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routing: allow specifying a fee limit during route construction

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This commit is contained in:
Wilmer Paulino
2018-04-19 10:32:24 -04:00
parent 6a6de812ba
commit ddf8f2cb01
6 changed files with 143 additions and 36 deletions
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15
routing/pathfind.go
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@@ -248,9 +248,9 @@ func (r *Route) ToHopPayloads() []sphinx.HopData {
//
// NOTE: The passed slice of ChannelHops MUST be sorted in forward order: from
// the source to the target node of the path finding attempt.
func newRoute(amtToSend lnwire.MilliSatoshi, sourceVertex Vertex,
func newRoute(amtToSend, feeLimit lnwire.MilliSatoshi, sourceVertex Vertex,
pathEdges []*ChannelHop, currentHeight uint32,
finalCLTVDelta uint16, feeLimit btcutil.Amount) (*Route, error) {
finalCLTVDelta uint16) (*Route, error) {
// First, we'll create a new empty route with enough hops to match the
// amount of path edges. We set the TotalTimeLock to the current block
@@ -339,12 +339,11 @@ func newRoute(amtToSend lnwire.MilliSatoshi, sourceVertex Vertex,
route.TotalFees += nextHop.Fee
// If the total fees exceed the fee limit established for this
// payment, stop hopping the route and return
if route.TotalFees.ToSatoshis() > feeLimit {
err := fmt.Sprintf("Route fee exceeded fee limit of %v",
feeLimit)
return nil, newErrf(ErrFeeCutoffExceeded, err)
// Invalidate this route if its total fees exceed our fee limit.
if route.TotalFees > feeLimit {
err := fmt.Sprintf("total route fees exceeded fee "+
"limit of %v", feeLimit)
return nil, newErrf(ErrFeeLimitExceeded, err)
}
// As a sanity check, we ensure that the selected channel has