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blindedpath: smarter dummy hop policy selection

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This commit introduces more sophisticated code for selecting dummy hop
policy values for dummy hops in blinded paths.

For the case where the path does contain real hops, the dummy hop policy
values are derived by taking the average of those hop polices. For the
case where there are no real hops (in other words, we are the
introduction node), we use the default policy values used for normal
ChannelUpdates but then for the MaxHTLC value, we take the average of
all our open channel capacities.
This commit is contained in:
Elle Mouton
2024-07-26 11:10:04 +02:00
parent 60a856ab65
commit c490279002
4 changed files with 196 additions and 45 deletions
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25
lnrpc/invoicesrpc/addinvoice.go
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@@ -109,10 +109,15 @@ type AddInvoiceConfig struct {
// appropriate values (like maximum HTLC) by 10%.
BlindedRoutePolicyDecrMultiplier float64
// MinNumHops is the minimum number of hops that a blinded path should
// be. Dummy hops will be used to pad any route with a length less than
// this.
MinNumHops uint8
// MinNumBlindedPathHops is the minimum number of hops that a blinded
// path should be. Dummy hops will be used to pad any route with a
// length less than this.
MinNumBlindedPathHops uint8
// DefaultDummyHopPolicy holds the default policy values to use for
// dummy hops in a blinded path in the case where they cant be derived
// through other means.
DefaultDummyHopPolicy *blindedpath.BlindedHopPolicy
}
// AddInvoiceData contains the required data to create a new invoice.
@@ -508,6 +513,7 @@ func AddInvoice(ctx context.Context, cfg *AddInvoiceConfig,
&blindedpath.BuildBlindedPathCfg{
FindRoutes: cfg.QueryBlindedRoutes,
FetchChannelEdgesByID: cfg.Graph.FetchChannelEdgesByID,
FetchOurOpenChannels: cfg.ChanDB.FetchAllOpenChannels,
PathID: paymentAddr[:],
ValueMsat: invoice.Value,
BestHeight: cfg.BestHeight,
@@ -523,15 +529,8 @@ func AddInvoice(ctx context.Context, cfg *AddInvoiceConfig,
cfg.BlindedRoutePolicyDecrMultiplier,
)
},
MinNumHops: cfg.MinNumHops,
// TODO: make configurable
DummyHopPolicy: &blindedpath.BlindedHopPolicy{
CLTVExpiryDelta: 80,
FeeRate: 100,
BaseFee: 100,
MinHTLCMsat: 0,
MaxHTLCMsat: lnwire.MaxMilliSatoshi,
},
MinNumHops: cfg.MinNumBlindedPathHops,
DefaultDummyHopPolicy: cfg.DefaultDummyHopPolicy,
},
)
if err != nil {