2.1.0 final

build.sbt

@@ -25,7 +25,7 @@ lazy val commonSettings = Seq(
     Wart.OptionPartial),
   organization := "io.horizen",
   organizationName := "Zen Blockchain Foundation",
-  version := "2.0.3",
+  version := "2.1.0",
   licenses := Seq("CC0" -> url("https://creativecommons.org/publicdomain/zero/1.0/legalcode")),
   homepage := Some(url("https://github.com/HorizenOfficial/Sparkz")),
   pomExtra :=

release-notes.md

@@ -1,3 +1,12 @@
+2.1.0
+---------
+* Added support for forger's connections prioritization
+* Node synchronization improvements:
+  * Optimization of lookup strategy in modifiersCache
+  * Preserve the order of block during synchronization
+* Added option to force only connecting to known peers
+* Fixes/Improvements on the way the SyncTracker handles the internal statuses maps
+
 2.0.3
 ---------
 * Fix in the handshake process - start connecting to nodes only after the Synchronizer is initialized

src/main/resources/reference.conf

@@ -90,6 +90,9 @@ sparkz {
     # List of IP addresses of well known nodes.
     knownPeers = []
 
+    # Force node to only try connecting to known peers
+    onlyConnectToKnownPeers = false
+
     # Interval between GetPeers messages to be send by our node to a random one
     getPeersInterval = 2m
 
@@ -99,6 +102,9 @@ sparkz {
     # Number of outgoing network connections
     maxOutgoingConnections = 10
 
+    # Number of dedicated connections to forgers. This works in addition to the maxOutgoingConnections ones
+    maxForgerConnections = 20
+
     # Network connection timeout
     connectionTimeout = 1s
 
@@ -219,6 +225,9 @@ sparkz {
 
     # Enables transactions in the mempool
     handlingTransactionsEnabled = true
+
+    # Is this node a forger
+    isForgerNode = false
   }
 
   ntp {

src/main/scala/sparkz/ObjectGenerators.scala

@@ -76,7 +76,7 @@ trait ObjectGenerators {
 
   lazy val modifiersGen: Gen[ModifiersData] = for {
     modifierTypeId: ModifierTypeId <- modifierTypeIdGen
-    modifiers: Map[ModifierId, Array[Byte]] <- Gen.nonEmptyMap(modifierWithIdGen).suchThat(_.nonEmpty)
+    modifiers: Seq[(ModifierId, Array[Byte])] <- Gen.nonEmptyListOf(modifierWithIdGen).suchThat(_.nonEmpty)
   } yield ModifiersData(modifierTypeId, modifiers)
 
   lazy val appVersionGen: Gen[Version] = for {

src/main/scala/sparkz/core/ModifiersCache.scala

@@ -22,7 +22,7 @@ trait ModifiersCache[PMOD <: PersistentNodeViewModifier, H <: HistoryReader[PMOD
   type K = sparkz.util.ModifierId
   type V = PMOD
 
-  protected val cache: mutable.Map[K, V] = mutable.Map[K, V]()
+  protected val cache: mutable.Map[K, V] = mutable.LinkedHashMap[K, V]()
 
   override def modifierById(modifierId: sparkz.util.ModifierId): Option[PMOD] = cache.get(modifierId)
 

src/main/scala/sparkz/core/api/http/PeersApiRoute.scala

@@ -6,15 +6,14 @@ import akka.http.scaladsl.server.Route
 import io.circe.generic.auto.exportDecoder
 import io.circe.generic.semiauto._
 import io.circe.syntax._
-import io.circe.{Encoder, Decoder, Json}
+import io.circe.{Decoder, Encoder, Json}
 import sparkz.core.api.http.PeersApiRoute.PeerApiRequest.AddToBlacklistBodyRequest
 import sparkz.core.api.http.PeersApiRoute.Request.ConnectBodyRequest
 import sparkz.core.api.http.PeersApiRoute.{BlacklistedPeers, PeerInfoResponse, PeersStatusResponse}
 import sparkz.core.network.ConnectedPeer
-import sparkz.core.network.NetworkController.ReceivableMessages.{ConnectTo, GetConnectedPeers, GetPeersStatus}
+import sparkz.core.network.NetworkController.ReceivableMessages.{ConnectTo, DisconnectFromNode, GetConnectedPeers, GetPeersStatus}
 import sparkz.core.network.peer.PeerManager.ReceivableMessages._
 import sparkz.core.network.peer.PenaltyType.CustomPenaltyDuration
-import sparkz.core.network.peer.PeerManager.ReceivableMessages.{AddPeersIfEmpty, GetAllPeers, GetBlacklistedPeers}
 import sparkz.core.network.peer.{PeerInfo, PeersStatus}
 import sparkz.core.settings.RESTApiSettings
 import sparkz.core.utils.NetworkTimeProvider
@@ -179,7 +178,7 @@ case class PeersApiRoute(peerManager: ActorRef,
             val port = addressAndPort.group(2).toInt
             val peerAddress = new InetSocketAddress(host, port)
             peerManager ! RemovePeer(peerAddress)
-            networkController ! DisconnectFromAddress(peerAddress)
+            networkController ! DisconnectFromNode(peerAddress)
             ApiResponse.OK
         }
       }

