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topicResolverSender.go
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/
topicResolverSender.go
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package topicResolverSender
import (
"fmt"
"sync"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/core/random"
"github.com/ElrondNetwork/elrond-go/dataRetriever"
resolverDebug "github.com/ElrondNetwork/elrond-go/debug/resolver"
"github.com/ElrondNetwork/elrond-go/marshal"
"github.com/ElrondNetwork/elrond-go/p2p"
"github.com/ElrondNetwork/elrond-go/p2p/message"
)
// topicRequestSuffix represents the topic name suffix
const topicRequestSuffix = "_REQUEST"
const minPeersToQuery = 2
var _ dataRetriever.TopicResolverSender = (*topicResolverSender)(nil)
// ArgTopicResolverSender is the argument structure used to create new TopicResolverSender instance
type ArgTopicResolverSender struct {
Messenger dataRetriever.MessageHandler
TopicName string
PeerListCreator dataRetriever.PeerListCreator
Marshalizer marshal.Marshalizer
Randomizer dataRetriever.IntRandomizer
TargetShardId uint32
OutputAntiflooder dataRetriever.P2PAntifloodHandler
NumIntraShardPeers int
NumCrossShardPeers int
}
type topicResolverSender struct {
messenger dataRetriever.MessageHandler
marshalizer marshal.Marshalizer
topicName string
peerListCreator dataRetriever.PeerListCreator
randomizer dataRetriever.IntRandomizer
targetShardId uint32
outputAntiflooder dataRetriever.P2PAntifloodHandler
mutNumPeersToQuery sync.RWMutex
numIntraShardPeers int
numCrossShardPeers int
mutResolverDebugHandler sync.RWMutex
resolverDebugHandler dataRetriever.ResolverDebugHandler
}
// NewTopicResolverSender returns a new topic resolver instance
func NewTopicResolverSender(arg ArgTopicResolverSender) (*topicResolverSender, error) {
if check.IfNil(arg.Messenger) {
return nil, dataRetriever.ErrNilMessenger
}
if check.IfNil(arg.Marshalizer) {
return nil, dataRetriever.ErrNilMarshalizer
}
if check.IfNil(arg.Randomizer) {
return nil, dataRetriever.ErrNilRandomizer
}
if check.IfNil(arg.PeerListCreator) {
return nil, dataRetriever.ErrNilPeerListCreator
}
if check.IfNil(arg.OutputAntiflooder) {
return nil, dataRetriever.ErrNilAntifloodHandler
}
if arg.NumIntraShardPeers < 0 {
return nil, fmt.Errorf("%w for NumIntraShardPeers as the value should be greater or equal than 0",
dataRetriever.ErrInvalidValue)
}
if arg.NumCrossShardPeers < 0 {
return nil, fmt.Errorf("%w for NumCrossShardPeers as the value should be greater or equal than 0",
dataRetriever.ErrInvalidValue)
}
if arg.NumCrossShardPeers+arg.NumIntraShardPeers < minPeersToQuery {
return nil, fmt.Errorf("%w for NumCrossShardPeers, NumIntraShardPeers as their sum should be greater or equal than %d",
dataRetriever.ErrInvalidValue, minPeersToQuery)
}
resolver := &topicResolverSender{
messenger: arg.Messenger,
topicName: arg.TopicName,
peerListCreator: arg.PeerListCreator,
marshalizer: arg.Marshalizer,
randomizer: arg.Randomizer,
targetShardId: arg.TargetShardId,
outputAntiflooder: arg.OutputAntiflooder,
numIntraShardPeers: arg.NumIntraShardPeers,
numCrossShardPeers: arg.NumCrossShardPeers,
}
resolver.resolverDebugHandler = resolverDebug.NewDisabledInterceptorResolver()
return resolver, nil
}
// SendOnRequestTopic is used to send request data over channels (topics) to other peers
// This method only sends the request, the received data should be handled by interceptors
func (trs *topicResolverSender) SendOnRequestTopic(rd *dataRetriever.RequestData, originalHashes [][]byte) error {
buff, err := trs.marshalizer.Marshal(rd)
if err != nil {
return err
}
topicToSendRequest := trs.topicName + topicRequestSuffix
crossPeers := trs.peerListCreator.PeerList()
numSentCross := trs.sendOnTopic(crossPeers, topicToSendRequest, buff, trs.numCrossShardPeers)
