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blockProcessor.go
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blockProcessor.go
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package track
import (
"sort"
"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/process"
"github.com/ElrondNetwork/elrond-go/sharding"
)
type blockProcessor struct {
headerValidator process.HeaderConstructionValidator
requestHandler process.RequestHandler
shardCoordinator sharding.Coordinator
blockTracker blockTrackerHandler
crossNotarizer blockNotarizerHandler
selfNotarizer blockNotarizerHandler
crossNotarizedHeadersNotifier blockNotifierHandler
selfNotarizedFromCrossHeadersNotifier blockNotifierHandler
selfNotarizedHeadersNotifier blockNotifierHandler
finalMetachainHeadersNotifier blockNotifierHandler
roundHandler process.RoundHandler
blockFinality uint64
}
// NewBlockProcessor creates a block processor object which implements blockProcessorHandler interface
func NewBlockProcessor(arguments ArgBlockProcessor) (*blockProcessor, error) {
err := checkBlockProcessorNilParameters(arguments)
if err != nil {
return nil, err
}
bp := blockProcessor{
headerValidator: arguments.HeaderValidator,
requestHandler: arguments.RequestHandler,
shardCoordinator: arguments.ShardCoordinator,
blockTracker: arguments.BlockTracker,
crossNotarizer: arguments.CrossNotarizer,
selfNotarizer: arguments.SelfNotarizer,
crossNotarizedHeadersNotifier: arguments.CrossNotarizedHeadersNotifier,
selfNotarizedFromCrossHeadersNotifier: arguments.SelfNotarizedFromCrossHeadersNotifier,
selfNotarizedHeadersNotifier: arguments.SelfNotarizedHeadersNotifier,
finalMetachainHeadersNotifier: arguments.FinalMetachainHeadersNotifier,
roundHandler: arguments.RoundHandler,
}
bp.blockFinality = process.BlockFinality
return &bp, nil
}
// ProcessReceivedHeader processes the header which has been received
func (bp *blockProcessor) ProcessReceivedHeader(header data.HeaderHandler) {
if check.IfNil(header) {
return
}
if !bp.shouldProcessReceivedHeader(header) {
return
}
if header.GetShardID() == core.MetachainShardId {
bp.doJobOnReceivedMetachainHeader()
}
isHeaderForSelfShard := header.GetShardID() == bp.shardCoordinator.SelfId()
if isHeaderForSelfShard {
bp.doJobOnReceivedHeader(header.GetShardID())
} else {
bp.doJobOnReceivedCrossNotarizedHeader(header.GetShardID())
}
}
func (bp *blockProcessor) shouldProcessReceivedHeader(headerHandler data.HeaderHandler) bool {
var lastNotarizedHeader data.HeaderHandler
var err error
isHeaderForSelfShard := headerHandler.GetShardID() == bp.shardCoordinator.SelfId()
if isHeaderForSelfShard {
lastNotarizedHeader, _, err = bp.selfNotarizer.GetLastNotarizedHeader(core.MetachainShardId)
if err != nil {
log.Warn("shouldProcessReceivedHeader: selfNotarizer.GetLastNotarizedHeader",
"shard", core.MetachainShardId, "error", err.Error())
return false
}
} else {
lastNotarizedHeader, _, err = bp.crossNotarizer.GetLastNotarizedHeader(headerHandler.GetShardID())
if err != nil {
log.Warn("shouldProcessReceivedHeader: crossNotarizer.GetLastNotarizedHeader",
"shard", headerHandler.GetShardID(), "error", err.Error())
return false
}
}
shouldProcessReceivedHeader := headerHandler.GetNonce() > lastNotarizedHeader.GetNonce()
return shouldProcessReceivedHeader
}
func (bp *blockProcessor) doJobOnReceivedHeader(shardID uint32) {
if bp.selfNotarizedHeadersNotifier.GetNumRegisteredHandlers() == 0 {
