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routing: adding the BlockPadding value to sendpayment

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This commit adds the BlockPadding value (currently 3) to sendpayment
calls so that if some blocks are mined while the htlc is in-flight, the
exit hop won't reject it.
This commit is contained in:
nsa 2019-07-23 20:59:31 -04:00
parent 4e8fb4d32b
commit 3dde7bc4e2
1 changed files with 8 additions and 0 deletions
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8
routing/payment_session.go
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@ -8,6 +8,10 @@ import (
"github.com/lightningnetwork/lnd/routing/route" "github.com/lightningnetwork/lnd/routing/route"
) )
// BlockPadding is used to increment the finalCltvDelta value for the last hop
// to prevent an HTLC being failed if some blocks are mined while it's in-flight.
const BlockPadding uint16 = 3
// PaymentSession is used during SendPayment attempts to provide routes to // PaymentSession is used during SendPayment attempts to provide routes to
// attempt. It also defines methods to give the PaymentSession additional // attempt. It also defines methods to give the PaymentSession additional
// information learned during the previous attempts. // information learned during the previous attempts.
@ -65,6 +69,10 @@ func (p *paymentSession) RequestRoute(payment *LightningPayment,
return nil, fmt.Errorf("pre-built route already tried") return nil, fmt.Errorf("pre-built route already tried")
} }
// Add BlockPadding to the finalCltvDelta so that the receiving node
// does not reject the HTLC if some blocks are mined while it's in-flight.
finalCltvDelta += BlockPadding
// If a route cltv limit was specified, we need to subtract the final // If a route cltv limit was specified, we need to subtract the final
// delta before passing it into path finding. The optimal path is // delta before passing it into path finding. The optimal path is
// independent of the final cltv delta and the path finding algorithm is // independent of the final cltv delta and the path finding algorithm is