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routing+lnrpc: extend BuildRoute to accept raw payAddr

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In this commit, we extend the `BuildRoute` method and RPC on the router
sub-server to accept a raw payment address which will be included as
part of an MPP payload for the finla hop. This change actually also
allows users to craft their own MPP paths using BuildRoute+SendToRoute.
Our primary goal however, was to fix some broken itests since we now
require the payAddr to be present for ALL payments other than key send
payments.
This commit is contained in:
Olaoluwa Osuntokun 2020-11-23 20:17:16 -08:00
parent 530059f18b
commit d996607470
No known key found for this signature in database
GPG Key ID: 3BBD59E99B280306
7 changed files with 272 additions and 201 deletions
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338
lnrpc/routerrpc/router.pb.go
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@ -1143,7 +1143,9 @@ type BuildRouteRequest struct {
// //
//A list of hops that defines the route. This does not include the source hop //A list of hops that defines the route. This does not include the source hop
//pubkey. //pubkey.
HopPubkeys [][]byte `protobuf:"bytes,4,rep,name=hop_pubkeys,json=hopPubkeys,proto3" json:"hop_pubkeys,omitempty"` HopPubkeys [][]byte `protobuf:"bytes,4,rep,name=hop_pubkeys,json=hopPubkeys,proto3" json:"hop_pubkeys,omitempty"`
// An optional payment addr to be included within the last hop of the route.
PaymentAddr []byte `protobuf:"bytes,5,opt,name=payment_addr,json=paymentAddr,proto3" json:"payment_addr,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"` XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"` XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"` XXX_sizecache int32 `json:"-"`
@ -1202,6 +1204,13 @@ func (m *BuildRouteRequest) GetHopPubkeys() [][]byte {
return nil return nil
} }
func (m *BuildRouteRequest) GetPaymentAddr() []byte {
if m != nil {
return m.PaymentAddr
}
return nil
}
type BuildRouteResponse struct { type BuildRouteResponse struct {
// //
//Fully specified route that can be used to execute the payment. //Fully specified route that can be used to execute the payment.
@ -2028,170 +2037,171 @@ func init() {
func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) } func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
var fileDescriptor_7a0613f69d37b0a5 = []byte{ var fileDescriptor_7a0613f69d37b0a5 = []byte{
// 2601 bytes of a gzipped FileDescriptorProto // 2615 bytes of a gzipped FileDescriptorProto
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} }
// Reference imports to suppress errors if they are not otherwise used. // Reference imports to suppress errors if they are not otherwise used.

3
lnrpc/routerrpc/router.proto
View File

@ -394,6 +394,9 @@ message BuildRouteRequest {
pubkey. pubkey.
*/ */
repeated bytes hop_pubkeys = 4; repeated bytes hop_pubkeys = 4;
// An optional payment addr to be included within the last hop of the route.
bytes payment_addr = 5;
} }
message BuildRouteResponse { message BuildRouteResponse {

5
lnrpc/routerrpc/router.swagger.json
View File

@ -832,6 +832,11 @@
"format": "byte" "format": "byte"
}, },
"description": "A list of hops that defines the route. This does not include the source hop\npubkey." "description": "A list of hops that defines the route. This does not include the source hop\npubkey."
},
"payment_addr": {
"type": "string",
"format": "byte",
"description": "An optional payment addr to be included within the last hop of the route."
} }
} }
}, },

10
lnrpc/routerrpc/router_server.go
View File

@ -564,9 +564,17 @@ func (s *Server) BuildRoute(ctx context.Context,
outgoingChan = &req.OutgoingChanId outgoingChan = &req.OutgoingChanId
} }
var payAddr *[32]byte
if len(req.PaymentAddr) != 0 {
var backingPayAddr [32]byte
copy(backingPayAddr[:], req.PaymentAddr)
payAddr = &backingPayAddr
}
// Build the route and return it to the caller. // Build the route and return it to the caller.
route, err := s.cfg.Router.BuildRoute( route, err := s.cfg.Router.BuildRoute(
amt, hops, outgoingChan, req.FinalCltvDelta, amt, hops, outgoingChan, req.FinalCltvDelta, payAddr,
) )
if err != nil { if err != nil {
return nil, err return nil, err

