp = r.ReadU32LE()
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data := r.ReadVarBytes()
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if r.Err != nil {
return
}
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rr := io.NewBinReaderFromBuf(data)
p.message.DecodeBinary(rr)
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r.Err = rr.Err
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}
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// Hash implements payload.ConsensusPayload interface.
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func (p *Payload) Hash() util.Uint256 {
w := io.NewBufBinWriter()
p.EncodeBinaryUnsigned(w.BinWriter)
return hash.DoubleSha256(w.Bytes())
}
// DecodeBinary implements io.Serializable interface.
func (p *Payload) DecodeBinary(r *io.BinReader) {
p.DecodeBinaryUnsigned(r)
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if r.Err != nil {
return
}
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var b = r.ReadB()
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if b != 1 {
r.Err = errors.New("invalid format")
return
}
p.Witness.DecodeBinary(r)
}
// EncodeBinary implements io.Serializable interface.
func (m *message) EncodeBinary(w *io.BinWriter) {
w.WriteBytes([]byte{byte(m.Type)})
w.WriteB(m.ViewNumber)
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m.payload.EncodeBinary(w)
}
// DecodeBinary implements io.Serializable interface.
func (m *message) DecodeBinary(r *io.BinReader) {
m.Type = messageType(r.ReadB())
m.ViewNumber = r.ReadB()
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switch m.Type {
case changeViewType:
cv := new(changeView)
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// newViewNumber is not marshaled
cv.newViewNumber = m.ViewNumber + 1
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m.payload = cv
case prepareRequestType:
m.payload = new(prepareRequest)
case prepareResponseType:
m.payload = new(prepareResponse)
case commitType:
m.payload = new(commit)
case recoveryRequestType:
m.payload = new(recoveryRequest)
case recoveryMessageType:
m.payload = new(recoveryMessage)
default:
r.Err = errors.Errorf("invalid type: 0x%02x", byte(m.Type))
return
}
m.payload.DecodeBinary(r)
}
// String implements fmt.Stringer interface.
func (t messageType) String() string {
switch t {
case changeViewType:
return "ChangeView"
case prepareRequestType:
return "PrepareRequest"
case prepareResponseType:
return "PrepareResponse"
case commitType:
return "Commit"
case recoveryRequestType:
return "RecoveryRequest"
case recoveryMessageType:
return "RecoveryMessage"
default:
return fmt.Sprintf("UNKNOWN(0x%02x)", byte(t))
}
}