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Added RandomSprayRouter + minor adjusmtents
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121 changes: 121 additions & 0 deletions
121
Modules/DTN/shared/src/main/scala/dtn/routing/RandomSprayRouter.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| package dtn.routing | ||
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| import dtn.{DtnPeer, Packet, Sender, WSEroutingClient, MonitoringClientInterface, NoMonitoringClient} | ||
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| import scala.concurrent.ExecutionContext.Implicits.global | ||
| import scala.concurrent.Future | ||
| import scala.jdk.CollectionConverters.* | ||
| import java.util.concurrent.ConcurrentHashMap | ||
| import java.time.ZonedDateTime | ||
| import dtn.Endpoint | ||
| import scala.util.Random | ||
| import dtn.PreviousNodeBlock | ||
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| /* | ||
| The RandomSprayRouter implements the backup strategy only of the RdtRouter | ||
| */ | ||
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| class RandomSprayRouter( | ||
| ws: WSEroutingClient, | ||
| monitoringClient: MonitoringClientInterface, | ||
| nTotalNodes: Int, | ||
| topNNeighbours: Int | ||
| ) extends BaseRouter(ws: WSEroutingClient, monitoringClient: MonitoringClientInterface) { | ||
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| // will grow indefinitely as we do not garbage collect here | ||
| val tempPreviousNodeStore: ConcurrentHashMap[String, Endpoint] = ConcurrentHashMap() | ||
| val delivered = ConcurrentHashMap[String, Set[String]]() | ||
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| override def onRequestSenderForBundle(packet: Packet.RequestSenderForBundle) | ||
| : Option[Packet.ResponseSenderForBundle] = { | ||
| println(s"received sender-request for bundle: ${packet.bp}") | ||
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| if delivered.getOrDefault(packet.bp.id, Set()).size >= nTotalNodes then { | ||
| println("bundle was forwarded to enough unique neighbours. deleting.") | ||
| tempPreviousNodeStore.remove(packet.bp.id) | ||
| return Option(Packet.ResponseSenderForBundle(bp = packet.bp, clas = List(), delete_afterwards = true)) | ||
| } | ||
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| val source_node: Endpoint = packet.bp.source.extract_node_endpoint() | ||
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| var random_peers: Iterable[DtnPeer] = peers.values().asScala | ||
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| // remove previous node and source node from peers if available | ||
| random_peers = tempPreviousNodeStore.get(packet.bp.id) match | ||
| case null => random_peers.filter(p => !p.eid.equals(source_node)) | ||
| case previous_node: Endpoint => | ||
| random_peers.filter(p => !p.eid.equals(previous_node) && !p.eid.equals(source_node)) | ||
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| println(s"filtered random peers available: ${List.from(random_peers).map(peer => peer.eid)}") | ||
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| // use peer-info and available clas' to build a list of cla-connections to forward the bundle over | ||
| val selected_clas: List[Sender] = Random.shuffle(random_peers).take(topNNeighbours).flatMap(target => { | ||
| target.cla_list | ||
| .filter((agent, port_option) => packet.clas.contains(agent)) | ||
| .map((agent, port_option) => | ||
| Sender(remote = target.addr, port = port_option, agent = agent, next_hop = target.eid) | ||
| ) | ||
| }).toList | ||
| println(s"selected clas: $selected_clas") | ||
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| println(s"time: ${ZonedDateTime.now()}") | ||
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| return Option(Packet.ResponseSenderForBundle( | ||
| bp = packet.bp, | ||
| clas = selected_clas, | ||
| delete_afterwards = false | ||
| )) | ||
| } | ||
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| override def onError(packet: Packet.Error): Unit = { | ||
| println(s"received error from dtnd: ${packet.reason}") | ||
| } | ||
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| override def onTimeout(packet: Packet.Timeout): Unit = { | ||
| println(s"sending ran into timeout for bundle-forward-response ${packet.bp}") | ||
| } | ||
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| override def onSendingFailed(packet: Packet.SendingFailed): Unit = { | ||
| println(s"sending failed for bundle ${packet.bid} on cla ${packet.cla_sender}") | ||
| } | ||
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| override def onSendingSucceeded(packet: Packet.SendingSucceeded): Unit = { | ||
| println(s"sending succeeded for bundle ${packet.bid} on cla ${packet.cla_sender}.") | ||
| delivered.get(packet.bid) match { | ||
| case null => | ||
| delivered.put(packet.bid, Set(packet.cla_sender)) | ||
| () | ||
| case x: Set[String] => | ||
| delivered.put(packet.bid, (x + packet.cla_sender)) | ||
| () | ||
| } | ||
| } | ||
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| override def onIncomingBundle(packet: Packet.IncomingBundle): Unit = { | ||
| println("received incoming bundle. extracting previous node info") | ||
| packet.bndl.other_blocks.collectFirst { | ||
| case x: PreviousNodeBlock => x | ||
| } match { | ||
| case None => println("received incoming bundle without previous node block. ignoring") | ||
| case Some(previous_node_block) => tempPreviousNodeStore.put(packet.bndl.id, previous_node_block.previous_node_id) | ||
| } | ||
| () | ||
| } | ||
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| override def onIncomingBundleWithoutPreviousNode(packet: Packet.IncomingBundleWithoutPreviousNode): Unit = { | ||
| println("received incoming bundle without previous node. information not used for routing. ignoring.") | ||
| } | ||
| } | ||
| object RandomSprayRouter { | ||
| val N_TOTAL_NODES = 10 | ||
| val TOP_N_NEIGHBOURS = 3 | ||
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| def apply( | ||
| host: String, | ||
| port: Int, | ||
| monitoringClient: MonitoringClientInterface = NoMonitoringClient, | ||
| nTotalNodes: Int = N_TOTAL_NODES, | ||
| topNNeighbours: Int = TOP_N_NEIGHBOURS, | ||
| ): Future[RandomSprayRouter] = | ||
| WSEroutingClient(host, port).map(ws => new RandomSprayRouter(ws, monitoringClient, nTotalNodes, topNNeighbours)) | ||
| } |
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