43
lntest/itest/lnd_forward_interceptor_test.go
View File

@ -27,6 +27,7 @@ var (
type interceptorTestCase struct { type interceptorTestCase struct {
amountMsat int64 amountMsat int64
payAddr []byte
invoice *lnrpc.Invoice invoice *lnrpc.Invoice
shouldHold bool shouldHold bool
interceptorAction routerrpc.ResolveHoldForwardAction interceptorAction routerrpc.ResolveHoldForwardAction
@ -105,7 +106,9 @@ func testForwardInterceptor(net *lntest.NetworkHarness, t *harnessTest) {
defer wg.Done() defer wg.Done()
for _, tc := range testCases { for _, tc := range testCases {
attempt, err := testContext.sendAliceToCarolPayment( attempt, err := testContext.sendAliceToCarolPayment(
context.Background(), tc.invoice.ValueMsat, tc.invoice.RHash) context.Background(), tc.invoice.ValueMsat,
tc.invoice.RHash, tc.payAddr,
)
if t.t.Failed() { if t.t.Failed() {
return return
@ -118,7 +121,8 @@ func testForwardInterceptor(net *lntest.NetworkHarness, t *harnessTest) {
// For 'fail' interceptor action we make sure the payment failed. // For 'fail' interceptor action we make sure the payment failed.
case routerrpc.ResolveHoldForwardAction_FAIL: case routerrpc.ResolveHoldForwardAction_FAIL:
if attempt.Status != lnrpc.HTLCAttempt_FAILED { if attempt.Status != lnrpc.HTLCAttempt_FAILED {
t.t.Errorf("expected payment to fail, instead got %v", attempt.Status) t.t.Errorf("expected payment to fail, "+
"instead got %v", attempt.Status)
} }
// For settle and resume we make sure the payment is successful. // For settle and resume we make sure the payment is successful.
@ -127,7 +131,8 @@ func testForwardInterceptor(net *lntest.NetworkHarness, t *harnessTest) {
case routerrpc.ResolveHoldForwardAction_RESUME: case routerrpc.ResolveHoldForwardAction_RESUME:
if attempt.Status != lnrpc.HTLCAttempt_SUCCEEDED { if attempt.Status != lnrpc.HTLCAttempt_SUCCEEDED {
t.t.Errorf("expected payment to succeed, instead got %v", attempt.Status) t.t.Errorf("expected payment to "+
"succeed, instead got %v", attempt.Status)
} }
} }
} }
@ -202,7 +207,9 @@ func testForwardInterceptor(net *lntest.NetworkHarness, t *harnessTest) {
foundPayment.Status != lnrpc.Payment_IN_FLIGHT { foundPayment.Status != lnrpc.Payment_IN_FLIGHT {
t.Fatalf("expected to find in flight payment for"+ t.Fatalf("expected to find in flight payment for"+
"amount %v, %v", testCase.invoice.ValueMsat, foundPayment.Status) "amount %v, %v",
testCase.invoice.ValueMsat,
foundPayment.Status)
} }
} }
} }
@ -294,12 +301,25 @@ func (c *interceptorTestContext) prepareTestCases() (
if err != nil { if err != nil {
return nil, fmt.Errorf("unable to add invoice: %v", err) return nil, fmt.Errorf("unable to add invoice: %v", err)
} }
// We'll need to also decode the returned invoice so we can
// grab the payment address which is now required for ALL
// payments.
payReq, err := c.carol.DecodePayReq(context.Background(), &lnrpc.PayReqString{
PayReq: invoice.PaymentRequest,
})
if err != nil {
return nil, fmt.Errorf("unable to decode invoice: %v", err)
}
t.invoice = invoice t.invoice = invoice
t.payAddr = payReq.PaymentAddr
} }
return cases, nil return cases, nil
} }
func (c *interceptorTestContext) openChannel(from, to *lntest.HarnessNode, chanSize btcutil.Amount) { func (c *interceptorTestContext) openChannel(from, to *lntest.HarnessNode,
chanSize btcutil.Amount) {
ctxb := context.Background() ctxb := context.Background()
ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
@ -365,10 +385,14 @@ func (c *interceptorTestContext) waitForChannels() {
// sendAliceToCarolPayment sends a payment from alice to carol and make an // sendAliceToCarolPayment sends a payment from alice to carol and make an
// attempt to pay. The lnrpc.HTLCAttempt is returned. // attempt to pay. The lnrpc.HTLCAttempt is returned.
func (c *interceptorTestContext) sendAliceToCarolPayment(ctx context.Context, func (c *interceptorTestContext) sendAliceToCarolPayment(ctx context.Context,
amtMsat int64, paymentHash []byte) (*lnrpc.HTLCAttempt, error) { amtMsat int64,
paymentHash, paymentAddr []byte) (*lnrpc.HTLCAttempt, error) {
// Build a route from alice to carol. // Build a route from alice to carol.
route, err := c.buildRoute(ctx, amtMsat, []*lntest.HarnessNode{c.bob, c.carol}) route, err := c.buildRoute(
ctx, amtMsat, []*lntest.HarnessNode{c.bob, c.carol},
paymentAddr,
)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -387,8 +411,8 @@ func (c *interceptorTestContext) sendAliceToCarolPayment(ctx context.Context,
} }
// buildRoute is a helper function to build a route with given hops. // buildRoute is a helper function to build a route with given hops.
func (c *interceptorTestContext) buildRoute(ctx context.Context, amtMsat int64, hops []*lntest.HarnessNode) ( func (c *interceptorTestContext) buildRoute(ctx context.Context, amtMsat int64,
*lnrpc.Route, error) { hops []*lntest.HarnessNode, payAddr []byte) (*lnrpc.Route, error) {
rpcHops := make([][]byte, 0, len(hops)) rpcHops := make([][]byte, 0, len(hops))
for _, hop := range hops { for _, hop := range hops {
@ -405,6 +429,7 @@ func (c *interceptorTestContext) buildRoute(ctx context.Context, amtMsat int64,
AmtMsat: amtMsat, AmtMsat: amtMsat,
FinalCltvDelta: chainreg.DefaultBitcoinTimeLockDelta, FinalCltvDelta: chainreg.DefaultBitcoinTimeLockDelta,
HopPubkeys: rpcHops, HopPubkeys: rpcHops,
PaymentAddr: payAddr,
} }
routeResp, err := c.alice.RouterClient.BuildRoute(ctx, req) routeResp, err := c.alice.RouterClient.BuildRoute(ctx, req)

