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requestHandler.go
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requestHandler.go
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package requestHandlers
import (
"fmt"
"sync"
"time"
"github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/core/partitioning"
"github.com/ElrondNetwork/elrond-go/dataRetriever"
"github.com/ElrondNetwork/elrond-go/epochStart"
"github.com/ElrondNetwork/elrond-go/process/factory"
)
var _ epochStart.RequestHandler = (*resolverRequestHandler)(nil)
var log = logger.GetOrCreate("dataretriever/requesthandlers")
const minHashesToRequest = 10
const timeToAccumulateTrieHashes = 100 * time.Millisecond
//TODO move the keys definitions that are whitelisted in core and use them in InterceptedData implementations, Identifiers() function
type resolverRequestHandler struct {
epoch uint32
shardID uint32
maxTxsToRequest int
resolversFinder dataRetriever.ResolversFinder
requestedItemsHandler dataRetriever.RequestedItemsHandler
whiteList dataRetriever.WhiteListHandler
sweepTime time.Time
requestInterval time.Duration
mutSweepTime sync.Mutex
trieHashesAccumulator map[string]struct{}
lastTrieRequestTime time.Time
mutexTrieHashes sync.Mutex
}
// NewResolverRequestHandler creates a requestHandler interface implementation with request functions
func NewResolverRequestHandler(
finder dataRetriever.ResolversFinder,
requestedItemsHandler dataRetriever.RequestedItemsHandler,
whiteList dataRetriever.WhiteListHandler,
maxTxsToRequest int,
shardID uint32,
requestInterval time.Duration,
) (*resolverRequestHandler, error) {
if check.IfNil(finder) {
return nil, dataRetriever.ErrNilResolverFinder
}
if check.IfNil(requestedItemsHandler) {
return nil, dataRetriever.ErrNilRequestedItemsHandler
}
if maxTxsToRequest < 1 {
return nil, dataRetriever.ErrInvalidMaxTxRequest
}
if check.IfNil(whiteList) {
return nil, dataRetriever.ErrNilWhiteListHandler
}
if requestInterval < time.Millisecond {
return nil, fmt.Errorf("%w:request interval is smaller than a millisecond", dataRetriever.ErrRequestIntervalTooSmall)
}
rrh := &resolverRequestHandler{
resolversFinder: finder,
requestedItemsHandler: requestedItemsHandler,
epoch: uint32(0), // will be updated after creation of the request handler
shardID: shardID,
maxTxsToRequest: maxTxsToRequest,
whiteList: whiteList,
requestInterval: requestInterval,
trieHashesAccumulator: make(map[string]struct{}),
}
rrh.sweepTime = time.Now()
return rrh, nil
}
// SetEpoch will update the current epoch so the request handler will make requests for this received epoch
func (rrh *resolverRequestHandler) SetEpoch(epoch uint32) {
rrh.epoch = epoch
}
// RequestTransaction method asks for transactions from the connected peers
func (rrh *resolverRequestHandler) RequestTransaction(destShardID uint32, txHashes [][]byte) {
rrh.requestByHashes(destShardID, txHashes, factory.TransactionTopic)
}
func (rrh *resolverRequestHandler) requestByHashes(destShardID uint32, hashes [][]byte, topic string) {
unrequestedHashes := rrh.getUnrequestedHashes(hashes)
if len(unrequestedHashes) == 0 {
return
}
log.Debug("requesting transactions from network",
"topic", topic,
"shard", destShardID,
"num txs", len(unrequestedHashes),
)
resolver, err := rrh.resolversFinder.CrossShardResolver(topic, destShardID)
if err != nil {
log.Error("requestByHashes.CrossShardResolver",