return
}
_, _, selfNotarizedHeaders, selfNotarizedHeadersHashes := bp.blockTracker.ComputeLongestSelfChain()
if len(selfNotarizedHeaders) > 0 {
bp.selfNotarizedHeadersNotifier.CallHandlers(shardID, selfNotarizedHeaders, selfNotarizedHeadersHashes)
}
}
func (bp *blockProcessor) doJobOnReceivedCrossNotarizedHeader(shardID uint32) {
_, _, crossNotarizedHeaders, crossNotarizedHeadersHashes := bp.computeLongestChainFromLastCrossNotarized(shardID)
bp.blockTracker.ComputeCrossInfo(crossNotarizedHeaders)
if len(crossNotarizedHeaders) > 0 {
bp.crossNotarizedHeadersNotifier.CallHandlers(shardID, crossNotarizedHeaders, crossNotarizedHeadersHashes)
}
if bp.selfNotarizedFromCrossHeadersNotifier.GetNumRegisteredHandlers() == 0 {
return
}
selfNotarizedHeaders, selfNotarizedHeadersHashes := bp.computeSelfNotarizedHeaders(crossNotarizedHeaders)
if len(selfNotarizedHeaders) > 0 {
bp.selfNotarizedFromCrossHeadersNotifier.CallHandlers(shardID, selfNotarizedHeaders, selfNotarizedHeadersHashes)
}
}
func (bp *blockProcessor) doJobOnReceivedMetachainHeader() {
if bp.finalMetachainHeadersNotifier.GetNumRegisteredHandlers() == 0 {
return
}
var header data.HeaderHandler
var headerHash []byte
var err error
if bp.shardCoordinator.SelfId() == core.MetachainShardId {
header, headerHash, err = bp.selfNotarizer.GetLastNotarizedHeader(bp.shardCoordinator.SelfId())
if err != nil {
log.Warn("blockProcessor.doJobOnReceivedMetachainHeader", "error", err.Error())
return
}
} else {
header, headerHash, err = bp.crossNotarizer.GetLastNotarizedHeader(core.MetachainShardId)
if err != nil {
log.Warn("blockProcessor.doJobOnReceivedMetachainHeader", "error", err.Error())
return
}
}
sortedHeaders, _ := bp.blockTracker.SortHeadersFromNonce(core.MetachainShardId, header.GetNonce()+1)
if len(sortedHeaders) == 0 {
return
}
finalMetachainHeaders := make([]data.HeaderHandler, 0)
finalMetachainHeadersHashes := make([][]byte, 0)
err = bp.checkHeaderFinality(header, sortedHeaders, 0)
if err == nil {
finalMetachainHeaders = append(finalMetachainHeaders, header)
finalMetachainHeadersHashes = append(finalMetachainHeadersHashes, headerHash)
}
headers, headerHashes := bp.ComputeLongestChain(core.MetachainShardId, header)
finalMetachainHeaders = append(finalMetachainHeaders, headers...)
finalMetachainHeadersHashes = append(finalMetachainHeadersHashes, headerHashes...)
if len(finalMetachainHeaders) > 0 {
bp.finalMetachainHeadersNotifier.CallHandlers(core.MetachainShardId, finalMetachainHeaders, finalMetachainHeadersHashes)
}
}
func (bp *blockProcessor) computeLongestChainFromLastCrossNotarized(
shardID uint32,
) (data.HeaderHandler, []byte, []data.HeaderHandler, [][]byte) {
lastCrossNotarizedHeader, lastCrossNotarizedHeaderHash, err := bp.crossNotarizer.GetLastNotarizedHeader(shardID)
if err != nil {
return nil, nil, nil, nil
}
headers, hashes := bp.ComputeLongestChain(shardID, lastCrossNotarizedHeader)
return lastCrossNotarizedHeader, lastCrossNotarizedHeaderHash, headers, hashes
}
func (bp *blockProcessor) computeSelfNotarizedHeaders(headers []data.HeaderHandler) ([]data.HeaderHandler, [][]byte) {
selfNotarizedHeadersInfo := make([]*HeaderInfo, 0)
for _, header := range headers {
selfHeadersInfo := bp.blockTracker.GetSelfHeaders(header)
if len(selfHeadersInfo) > 0 {
selfNotarizedHeadersInfo = append(selfNotarizedHeadersInfo, selfHeadersInfo...)
