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routing: add inbound fee support for BuildRoute

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This commit is contained in:
bitromortac
2024-07-30 14:17:47 +02:00
parent 36cd03669b
commit 8b32e3e785
5 changed files with 105 additions and 43 deletions
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7
channeldb/graph_test.go
View File

@@ -3688,7 +3688,7 @@ func TestLightningNodeSigVerification(t *testing.T) {
}
}
// TestComputeFee tests fee calculation based on both in- and outgoing amt.
// TestComputeFee tests fee calculation based on the outgoing amt.
func TestComputeFee(t *testing.T) {
var (
policy = models.ChannelEdgePolicy{
@@ -3703,11 +3703,6 @@ func TestComputeFee(t *testing.T) {
if fee != expectedFee {
t.Fatalf("expected fee %v, got %v", expectedFee, fee)
}
fwdFee := policy.ComputeFeeFromIncoming(outgoingAmt + fee)
if fwdFee != expectedFee {
t.Fatalf("expected fee %v, but got %v", fee, fwdFee)
}
}
// TestBatchedAddChannelEdge asserts that BatchedAddChannelEdge properly

11
channeldb/models/cached_edge_policy.go
View File

@@ -71,17 +71,6 @@ func (c *CachedEdgePolicy) ComputeFee(
return c.FeeBaseMSat + (amt*c.FeeProportionalMillionths)/feeRateParts
}
// ComputeFeeFromIncoming computes the fee to forward an HTLC given the incoming
// amount.
func (c *CachedEdgePolicy) ComputeFeeFromIncoming(
incomingAmt lnwire.MilliSatoshi) lnwire.MilliSatoshi {
return incomingAmt - divideCeil(
feeRateParts*(incomingAmt-c.FeeBaseMSat),
feeRateParts+c.FeeProportionalMillionths,
)
}
// NewCachedPolicy turns a full policy into a minimal one that can be cached.
func NewCachedPolicy(policy *ChannelEdgePolicy) *CachedEdgePolicy {
return &CachedEdgePolicy{

16
channeldb/models/channel_edge_policy.go
View File

@@ -113,19 +113,3 @@ func (c *ChannelEdgePolicy) ComputeFee(
return c.FeeBaseMSat + (amt*c.FeeProportionalMillionths)/feeRateParts
}
// divideCeil divides dividend by factor and rounds the result up.
func divideCeil(dividend, factor lnwire.MilliSatoshi) lnwire.MilliSatoshi {
return (dividend + factor - 1) / factor
}
// ComputeFeeFromIncoming computes the fee to forward an HTLC given the incoming
// amount.
func (c *ChannelEdgePolicy) ComputeFeeFromIncoming(
incomingAmt lnwire.MilliSatoshi) lnwire.MilliSatoshi {
return incomingAmt - divideCeil(
feeRateParts*(incomingAmt-c.FeeBaseMSat),
feeRateParts+c.FeeProportionalMillionths,
)
}