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headerResolver.go
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/
headerResolver.go
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package resolvers
import (
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go-core/data/typeConverters"
"github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/dataRetriever"
"github.com/ElrondNetwork/elrond-go/dataRetriever/resolvers/epochproviders/disabled"
"github.com/ElrondNetwork/elrond-go/p2p"
"github.com/ElrondNetwork/elrond-go/sharding"
"github.com/ElrondNetwork/elrond-go/storage"
)
var log = logger.GetOrCreate("dataRetriever/resolvers")
var _ dataRetriever.HeaderResolver = (*HeaderResolver)(nil)
// ArgHeaderResolver is the argument structure used to create new HeaderResolver instance
type ArgHeaderResolver struct {
ArgBaseResolver
Headers dataRetriever.HeadersPool
HdrStorage storage.Storer
HeadersNoncesStorage storage.Storer
NonceConverter typeConverters.Uint64ByteSliceConverter
ShardCoordinator sharding.Coordinator
IsFullHistoryNode bool
}
// HeaderResolver is a wrapper over Resolver that is specialized in resolving headers requests
type HeaderResolver struct {
*baseResolver
baseStorageResolver
messageProcessor
headers dataRetriever.HeadersPool
hdrNoncesStorage storage.Storer
nonceConverter typeConverters.Uint64ByteSliceConverter
epochHandler dataRetriever.EpochHandler
shardCoordinator sharding.Coordinator
}
// NewHeaderResolver creates a new header resolver
func NewHeaderResolver(arg ArgHeaderResolver) (*HeaderResolver, error) {
err := checkArgHeaderResolver(arg)
if err != nil {
return nil, err
}
epochHandler := disabled.NewEpochHandler()
hdrResolver := &HeaderResolver{
baseResolver: &baseResolver{
TopicResolverSender: arg.SenderResolver,
},
headers: arg.Headers,
baseStorageResolver: createBaseStorageResolver(arg.HdrStorage, arg.IsFullHistoryNode),
hdrNoncesStorage: arg.HeadersNoncesStorage,
nonceConverter: arg.NonceConverter,
epochHandler: epochHandler,
shardCoordinator: arg.ShardCoordinator,
messageProcessor: messageProcessor{
marshalizer: arg.Marshaller,
antifloodHandler: arg.AntifloodHandler,
topic: arg.SenderResolver.RequestTopic(),
throttler: arg.Throttler,
},
}
return hdrResolver, nil
}
func checkArgHeaderResolver(arg ArgHeaderResolver) error {
err := checkArgBase(arg.ArgBaseResolver)
if err != nil {
return err
}
if check.IfNil(arg.Headers) {
return dataRetriever.ErrNilHeadersDataPool
}
if check.IfNil(arg.HdrStorage) {
return dataRetriever.ErrNilHeadersStorage
}
if check.IfNil(arg.HeadersNoncesStorage) {
return dataRetriever.ErrNilHeadersNoncesStorage
}
if check.IfNil(arg.NonceConverter) {
return dataRetriever.ErrNilUint64ByteSliceConverter
}
if check.IfNil(arg.ShardCoordinator) {
return dataRetriever.ErrNilShardCoordinator
}
return nil
}
// SetEpochHandler sets the epoch handler for this component
func (hdrRes *HeaderResolver) SetEpochHandler(epochHandler dataRetriever.EpochHandler) error {
if check.IfNil(epochHandler) {
return dataRetriever.ErrNilEpochHandler
}
hdrRes.epochHandler = epochHandler
return nil
}
// ProcessReceivedMessage will be the callback func from the p2p.Messenger and will be called each time a new message was received
// (for the topic this validator was registered to, usually a request topic)
func (hdrRes *HeaderResolver) ProcessReceivedMessage(message p2p.MessageP2P, fromConnectedPeer core.PeerID) error {
err := hdrRes.canProcessMessage(message, fromConnectedPeer)
if err != nil {
return err
}
hdrRes.throttler.StartProcessing()
defer hdrRes.throttler.EndProcessing()
rd, err := hdrRes.parseReceivedMessage(message, fromConnectedPeer)
if err != nil {
return err
}
var buff []byte
switch rd.Type {