"error", err.Error(),
"topic", topic,
"shard", destShardID,
)
return
}
txResolver, ok := resolver.(HashSliceResolver)
if !ok {
log.Warn("wrong assertion type when creating transaction resolver")
return
}
for _, txHash := range hashes {
log.Trace("requestByHashes", "hash", txHash)
}
rrh.whiteList.Add(unrequestedHashes)
go rrh.requestHashesWithDataSplit(unrequestedHashes, txResolver)
rrh.addRequestedItems(unrequestedHashes)
}
func (rrh *resolverRequestHandler) requestHashesWithDataSplit(
unrequestedHashes [][]byte,
resolver HashSliceResolver,
) {
dataSplit := &partitioning.DataSplit{}
sliceBatches, err := dataSplit.SplitDataInChunks(unrequestedHashes, rrh.maxTxsToRequest)
if err != nil {
log.Debug("requestByHashes.SplitDataInChunks",
"error", err.Error(),
"num txs", len(unrequestedHashes),
"max txs to request", rrh.maxTxsToRequest,
)
}
for _, batch := range sliceBatches {
err = resolver.RequestDataFromHashArray(batch, rrh.epoch)
if err != nil {
log.Debug("requestByHashes.RequestDataFromHashArray",
"error", err.Error(),
"epoch", rrh.epoch,
"batch size", len(batch),
)
}
}
}
// RequestUnsignedTransactions method asks for unsigned transactions from the connected peers
func (rrh *resolverRequestHandler) RequestUnsignedTransactions(destShardID uint32, scrHashes [][]byte) {
rrh.requestByHashes(destShardID, scrHashes, factory.UnsignedTransactionTopic)
}
// RequestRewardTransactions requests for reward transactions from the connected peers
func (rrh *resolverRequestHandler) RequestRewardTransactions(destShardID uint32, rewardTxHashes [][]byte) {
rrh.requestByHashes(destShardID, rewardTxHashes, factory.RewardsTransactionTopic)
}
// RequestMiniBlock method asks for miniblock from the connected peers
func (rrh *resolverRequestHandler) RequestMiniBlock(destShardID uint32, miniblockHash []byte) {
if !rrh.testIfRequestIsNeeded(miniblockHash) {
return
}
log.Debug("requesting miniblock from network",
"topic", factory.MiniBlocksTopic,
"shard", destShardID,
"hash", miniblockHash,
)
resolver, err := rrh.resolversFinder.CrossShardResolver(factory.MiniBlocksTopic, destShardID)
if err != nil {
log.Error("RequestMiniBlock.CrossShardResolver",
"error", err.Error(),
"topic", factory.MiniBlocksTopic,
"shard", destShardID,
)
return
}
rrh.whiteList.Add([][]byte{miniblockHash})
err = resolver.RequestDataFromHash(miniblockHash, rrh.epoch)
if err != nil {
log.Debug("RequestMiniBlock.RequestDataFromHash",
"error", err.Error(),
"epoch", rrh.epoch,
"hash", miniblockHash,
)
return
}
rrh.addRequestedItems([][]byte{miniblockHash})
}
// RequestMiniBlocks method asks for miniblocks from the connected peers
func (rrh *resolverRequestHandler) RequestMiniBlocks(destShardID uint32, miniblocksHashes [][]byte) {
unrequestedHashes := rrh.getUnrequestedHashes(miniblocksHashes)
if len(unrequestedHashes) == 0 {
return
}
log.Debug("requesting miniblocks from network",
"topic", factory.MiniBlocksTopic,
"shard", destShardID,
"num mbs", len(unrequestedHashes),
)
resolver, err := rrh.resolversFinder.CrossShardResolver(factory.MiniBlocksTopic, destShardID)
if err != nil {
log.Error("RequestMiniBlocks.CrossShardResolver",
"error", err.Error(),
"topic", factory.MiniBlocksTopic,
"shard", destShardID,
)
return
}
miniBlocksResolver, ok := resolver.(dataRetriever.MiniBlocksResolver)
if !ok {
log.Warn("wrong assertion type when creating miniblocks resolver")
