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routing: add sufficient link capacity to our relaxation condition

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This commit modifies our modified version of Dijkstra's to include
sufficient link capacity within the algorithm’s relaxation condition.
With this change, we’ll now avoid exploring the graph in the direction
of a link that has insufficient capacity, allowing us to terminate path
finding more quickly.
This commit is contained in:
Olaoluwa Osuntokun
2017-03-19 14:11:25 -07:00
parent 606b23df43
commit 20aba8060f
2 changed files with 8 additions and 2 deletions
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4
routing/pathfind.go
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@ -331,7 +331,9 @@ func findRoute(graph *channeldb.ChannelGraph, target *btcec.PublicKey,
// TODO(roasbeef): add capacity to relaxation criteria?
// * also add min payment?
v := newVertex(edge.Node.PubKey)
if tempDist < distance[v].dist {
if tempDist < distance[v].dist &&
edgeInfo.Capacity >= amt {
distance[v] = nodeWithDist{
dist: tempDist,
node: edge.Node,