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| 1 | +package io.iohk.ethereum.blockchain.sync |
| 2 | + |
| 3 | +import akka.actor.{Actor, ActorLogging, ActorRef, Cancellable, Props, Scheduler} |
| 4 | +import io.iohk.ethereum.domain.BlockHeader |
| 5 | +import io.iohk.ethereum.network.{EtcPeerManagerActor, Peer, PeerId} |
| 6 | +import io.iohk.ethereum.network.EtcPeerManagerActor.PeerInfo |
| 7 | +import io.iohk.ethereum.network.PeerEventBusActor.PeerEvent.MessageFromPeer |
| 8 | +import io.iohk.ethereum.network.PeerEventBusActor.{PeerSelector, Subscribe, Unsubscribe} |
| 9 | +import io.iohk.ethereum.network.PeerEventBusActor.SubscriptionClassifier.MessageClassifier |
| 10 | +import io.iohk.ethereum.network.p2p.messages.PV62.{BlockHeaders, GetBlockHeaders} |
| 11 | +import io.iohk.ethereum.utils.Config.SyncConfig |
| 12 | +import scala.concurrent.duration.FiniteDuration |
| 13 | +import scala.concurrent.ExecutionContext.Implicits.global |
| 14 | + |
| 15 | +class FastSyncPivotBlockSelector( |
| 16 | + val etcPeerManager: ActorRef, |
| 17 | + val peerEventBus: ActorRef, |
| 18 | + val syncConfig: SyncConfig, |
| 19 | + val scheduler: Scheduler |
| 20 | +) extends Actor |
| 21 | + with ActorLogging |
| 22 | + with PeerListSupport |
| 23 | + with BlacklistSupport { |
| 24 | + |
| 25 | + import FastSyncPivotBlockSelector._ |
| 26 | + import syncConfig._ |
| 27 | + |
| 28 | + val fastSync: ActorRef = context.parent |
| 29 | + |
| 30 | + def handleCommonMessages: Receive = handlePeerListMessages orElse handleBlacklistMessages |
| 31 | + |
| 32 | + override def receive: Receive = idle |
| 33 | + |
| 34 | + def idle: Receive = handleCommonMessages orElse { case ChoosePivotBlock => |
| 35 | + val peersUsedToChooseTarget = peersToDownloadFrom.collect { case (peer, PeerInfo(_, _, true, maxBlockNumber, _)) => |
| 36 | + (peer, maxBlockNumber) |
| 37 | + } |
| 38 | + |
| 39 | + if (peersUsedToChooseTarget.size >= minPeersToChoosePivotBlock) { |
| 40 | + tryChooseTargetBlock(peersUsedToChooseTarget) |
| 41 | + } else { |
| 42 | + log.info( |
| 43 | + "Cannot pick pivot block. Need at least {} peers, but there are only {} available at the moment. Retrying in {}", |
| 44 | + minPeersToChoosePivotBlock, |
| 45 | + peersUsedToChooseTarget.size, |
| 46 | + startRetryInterval |
| 47 | + ) |
| 48 | + scheduleRetry(startRetryInterval) |
| 49 | + context become idle |
| 50 | + } |
| 51 | + } |
| 52 | + |
| 53 | + def tryChooseTargetBlock(peersWithBestBlockNumbers: Map[Peer, BigInt]): Unit = { |
| 54 | + val peersSortedByBestNumber = peersWithBestBlockNumbers.toList.sortBy(-_._2) |
| 55 | + val bestPeerBestBlockNumber = peersSortedByBestNumber.head._2 |
| 56 | + val expectedPivotBlock = (bestPeerBestBlockNumber - syncConfig.pivotBlockOffset).max(0) |
| 57 | + val peersToAsk = peersSortedByBestNumber.takeWhile(_._2 >= expectedPivotBlock).map(_._1) |
| 58 | + |
| 59 | + log.info( |
| 60 | + "Trying to choose fast sync pivot block using {} peers. The best block is {}. Ask {} peers for block nr {}", |
| 61 | + peersWithBestBlockNumbers.size, |
| 62 | + bestPeerBestBlockNumber, |
| 63 | + peersToAsk.size, |
| 64 | + expectedPivotBlock |
| 65 | + ) |
| 66 | + |
| 67 | + peersToAsk.foreach { peer => |
| 68 | + peerEventBus ! Subscribe(MessageClassifier(Set(BlockHeaders.code), PeerSelector.WithId(peer.id))) |
| 69 | + etcPeerManager ! EtcPeerManagerActor.SendMessage( |
| 70 | + GetBlockHeaders(Left(expectedPivotBlock), 1, 0, reverse = false), |
| 71 | + peer.id |
| 72 | + ) |
| 73 | + } |
| 74 | + |
| 75 | + val timeout = scheduler.scheduleOnce(peerResponseTimeout, self, PivotBlockTimeout) |