}
}
if len(selfNotarizedHeadersInfo) > 1 {
sort.Slice(selfNotarizedHeadersInfo, func(i, j int) bool {
return selfNotarizedHeadersInfo[i].Header.GetNonce() < selfNotarizedHeadersInfo[j].Header.GetNonce()
})
}
selfNotarizedHeaders := make([]data.HeaderHandler, 0)
selfNotarizedHeadersHashes := make([][]byte, 0)
for _, selfNotarizedHeaderInfo := range selfNotarizedHeadersInfo {
selfNotarizedHeaders = append(selfNotarizedHeaders, selfNotarizedHeaderInfo.Header)
selfNotarizedHeadersHashes = append(selfNotarizedHeadersHashes, selfNotarizedHeaderInfo.Hash)
}
return selfNotarizedHeaders, selfNotarizedHeadersHashes
}
// ComputeLongestChain computes the longest chain for a given shard starting from a given header
func (bp *blockProcessor) ComputeLongestChain(shardID uint32, header data.HeaderHandler) ([]data.HeaderHandler, [][]byte) {
headers := make([]data.HeaderHandler, 0)
headersHashes := make([][]byte, 0)
if check.IfNil(header) {
return headers, headersHashes
}
var sortedHeaders []data.HeaderHandler
var sortedHeadersHashes [][]byte
defer func() {
go bp.requestHeadersIfNeeded(header, sortedHeaders, headers)
}()
sortedHeaders, sortedHeadersHashes = bp.blockTracker.SortHeadersFromNonce(shardID, header.GetNonce()+1)
if len(sortedHeaders) == 0 {
return headers, headersHashes
}
longestChainHeadersIndexes := make([]int, 0)
headersIndexes := make([]int, 0)
bp.getNextHeader(&longestChainHeadersIndexes, headersIndexes, header, sortedHeaders, 0)
for _, index := range longestChainHeadersIndexes {
headers = append(headers, sortedHeaders[index])
headersHashes = append(headersHashes, sortedHeadersHashes[index])
}
return headers, headersHashes
}
func (bp *blockProcessor) getNextHeader(
longestChainHeadersIndexes *[]int,
headersIndexes []int,
prevHeader data.HeaderHandler,
sortedHeaders []data.HeaderHandler,
index int,
) {
defer func() {
if len(headersIndexes) > len(*longestChainHeadersIndexes) {
*longestChainHeadersIndexes = headersIndexes
}
}()
if check.IfNil(prevHeader) {
return
}
for i := index; i < len(sortedHeaders); i++ {
currHeader := sortedHeaders[i]
if currHeader.GetNonce() > prevHeader.GetNonce()+1 {
break
}
err := bp.headerValidator.IsHeaderConstructionValid(currHeader, prevHeader)
if err != nil {
continue
}
err = bp.checkHeaderFinality(currHeader, sortedHeaders, i+1)
if err != nil {
continue
}
headersIndexes = append(headersIndexes, i)
bp.getNextHeader(longestChainHeadersIndexes, headersIndexes, currHeader, sortedHeaders, i+1)
headersIndexes = headersIndexes[:len(headersIndexes)-1]
}
}
func (bp *blockProcessor) checkHeaderFinality(
header data.HeaderHandler,
sortedHeaders []data.HeaderHandler,
index int,
) error {
if check.IfNil(header) {
return process.ErrNilBlockHeader
}
prevHeader := header
numFinalityAttestingHeaders := uint64(0)
for i := index; i < len(sortedHeaders); i++ {
currHeader := sortedHeaders[i]
if numFinalityAttestingHeaders >= bp.blockFinality || currHeader.GetNonce() > prevHeader.GetNonce()+1 {
break
}
err := bp.headerValidator.IsHeaderConstructionValid(currHeader, prevHeader)
if err != nil {
continue
}
prevHeader = currHeader
numFinalityAttestingHeaders += 1
}
if numFinalityAttestingHeaders < bp.blockFinality {
return process.ErrHeaderNotFinal
}
return nil
}
func (bp *blockProcessor) requestHeadersIfNeeded(
lastNotarizedHeader data.HeaderHandler,
sortedReceivedHeaders []data.HeaderHandler,
longestChainHeaders []data.HeaderHandler,
) {
if check.IfNil(lastNotarizedHeader) {
return
}
shouldRequestHeaders := false
defer func() {
if !shouldRequestHeaders {
latestValidHeader := bp.getLatestValidHeader(lastNotarizedHeader, longestChainHeaders)
highestRound := bp.getHighestRoundInReceivedHeaders(latestValidHeader, sortedReceivedHeaders)
bp.requestHeadersIfNothingNewIsReceived(lastNotarizedHeader.GetNonce(), latestValidHeader, highestRound)
}
}()
numSortedReceivedHeaders := len(sortedReceivedHeaders)
if numSortedReceivedHeaders == 0 {
return
}
highestNonceReceived := sortedReceivedHeaders[numSortedReceivedHeaders-1].GetNonce()
highestNonceInLongestChain := lastNotarizedHeader.GetNonce()
