Refactor route finding (#2974)

Refactor the route finding to share the same code for payment routes and onion message routes.

eclair-core/src/main/scala/fr/acinq/eclair/Eclair.scala

@@ -443,7 +443,10 @@ class EclairImpl(appKit: Kit) extends Eclair with Logging {
         for {
           ignoredChannels <- getChannelDescs(ignoreShortChannelIds.toSet)
           ignore = Ignore(ignoreNodeIds.toSet, ignoredChannels)
-          response <- (appKit.router ? RouteRequest(sourceNodeId, target, routeParams1, ignore)).mapTo[RouteResponse]
+          response <- appKit.router.toTyped.ask[PaymentRouteResponse](replyTo => RouteRequest(replyTo, sourceNodeId, target, routeParams1, ignore)).flatMap {
+            case r: RouteResponse => Future.successful(r)
+            case PaymentRouteNotFound(error) => Future.failed(error)
+          }
         } yield response
       case Left(t) => Future.failed(t)
     }

eclair-core/src/main/scala/fr/acinq/eclair/NodeParams.scala

@@ -33,7 +33,7 @@ import fr.acinq.eclair.message.OnionMessages.OnionMessageConfig
 import fr.acinq.eclair.payment.relay.OnTheFlyFunding
 import fr.acinq.eclair.payment.relay.Relayer.{AsyncPaymentsParams, RelayFees, RelayParams}
 import fr.acinq.eclair.router.Announcements.AddressException
-import fr.acinq.eclair.router.Graph.{HeuristicsConstants, WeightRatios}
+import fr.acinq.eclair.router.Graph.{HeuristicsConstants, PaymentWeightRatios}
 import fr.acinq.eclair.router.Router._
 import fr.acinq.eclair.router.{Graph, PathFindingExperimentConf}
 import fr.acinq.eclair.tor.Socks5ProxyParams
@@ -450,20 +450,20 @@ object NodeParams extends Logging {
         maxFeeFlat = Satoshi(config.getLong("boundaries.max-fee-flat-sat")).toMilliSatoshi,
         maxFeeProportional = config.getDouble("boundaries.max-fee-proportional-percent") / 100.0),
       heuristics = if (config.getBoolean("use-ratios")) {
-        Left(WeightRatios(
+        PaymentWeightRatios(
           baseFactor = config.getDouble("ratios.base"),
           cltvDeltaFactor = config.getDouble("ratios.cltv"),
           ageFactor = config.getDouble("ratios.channel-age"),
           capacityFactor = config.getDouble("ratios.channel-capacity"),
-          hopCost = getRelayFees(config.getConfig("hop-cost")),
-        ))
+          hopFees = getRelayFees(config.getConfig("hop-cost")),
+        )
       } else {
-        Right(HeuristicsConstants(
+        HeuristicsConstants(
           lockedFundsRisk = config.getDouble("locked-funds-risk"),
-          failureCost = getRelayFees(config.getConfig("failure-cost")),
-          hopCost = getRelayFees(config.getConfig("hop-cost")),
+          failureFees = getRelayFees(config.getConfig("failure-cost")),
+          hopFees = getRelayFees(config.getConfig("hop-cost")),
           useLogProbability = config.getBoolean("use-log-probability"),
-        ))
+        )
       },
       mpp = MultiPartParams(
         Satoshi(config.getLong("mpp.min-amount-satoshis")).toMilliSatoshi,
@@ -482,7 +482,7 @@ object NodeParams extends Logging {
       val ratioBase = config.getDouble("ratios.base")
       val ratioAge = config.getDouble("ratios.channel-age")
       val ratioCapacity = config.getDouble("ratios.channel-capacity")
-      MessageRouteParams(maxRouteLength, Graph.MessagePath.WeightRatios(ratioBase, ratioAge, ratioCapacity))
+      MessageRouteParams(maxRouteLength, Graph.MessageWeightRatios(ratioBase, ratioAge, ratioCapacity))
     }
 
     val unhandledExceptionStrategy = config.getString("channel.unhandled-exception-strategy") match {

eclair-core/src/main/scala/fr/acinq/eclair/payment/receive/MultiPartHandler.scala

