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channeldb+routing: expose HTLCs in payment subscriptions

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This commit modifies the FetchPayment method to return MPPayment structs
converted from the legacy on-disk format. This allows us to attach the
HTLCs to the events given to clients subscribing to the outcome of an
HTLC.

This commit also bubbles up to the routerrpc/router_server, by
populating HTLCAttempts in the response and extracting the legacy route
field from the HTLCAttempts.
This commit is contained in:
Conner Fromknecht 2019-11-08 03:39:51 -08:00
parent 68916eb4b7
commit 063f24f2ed
No known key found for this signature in database
GPG Key ID: E7D737B67FA592C7
6 changed files with 143 additions and 86 deletions
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36
channeldb/payment_control.go
View File

@ -8,7 +8,6 @@ import (
"github.com/coreos/bbolt"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/routing/route"
)
var (
@ -192,16 +191,17 @@ func (p *PaymentControl) RegisterAttempt(paymentHash lntypes.Hash,
// duplicate payments to the same payment hash. The provided preimage is
// atomically saved to the DB for record keeping.
func (p *PaymentControl) Success(paymentHash lntypes.Hash,
preimage lntypes.Preimage) (*route.Route, error) {
preimage lntypes.Preimage) (*MPPayment, error) {
var (
updateErr error
route *route.Route
payment *MPPayment
)
err := p.db.Batch(func(tx *bbolt.Tx) error {
// Reset the update error, to avoid carrying over an error
// from a previous execution of the batched db transaction.
updateErr = nil
payment = nil
bucket, err := fetchPaymentBucket(tx, paymentHash)
if err == ErrPaymentNotInitiated {
@ -225,20 +225,14 @@ func (p *PaymentControl) Success(paymentHash lntypes.Hash,
}
// Retrieve attempt info for the notification.
attempt, err := fetchPaymentAttempt(bucket)
if err != nil {
payment, err = fetchPayment(bucket)
return err
}
route = &attempt.Route
return nil
})
if err != nil {
return nil, err
}
return route, updateErr
return payment, updateErr
}
// Fail transitions a payment into the Failed state, and records the reason the
@ -246,16 +240,17 @@ func (p *PaymentControl) Success(paymentHash lntypes.Hash,
// its next call for this payment hash, allowing the switch to make a
// subsequent payment.
func (p *PaymentControl) Fail(paymentHash lntypes.Hash,
reason FailureReason) (*route.Route, error) {
reason FailureReason) (*MPPayment, error) {
var (
updateErr error
route *route.Route
payment *MPPayment
)
err := p.db.Batch(func(tx *bbolt.Tx) error {
// Reset the update error, to avoid carrying over an error
// from a previous execution of the batched db transaction.
updateErr = nil
payment = nil
bucket, err := fetchPaymentBucket(tx, paymentHash)
if err == ErrPaymentNotInitiated {
@ -279,28 +274,21 @@ func (p *PaymentControl) Fail(paymentHash lntypes.Hash,
}
// Retrieve attempt info for the notification, if available.
attempt, err := fetchPaymentAttempt(bucket)
if err != nil && err != errNoAttemptInfo {
payment, err = fetchPayment(bucket)
return err
}
if err != errNoAttemptInfo {
route = &attempt.Route
}
return nil
})
if err != nil {
return nil, err
}
return route, updateErr
return payment, updateErr
}
// FetchPayment returns information about a payment from the database.
func (p *PaymentControl) FetchPayment(paymentHash lntypes.Hash) (
*Payment, error) {
*MPPayment, error) {
var payment *Payment
var payment *MPPayment
err := p.db.View(func(tx *bbolt.Tx) error {
bucket, err := fetchPaymentBucket(tx, paymentHash)
if err != nil {