return
}
rrh.whiteList.Add(unrequestedHashes)
err = miniBlocksResolver.RequestDataFromHashArray(unrequestedHashes, rrh.epoch)
if err != nil {
log.Debug("RequestMiniBlocks.RequestDataFromHashArray",
"error", err.Error(),
"epoch", rrh.epoch,
"num mbs", len(unrequestedHashes),
)
return
}
rrh.addRequestedItems(unrequestedHashes)
}
// RequestShardHeader method asks for shard header from the connected peers
func (rrh *resolverRequestHandler) RequestShardHeader(shardID uint32, hash []byte) {
if !rrh.testIfRequestIsNeeded(hash) {
return
}
log.Debug("requesting shard header from network",
"shard", shardID,
"hash", hash,
)
headerResolver, err := rrh.getShardHeaderResolver(shardID)
if err != nil {
log.Error("RequestShardHeader.getShardHeaderResolver",
"error", err.Error(),
"shard", shardID,
)
return
}
rrh.whiteList.Add([][]byte{hash})
err = headerResolver.RequestDataFromHash(hash, rrh.epoch)
if err != nil {
log.Debug("RequestShardHeader.RequestDataFromHash",
"error", err.Error(),
"epoch", rrh.epoch,
"hash", hash,
)
return
}
rrh.addRequestedItems([][]byte{hash})
}
// RequestMetaHeader method asks for meta header from the connected peers
func (rrh *resolverRequestHandler) RequestMetaHeader(hash []byte) {
if !rrh.testIfRequestIsNeeded(hash) {
return
}
log.Debug("requesting meta header from network",
"hash", hash,
)
resolver, err := rrh.getMetaHeaderResolver()
if err != nil {
log.Error("RequestMetaHeader.getMetaHeaderResolver",
"error", err.Error(),
"hash", hash,
)
return
}
rrh.whiteList.Add([][]byte{hash})
err = resolver.RequestDataFromHash(hash, rrh.epoch)
if err != nil {
log.Debug("RequestMetaHeader.RequestDataFromHash",
"error", err.Error(),
"epoch", rrh.epoch,
"hash", hash,
)
return
}
rrh.addRequestedItems([][]byte{hash})
}
// RequestShardHeaderByNonce method asks for shard header from the connected peers by nonce
func (rrh *resolverRequestHandler) RequestShardHeaderByNonce(shardID uint32, nonce uint64) {
key := []byte(fmt.Sprintf("%d-%d", shardID, nonce))
if !rrh.testIfRequestIsNeeded(key) {
return
}
log.Debug("requesting shard header by nonce from network",
"shard", shardID,
"nonce", nonce,
)
headerResolver, err := rrh.getShardHeaderResolver(shardID)
if err != nil {
log.Error("RequestShardHeaderByNonce.getShardHeaderResolver",
"error", err.Error(),
"shard", shardID,
)
return
}
rrh.whiteList.Add([][]byte{key})
err = headerResolver.RequestDataFromNonce(nonce, rrh.epoch)
if err != nil {
log.Debug("RequestShardHeaderByNonce.RequestDataFromNonce",
"error", err.Error(),
"epoch", rrh.epoch,
"nonce", nonce,
)
return
}
rrh.addRequestedItems([][]byte{key})
}
// RequestTrieNodes method asks for trie nodes from the connected peers
func (rrh *resolverRequestHandler) RequestTrieNodes(destShardID uint32, hashes [][]byte, topic string) {
unrequestedHashes := rrh.getUnrequestedHashes(hashes)
if len(unrequestedHashes) == 0 {
return
}
rrh.mutexTrieHashes.Lock()
defer rrh.mutexTrieHashes.Unlock()
for _, hash := range unrequestedHashes {
rrh.trieHashesAccumulator[string(hash)] = struct{}{}
}
index := 0
itemsToRequest := make([][]byte, len(rrh.trieHashesAccumulator))
for hash := range rrh.trieHashesAccumulator {
itemsToRequest[index] = []byte(hash)
index++
}
rrh.whiteList.Add(itemsToRequest)
elapsedTime := time.Since(rrh.lastTrieRequestTime)
if len(rrh.trieHashesAccumulator) < minHashesToRequest && elapsedTime < timeToAccumulateTrieHashes {