@@ -18,11 +18,11 @@ package fr.acinq.eclair.payment.receive
 
 import akka.actor.Actor.Receive
 import akka.actor.typed.Behavior
+import akka.actor.typed.scaladsl.AskPattern.Askable
 import akka.actor.typed.scaladsl.Behaviors
-import akka.actor.typed.scaladsl.adapter.ClassicActorContextOps
+import akka.actor.typed.scaladsl.adapter.{ClassicActorContextOps, ClassicActorRefOps}
 import akka.actor.{ActorContext, ActorRef, PoisonPill, typed}
 import akka.event.{DiagnosticLoggingAdapter, LoggingAdapter}
-import akka.pattern.ask
 import akka.util.Timeout
 import fr.acinq.bitcoin.scalacompat.Crypto.{PrivateKey, PublicKey}
 import fr.acinq.bitcoin.scalacompat.{ByteVector32, Crypto}
@@ -37,7 +37,7 @@ import fr.acinq.eclair.payment._
 import fr.acinq.eclair.payment.offer.OfferManager
 import fr.acinq.eclair.router.BlindedRouteCreation.{aggregatePaymentInfo, createBlindedRouteFromHops, createBlindedRouteWithoutHops}
 import fr.acinq.eclair.router.Router
-import fr.acinq.eclair.router.Router.{ChannelHop, HopRelayParams}
+import fr.acinq.eclair.router.Router.{ChannelHop, HopRelayParams, PaymentRouteResponse}
 import fr.acinq.eclair.wire.protocol.OfferTypes.{InvoiceRequest, InvoiceTlv}
 import fr.acinq.eclair.wire.protocol.PaymentOnion.FinalPayload
 import fr.acinq.eclair.wire.protocol._
@@ -376,8 +376,7 @@ object MultiPartHandler {
                 val paymentInfo = aggregatePaymentInfo(r.amount, dummyHops, nodeParams.channelConf.minFinalExpiryDelta)
                 Future.successful(PaymentBlindedRoute(contactInfo, paymentInfo))
               } else {
-                implicit val timeout: Timeout = 10.seconds
-                r.router.ask(Router.FinalizeRoute(Router.PredefinedNodeRoute(r.amount, route.nodes))).mapTo[Router.RouteResponse].map(routeResponse => {
+                r.router.toTyped.ask[PaymentRouteResponse](replyTo => Router.FinalizeRoute(replyTo, Router.PredefinedNodeRoute(r.amount, route.nodes)))(10.seconds, context.system.scheduler).mapTo[Router.RouteResponse].map(routeResponse => {
                   val clearRoute = routeResponse.routes.head
                   val blindedRoute = createBlindedRouteFromHops(clearRoute.hops ++ dummyHops, r.pathId, nodeParams.channelConf.htlcMinimum, route.maxFinalExpiryDelta.toCltvExpiry(nodeParams.currentBlockHeight))
                   val contactInfo = route.shortChannelIdDir_opt match {

eclair-core/src/main/scala/fr/acinq/eclair/payment/send/MultiPartPaymentLifecycle.scala

@@ -16,6 +16,7 @@
 
 package fr.acinq.eclair.payment.send
 
+import akka.actor.typed.scaladsl.adapter.ClassicActorRefOps
 import akka.actor.{ActorRef, FSM, Props, Status}
 import akka.event.Logging.MDC
 import fr.acinq.bitcoin.scalacompat.ByteVector32
@@ -58,7 +59,7 @@ class MultiPartPaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig,
       val routeParams = r.routeParams.copy(randomize = false) // we don't randomize the first attempt, regardless of configuration choices
       log.debug("sending {} with maximum fee {}", r.recipient.totalAmount, r.routeParams.getMaxFee(r.recipient.totalAmount))
       val d = PaymentProgress(r, r.maxAttempts, Map.empty, Ignore.empty, retryRouteRequest = false, failures = Nil)
-      router ! createRouteRequest(nodeParams, routeParams, d, cfg)
+      router ! createRouteRequest(self, nodeParams, routeParams, d, cfg)
       goto(WAIT_FOR_ROUTES) using d
   }
 
@@ -74,11 +75,11 @@ class MultiPartPaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig,
         // remaining amount. In that case we discard these routes and send a new request to the router.
         log.debug("discarding routes, another child payment failed so we need to recompute them ({} payments still pending for {})", d.pending.size, d.pending.values.map(_.amount).sum)
         val routeParams = d.request.routeParams.copy(randomize = true) // we randomize route selection when we retry
-        router ! createRouteRequest(nodeParams, routeParams, d, cfg)
+        router ! createRouteRequest(self, nodeParams, routeParams, d, cfg)
         stay() using d.copy(retryRouteRequest = false)
       }
 