11
routing/router.go
View File

@ -2432,7 +2432,7 @@ func (e ErrNoChannel) Error() string {
// outgoing channel, use the outgoingChan parameter. // outgoing channel, use the outgoingChan parameter.
func (r *ChannelRouter) BuildRoute(amt *lnwire.MilliSatoshi, func (r *ChannelRouter) BuildRoute(amt *lnwire.MilliSatoshi,
hops []route.Vertex, outgoingChan *uint64, hops []route.Vertex, outgoingChan *uint64,
finalCltvDelta int32) (*route.Route, error) { finalCltvDelta int32, payAddr *[32]byte) (*route.Route, error) {
log.Tracef("BuildRoute called: hopsCount=%v, amt=%v", log.Tracef("BuildRoute called: hopsCount=%v, amt=%v",
len(hops), amt) len(hops), amt)
@ -2582,10 +2582,11 @@ func (r *ChannelRouter) BuildRoute(amt *lnwire.MilliSatoshi,
return newRoute( return newRoute(
source, pathEdges, uint32(height), source, pathEdges, uint32(height),
finalHopParams{ finalHopParams{
amt: receiverAmt, amt: receiverAmt,
totalAmt: receiverAmt, totalAmt: receiverAmt,
cltvDelta: uint16(finalCltvDelta), cltvDelta: uint16(finalCltvDelta),
records: nil, records: nil,
paymentAddr: payAddr,
}, },
) )
} }