case dataRetriever.HashType:
buff, err = hdrRes.resolveHeaderFromHash(rd)
case dataRetriever.NonceType:
buff, err = hdrRes.resolveHeaderFromNonce(rd)
case dataRetriever.EpochType:
buff, err = hdrRes.resolveHeaderFromEpoch(rd.Value)
default:
return dataRetriever.ErrResolveTypeUnknown
}
if err != nil {
hdrRes.ResolverDebugHandler().LogFailedToResolveData(
hdrRes.topic,
rd.Value,
err,
)
return err
}
if buff == nil {
hdrRes.ResolverDebugHandler().LogFailedToResolveData(
hdrRes.topic,
rd.Value,
dataRetriever.ErrMissingData,
)
log.Trace("missing data",
"data", rd)
return nil
}
hdrRes.ResolverDebugHandler().LogSucceededToResolveData(hdrRes.topic, rd.Value)
return hdrRes.Send(buff, message.Peer())
}
func (hdrRes *HeaderResolver) resolveHeaderFromNonce(rd *dataRetriever.RequestData) ([]byte, error) {
// key is now an encoded nonce (uint64)
nonce, err := hdrRes.nonceConverter.ToUint64(rd.Value)
if err != nil {
return nil, dataRetriever.ErrInvalidNonceByteSlice
}
epoch := rd.Epoch
// header-nonces storer contains un-pruned data, so it is safe to search like this
hash, err := hdrRes.hdrNoncesStorage.SearchFirst(rd.Value)
if err != nil {
log.Trace("hdrNoncesStorage.Get from calculated epoch", "error", err.Error())
// Search the nonce-key pair in data pool
var hdrBytes []byte
hdrBytes, err = hdrRes.searchInCache(nonce)
if err != nil {
return nil, err
}
return hdrBytes, nil
}
newRd := &dataRetriever.RequestData{
Type: rd.Type,
Value: hash,
Epoch: epoch,
}
return hdrRes.resolveHeaderFromHash(newRd)
}
func (hdrRes *HeaderResolver) searchInCache(nonce uint64) ([]byte, error) {
headers, _, err := hdrRes.headers.GetHeadersByNonceAndShardId(nonce, hdrRes.TargetShardID())
if err != nil {
return nil, err
}
hdr := headers[len(headers)-1]
buff, err := hdrRes.marshalizer.Marshal(hdr)
if err != nil {
return nil, err
}
return buff, nil
}
// resolveHeaderFromHash resolves a header using its key (header hash)
func (hdrRes *HeaderResolver) resolveHeaderFromHash(rd *dataRetriever.RequestData) ([]byte, error) {
value, err := hdrRes.headers.GetHeaderByHash(rd.Value)
if err != nil {
return hdrRes.getFromStorage(rd.Value, rd.Epoch)
}
return hdrRes.marshalizer.Marshal(value)
}
// resolveHeaderFromEpoch resolves a header using its key based on epoch
func (hdrRes *HeaderResolver) resolveHeaderFromEpoch(key []byte) ([]byte, error) {
actualKey := key
isUnknownEpoch, err := core.IsUnknownEpochIdentifier(key)
if err != nil {
return nil, err
}
if isUnknownEpoch {
actualKey = []byte(core.EpochStartIdentifier(hdrRes.epochHandler.MetaEpoch()))
}
return hdrRes.searchFirst(actualKey)
}
// RequestDataFromHash requests a header from other peers having input the hdr hash
func (hdrRes *HeaderResolver) RequestDataFromHash(hash []byte, epoch uint32) error {
return hdrRes.SendOnRequestTopic(
&dataRetriever.RequestData{
Type: dataRetriever.HashType,
Value: hash,
Epoch: epoch,
},
[][]byte{hash},
)
}
// RequestDataFromNonce requests a header from other peers having input the hdr nonce
func (hdrRes *HeaderResolver) RequestDataFromNonce(nonce uint64, epoch uint32) error {
return hdrRes.SendOnRequestTopic(
&dataRetriever.RequestData{
Type: dataRetriever.NonceType,
Value: hdrRes.nonceConverter.ToByteSlice(nonce),
Epoch: epoch,
},
[][]byte{hdrRes.nonceConverter.ToByteSlice(nonce)},
)
}
// RequestDataFromEpoch requests a header from other peers having input the epoch
func (hdrRes *HeaderResolver) RequestDataFromEpoch(identifier []byte) error {
return hdrRes.SendOnRequestTopic(
&dataRetriever.RequestData{
Type: dataRetriever.EpochType,
Value: identifier,
},
[][]byte{identifier},
)
}
// IsInterfaceNil returns true if there is no value under the interface
func (hdrRes *HeaderResolver) IsInterfaceNil() bool {
return hdrRes == nil
}