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routing/payment_session: make RequestRoute take max amt, fee limit and

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active shards

In preparation for doing pathfinding for routes sending a value less
than the total payment amount, we let the payment session take the max
amount to send and the fee limit as arguments to RequestRoute.
This commit is contained in:
Johan T. Halseth
2020-04-01 00:13:22 +02:00
parent f9eeb6b41f
commit 00903ef9f5
5 changed files with 44 additions and 16 deletions
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19
routing/payment_session.go
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@@ -23,8 +23,14 @@ var (
// information learned during the previous attempts.
type PaymentSession interface {
// RequestRoute returns the next route to attempt for routing the
// specified HTLC payment to the target node.
RequestRoute(height uint32) (*route.Route, error)
// specified HTLC payment to the target node. The returned route should
// carry at most maxAmt to the target node, and pay at most feeLimit in
// fees. It can carry less if the payment is MPP. The activeShards
// argument should be set to instruct the payment session about the
// number of in flight HTLCS for the payment, such that it can choose
// splitting strategy accordingly.
RequestRoute(maxAmt, feeLimit lnwire.MilliSatoshi,
activeShards, height uint32) (*route.Route, error)
}
// paymentSession is used during an HTLC routings session to prune the local
@@ -59,7 +65,8 @@ type paymentSession struct {
//
// NOTE: This function is safe for concurrent access.
// NOTE: Part of the PaymentSession interface.
func (p *paymentSession) RequestRoute(height uint32) (*route.Route, error) {
func (p *paymentSession) RequestRoute(maxAmt, feeLimit lnwire.MilliSatoshi,
activeShards, height uint32) (*route.Route, error) {
switch {
@@ -94,7 +101,7 @@ func (p *paymentSession) RequestRoute(height uint32) (*route.Route, error) {
restrictions := &RestrictParams{
ProbabilitySource: ss.MissionControl.GetProbability,
FeeLimit: p.payment.FeeLimit,
FeeLimit: feeLimit,
OutgoingChannelID: p.payment.OutgoingChannelID,
LastHop: p.payment.LastHop,
CltvLimit: cltvLimit,
@@ -124,7 +131,7 @@ func (p *paymentSession) RequestRoute(height uint32) (*route.Route, error) {
},
restrictions, &ss.PathFindingConfig,
ss.SelfNode.PubKeyBytes, p.payment.Target,
p.payment.Amount, finalHtlcExpiry,
maxAmt, finalHtlcExpiry,
)
if err != nil {
return nil, err
@@ -136,7 +143,7 @@ func (p *paymentSession) RequestRoute(height uint32) (*route.Route, error) {
route, err := newRoute(
sourceVertex, path, height,
finalHopParams{
amt: p.payment.Amount,
amt: maxAmt,
cltvDelta: finalCltvDelta,
records: p.payment.DestCustomRecords,
paymentAddr: p.payment.PaymentAddr,