intraPeers := trs.peerListCreator.IntraShardPeerList()
numSentIntra := trs.sendOnTopic(intraPeers, topicToSendRequest, buff, trs.numIntraShardPeers)
trs.callDebugHandler(originalHashes, numSentIntra, numSentCross)
if numSentCross+numSentIntra == 0 {
return fmt.Errorf("%w, topic: %s, crossPeers: %d, intraPeers: %d",
dataRetriever.ErrSendRequest,
trs.topicName,
len(crossPeers),
len(intraPeers))
}
return nil
}
func (trs *topicResolverSender) callDebugHandler(originalHashes [][]byte, numSentIntra int, numSentCross int) {
trs.mutResolverDebugHandler.RLock()
defer trs.mutResolverDebugHandler.RUnlock()
trs.resolverDebugHandler.LogRequestedData(trs.topicName, originalHashes, numSentIntra, numSentCross)
}
func createIndexList(listLength int) []int {
indexes := make([]int, listLength)
for i := 0; i < listLength; i++ {
indexes[i] = i
}
return indexes
}
func (trs *topicResolverSender) sendOnTopic(peerList []core.PeerID, topicToSendRequest string, buff []byte, maxToSend int) int {
if len(peerList) == 0 || maxToSend == 0 {
return 0
}
indexes := createIndexList(len(peerList))
shuffledIndexes := random.FisherYatesShuffle(indexes, trs.randomizer)
msgSentCounter := 0
for idx := range shuffledIndexes {
peer := peerList[idx]
err := trs.sendToConnectedPeer(topicToSendRequest, buff, peer)
if err != nil {
continue
}
msgSentCounter++
if msgSentCounter == maxToSend {
break
}
}
return msgSentCounter
}
// Send is used to send an array buffer to a connected peer
// It is used when replying to a request
func (trs *topicResolverSender) Send(buff []byte, peer core.PeerID) error {
return trs.sendToConnectedPeer(trs.topicName, buff, peer)
}
func (trs *topicResolverSender) sendToConnectedPeer(topic string, buff []byte, peer core.PeerID) error {
msg := &message.Message{
DataField: buff,
PeerField: peer,
TopicsField: []string{topic},
}
err := trs.outputAntiflooder.CanProcessMessage(msg, peer)
if err != nil {
return fmt.Errorf("%w while sending %d bytes to peer %s",
err,
len(buff),
p2p.PeerIdToShortString(peer),
)
}
return trs.messenger.SendToConnectedPeer(topic, buff, peer)
}
// ResolverDebugHandler returns the debug handler used in resolvers
func (trs *topicResolverSender) ResolverDebugHandler() dataRetriever.ResolverDebugHandler {
trs.mutResolverDebugHandler.RLock()
defer trs.mutResolverDebugHandler.RUnlock()
return trs.resolverDebugHandler
}
// SetResolverDebugHandler sets the debug handler used in resolvers
func (trs *topicResolverSender) SetResolverDebugHandler(handler dataRetriever.ResolverDebugHandler) error {
if check.IfNil(handler) {
return dataRetriever.ErrNilResolverDebugHandler
}
trs.mutResolverDebugHandler.Lock()
trs.resolverDebugHandler = handler
trs.mutResolverDebugHandler.Unlock()
return nil
}
// RequestTopic returns the topic with the request suffix used for sending requests
func (trs *topicResolverSender) RequestTopic() string {
return trs.topicName + topicRequestSuffix
}
// TargetShardID returns the target shard ID for this resolver should serve data
func (trs *topicResolverSender) TargetShardID() uint32 {
return trs.targetShardId
}
// SetNumPeersToQuery will set the number of intra shard and cross shard number of peers to query
func (trs *topicResolverSender) SetNumPeersToQuery(intra int, cross int) {
trs.mutNumPeersToQuery.Lock()
trs.numIntraShardPeers = intra
trs.numCrossShardPeers = cross
trs.mutNumPeersToQuery.Unlock()
}
// NumPeersToQuery will return the number of intra shard and cross shard number of peer to query
func (trs *topicResolverSender) NumPeersToQuery() (int, int) {
trs.mutNumPeersToQuery.RLock()
defer trs.mutNumPeersToQuery.RUnlock()
return trs.numIntraShardPeers, trs.numCrossShardPeers
}
// IsInterfaceNil returns true if there is no value under the interface
func (trs *topicResolverSender) IsInterfaceNil() bool {
return trs == nil
}