src/main/scala/sparkz/core/network/ConnectedPeer.scala

@@ -16,7 +16,7 @@ case class ConnectedPeer(connectionId: ConnectionId,
                          var lastMessage: Long,
                          peerInfo: Option[PeerInfo]) {
 
-  override def hashCode(): Int = connectionId.hashCode()
+  override def hashCode(): Int = connectionId.remoteAddress.hashCode()
 
   override def equals(obj: Any): Boolean = obj match {
     case that: ConnectedPeer => this.connectionId.remoteAddress == that.connectionId.remoteAddress

src/main/scala/sparkz/core/network/NetworkController.scala

@@ -61,7 +61,7 @@ class NetworkController(settings: NetworkSettings,
 
   private var connections = Map.empty[InetSocketAddress, ConnectedPeer]
   private var unconfirmedConnections = Set.empty[InetSocketAddress]
-  private val maxConnections = settings.maxIncomingConnections + settings.maxOutgoingConnections
+  private val maxConnections = settings.maxIncomingConnections + settings.maxOutgoingConnections + settings.maxForgerConnections
   private val peersLastConnectionAttempts = new LRUSimpleCache[InetSocketAddress, TimeProvider.Time](threshold = 10000)
 
   private val tryNewConnectionAttemptDelay = 5.seconds
@@ -150,6 +150,10 @@ class NetworkController(settings: NetworkSettings,
 
     case DisconnectFromAddress(peerAddress) =>
       closeConnection(peerAddress)
+
+    case DisconnectFromNode(peerAddress) =>
+      closeConnectionFromNode(peerAddress)
+
   }
 
   private def connectionEvents: Receive = {
@@ -208,7 +212,7 @@ class NetworkController(settings: NetworkSettings,
     log.info(s"Unconfirmed connection: ($remoteAddress, $localAddress) => $connectionId")
 
     val handlerRef = sender()
-    if (connectionDirection.isOutgoing && canEstablishNewOutgoingConnection) {
+    if (connectionDirection.isOutgoing && (canEstablishNewOutgoingConnection || canEstablishNewForgerConnection)) {
       createPeerConnectionHandler(connectionId, handlerRef)
     }
     else if (connectionDirection.isIncoming && canEstablishNewIncomingConnection)
@@ -260,7 +264,7 @@ class NetworkController(settings: NetworkSettings,
     */
   private def scheduleConnectionToPeer(): Unit = {
     val connectionTask: Runnable = () => {
-      if (canEstablishNewOutgoingConnection) {
+      if (canEstablishNewOutgoingConnection  || canEstablishNewForgerConnection) {
         log.trace(s"Looking for a new random connection")
         connectionToPeer(connections, unconfirmedConnections)
       }
@@ -277,6 +281,22 @@ class NetworkController(settings: NetworkSettings,
     getIncomingConnectionsSize < settings.maxIncomingConnections
   }
 
+  private def canEstablishNewForgerConnection: Boolean = {
+    getForgerConnectionsSize < settings.maxForgerConnections
+  }
+
+  private def shouldDropForgerConnection: Boolean = {
+    getForgerConnectionsSize > settings.maxForgerConnections
+  }
+
+  private def shouldDropOutgoingConnection: Boolean = {
+    getOutgoingConnectionsSize > settings.maxOutgoingConnections
+  }
+
+  private def shouldDropIncomingConnection: Boolean = {
+    getIncomingConnectionsSize > settings.maxIncomingConnections
+  }
+
   private def getOutgoingConnectionsSize: Int = {
     connections.count { p => p._2.connectionId.direction == Outgoing }
   }
@@ -285,6 +305,10 @@ class NetworkController(settings: NetworkSettings,
     connections.count { p => p._2.connectionId.direction == Incoming }
   }
 
