Add per-peer profit scoring

We create a new actor that keeps track of payment statistics across our
peers and rank them to identify the top profit earners. Based on those
statistics, the actor issues recommendations to:

- allocate more liquidity towards nodes that are generating revenue and
  may run out of liquidity in the next few days
- reclaim liquidity from inactive channels
- change our relay fees to optimize increases or decreases in outgoing
  flow and volume

Author: t-bast

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

@@ -44,6 +44,7 @@ import fr.acinq.eclair.payment.offer.{DefaultOfferHandler, OfferManager}
 import fr.acinq.eclair.payment.receive.PaymentHandler
 import fr.acinq.eclair.payment.relay.{AsyncPaymentTriggerer, PostRestartHtlcCleaner, Relayer}
 import fr.acinq.eclair.payment.send.{Autoprobe, PaymentInitiator}
+import fr.acinq.eclair.profit.PeerScorer
 import fr.acinq.eclair.reputation.ReputationRecorder
 import fr.acinq.eclair.router._
 import fr.acinq.eclair.tor.{Controller, TorProtocolHandler}
@@ -400,8 +401,8 @@ class Setup(val datadir: File,
       _ = for (i <- 0 until config.getInt("autoprobe-count")) yield system.actorOf(SimpleSupervisor.props(Autoprobe.props(nodeParams, router, paymentInitiator), s"payment-autoprobe-$i", SupervisorStrategy.Restart))
 
       balanceActor = system.spawn(BalanceActor(bitcoinClient, nodeParams.channelConf.minDepth, channelsListener, nodeParams.balanceCheckInterval), name = "balance-actor")
-
       postman = system.spawn(Behaviors.supervise(Postman(nodeParams, switchboard, router.toTyped, register, offerManager)).onFailure(typed.SupervisorStrategy.restart), name = "postman")
+      peerScorer = system.spawn(Behaviors.supervise(PeerScorer(nodeParams.db.audit, channels)).onFailure(typed.SupervisorStrategy.restart), name = "peer-scorer")
 
       kit = Kit(
         nodeParams = nodeParams,