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preprepare.go
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preprepare.go
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// Modifications Copyright 2018 The klaytn Authors
// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
//
// This file is derived from quorum/consensus/istanbul/core/preprepare.go (2018/06/04).
// Modified and improved for the klaytn development.
package core
import (
"github.com/klaytn/klaytn/blockchain/types"
"github.com/klaytn/klaytn/consensus"
"github.com/klaytn/klaytn/consensus/istanbul"
"time"
)
func (c *core) sendPreprepare(request *istanbul.Request) {
logger := c.logger.NewWith("state", c.state)
header := types.SetRoundToHeader(request.Proposal.Header(), c.currentView().Round.Int64())
request.Proposal = request.Proposal.WithSeal(header)
// If I'm the proposer and I have the same sequence with the proposal
if c.current.Sequence().Cmp(request.Proposal.Number()) == 0 && c.isProposer() {
curView := c.currentView()
preprepare, err := Encode(&istanbul.Preprepare{
View: curView,
Proposal: request.Proposal,
})
if err != nil {
logger.Error("Failed to encode", "view", curView)
return
}
c.broadcast(&message{
Hash: request.Proposal.ParentHash(),
Code: msgPreprepare,
Msg: preprepare,
})
}
}
func (c *core) handlePreprepare(msg *message, src istanbul.Validator) error {
logger := c.logger.NewWith("from", src, "state", c.state)
// Decode PRE-PREPARE
var preprepare *istanbul.Preprepare
err := msg.Decode(&preprepare)
if err != nil {
return errFailedDecodePreprepare
}
// Ensure we have the same view with the PRE-PREPARE message
// If it is old message, see if we need to broadcast COMMIT
if err := c.checkMessage(msgPreprepare, preprepare.View); err != nil {
if err == errOldMessage {
// Get validator set for the given proposal
valSet := c.backend.ParentValidators(preprepare.Proposal).Copy()
previousProposer := c.backend.GetProposer(preprepare.Proposal.Number().Uint64() - 1)
valSet.CalcProposer(previousProposer, preprepare.View.Round.Uint64())
// Broadcast COMMIT if it is an existing block
// 1. The proposer needs to be a proposer matches the given (Sequence + Round)
// 2. The given block must exist
if valSet.IsProposer(src.Address()) && c.backend.HasPropsal(preprepare.Proposal.Hash(), preprepare.Proposal.Number()) {
c.sendCommitForOldBlock(preprepare.View, preprepare.Proposal.Hash(), preprepare.Proposal.ParentHash())
return nil
}
}
return err
}
// Check if the message comes from current proposer
if !c.valSet.IsProposer(src.Address()) {
logger.Warn("Ignore preprepare messages from non-proposer")
return errNotFromProposer
}
// Verify the proposal we received
if duration, err := c.backend.Verify(preprepare.Proposal); err != nil {
logger.Warn("Failed to verify proposal", "err", err, "duration", duration)
// if it's a future block, we will handle it again after the duration
if err == consensus.ErrFutureBlock {
c.stopFuturePreprepareTimer()
c.futurePreprepareTimer = time.AfterFunc(duration, func() {
c.sendEvent(backlogEvent{
src: src.Address(),
msg: msg,
Hash: msg.Hash,
})
})
} else {
c.sendNextRoundChange("handlePreprepare. Proposal verification failure. Not ErrFutureBlock")
}
return err
}
// Here is about to accept the PRE-PREPARE
if c.state == StateAcceptRequest {
// Send ROUND CHANGE if the locked proposal and the received proposal are different
if c.current.IsHashLocked() {
header := types.SetRoundToHeader(c.current.Preprepare.Proposal.Header(), c.currentView().Round.Int64())
c.current.Preprepare.Proposal = c.current.Preprepare.Proposal.WithSeal(header)
if preprepare.Proposal.Hash() == c.current.GetLockedHash() {
// Broadcast COMMIT and enters Prepared state directly
c.acceptPreprepare(preprepare)
c.setState(StatePrepared)
c.sendCommit()
} else {
// Send round change
c.sendNextRoundChange("handlePrepare. HashLocked, but received hash is different from locked hash")
}
} else {
// Either
// 1. the locked proposal and the received proposal match
// 2. we have no locked proposal
c.acceptPreprepare(preprepare)
c.setState(StatePreprepared)
c.sendPrepare()
}
}
return nil
}
func (c *core) acceptPreprepare(preprepare *istanbul.Preprepare) {
c.consensusTimestamp = time.Now()
c.current.SetPreprepare(preprepare)
}