-    case Event(Status.Failure(t), d: PaymentProgress) =>
+    case Event(PaymentRouteNotFound(t), d: PaymentProgress) =>
       log.warning("router error: {}", t.getMessage)
       // If no route can be found, we will retry once with the channels that we previously ignored.
       // Channels are mostly ignored for temporary reasons, likely because they didn't have enough balance to forward
@@ -87,7 +88,7 @@ class MultiPartPaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig,
       if (d.ignore.channels.nonEmpty) {
         log.debug("retry sending payment without ignoring channels {} ({} payments still pending for {})", d.ignore.channels.map(_.shortChannelId).mkString(","), d.pending.size, d.pending.values.map(_.amount).sum)
         val routeParams = d.request.routeParams.copy(randomize = true) // we randomize route selection when we retry
-        router ! createRouteRequest(nodeParams, routeParams, d, cfg).copy(ignore = d.ignore.emptyChannels())
+        router ! createRouteRequest(self, nodeParams, routeParams, d, cfg).copy(ignore = d.ignore.emptyChannels())
         retriedFailedChannels = true
         stay() using d.copy(remainingAttempts = (d.remainingAttempts - 1).max(0), ignore = d.ignore.emptyChannels(), retryRouteRequest = false)
       } else {
@@ -135,7 +136,7 @@ class MultiPartPaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig,
         log.debug("child payment failed, retrying payment ({} payments still pending for {})", stillPending.size, stillPending.values.map(_.amount).sum)
         val routeParams = d.request.routeParams.copy(randomize = true) // we randomize route selection when we retry
         val d1 = d.copy(pending = stillPending, ignore = ignore1, failures = d.failures ++ pf.failures, request = d.request.copy(recipient = recipient1), retryRouteRequest = false)
-        router ! createRouteRequest(nodeParams, routeParams, d1, cfg)
+        router ! createRouteRequest(self, nodeParams, routeParams, d1, cfg)
         goto(WAIT_FOR_ROUTES) using d1
       }
 
@@ -164,7 +165,7 @@ class MultiPartPaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig,
       gotoSucceededOrStop(PaymentSucceeded(d.request, ps.paymentPreimage, ps.parts, d.pending - ps.parts.head.id))
 
     case Event(_: RouteResponse, _) => stay()
-    case Event(_: Status.Failure, _) => stay()
+    case Event(_: PaymentRouteNotFound, _) => stay()
   }
 
   when(PAYMENT_SUCCEEDED) {
@@ -190,7 +191,7 @@ class MultiPartPaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig,
       }
 
     case Event(_: RouteResponse, _) => stay()
-    case Event(_: Status.Failure, _) => stay()
+    case Event(_: PaymentRouteNotFound, _) => stay()
   }
 
   private def spawnChildPaymentFsm(childId: UUID): ActorRef = {
@@ -368,8 +369,8 @@ object MultiPartPaymentLifecycle {
    */
   case class PaymentSucceeded(request: SendMultiPartPayment, preimage: ByteVector32, parts: Seq[PartialPayment], pending: Set[UUID]) extends Data
 
-  private def createRouteRequest(nodeParams: NodeParams, routeParams: RouteParams, d: PaymentProgress, cfg: SendPaymentConfig): RouteRequest = {
-    RouteRequest(nodeParams.nodeId, d.request.recipient, routeParams, d.ignore, allowMultiPart = true, d.pending.values.toSeq, Some(cfg.paymentContext))
+  private def createRouteRequest(replyTo: ActorRef, nodeParams: NodeParams, routeParams: RouteParams, d: PaymentProgress, cfg: SendPaymentConfig): RouteRequest = {
+    RouteRequest(replyTo.toTyped, nodeParams.nodeId, d.request.recipient, routeParams, d.ignore, allowMultiPart = true, d.pending.values.toSeq, Some(cfg.paymentContext))
   }
 
   private def createChildPayment(replyTo: ActorRef, route: Route, request: SendMultiPartPayment): SendPaymentToRoute = {

