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loopin: generate route hints correctly if last hop is set #945

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loopin: generate route hints correctly if last hop is set #945

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25 changes: 14 additions & 11 deletions loopin.go
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Original file line number Diff line number Diff line change
Expand Up @@ -103,17 +103,20 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig,
return nil, fmt.Errorf("private and route_hints both set")
}

// If Private is set, we generate route hints.
if request.Private {
// If last_hop is set, we'll only add channels with peers set to
// the last_hop parameter.
includeNodes := make(map[route.Vertex]struct{})
if request.LastHop != nil {
includeNodes[*request.LastHop] = struct{}{}
}

// Because the Private flag is set, we'll generate our own set
// of hop hints.
// If last_hop is set, we'll only add channels with peers set to
// the last_hop parameter.
includeNodes := make(map[route.Vertex]struct{})
if request.LastHop != nil {
includeNodes[*request.LastHop] = struct{}{}
}

// SelectHopHints is used to generate route hints for the swap and probe
// invoices. If the user has set the last_hop parameter, we will only
// add channels with the peer set to the last_hop parameter. If the user
// has requested a private swap, we'll use the intersection of the last
// hop and the private channels of the node. If the user only requested
// private channels, we'll select from all private channels of the node.
if request.Private || request.LastHop != nil {
request.RouteHints, err = SelectHopHints(
globalCtx, cfg.lnd.Client, request.Amount,
DefaultMaxHopHints, includeNodes,
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