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shardForkDetector.go
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shardForkDetector.go
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package sync
import (
"bytes"
"math"
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go-core/data"
"github.com/ElrondNetwork/elrond-go/consensus"
"github.com/ElrondNetwork/elrond-go/process"
)
var _ process.ForkDetector = (*shardForkDetector)(nil)
// shardForkDetector implements the shard fork detector mechanism
type shardForkDetector struct {
*baseForkDetector
}
// NewShardForkDetector method creates a new shardForkDetector object
func NewShardForkDetector(
roundHandler consensus.RoundHandler,
blackListHandler process.TimeCacher,
blockTracker process.BlockTracker,
genesisTime int64,
) (*shardForkDetector, error) {
if check.IfNil(roundHandler) {
return nil, process.ErrNilRoundHandler
}
if check.IfNil(blackListHandler) {
return nil, process.ErrNilBlackListCacher
}
if check.IfNil(blockTracker) {
return nil, process.ErrNilBlockTracker
}
genesisHdr, _, err := blockTracker.GetSelfNotarizedHeader(core.MetachainShardId, 0)
if err != nil {
return nil, err
}
bfd := &baseForkDetector{
roundHandler: roundHandler,
blackListHandler: blackListHandler,
genesisTime: genesisTime,
blockTracker: blockTracker,
genesisNonce: genesisHdr.GetNonce(),
genesisRound: genesisHdr.GetRound(),
genesisEpoch: genesisHdr.GetEpoch(),
}
bfd.headers = make(map[uint64][]*headerInfo)
bfd.fork.checkpoint = make([]*checkpointInfo, 0)
checkpoint := &checkpointInfo{
nonce: bfd.genesisNonce,
round: bfd.genesisRound,
}
bfd.setFinalCheckpoint(checkpoint)
bfd.addCheckpoint(checkpoint)
bfd.fork.rollBackNonce = math.MaxUint64
bfd.fork.probableHighestNonce = bfd.genesisNonce
bfd.fork.highestNonceReceived = bfd.genesisNonce
sfd := shardForkDetector{
baseForkDetector: bfd,
}
sfd.blockTracker.RegisterSelfNotarizedFromCrossHeadersHandler(sfd.ReceivedSelfNotarizedFromCrossHeaders)
bfd.forkDetector = &sfd
return &sfd, nil
}
// AddHeader method adds a new header to headers map
func (sfd *shardForkDetector) AddHeader(
header data.HeaderHandler,
headerHash []byte,
state process.BlockHeaderState,
selfNotarizedHeaders []data.HeaderHandler,
selfNotarizedHeadersHashes [][]byte,
) error {
return sfd.addHeader(
header,
headerHash,
state,
selfNotarizedHeaders,
selfNotarizedHeadersHashes,
sfd.doJobOnBHProcessed,
)
}
func (sfd *shardForkDetector) doJobOnBHProcessed(
header data.HeaderHandler,
headerHash []byte,
selfNotarizedHeaders []data.HeaderHandler,
selfNotarizedHeadersHashes [][]byte,
) {
_ = sfd.appendSelfNotarizedHeaders(selfNotarizedHeaders, selfNotarizedHeadersHashes, core.MetachainShardId)
sfd.computeFinalCheckpoint()
sfd.addCheckpoint(&checkpointInfo{nonce: header.GetNonce(), round: header.GetRound(), hash: headerHash})
sfd.removePastOrInvalidRecords()
}
// ReceivedSelfNotarizedFromCrossHeaders is a registered call handler through which fork detector is notified
// when metachain notarized new headers from self shard
func (sfd *shardForkDetector) ReceivedSelfNotarizedFromCrossHeaders(
shardID uint32,
selfNotarizedHeaders []data.HeaderHandler,
selfNotarizedHeadersHashes [][]byte,
) {
// accept only self notarized headers by meta
if shardID != core.MetachainShardId {
return
}
appended := sfd.appendSelfNotarizedHeaders(selfNotarizedHeaders, selfNotarizedHeadersHashes, shardID)
if appended {
sfd.computeFinalCheckpoint()
}
}
func (sfd *shardForkDetector) appendSelfNotarizedHeaders(
selfNotarizedHeaders []data.HeaderHandler,
selfNotarizedHeadersHashes [][]byte,
shardID uint32,
) bool {
selfNotarizedHeaderAdded := false
finalNonce := sfd.finalCheckpoint().nonce
for i := 0; i < len(selfNotarizedHeaders); i++ {
if selfNotarizedHeaders[i].GetNonce() <= finalNonce {
continue
}
appended := sfd.append(&headerInfo{
nonce: selfNotarizedHeaders[i].GetNonce(),
round: selfNotarizedHeaders[i].GetRound(),
hash: selfNotarizedHeadersHashes[i],
state: process.BHNotarized,
})
if appended {
log.Debug("added self notarized header in fork detector",
"notarized by shard", shardID,
"round", selfNotarizedHeaders[i].GetRound(),
"nonce", selfNotarizedHeaders[i].GetNonce(),
"hash", selfNotarizedHeadersHashes[i])
selfNotarizedHeaderAdded = true
}
}
return selfNotarizedHeaderAdded
}
func (sfd *shardForkDetector) computeFinalCheckpoint() {
finalCheckpoint := &checkpointInfo{}
finalCheckpointWasSet := false
sfd.mutHeaders.RLock()
for nonce, headersInfo := range sfd.headers {
if finalCheckpoint.nonce >= nonce {
continue
}
indexBHProcessed, indexBHNotarized := sfd.getProcessedAndNotarizedIndexes(headersInfo)
isProcessedBlockAlreadyNotarized := indexBHProcessed != -1 && indexBHNotarized != -1
if !isProcessedBlockAlreadyNotarized {
continue
}
sameHash := bytes.Equal(headersInfo[indexBHNotarized].hash, headersInfo[indexBHProcessed].hash)
if !sameHash {
continue
}
finalCheckpoint = &checkpointInfo{
nonce: nonce,
round: headersInfo[indexBHNotarized].round,
hash: headersInfo[indexBHNotarized].hash,
}
finalCheckpointWasSet = true
}
sfd.mutHeaders.RUnlock()
if finalCheckpointWasSet {
sfd.setFinalCheckpoint(finalCheckpoint)
}
}
func (sfd *shardForkDetector) getProcessedAndNotarizedIndexes(headersInfo []*headerInfo) (int, int) {
indexBHProcessed := -1
indexBHNotarized := -1
for index, hdrInfo := range headersInfo {
switch hdrInfo.state {
case process.BHProcessed:
indexBHProcessed = index
case process.BHNotarized:
indexBHNotarized = index
}
}
return indexBHProcessed, indexBHNotarized
}