return
}
log.Debug("requesting trie nodes from network",
"topic", topic,
"shard", destShardID,
"num nodes", len(rrh.trieHashesAccumulator),
"firstHash", unrequestedHashes[0],
)
resolver, err := rrh.resolversFinder.MetaCrossShardResolver(topic, destShardID)
if err != nil {
log.Error("requestByHash.Resolver",
"error", err.Error(),
"topic", topic,
"shard", destShardID,
)
return
}
trieResolver, ok := resolver.(dataRetriever.TrieNodesResolver)
if !ok {
log.Warn("wrong assertion type when creating a trie nodes resolver")
return
}
for _, txHash := range rrh.trieHashesAccumulator {
log.Trace("requestByHashes", "hash", txHash)
}
go rrh.requestHashesWithDataSplit(itemsToRequest, trieResolver)
rrh.addRequestedItems(itemsToRequest)
rrh.lastTrieRequestTime = time.Now()
rrh.trieHashesAccumulator = make(map[string]struct{})
}
// RequestMetaHeaderByNonce method asks for meta header from the connected peers by nonce
func (rrh *resolverRequestHandler) RequestMetaHeaderByNonce(nonce uint64) {
key := []byte(fmt.Sprintf("%d-%d", core.MetachainShardId, nonce))
if !rrh.testIfRequestIsNeeded(key) {
return
}
log.Debug("requesting meta header by nonce from network",
"nonce", nonce,
)
headerResolver, err := rrh.getMetaHeaderResolver()
if err != nil {
log.Error("RequestMetaHeaderByNonce.getMetaHeaderResolver",
"error", err.Error(),
)
return
}
rrh.whiteList.Add([][]byte{key})
err = headerResolver.RequestDataFromNonce(nonce, rrh.epoch)
if err != nil {
log.Debug("RequestMetaHeaderByNonce.RequestDataFromNonce",
"error", err.Error(),
"epoch", rrh.epoch,
"nonce", nonce,
)
return
}
rrh.addRequestedItems([][]byte{key})
}
func (rrh *resolverRequestHandler) testIfRequestIsNeeded(key []byte) bool {
rrh.sweepIfNeeded()
if rrh.requestedItemsHandler.Has(string(key)) {
log.Trace("item already requested",
"key", key)
return false
}
return true
}
func (rrh *resolverRequestHandler) addRequestedItems(keys [][]byte) {
for _, key := range keys {
err := rrh.requestedItemsHandler.Add(string(key))
if err != nil {
log.Trace("addRequestedItems",
"error", err.Error(),
"key", key)
continue
}
}
}
func (rrh *resolverRequestHandler) getShardHeaderResolver(shardID uint32) (dataRetriever.HeaderResolver, error) {
isMetachainNode := rrh.shardID == core.MetachainShardId
shardIdMissmatch := rrh.shardID != shardID
requestOnMetachain := shardID == core.MetachainShardId
isRequestInvalid := (!isMetachainNode && shardIdMissmatch) || requestOnMetachain
if isRequestInvalid {
return nil, dataRetriever.ErrBadRequest
}
//requests should be done on the topic shardBlocks_0_META so that is why we need to figure out
//the cross shard id
crossShardID := core.MetachainShardId
if isMetachainNode {
crossShardID = shardID
}
resolver, err := rrh.resolversFinder.CrossShardResolver(factory.ShardBlocksTopic, crossShardID)
if err != nil {
err = fmt.Errorf("%w, topic: %s, current shard ID: %d, cross shard ID: %d",
err, factory.ShardBlocksTopic, rrh.shardID, crossShardID)
log.Warn("available resolvers in container",
"resolvers", rrh.resolversFinder.ResolverKeys(),
)
return nil, err
}
headerResolver, ok := resolver.(dataRetriever.HeaderResolver)
if !ok {
err = fmt.Errorf("%w, topic: %s, current shard ID: %d, cross shard ID: %d, expected HeaderResolver",
dataRetriever.ErrWrongTypeInContainer, factory.ShardBlocksTopic, rrh.shardID, crossShardID)