numLongestChainHeaders := len(longestChainHeaders)
if numLongestChainHeaders > 0 {
highestNonceInLongestChain = longestChainHeaders[numLongestChainHeaders-1].GetNonce()
}
shouldRequestHeaders = highestNonceReceived > highestNonceInLongestChain+bp.blockFinality && numLongestChainHeaders == 0
if !shouldRequestHeaders {
return
}
log.Debug("requestHeadersIfNeeded",
"shard", lastNotarizedHeader.GetShardID(),
"last notarized nonce", lastNotarizedHeader.GetNonce(),
"numSortedReceivedHeaders", numSortedReceivedHeaders,
"numLongestChainHeaders", numLongestChainHeaders,
"highest nonce received", highestNonceReceived,
"highest nonce in longest chain", highestNonceInLongestChain)
bp.requestHeaders(lastNotarizedHeader.GetShardID(), highestNonceInLongestChain+1)
}
func (bp *blockProcessor) getLatestValidHeader(
lastNotarizedHeader data.HeaderHandler,
longestChainHeaders []data.HeaderHandler,
) data.HeaderHandler {
latestValidHeader := lastNotarizedHeader
numLongestChainHeaders := len(longestChainHeaders)
if numLongestChainHeaders > 0 {
latestValidHeader = longestChainHeaders[numLongestChainHeaders-1]
}
return latestValidHeader
}
func (bp *blockProcessor) getHighestRoundInReceivedHeaders(
latestValidHeader data.HeaderHandler,
sortedReceivedHeaders []data.HeaderHandler,
) uint64 {
if check.IfNil(latestValidHeader) {
return 0
}
highestRound := latestValidHeader.GetRound()
numSortedReceivedHeaders := len(sortedReceivedHeaders)
if numSortedReceivedHeaders > 0 {
highestRound = core.MaxUint64(highestRound, sortedReceivedHeaders[numSortedReceivedHeaders-1].GetRound())
}
return highestRound
}
func (bp *blockProcessor) requestHeadersIfNothingNewIsReceived(
lastNotarizedHeaderNonce uint64,
latestValidHeader data.HeaderHandler,
highestRoundInReceivedHeaders uint64,
) {
if check.IfNil(latestValidHeader) {
return
}
shouldRequestHeaders := bp.roundHandler.Index()-int64(highestRoundInReceivedHeaders) > process.MaxRoundsWithoutNewBlockReceived &&
int64(latestValidHeader.GetNonce())-int64(lastNotarizedHeaderNonce) <= process.MaxHeadersToRequestInAdvance
if !shouldRequestHeaders {
return
}
log.Debug("requestHeadersIfNothingNewIsReceived",
"shard", latestValidHeader.GetShardID(),
"latest valid header nonce", latestValidHeader.GetNonce(),
"chronology round", bp.roundHandler.Index(),
"highest round in received headers", highestRoundInReceivedHeaders)
bp.requestHeaders(latestValidHeader.GetShardID(), latestValidHeader.GetNonce()+1)
}
func (bp *blockProcessor) requestHeaders(shardID uint32, fromNonce uint64) {
toNonce := fromNonce + bp.blockFinality
for nonce := fromNonce; nonce <= toNonce; nonce++ {
log.Trace("requestHeaders.RequestHeaderByNonce",
"shard", shardID,
"nonce", nonce)
bp.blockTracker.AddHeaderFromPool(shardID, nonce)
if shardID == core.MetachainShardId {
bp.requestHandler.RequestMetaHeaderByNonce(nonce)
} else {
bp.requestHandler.RequestShardHeaderByNonce(shardID, nonce)
}
}
}
// IsInterfaceNil returns true if there is no value under the interface
func (bp *blockProcessor) IsInterfaceNil() bool {
return bp == nil
}
func checkBlockProcessorNilParameters(arguments ArgBlockProcessor) error {
if check.IfNil(arguments.HeaderValidator) {
return process.ErrNilHeaderValidator
}
if check.IfNil(arguments.RequestHandler) {
return process.ErrNilRequestHandler
}
if check.IfNil(arguments.ShardCoordinator) {
return process.ErrNilShardCoordinator
}
if check.IfNil(arguments.BlockTracker) {
return ErrNilBlockTrackerHandler
}
if check.IfNil(arguments.CrossNotarizer) {
return ErrNilCrossNotarizer
}
if check.IfNil(arguments.SelfNotarizer) {
return ErrNilSelfNotarizer
}
if check.IfNil(arguments.CrossNotarizedHeadersNotifier) {
return ErrNilCrossNotarizedHeadersNotifier
}
if check.IfNil(arguments.SelfNotarizedFromCrossHeadersNotifier) {
return ErrNilSelfNotarizedFromCrossHeadersNotifier
}
if check.IfNil(arguments.SelfNotarizedHeadersNotifier) {
return ErrNilSelfNotarizedHeadersNotifier
}
if check.IfNil(arguments.FinalMetachainHeadersNotifier) {
return ErrNilFinalMetachainHeadersNotifier
}
if check.IfNil(arguments.RoundHandler) {
return ErrNilRoundHandler
}
return nil
}