63
routing/router_test.go
View File

@ -15,6 +15,7 @@ import (
"github.com/btcsuite/btcd/wire" "github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil" "github.com/btcsuite/btcutil"
"github.com/davecgh/go-spew/spew" "github.com/davecgh/go-spew/spew"
"github.com/stretchr/testify/require"
"github.com/lightningnetwork/lnd/channeldb" "github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/clock" "github.com/lightningnetwork/lnd/clock"
@ -2921,6 +2922,10 @@ func TestSendToRouteMaxHops(t *testing.T) {
func TestBuildRoute(t *testing.T) { func TestBuildRoute(t *testing.T) {
// Setup a three node network. // Setup a three node network.
chanCapSat := btcutil.Amount(100000) chanCapSat := btcutil.Amount(100000)
paymentAddrFeatures := lnwire.NewFeatureVector(
lnwire.NewRawFeatureVector(lnwire.PaymentAddrOptional),
lnwire.Features,
)
testChannels := []*testChannel{ testChannels := []*testChannel{
// Create two local channels from a. The bandwidth is estimated // Create two local channels from a. The bandwidth is estimated
// in this test as the channel capacity. For building routes, we // in this test as the channel capacity. For building routes, we
@ -2945,29 +2950,33 @@ func TestBuildRoute(t *testing.T) {
// nodes are recommended to keep their channel policies towards // nodes are recommended to keep their channel policies towards
// the same peer identical. // the same peer identical.
symmetricTestChannel("b", "c", chanCapSat, &testChannelPolicy{ symmetricTestChannel("b", "c", chanCapSat, &testChannelPolicy{
Expiry: 144, Expiry: 144,
FeeRate: 50000, FeeRate: 50000,
MinHTLC: lnwire.NewMSatFromSatoshis(20), MinHTLC: lnwire.NewMSatFromSatoshis(20),
MaxHTLC: lnwire.NewMSatFromSatoshis(120), MaxHTLC: lnwire.NewMSatFromSatoshis(120),
Features: paymentAddrFeatures,
}, 2), }, 2),
symmetricTestChannel("b", "c", chanCapSat, &testChannelPolicy{ symmetricTestChannel("b", "c", chanCapSat, &testChannelPolicy{
Expiry: 144, Expiry: 144,
FeeRate: 60000, FeeRate: 60000,
MinHTLC: lnwire.NewMSatFromSatoshis(20), MinHTLC: lnwire.NewMSatFromSatoshis(20),
MaxHTLC: lnwire.NewMSatFromSatoshis(120), MaxHTLC: lnwire.NewMSatFromSatoshis(120),
Features: paymentAddrFeatures,
}, 7), }, 7),
symmetricTestChannel("a", "e", chanCapSat, &testChannelPolicy{ symmetricTestChannel("a", "e", chanCapSat, &testChannelPolicy{
Expiry: 144, Expiry: 144,
FeeRate: 80000, FeeRate: 80000,
MinHTLC: lnwire.NewMSatFromSatoshis(5), MinHTLC: lnwire.NewMSatFromSatoshis(5),
MaxHTLC: lnwire.NewMSatFromSatoshis(10), MaxHTLC: lnwire.NewMSatFromSatoshis(10),
Features: paymentAddrFeatures,
}, 5), }, 5),
symmetricTestChannel("e", "c", chanCapSat, &testChannelPolicy{ symmetricTestChannel("e", "c", chanCapSat, &testChannelPolicy{
Expiry: 144, Expiry: 144,
FeeRate: 100000, FeeRate: 100000,
MinHTLC: lnwire.NewMSatFromSatoshis(20), MinHTLC: lnwire.NewMSatFromSatoshis(20),
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat), MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
Features: paymentAddrFeatures,
}, 4), }, 4),
} }
@ -2987,7 +2996,9 @@ func TestBuildRoute(t *testing.T) {
} }