eclair-core/src/main/scala/fr/acinq/eclair/payment/send/PaymentLifecycle.scala

@@ -54,7 +54,7 @@ class PaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig, router: A
     case Event(request: SendPaymentToRoute, WaitingForRequest) =>
       log.debug("sending {} to route {}", request.amount, request.printRoute())
       request.route.fold(
-        hops => router ! FinalizeRoute(hops, request.recipient.extraEdges, paymentContext = Some(cfg.paymentContext)),
+        hops => router ! FinalizeRoute(self, hops, request.recipient.extraEdges, paymentContext = Some(cfg.paymentContext)),
         route => self ! RouteResponse(route :: Nil)
       )
       if (cfg.storeInDb) {
@@ -64,7 +64,7 @@ class PaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig, router: A
 
     case Event(request: SendPaymentToNode, WaitingForRequest) =>
       log.debug("sending {} to {}", request.amount, request.recipient.nodeId)
-      router ! RouteRequest(nodeParams.nodeId, request.recipient, request.routeParams, paymentContext = Some(cfg.paymentContext))
+      router ! RouteRequest(self, nodeParams.nodeId, request.recipient, request.routeParams, paymentContext = Some(cfg.paymentContext))
       if (cfg.storeInDb) {
         paymentsDb.addOutgoingPayment(OutgoingPayment(id, cfg.parentId, cfg.externalId, paymentHash, cfg.paymentType, request.amount, request.recipient.totalAmount, request.recipient.nodeId, TimestampMilli.now(), cfg.invoice, cfg.payerKey_opt, OutgoingPaymentStatus.Pending))
       }
@@ -84,7 +84,7 @@ class PaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig, router: A
           myStop(request, Left(PaymentFailed(id, paymentHash, failures :+ LocalFailure(request.amount, route.fullRoute, error))))
       }
 
-    case Event(Status.Failure(t), WaitingForRoute(request, failures, _)) =>
+    case Event(PaymentRouteNotFound(t), WaitingForRoute(request, failures, _)) =>
       Metrics.PaymentError.withTag(Tags.Failure, Tags.FailureType(LocalFailure(request.amount, Nil, t))).increment()
       myStop(request, Left(PaymentFailed(id, paymentHash, failures :+ LocalFailure(request.amount, Nil, t))))
   }
@@ -135,7 +135,7 @@ class PaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig, router: A
     data.request match {
       case request: SendPaymentToNode =>
         val ignore1 = PaymentFailure.updateIgnored(failure, data.ignore)
-        router ! RouteRequest(nodeParams.nodeId, data.recipient, request.routeParams, ignore1, paymentContext = Some(cfg.paymentContext))
+        router ! RouteRequest(self, nodeParams.nodeId, data.recipient, request.routeParams, ignore1, paymentContext = Some(cfg.paymentContext))
         goto(WAITING_FOR_ROUTE) using WaitingForRoute(data.request, data.failures :+ failure, ignore1)
       case _: SendPaymentToRoute =>
         log.error("unexpected retry during SendPaymentToRoute")
@@ -241,7 +241,7 @@ class PaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig, router: A
               log.error("unexpected retry during SendPaymentToRoute")
               stop(FSM.Normal)
             case request: SendPaymentToNode =>
-              router ! RouteRequest(nodeParams.nodeId, recipient1, request.routeParams, ignore1, paymentContext = Some(cfg.paymentContext))
+              router ! RouteRequest(self, nodeParams.nodeId, recipient1, request.routeParams, ignore1, paymentContext = Some(cfg.paymentContext))
               goto(WAITING_FOR_ROUTE) using WaitingForRoute(request.copy(recipient = recipient1), failures :+ failure, ignore1)
           }
         } else {
@@ -252,7 +252,7 @@ class PaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig, router: A
               log.error("unexpected retry during SendPaymentToRoute")
               stop(FSM.Normal)
             case request: SendPaymentToNode =>
-              router ! RouteRequest(nodeParams.nodeId, recipient, request.routeParams, ignore + nodeId, paymentContext = Some(cfg.paymentContext))
+              router ! RouteRequest(self, nodeParams.nodeId, recipient, request.routeParams, ignore + nodeId, paymentContext = Some(cfg.paymentContext))
               goto(WAITING_FOR_ROUTE) using WaitingForRoute(request, failures :+ failure, ignore + nodeId)
           }
         }
@@ -266,7 +266,7 @@ class PaymentLifecycle(nodeParams: NodeParams, cfg: SendPaymentConfig, router: A
             log.error("unexpected retry during SendPaymentToRoute")
             stop(FSM.Normal)
           case request: SendPaymentToNode =>
-            router ! RouteRequest(nodeParams.nodeId, recipient, request.routeParams, ignore1, paymentContext = Some(cfg.paymentContext))
+            router ! RouteRequest(self, nodeParams.nodeId, recipient, request.routeParams, ignore1, paymentContext = Some(cfg.paymentContext))
             goto(WAITING_FOR_ROUTE) using WaitingForRoute(request, failures :+ failure, ignore1)
         }
       case Right(e@Sphinx.DecryptedFailurePacket(nodeId, failureMessage)) =>

