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bolt 3: add fee computation example

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sstone 2016-12-19 18:11:17 +01:00
parent e1ae6d2a2e
commit 1bf264bbc5
1 changed files with 33 additions and 1 deletions
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34
eclair-node/src/main/scala/fr/acinq/protos/Bolt3.scala
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@ -3,7 +3,7 @@ package fr.acinq.protos
import fr.acinq.bitcoin._
import fr.acinq.eclair.transactions.Scripts
object Bolt3 {
object Bolt3 extends App {
// TODO: sort tx according to BIP69 (lexicographical ordering)
def baseSize(tx: Transaction) = Transaction.write(tx, Protocol.PROTOCOL_VERSION | Transaction.SERIALIZE_TRANSACTION_NO_WITNESS).length
@ -65,4 +65,36 @@ object Bolt3 {
OP_CHECKSIG :: Nil
// @formatter:on
}
val htlcTimeoutWeight = 634
val htlcSuccessWeight = 671
def weight2fee(feeRatePerKw: Int, weight: Int) = Satoshi((feeRatePerKw * weight) / 1024)
def htlcTimeoutFee(feeRatePerKw: Int): Satoshi = weight2fee(feeRatePerKw, htlcTimeoutWeight)
def htlcSuccessFee(feeRatePerKw: Int): Satoshi = weight2fee(feeRatePerKw, htlcSuccessWeight)
def commitTxFee(feeRatePerKw: Int, dustLimit: Satoshi, htlcOffered: Seq[MilliSatoshi], htlcReceived: Seq[MilliSatoshi]): Satoshi = {
println(s"HTLC timeout tx fee: ${htlcTimeoutFee(feeRatePerKw)}")
println(s"HTLC success tx fee: ${htlcSuccessFee(feeRatePerKw)}")
val (weight, fee) = htlcOffered.foldLeft((724, 0 satoshi)) {
case ((weight, fee), amount) if millisatoshi2satoshi(amount).compare(dustLimit + htlcTimeoutFee(feeRatePerKw)) < 0 =>
println(s"offered htlc amount $amount is too small")
(weight, fee + amount)
case ((weight, fee), _) => (weight + 172, fee)
}
val (weight1, fee1) = htlcReceived.foldLeft((weight, fee)) {
case ((weight, fee), amount) if millisatoshi2satoshi(amount).compare(dustLimit + htlcSuccessFee(feeRatePerKw)) < 0 =>
println(s"received htlc amount $amount is too small")
(weight, fee + amount)
case ((weight, fee), _) => (weight + 172, fee)
}
weight2fee(feeRatePerKw, weight1) + fee
}
println(s"HTLC timeout fee: ")
val fee = commitTxFee(5000, 546 satoshi, Seq(5000 satoshi, 1000 satoshi), Seq(7000 satoshi, 800 satoshi))
println(fee)
}