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epochStartMetaBlockProcessor.go
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/
epochStartMetaBlockProcessor.go
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package bootstrap
import (
"context"
"math"
"sync"
"time"
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go-core/data/block"
"github.com/ElrondNetwork/elrond-go-core/hashing"
"github.com/ElrondNetwork/elrond-go-core/marshal"
"github.com/ElrondNetwork/elrond-go/epochStart"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/process/factory"
)
const durationBetweenChecks = 200 * time.Millisecond
const durationBetweenReRequests = 1 * time.Second
const durationBetweenCheckingNumConnectedPeers = 500 * time.Millisecond
const minNumPeersToConsiderMetaBlockValid = 1
const minNumConnectedPeers = 1
var _ process.InterceptorProcessor = (*epochStartMetaBlockProcessor)(nil)
type epochStartMetaBlockProcessor struct {
messenger Messenger
requestHandler RequestHandler
marshalizer marshal.Marshalizer
hasher hashing.Hasher
mutReceivedMetaBlocks sync.RWMutex
mapReceivedMetaBlocks map[string]*block.MetaBlock
mapMetaBlocksFromPeers map[string][]core.PeerID
chanConsensusReached chan bool
metaBlock *block.MetaBlock
peerCountTarget int
minNumConnectedPeers int
minNumOfPeersToConsiderBlockValid int
}
// NewEpochStartMetaBlockProcessor will return an interceptor processor for epoch start meta block
func NewEpochStartMetaBlockProcessor(
messenger Messenger,
handler RequestHandler,
marshalizer marshal.Marshalizer,
hasher hashing.Hasher,
consensusPercentage uint8,
minNumConnectedPeersConfig int,
minNumOfPeersToConsiderBlockValidConfig int,
) (*epochStartMetaBlockProcessor, error) {
if check.IfNil(messenger) {
return nil, epochStart.ErrNilMessenger
}
if check.IfNil(handler) {
return nil, epochStart.ErrNilRequestHandler
}
if check.IfNil(marshalizer) {
return nil, epochStart.ErrNilMarshalizer
}
if check.IfNil(hasher) {
return nil, epochStart.ErrNilHasher
}
if !(consensusPercentage > 0 && consensusPercentage <= 100) {
return nil, epochStart.ErrInvalidConsensusThreshold
}
if minNumConnectedPeersConfig < minNumConnectedPeers {
return nil, epochStart.ErrNotEnoughNumConnectedPeers
}
if minNumOfPeersToConsiderBlockValidConfig < minNumPeersToConsiderMetaBlockValid {
return nil, epochStart.ErrNotEnoughNumOfPeersToConsiderBlockValid
}
processor := &epochStartMetaBlockProcessor{
messenger: messenger,
requestHandler: handler,
marshalizer: marshalizer,
hasher: hasher,
minNumConnectedPeers: minNumConnectedPeersConfig,
minNumOfPeersToConsiderBlockValid: minNumOfPeersToConsiderBlockValidConfig,
mutReceivedMetaBlocks: sync.RWMutex{},
mapReceivedMetaBlocks: make(map[string]*block.MetaBlock),
mapMetaBlocksFromPeers: make(map[string][]core.PeerID),
chanConsensusReached: make(chan bool, 1),
}
processor.waitForEnoughNumConnectedPeers(messenger)
percentage := float64(consensusPercentage) / 100.0
peerCountTarget := int(percentage * float64(len(messenger.ConnectedPeers())))
processor.peerCountTarget = peerCountTarget
log.Debug("consensus percentage for epoch start meta block ", "value (%)", consensusPercentage, "peerCountTarget", peerCountTarget)
return processor, nil
}
// Validate will return nil as there is no need for validation
func (e *epochStartMetaBlockProcessor) Validate(_ process.InterceptedData, _ core.PeerID) error {
return nil
}
func (e *epochStartMetaBlockProcessor) waitForEnoughNumConnectedPeers(messenger Messenger) {
for {
numConnectedPeers := len(messenger.ConnectedPeers())
if numConnectedPeers >= e.minNumConnectedPeers {
break
}
log.Debug("epoch bootstrapper: not enough connected peers",
"wanted", e.minNumConnectedPeers,
"actual", numConnectedPeers)
time.Sleep(durationBetweenCheckingNumConnectedPeers)
}
}
// Save will handle the consensus mechanism for the fetched metablocks
// All errors are just logged because if this function returns an error, the processing is finished. This way, we ignore
// wrong received data and wait for relevant intercepted data
func (e *epochStartMetaBlockProcessor) Save(data process.InterceptedData, fromConnectedPeer core.PeerID, _ string) error {
if check.IfNil(data) {
log.Debug("epoch bootstrapper: nil intercepted data")
return nil
}
log.Debug("received header", "type", data.Type(), "hash", data.Hash())
interceptedHdr, ok := data.(process.HdrValidatorHandler)
