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routing: extend path finding to be TLV-EOB aware, allow dest TLV records

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In this commit, we extend the path finding to be able to recognize when
a node needs the new TLV format, or the legacy format based on the
feature bits they expose. We also extend the `LightningPayment` struct
to allow the caller to specify an arbitrary set of TLV records which can
be used for a number of use-cases including various variants of
spontaneous payments.
This commit is contained in:
Olaoluwa Osuntokun
2019-07-30 21:41:58 -07:00
parent 5b4c8ac232
commit 4697cfde30
9 changed files with 158 additions and 50 deletions
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11
routing/router.go
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@ -26,6 +26,7 @@ import (
"github.com/lightningnetwork/lnd/routing/chainview"
"github.com/lightningnetwork/lnd/routing/route"
"github.com/lightningnetwork/lnd/ticker"
"github.com/lightningnetwork/lnd/tlv"
"github.com/lightningnetwork/lnd/zpay32"
)
@ -1429,6 +1430,7 @@ type routingMsg struct {
// factoring in channel capacities and cumulative fees along the route.
func (r *ChannelRouter) FindRoute(source, target route.Vertex,
amt lnwire.MilliSatoshi, restrictions *RestrictParams,
destTlvRecords []tlv.Record,
finalExpiry ...uint16) (*route.Route, error) {
var finalCLTVDelta uint16
@ -1482,6 +1484,7 @@ func (r *ChannelRouter) FindRoute(source, target route.Vertex,
// Create the route with absolute time lock values.
route, err := newRoute(
amt, source, path, uint32(currentHeight), finalCLTVDelta,
destTlvRecords,
)
if err != nil {
return nil, err
@ -1630,7 +1633,11 @@ type LightningPayment struct {
// attempting to complete.
PaymentRequest []byte
// TODO(roasbeef): add e2e message?
// FinalDestRecords are TLV records that are to be sent to the final
// hop in the new onion payload format. If the destination does not
// understand this new onion payload format, then the payment will
// fail.
FinalDestRecords []tlv.Record
}
// SendPayment attempts to send a payment as described within the passed
@ -1694,6 +1701,8 @@ func (r *ChannelRouter) preparePayment(payment *LightningPayment) (
// Record this payment hash with the ControlTower, ensuring it is not
// already in-flight.
//
// TODO(roasbeef): store records as part of creation info?
info := &channeldb.PaymentCreationInfo{
PaymentHash: payment.PaymentHash,
Value: payment.Amount,