| 76 | + context become waitingForPivotBlock(peersToAsk.map(_.id).toSet, expectedPivotBlock, timeout, Map.empty) |
| 77 | + } |
| 78 | + |
| 79 | + def waitingForPivotBlock( |
| 80 | + peersToAsk: Set[PeerId], |
| 81 | + targetBlockNumber: BigInt, |
| 82 | + timeout: Cancellable, |
| 83 | + headers: Map[BlockHeader, Int] |
| 84 | + ): Receive = |
| 85 | + handleCommonMessages orElse { |
| 86 | + case MessageFromPeer(blockHeaders: BlockHeaders, peerId) => |
| 87 | + peerEventBus ! Unsubscribe(MessageClassifier(Set(BlockHeaders.code), PeerSelector.WithId(peerId))) |
| 88 | + val updatedPeersToAsk = peersToAsk - peerId |
| 89 | + val targetBlockHeaderOpt = blockHeaders.headers.find(header => header.number == targetBlockNumber) |
| 90 | + |
| 91 | + targetBlockHeaderOpt match { |
| 92 | + case Some(targetBlockHeader) => |
| 93 | + log.info("Received vote for {} from {}", targetBlockHeader.hashAsHexString, peerId.value) |
| 94 | + val newValue = headers.find(_._1 == targetBlockHeader).map(_._2 + 1).getOrElse(1) |
| 95 | + val updatedHeaders = headers.updated(targetBlockHeader, newValue) |
| 96 | + val (mostPopularBlockHeader, votes) = updatedHeaders.maxBy(_._2) |
| 97 | + if (votes >= minPeersToChoosePivotBlock) { |
| 98 | + timeout.cancel() |
| 99 | + sendResponseAndCleanup(mostPopularBlockHeader) |
| 100 | + } else if (updatedPeersToAsk.size + votes < minPeersToChoosePivotBlock) { |
| 101 | + timeout.cancel() |
| 102 | + peerEventBus ! Unsubscribe() |
| 103 | + log.info("Not enough votes for pivot block. Retrying in {}", startRetryInterval) |
| 104 | + scheduleRetry(startRetryInterval) |
| 105 | + context become idle |
| 106 | + } else { |
| 107 | + context become waitingForPivotBlock(updatedPeersToAsk, targetBlockNumber, timeout, updatedHeaders) |
| 108 | + } |
| 109 | + case None => |
| 110 | + blacklist(peerId, blacklistDuration, "Did not respond with pivot block header, blacklisting") |
| 111 | + context become waitingForPivotBlock(updatedPeersToAsk, targetBlockNumber, timeout, headers) |
| 112 | + } |
| 113 | + case PivotBlockTimeout => |
| 114 | + peersToAsk.foreach { peerId => |
| 115 | + blacklist(peerId, blacklistDuration, "Did not respond with pivot block header (timeout), blacklisting") |
| 116 | + } |
| 117 | + peerEventBus ! Unsubscribe() |
| 118 | + log.info("Pivot block header receive timeout. Retrying in {}", startRetryInterval) |
| 119 | + scheduleRetry(startRetryInterval) |
| 120 | + context become idle |
| 121 | + } |
| 122 | + |
| 123 | + def scheduleRetry(interval: FiniteDuration): Unit = { |
| 124 | + scheduler.scheduleOnce(interval, self, ChoosePivotBlock) |
| 125 | + } |
| 126 | + |
| 127 | + def sendResponseAndCleanup(pivotBlockHeader: BlockHeader): Unit = { |
| 128 | + log.info("Found pivot block: {} hash: {}", pivotBlockHeader.number, pivotBlockHeader.hashAsHexString) |
| 129 | + fastSync ! Result(pivotBlockHeader) |
| 130 | + peerEventBus ! Unsubscribe() |
| 131 | + context stop self |
| 132 | + } |
| 133 | + |
| 134 | +} |
| 135 | + |
| 136 | +object FastSyncPivotBlockSelector { |
| 137 | + def props(etcPeerManager: ActorRef, peerEventBus: ActorRef, syncConfig: SyncConfig, scheduler: Scheduler): Props = |
| 138 | + Props(new FastSyncPivotBlockSelector(etcPeerManager: ActorRef, peerEventBus, syncConfig, scheduler)) |
| 139 | + |
| 140 | + case object ChoosePivotBlock |
| 141 | + case class Result(targetBlockHeader: BlockHeader) |
| 142 | + |
| 143 | + private case object PivotBlockTimeout |
| 144 | +} |
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