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requestHandler.go
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requestHandler.go
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package requestHandlers
import (
"fmt"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/logger"
"github.com/ElrondNetwork/elrond-go/core/partitioning"
"github.com/ElrondNetwork/elrond-go/dataRetriever"
"github.com/ElrondNetwork/elrond-go/sharding"
)
type resolverRequestHandler struct {
resolversFinder dataRetriever.ResolversFinder
txRequestTopic string
scrRequestTopic string
rewardTxRequestTopic string
mbRequestTopic string
shardHdrRequestTopic string
metaHdrRequestTopic string
isMetaChain bool
maxTxsToRequest int
}
var log = logger.DefaultLogger()
// NewShardResolverRequestHandler creates a requestHandler interface implementation with request functions
func NewShardResolverRequestHandler(
finder dataRetriever.ResolversFinder,
txRequestTopic string,
scrRequestTopic string,
rewardTxRequestTopic string,
mbRequestTopic string,
shardHdrRequestTopic string,
metaHdrRequestTopic string,
maxTxsToRequest int,
) (*resolverRequestHandler, error) {
if finder == nil || finder.IsInterfaceNil() {
return nil, dataRetriever.ErrNilResolverFinder
}
if len(txRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyTxRequestTopic
}
if len(scrRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyScrRequestTopic
}
if len(rewardTxRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyRewardTxRequestTopic
}
if len(mbRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyMiniBlockRequestTopic
}
if len(shardHdrRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyShardHeaderRequestTopic
}
if len(metaHdrRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyMetaHeaderRequestTopic
}
if maxTxsToRequest < 1 {
return nil, dataRetriever.ErrInvalidMaxTxRequest
}
rrh := &resolverRequestHandler{
resolversFinder: finder,
txRequestTopic: txRequestTopic,
mbRequestTopic: mbRequestTopic,
shardHdrRequestTopic: shardHdrRequestTopic,
metaHdrRequestTopic: metaHdrRequestTopic,
scrRequestTopic: scrRequestTopic,
rewardTxRequestTopic: rewardTxRequestTopic,
isMetaChain: false,
maxTxsToRequest: maxTxsToRequest,
}
return rrh, nil
}
// NewMetaResolverRequestHandler creates a requestHandler interface implementation with request functions
func NewMetaResolverRequestHandler(
finder dataRetriever.ResolversFinder,
shardHdrRequestTopic string,
metaHdrRequestTopic string,
txRequestTopic string,
scrRequestTopic string,
mbRequestTopic string,
) (*resolverRequestHandler, error) {
if finder == nil || finder.IsInterfaceNil() {
return nil, dataRetriever.ErrNilResolverFinder
}
if len(shardHdrRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyShardHeaderRequestTopic
}
if len(metaHdrRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyMetaHeaderRequestTopic
}
if len(txRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyTxRequestTopic
}
if len(scrRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyScrRequestTopic
}
if len(mbRequestTopic) == 0 {
return nil, dataRetriever.ErrEmptyMiniBlockRequestTopic
}
rrh := &resolverRequestHandler{
resolversFinder: finder,
shardHdrRequestTopic: shardHdrRequestTopic,
metaHdrRequestTopic: metaHdrRequestTopic,
txRequestTopic: txRequestTopic,
mbRequestTopic: mbRequestTopic,
scrRequestTopic: scrRequestTopic,
isMetaChain: true,
}
return rrh, nil
}
// RequestTransaction method asks for transactions from the connected peers
func (rrh *resolverRequestHandler) RequestTransaction(destShardID uint32, txHashes [][]byte) {
rrh.requestByHashes(destShardID, txHashes, rrh.txRequestTopic)
}
func (rrh *resolverRequestHandler) requestByHashes(destShardID uint32, hashes [][]byte, topic string) {