defer cleanUp() defer cleanUp()
checkHops := func(rt *route.Route, expected []uint64) { checkHops := func(rt *route.Route, expected []uint64,
payAddr [32]byte) {
t.Helper() t.Helper()
if len(rt.Hops) != len(expected) { if len(rt.Hops) != len(expected) {
@ -3000,8 +3011,16 @@ func TestBuildRoute(t *testing.T) {
expected[i], i, hop.ChannelID) expected[i], i, hop.ChannelID)
} }
} }
lastHop := rt.Hops[len(rt.Hops)-1]
require.NotNil(t, lastHop.MPP)
require.Equal(t, lastHop.MPP.PaymentAddr(), payAddr)
} }
var payAddr [32]byte
_, err = rand.Read(payAddr[:])
require.NoError(t, err)
// Create hop list from the route node pubkeys. // Create hop list from the route node pubkeys.
hops := []route.Vertex{ hops := []route.Vertex{
ctx.aliases["b"], ctx.aliases["c"], ctx.aliases["b"], ctx.aliases["c"],
@ -3010,7 +3029,7 @@ func TestBuildRoute(t *testing.T) {
// Build the route for the given amount. // Build the route for the given amount.
rt, err := ctx.router.BuildRoute( rt, err := ctx.router.BuildRoute(
&amt, hops, nil, 40, &amt, hops, nil, 40, &payAddr,
) )
if err != nil { if err != nil {
t.Fatal(err) t.Fatal(err)
@ -3019,14 +3038,14 @@ func TestBuildRoute(t *testing.T) {
// Check that we get the expected route back. The total amount should be // Check that we get the expected route back. The total amount should be
// the amount to deliver to hop c (100 sats) plus the max fee for the // the amount to deliver to hop c (100 sats) plus the max fee for the
// connection b->c (6 sats). // connection b->c (6 sats).
checkHops(rt, []uint64{1, 7}) checkHops(rt, []uint64{1, 7}, payAddr)
if rt.TotalAmount != 106000 { if rt.TotalAmount != 106000 {
t.Fatalf("unexpected total amount %v", rt.TotalAmount) t.Fatalf("unexpected total amount %v", rt.TotalAmount)
} }
// Build the route for the minimum amount. // Build the route for the minimum amount.
rt, err = ctx.router.BuildRoute( rt, err = ctx.router.BuildRoute(
nil, hops, nil, 40, nil, hops, nil, 40, &payAddr,
) )
if err != nil { if err != nil {
t.Fatal(err) t.Fatal(err)
@ -3036,7 +3055,7 @@ func TestBuildRoute(t *testing.T) {
// send from b to c is 20 sats. Hop b charges 1200 msat for the // send from b to c is 20 sats. Hop b charges 1200 msat for the
// forwarding. The channel between hop a and b can carry amounts in the // forwarding. The channel between hop a and b can carry amounts in the
// range [5, 100], so 21200 msats is the minimum amount for this route. // range [5, 100], so 21200 msats is the minimum amount for this route.
checkHops(rt, []uint64{1, 7}) checkHops(rt, []uint64{1, 7}, payAddr)
if rt.TotalAmount != 21200 { if rt.TotalAmount != 21200 {
t.Fatalf("unexpected total amount %v", rt.TotalAmount) t.Fatalf("unexpected total amount %v", rt.TotalAmount)
} }
@ -3047,7 +3066,7 @@ func TestBuildRoute(t *testing.T) {
ctx.aliases["e"], ctx.aliases["c"], ctx.aliases["e"], ctx.aliases["c"],
} }
_, err = ctx.router.BuildRoute( _, err = ctx.router.BuildRoute(
nil, hops, nil, 40, nil, hops, nil, 40, nil,
) )
errNoChannel, ok := err.(ErrNoChannel) errNoChannel, ok := err.(ErrNoChannel)
if !ok { if !ok {