mirror of https://github.com/poanetwork/quorum.git
165 lines
3.9 KiB
Go
165 lines
3.9 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"fmt"
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"io"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rlp"
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)
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type Engine interface {
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Start() error
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Stop() error
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}
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type State uint64
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const (
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StateAcceptRequest State = iota
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StatePreprepared
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StatePrepared
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StateCommitted
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)
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func (s State) String() string {
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if s == StateAcceptRequest {
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return "Accept request"
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} else if s == StatePreprepared {
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return "Preprepared"
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} else if s == StatePrepared {
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return "Prepared"
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} else if s == StateCommitted {
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return "Committed"
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} else {
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return "Unknown"
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}
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}
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// Cmp compares s and y and returns:
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// -1 if s is the previous state of y
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// 0 if s and y are the same state
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// +1 if s is the next state of y
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func (s State) Cmp(y State) int {
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if uint64(s) < uint64(y) {
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return -1
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}
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if uint64(s) > uint64(y) {
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return 1
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}
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return 0
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}
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const (
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msgPreprepare uint64 = iota
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msgPrepare
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msgCommit
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msgRoundChange
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msgAll
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)
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type message struct {
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Code uint64
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Msg []byte
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Address common.Address
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Signature []byte
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CommittedSeal []byte
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}
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// ==============================================
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//
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// define the functions that needs to be provided for rlp Encoder/Decoder.
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// EncodeRLP serializes m into the Ethereum RLP format.
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func (m *message) EncodeRLP(w io.Writer) error {
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return rlp.Encode(w, []interface{}{m.Code, m.Msg, m.Address, m.Signature, m.CommittedSeal})
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}
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// DecodeRLP implements rlp.Decoder, and load the consensus fields from a RLP stream.
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func (m *message) DecodeRLP(s *rlp.Stream) error {
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var msg struct {
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Code uint64
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Msg []byte
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Address common.Address
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Signature []byte
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CommittedSeal []byte
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}
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if err := s.Decode(&msg); err != nil {
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return err
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}
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m.Code, m.Msg, m.Address, m.Signature, m.CommittedSeal = msg.Code, msg.Msg, msg.Address, msg.Signature, msg.CommittedSeal
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return nil
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}
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// ==============================================
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//
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// define the functions that needs to be provided for core.
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func (m *message) FromPayload(b []byte, validateFn func([]byte, []byte) (common.Address, error)) error {
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// Decode message
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err := rlp.DecodeBytes(b, &m)
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if err != nil {
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return err
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}
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// Validate message (on a message without Signature)
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if validateFn != nil {
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var payload []byte
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payload, err = m.PayloadNoSig()
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if err != nil {
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return err
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}
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_, err = validateFn(payload, m.Signature)
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}
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// Still return the message even the err is not nil
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return err
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}
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func (m *message) Payload() ([]byte, error) {
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return rlp.EncodeToBytes(m)
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}
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func (m *message) PayloadNoSig() ([]byte, error) {
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return rlp.EncodeToBytes(&message{
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Code: m.Code,
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Msg: m.Msg,
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Address: m.Address,
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Signature: []byte{},
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CommittedSeal: m.CommittedSeal,
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})
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}
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func (m *message) Decode(val interface{}) error {
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return rlp.DecodeBytes(m.Msg, val)
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}
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func (m *message) String() string {
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return fmt.Sprintf("{Code: %v, Address: %v}", m.Code, m.Address.String())
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}
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// ==============================================
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//
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// helper functions
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func Encode(val interface{}) ([]byte, error) {
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return rlp.EncodeToBytes(val)
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}
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