eclair-core/src/main/scala/fr/acinq/eclair/remote/EclairInternalsSerializer.scala

@@ -24,7 +24,7 @@ import fr.acinq.eclair.io.Peer.PeerRoutingMessage
 import fr.acinq.eclair.io.Switchboard.RouterPeerConf
 import fr.acinq.eclair.io.{ClientSpawner, Peer, PeerConnection, Switchboard}
 import fr.acinq.eclair.payment.relay.Relayer.RelayFees
-import fr.acinq.eclair.router.Graph.{HeuristicsConstants, WeightRatios}
+import fr.acinq.eclair.router.Graph.{HeuristicsConstants, PaymentPathWeight, PaymentWeightRatios, WeightRatios}
 import fr.acinq.eclair.router.Router._
 import fr.acinq.eclair.router._
 import fr.acinq.eclair.wire.protocol.CommonCodecs._
@@ -57,27 +57,32 @@ object EclairInternalsSerializer {
     ("feeBase" | millisatoshi) ::
       ("feeProportionalMillionths" | int64)).as[RelayFees]
 
-  val weightRatiosCodec: Codec[WeightRatios] = (
+  val paymentWeightRatiosCodec: Codec[PaymentWeightRatios] = (
     ("baseFactor" | double) ::
       ("cltvDeltaFactor" | double) ::
       ("ageFactor" | double) ::
       ("capacityFactor" | double) ::
-      ("hopCost" | relayFeesCodec)).as[WeightRatios]
+      ("hopCost" | relayFeesCodec)).as[PaymentWeightRatios]
 
   val heuristicsConstantsCodec: Codec[HeuristicsConstants] = (
     ("lockedFundsRisk" | double) ::
       ("failureCost" | relayFeesCodec) ::
       ("hopCost" | relayFeesCodec) ::
       ("useLogProbability" | bool(8))).as[HeuristicsConstants]
 
+  val weightRatiosCodec: Codec[WeightRatios[PaymentPathWeight]] =
+    discriminated[WeightRatios[PaymentPathWeight]].by(uint8)
+      .typecase(0x00, paymentWeightRatiosCodec)
+      .typecase(0xff, heuristicsConstantsCodec)
+
   val multiPartParamsCodec: Codec[MultiPartParams] = (
     ("minPartAmount" | millisatoshi) ::
       ("maxParts" | int32)).as[MultiPartParams]
 
   val pathFindingConfCodec: Codec[PathFindingConf] = (
     ("randomize" | bool(8)) ::
       ("boundaries" | searchBoundariesCodec) ::
-      ("heuristicsParams" | either(bool(8), weightRatiosCodec, heuristicsConstantsCodec)) ::
+      ("heuristicsParams" | weightRatiosCodec) ::
       ("mpp" | multiPartParamsCodec) ::
       ("experimentName" | utf8_32) ::
       ("experimentPercentage" | int32)).as[PathFindingConf]
@@ -90,7 +95,7 @@ object EclairInternalsSerializer {
     ("maxRouteLength" | int32) ::
       (("baseFactor" | double) ::
       ("ageFactor" | double) ::
-      ("capacityFactor" | double)).as[Graph.MessagePath.WeightRatios]).as[MessageRouteParams]
+      ("capacityFactor" | double)).as[Graph.MessageWeightRatios]).as[MessageRouteParams]
 
   val routerConfCodec: Codec[RouterConf] = (
     ("watchSpentWindow" | finiteDurationCodec) ::