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routing: add incoming channel chain to blinded paths

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In this commit, the blindedPathRestrictions are expanded to include a
list of incoming channels that must be included in any blinded path. The
unit tests are expanded to test this new logic.
This commit is contained in:
MPins
2025-05-13 16:27:41 -03:00
parent b0cba7dd08
commit f541c442cf
3 changed files with 186 additions and 14 deletions
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14
routing/router.go
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@@ -610,6 +610,11 @@ type BlindedPathRestrictions struct {
// NodeOmissionSet is a set of nodes that should not be used within any
// of the blinded paths that we generate.
NodeOmissionSet fn.Set[route.Vertex]
// IncomingChainedChannels holds the chained channels list (specified
// via channel id) starting from a channel which points to the receiver
// node.
IncomingChainedChannels []uint64
}
// FindBlindedPaths finds a selection of paths to the destination node that can
@@ -620,11 +625,14 @@ func (r *ChannelRouter) FindBlindedPaths(destination route.Vertex,
// First, find a set of candidate paths given the destination node and
// path length restrictions.
incomingChainedChannels := restrictions.IncomingChainedChannels
minDistanceFromIntroNode := restrictions.MinDistanceFromIntroNode
paths, err := findBlindedPaths(
r.cfg.RoutingGraph, destination, &blindedPathRestrictions{
minNumHops: restrictions.MinDistanceFromIntroNode,
maxNumHops: restrictions.NumHops,
nodeOmissionSet: restrictions.NodeOmissionSet,
minNumHops: minDistanceFromIntroNode,
maxNumHops: restrictions.NumHops,
nodeOmissionSet: restrictions.NodeOmissionSet,
incomingChainedChannels: incomingChainedChannels,
},
)
if err != nil {