+  private def getForgerConnectionsSize: Int = {
+    connections.count { p => p._2.peerInfo.exists(_.peerSpec.features.contains(ForgerNodePeerFeature())) }
+  }
+
   private def connectionToPeer(activeConnections: Map[InetSocketAddress, ConnectedPeer], unconfirmedConnections: Set[InetSocketAddress]): Unit = {
     val connectionsAddressSeq = activeConnections.values.flatMap(_.peerInfo).toSeq
     val unconfirmedConnectionsAddressSeq = unconfirmedConnections.map(connection => PeerInfo.fromAddress(connection)).toSeq
@@ -380,19 +404,17 @@ class NetworkController(settings: NetworkSettings,
       }
     }
     val isLocal = NetworkUtils.isLocalAddress(connectionId.remoteAddress.getAddress)
-    val mandatoryFeatures = if (settings.handlingTransactionsEnabled) {
-      sparkzContext.features :+ mySessionIdFeature
-    }
-    else {
-      sparkzContext.features :+ mySessionIdFeature :+ TransactionsDisabledPeerFeature()
-    }
-    val peerFeatures = if (isLocal) {
+    val mandatoryFeatures = sparkzContext.features :+ mySessionIdFeature
+
+    val maybeTransactionDisabledFeature =
+      if (settings.handlingTransactionsEnabled) None else Some(TransactionsDisabledPeerFeature())
+    val maybeLocalAddressFeature = if (isLocal) {
       val la = new InetSocketAddress(connectionId.localAddress.getAddress, settings.bindAddress.getPort)
-      val localAddrFeature = LocalAddressPeerFeature(la)
-      mandatoryFeatures :+ localAddrFeature
-    } else {
-      mandatoryFeatures
-    }
+      Some(LocalAddressPeerFeature(la))
+    } else None
+    val maybeForgerNodeFeature = if (settings.isForgerNode) Some(ForgerNodePeerFeature()) else None
+
+    val peerFeatures = mandatoryFeatures ++ maybeTransactionDisabledFeature ++ maybeLocalAddressFeature ++ maybeForgerNodeFeature
     val selfAddressOpt = getNodeAddressForPeer(connectionId.localAddress)
 
     if (selfAddressOpt.isEmpty)
@@ -417,13 +439,20 @@ class NetworkController(settings: NetworkSettings,
       // Drop connection to self if occurred or peer already connected.
       // Decision whether connection is local or is from some other network is made
       // based on SessionIdPeerFeature if exists or in old way using isSelf() function
-      val shouldDrop =
+      var shouldDrop =
         connectionForPeerAddress(peerAddress).exists(_.handlerRef != peerHandlerRef) ||
         peerInfo.peerSpec.features.collectFirst {
           case SessionIdPeerFeature(networkMagic, sessionId) =>
             !networkMagic.sameElements(mySessionIdFeature.networkMagic) || sessionId == mySessionIdFeature.sessionId
         }.getOrElse(isSelf(remoteAddress))
 
+      // We allow temporary overflowing outgoing connection limits to get the peerInfo and see if peer if a forger.
+      // Drop connection if the peer does not fit in the limits.
+      val isForgerConnection = peerInfo.peerSpec.features.contains(ForgerNodePeerFeature())
+
+      val connectionLimitExhausted = isConnectionLimitExhausted(peerInfo, isForgerConnection)
+      shouldDrop = shouldDrop || connectionLimitExhausted
+
       if (shouldDrop) {
         connectedPeer.handlerRef ! CloseConnection
         peerManagerRef ! RemovePeer(peerAddress)
@@ -438,6 +467,12 @@ class NetworkController(settings: NetworkSettings,
     }
   }
 
+  private[network] def isConnectionLimitExhausted(peerInfo: PeerInfo, isForgerConnection: Boolean) = {
+    (isForgerConnection && shouldDropForgerConnection) ||
+      (!isForgerConnection && peerInfo.connectionType.contains(Incoming) && shouldDropIncomingConnection) ||
+      (!isForgerConnection && peerInfo.connectionType.contains(Outgoing) && shouldDropOutgoingConnection)
+  }
+
   /**
     * Returns connections filtered by given SendingStrategy and Version.
     * Exclude all connections with lower version and apply sendingStrategy to remaining connected peers
@@ -557,6 +592,16 @@ class NetworkController(settings: NetworkSettings,
     }
   }
 
+  private def closeConnectionFromNode(peerAddress: InetSocketAddress): Unit = {
+    connections = connections.filterNot {
+      case (address, connectedPeer) if address == peerAddress =>
+          connectedPeer.handlerRef ! CloseConnection
+          context.system.eventStream.publish(DisconnectedPeer(peerAddress))
+          true // exclude the entry from the filtered map
+      case _ => false // don't modify the connections map
+    }
+  }
+
   /**
     * Register a new penalty for given peer address.
     */
@@ -583,6 +628,8 @@ object NetworkController {
 
     case class DisconnectFrom(peer: ConnectedPeer)
 
+    case class DisconnectFromNode(address: InetSocketAddress)
+
     case class PenalizePeer(address: InetSocketAddress, penaltyType: PenaltyType)
 
     case class GetFilteredConnectedPeers(sendingStrategy: SendingStrategy, version: Version)