return nil, err
}
return headerResolver, nil
}
func (rrh *resolverRequestHandler) getMetaHeaderResolver() (dataRetriever.HeaderResolver, error) {
resolver, err := rrh.resolversFinder.MetaChainResolver(factory.MetachainBlocksTopic)
if err != nil {
err = fmt.Errorf("%w, topic: %s, current shard ID: %d",
err, factory.MetachainBlocksTopic, rrh.shardID)
return nil, err
}
headerResolver, ok := resolver.(dataRetriever.HeaderResolver)
if !ok {
err = fmt.Errorf("%w, topic: %s, current shard ID: %d, expected HeaderResolver",
dataRetriever.ErrWrongTypeInContainer, factory.ShardBlocksTopic, rrh.shardID)
return nil, err
}
return headerResolver, nil
}
// RequestStartOfEpochMetaBlock method asks for the start of epoch metablock from the connected peers
func (rrh *resolverRequestHandler) RequestStartOfEpochMetaBlock(epoch uint32) {
epochStartIdentifier := []byte(core.EpochStartIdentifier(epoch))
if !rrh.testIfRequestIsNeeded(epochStartIdentifier) {
return
}
baseTopic := factory.MetachainBlocksTopic
log.Debug("requesting header by epoch",
"topic", baseTopic,
"epoch", epoch,
"hash", epochStartIdentifier,
)
resolver, err := rrh.resolversFinder.MetaChainResolver(baseTopic)
if err != nil {
log.Error("RequestStartOfEpochMetaBlock.MetaChainResolver",
"error", err.Error(),
"topic", baseTopic,
)
return
}
headerResolver, ok := resolver.(dataRetriever.HeaderResolver)
if !ok {
log.Warn("wrong assertion type when creating header resolver")
return
}
rrh.whiteList.Add([][]byte{epochStartIdentifier})
err = headerResolver.RequestDataFromEpoch(epochStartIdentifier)
if err != nil {
log.Debug("RequestStartOfEpochMetaBlock.RequestDataFromEpoch",
"error", err.Error(),
"epochStartIdentifier", epochStartIdentifier,
)
return
}
rrh.addRequestedItems([][]byte{epochStartIdentifier})
}
// RequestInterval returns the request interval between sending the same request
func (rrh *resolverRequestHandler) RequestInterval() time.Duration {
return rrh.requestInterval
}
// IsInterfaceNil returns true if there is no value under the interface
func (rrh *resolverRequestHandler) IsInterfaceNil() bool {
return rrh == nil
}
func (rrh *resolverRequestHandler) getUnrequestedHashes(hashes [][]byte) [][]byte {
unrequestedHashes := make([][]byte, 0)
rrh.sweepIfNeeded()
for _, hash := range hashes {
if !rrh.requestedItemsHandler.Has(string(hash)) {
unrequestedHashes = append(unrequestedHashes, hash)
}
}
return unrequestedHashes
}
func (rrh *resolverRequestHandler) sweepIfNeeded() {
rrh.mutSweepTime.Lock()
defer rrh.mutSweepTime.Unlock()
if time.Since(rrh.sweepTime) <= rrh.requestInterval {
return
}
rrh.sweepTime = time.Now()
rrh.requestedItemsHandler.Sweep()
}
// SetNumPeersToQuery will set the number of intra shard and cross shard number of peers to query
// for a given resolver
func (rrh *resolverRequestHandler) SetNumPeersToQuery(key string, intra int, cross int) error {
resolver, err := rrh.resolversFinder.Get(key)
if err != nil {
return err
}
resolver.SetNumPeersToQuery(intra, cross)
return nil
}
// GetNumPeersToQuery will return the number of intra shard and cross shard number of peers to query
// for a given resolver
func (rrh *resolverRequestHandler) GetNumPeersToQuery(key string) (int, int, error) {
resolver, err := rrh.resolversFinder.Get(key)
if err != nil {
return 0, 0, err
}
intra, cross := resolver.NumPeersToQuery()
return intra, cross, nil
}