if !ok {
log.Warn("saving epoch start meta block error", "error", epochStart.ErrWrongTypeAssertion)
return nil
}
metaBlock, ok := interceptedHdr.HeaderHandler().(*block.MetaBlock)
if !ok {
log.Warn("saving epoch start meta block error", "error", epochStart.ErrWrongTypeAssertion,
"header", interceptedHdr.HeaderHandler())
return nil
}
if !metaBlock.IsStartOfEpochBlock() {
log.Warn("received metablock is not of type epoch start", "error", epochStart.ErrNotEpochStartBlock)
return nil
}
mbHash := interceptedHdr.Hash()
log.Debug("received epoch start meta", "epoch", metaBlock.GetEpoch(), "from peer", fromConnectedPeer.Pretty())
e.mutReceivedMetaBlocks.Lock()
e.mapReceivedMetaBlocks[string(mbHash)] = metaBlock
e.addToPeerList(string(mbHash), fromConnectedPeer)
e.mutReceivedMetaBlocks.Unlock()
return nil
}
// this func should be called under mutex protection
func (e *epochStartMetaBlockProcessor) addToPeerList(hash string, peer core.PeerID) {
peersListForHash := e.mapMetaBlocksFromPeers[hash]
for _, pid := range peersListForHash {
if pid == peer {
return
}
}
e.mapMetaBlocksFromPeers[hash] = append(e.mapMetaBlocksFromPeers[hash], peer)
}
// GetEpochStartMetaBlock will return the metablock after it is confirmed or an error if the number of tries was exceeded
// This is a blocking method which will end after the consensus for the meta block is obtained or the context is done
func (e *epochStartMetaBlockProcessor) GetEpochStartMetaBlock(ctx context.Context) (*block.MetaBlock, error) {
originalIntra, originalCross, err := e.requestHandler.GetNumPeersToQuery(factory.MetachainBlocksTopic)
if err != nil {
return nil, err
}
defer func() {
err = e.requestHandler.SetNumPeersToQuery(factory.MetachainBlocksTopic, originalIntra, originalCross)
if err != nil {
log.Warn("epoch bootstrapper: error setting num of peers intra/cross for resolver",
"resolver", factory.MetachainBlocksTopic,
"error", err)
}
}()
err = e.requestMetaBlock()
if err != nil {
return nil, err
}
chanRequests := time.After(durationBetweenReRequests)
chanCheckMaps := time.After(durationBetweenChecks)
for {
select {
case <-e.chanConsensusReached:
return e.metaBlock, nil
case <-ctx.Done():
return e.getMostReceivedMetaBlock()
case <-chanRequests:
err = e.requestMetaBlock()
if err != nil {
return nil, err
}
chanRequests = time.After(durationBetweenReRequests)
case <-chanCheckMaps:
e.checkMaps()
chanCheckMaps = time.After(durationBetweenChecks)
}
}
}
func (e *epochStartMetaBlockProcessor) getMostReceivedMetaBlock() (*block.MetaBlock, error) {
e.mutReceivedMetaBlocks.RLock()
defer e.mutReceivedMetaBlocks.RUnlock()
var mostReceivedHash string
maxLength := e.minNumOfPeersToConsiderBlockValid - 1
for hash, entry := range e.mapMetaBlocksFromPeers {
if len(entry) > maxLength {
maxLength = len(entry)
mostReceivedHash = hash
}
}
if len(mostReceivedHash) == 0 {
return nil, epochStart.ErrTimeoutWaitingForMetaBlock
}
return e.mapReceivedMetaBlocks[mostReceivedHash], nil
}
func (e *epochStartMetaBlockProcessor) requestMetaBlock() error {
numConnectedPeers := len(e.messenger.ConnectedPeers())
err := e.requestHandler.SetNumPeersToQuery(factory.MetachainBlocksTopic, numConnectedPeers, numConnectedPeers)
if err != nil {
return err
}
unknownEpoch := uint32(math.MaxUint32)
e.requestHandler.RequestStartOfEpochMetaBlock(unknownEpoch)
return nil
}
func (e *epochStartMetaBlockProcessor) checkMaps() {
e.mutReceivedMetaBlocks.RLock()
defer e.mutReceivedMetaBlocks.RUnlock()
for hash, peersList := range e.mapMetaBlocksFromPeers {
log.Debug("metablock from peers", "num peers", len(peersList), "target", e.peerCountTarget, "hash", []byte(hash))
found := e.processEntry(peersList, hash)
if found {
break
}
}
}
func (e *epochStartMetaBlockProcessor) processEntry(
peersList []core.PeerID,
hash string,
) bool {
if len(peersList) >= e.peerCountTarget {
log.Info("got consensus for epoch start metablock", "len", len(peersList))
e.metaBlock = e.mapReceivedMetaBlocks[hash]
e.chanConsensusReached <- true
return true
}
return false
}
// RegisterHandler registers a callback function to be notified of incoming epoch start metablocks
func (e *epochStartMetaBlockProcessor) RegisterHandler(_ func(topic string, hash []byte, data interface{})) {
}
// IsInterfaceNil returns true if there is no value under the interface
func (e *epochStartMetaBlockProcessor) IsInterfaceNil() bool {
return e == nil
}