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routing: add inbound fee support to pathfinding

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Add sender-side support for inbound fees in pathfinding
and route building.
This commit is contained in:
Joost Jager
2022-07-05 15:01:18 +02:00
parent d97e7d30fb
commit 0bae781785
13 changed files with 585 additions and 131 deletions
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27
itest/lnd_multi-hop-payments_test.go
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@@ -70,7 +70,7 @@ func testMultiHopPayments(ht *lntest.HarnessTest) {
// channel edges to relatively large non default values. This makes it
// possible to pick up more subtle fee calculation errors.
maxHtlc := lntest.CalculateMaxHtlc(chanAmt)
const aliceBaseFeeSat = 1
const aliceBaseFeeSat = 20
const aliceFeeRatePPM = 100000
updateChannelPolicy(
ht, alice, chanPointAlice, aliceBaseFeeSat*1000,
@@ -81,8 +81,8 @@ func testMultiHopPayments(ht *lntest.HarnessTest) {
// Define a negative inbound fee for Alice, to verify that this is
// backwards compatible with an older sender ignoring the discount.
const (
aliceInboundBaseFeeMsat = -1
aliceInboundFeeRate = -10000
aliceInboundBaseFeeMsat = -2000
aliceInboundFeeRate = -50000 // 5%
)
updateChannelPolicy(
@@ -119,12 +119,11 @@ func testMultiHopPayments(ht *lntest.HarnessTest) {
ht.AssertAmountPaid("Alice(local) => Bob(remote)", alice,
chanPointAlice, expectedAmountPaidAtoB, int64(0))
// To forward a payment of 1000 sat, Alice is charging a fee of 1 sat +
// 10% = 101 sat. Note that this does not include the inbound fee
// (discount) because there is no sender support yet.
const aliceFeePerPayment = aliceBaseFeeSat +
(paymentAmt * aliceFeeRatePPM / 1_000_000)
const expectedFeeAlice = numPayments * aliceFeePerPayment
// To forward a payment of 1000 sat, Alice is charging a fee of 20 sat +
// 10% = 120 sat, plus the inbound fee over 1120 (= 1000 + 120) sat of
// -2 sat - 5% = -58 sat. This makes a total of 62 sat per payment. For
// 5 payments, it works out to 310 sat.
const expectedFeeAlice = 310
// Dave needs to pay what Alice pays plus Alice's fee.
expectedAmountPaidDtoA := expectedAmountPaidAtoB + expectedFeeAlice
@@ -134,12 +133,10 @@ func testMultiHopPayments(ht *lntest.HarnessTest) {
ht.AssertAmountPaid("Dave(local) => Alice(remote)", dave,
chanPointDave, expectedAmountPaidDtoA, int64(0))
// To forward a payment of 1101 sat, Dave is charging a fee of
// 5 sat + 15% = 170.15 sat. This is rounded down in rpcserver to 170.
const davePaymentAmt = paymentAmt + aliceFeePerPayment
const daveFeePerPayment = daveBaseFeeSat +
(davePaymentAmt * daveFeeRatePPM / 1_000_000)
const expectedFeeDave = numPayments * daveFeePerPayment
// To forward a payment of 1062 sat, Dave is charging a fee of 5 sat +
// 15% = 164.3 sat. For 5 payments this is 821.5 sat. This test works
// with sats, so we need to round down to 821.
const expectedFeeDave = 821
// Carol needs to pay what Dave pays plus Dave's fee.
expectedAmountPaidCtoD := expectedAmountPaidDtoA + expectedFeeDave