log.Debug(fmt.Sprintf("Requesting %d transactions from shard %d from network on topic %s...\n", len(hashes), destShardID, topic))
resolver, err := rrh.resolversFinder.CrossShardResolver(topic, destShardID)
if err != nil {
log.Error(fmt.Sprintf("missing resolver to %s topic to shard %d", topic, destShardID))
return
}
txResolver, ok := resolver.(HashSliceResolver)
if !ok {
log.Error("wrong assertion type when creating transaction resolver")
return
}
go func() {
dataSplit := &partitioning.DataSplit{}
sliceBatches, err := dataSplit.SplitDataInChunks(hashes, rrh.maxTxsToRequest)
if err != nil {
log.Error("error requesting transactions: " + err.Error())
return
}
for _, batch := range sliceBatches {
err = txResolver.RequestDataFromHashArray(batch)
if err != nil {
log.Debug("error requesting tx batch: " + err.Error())
}
}
}()
}
// RequestUnsignedTransactions method asks for unsigned transactions from the connected peers
func (rrh *resolverRequestHandler) RequestUnsignedTransactions(destShardID uint32, scrHashes [][]byte) {
rrh.requestByHashes(destShardID, scrHashes, rrh.scrRequestTopic)
}
// RequestRewardTransactions requests for reward transactions from the connected peers
func (rrh *resolverRequestHandler) RequestRewardTransactions(destShardId uint32, rewardTxHashes [][]byte) {
rrh.requestByHashes(destShardId, rewardTxHashes, rrh.rewardTxRequestTopic)
}
// RequestMiniBlock method asks for miniblocks from the connected peers
func (rrh *resolverRequestHandler) RequestMiniBlock(shardId uint32, miniblockHash []byte) {
rrh.requestByHash(shardId, miniblockHash, rrh.mbRequestTopic)
}
// RequestHeader method asks for header from the connected peers
func (rrh *resolverRequestHandler) RequestHeader(shardId uint32, hash []byte) {
//TODO: Refactor this class and create specific methods for requesting shard or meta data
var topic string
if shardId == sharding.MetachainShardId {
topic = rrh.metaHdrRequestTopic
} else {
topic = rrh.shardHdrRequestTopic
}
rrh.requestByHash(shardId, hash, topic)
}
func (rrh *resolverRequestHandler) requestByHash(destShardID uint32, hash []byte, baseTopic string) {
log.Debug(fmt.Sprintf("Requesting %s from shard %d with hash %s from network\n", baseTopic, destShardID, core.ToB64(hash)))
var resolver dataRetriever.Resolver
var err error
if destShardID == sharding.MetachainShardId {
resolver, err = rrh.resolversFinder.MetaChainResolver(baseTopic)
} else {
resolver, err = rrh.resolversFinder.CrossShardResolver(baseTopic, destShardID)
}
if err != nil {
log.Error(fmt.Sprintf("missing resolver to %s topic to shard %d", baseTopic, destShardID))
return
}
err = resolver.RequestDataFromHash(hash)
if err != nil {
log.Debug(err.Error())
}
}
// RequestHeaderByNonce method asks for transactions from the connected peers
func (rrh *resolverRequestHandler) RequestHeaderByNonce(destShardID uint32, nonce uint64) {
var err error
var resolver dataRetriever.Resolver
var topic string
if rrh.isMetaChain {
topic = rrh.shardHdrRequestTopic
resolver, err = rrh.resolversFinder.CrossShardResolver(topic, destShardID)
} else {
topic = rrh.metaHdrRequestTopic
resolver, err = rrh.resolversFinder.MetaChainResolver(topic)
}
if err != nil {
log.Error(fmt.Sprintf("missing resolver to %s topic to shard %d", topic, destShardID))
return
}
headerResolver, ok := resolver.(dataRetriever.HeaderResolver)
if !ok {
log.Error(fmt.Sprintf("resolver is not a header resolver to %s topic to shard %d", topic, destShardID))
return
}
err = headerResolver.RequestDataFromNonce(nonce)
if err != nil {
log.Debug(err.Error())
}
}
// IsInterfaceNil returns true if there is no value under the interface
func (rrh *resolverRequestHandler) IsInterfaceNil() bool {
if rrh == nil {
return true
}
return false
}