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routing: swap out final hop blinded route pub keys

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If multiple blinded paths are provided, they will each have a different
pub key for the destination node. This makes using our existing
pathfinding logic tricky since it depends on having a single destination
node (characterised by a single pub key). We want to re-use this logic.
So what we do is swap out the pub keys of the destinaion hop with a
pseudo target pub key. This will then be used during pathfinding. Later
on once a path is found, we will swap the real destination keys back in
so that onion creation can be done.
This commit is contained in:
Elle Mouton
2024-05-15 15:52:17 +02:00
parent 4a22ec8413
commit 8df03de3e9
6 changed files with 99 additions and 42 deletions
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5
routing/pathfind_test.go
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@@ -23,6 +23,7 @@ import (
sphinx "github.com/lightningnetwork/lightning-onion"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/channeldb/models"
"github.com/lightningnetwork/lnd/fn"
"github.com/lightningnetwork/lnd/htlcswitch"
switchhop "github.com/lightningnetwork/lnd/htlcswitch/hop"
"github.com/lightningnetwork/lnd/kvdb"
@@ -3286,7 +3287,9 @@ func TestBlindedRouteConstruction(t *testing.T) {
// that make up the graph we'll give to route construction. The hints
// map is keyed by source node, so we can retrieve our blinded edges
// accordingly.
blindedEdges, err := blindedPayment.toRouteHints()
blindedEdges, err := blindedPayment.toRouteHints(
fn.None[*btcec.PublicKey](),
)
require.NoError(t, err)
carolDaveEdge := blindedEdges[carolVertex][0]