15
channeldb/payment_control_test.go
View File

@ -14,7 +14,6 @@ import (
"github.com/coreos/bbolt"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/routing/route"
)
func initDB() (*DB, error) {
@ -132,16 +131,22 @@ func TestPaymentControlSwitchFail(t *testing.T) {
)
// Verifies that status was changed to StatusSucceeded.
var route *route.Route
route, err = pControl.Success(info.PaymentHash, preimg)
var payment *MPPayment
payment, err = pControl.Success(info.PaymentHash, preimg)
if err != nil {
t.Fatalf("error shouldn't have been received, got: %v", err)
}
err = assertRouteEqual(route, &attempt.Route)
if len(payment.HTLCs) != 1 {
t.Fatalf("payment should have one htlc, got: %d",
len(payment.HTLCs))
}
err = assertRouteEqual(&payment.HTLCs[0].Route, &attempt.Route)
if err != nil {
t.Fatalf("unexpected route returned: %v vs %v: %v",
spew.Sdump(attempt.Route), spew.Sdump(*route), err)
spew.Sdump(attempt.Route),
spew.Sdump(payment.HTLCs[0].Route), err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusSucceeded)

8
channeldb/payments.go
View File

@ -337,7 +337,7 @@ func (db *DB) FetchPayments() ([]*MPPayment, error) {
return err
}
payments = append(payments, p.ToMPPayment())
payments = append(payments, p)
// For older versions of lnd, duplicate payments to a
// payment has was possible. These will be found in a
@ -362,7 +362,7 @@ func (db *DB) FetchPayments() ([]*MPPayment, error) {
return err
}
payments = append(payments, p.ToMPPayment())
payments = append(payments, p)
return nil
})
})
@ -379,7 +379,7 @@ func (db *DB) FetchPayments() ([]*MPPayment, error) {
return payments, nil
}
func fetchPayment(bucket *bbolt.Bucket) (*Payment, error) {
func fetchPayment(bucket *bbolt.Bucket) (*MPPayment, error) {
var (
err error
p = &Payment{}
@ -434,7 +434,7 @@ func fetchPayment(bucket *bbolt.Bucket) (*Payment, error) {
p.Failure = &reason
}
return p, nil
return p.ToMPPayment(), nil
}
// DeletePayments deletes all completed and failed payments from the DB.

49
lnrpc/routerrpc/router_server.go
View File

@ -584,19 +584,12 @@ func (s *Server) trackPayment(paymentHash lntypes.Hash,
case result := <-resultChan:
// Marshall result to rpc type.
var status PaymentStatus
if result.Success {
log.Debugf("Payment %v successfully completed",
paymentHash)
status.State = PaymentState_SUCCEEDED
status.Preimage = result.Preimage[:]
status.Route, err = router.MarshallRoute(
result.Route,
)
if err != nil {
return err
}
} else {
state, err := marshallFailureReason(
result.FailureReason,
@ -605,16 +598,50 @@ func (s *Server) trackPayment(paymentHash lntypes.Hash,
return err
}
status.State = state
if result.Route != nil {
status.Route, err = router.MarshallRoute(
result.Route,
)
}
// Extract the last route from the given list of HTLCs. This
// will populate the legacy route field for backwards
// compatibility.
//
// NOTE: For now there will be at most one HTLC, this code
// should be revisted or the field removed when multiple HTLCs
// are permitted.
var legacyRoute *route.Route
for _, htlc := range result.HTLCs {
switch {
case htlc.Settle != nil:
legacyRoute = &htlc.Route
// Only display the route for failed payments if we got
// an incorrect payment details error, so that it can be
// used for probing or fee estimation.
case htlc.Failure != nil && result.FailureReason ==
channeldb.FailureReasonPaymentDetails:
legacyRoute = &htlc.Route
}
}
if legacyRoute != nil {
status.Route, err = router.MarshallRoute(legacyRoute)
if err != nil {
return err
}
}
// Marshal our list of HTLCs that have been tried for this
// payment.
htlcs := make([]*lnrpc.HTLCAttempt, 0, len(result.HTLCs))
for _, dbHtlc := range result.HTLCs {
htlc, err := router.MarshalHTLCAttempt(dbHtlc)
if err != nil {
return err
}
htlcs = append(htlcs, htlc)
}
status.Htlcs = htlcs
// Send event to the client.
err = stream.Send(&status)
if err != nil {

55
routing/control_tower.go
View File

@ -6,7 +6,6 @@ import (
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/routing/route"
)
// ControlTower tracks all outgoing payments made, whose primary purpose is to
@ -52,10 +51,6 @@ type PaymentResult struct {
// Success indicates whether the payment was successful.
Success bool
// Route is the (last) route attempted to send the HTLC. It is only set
// for successful payments.
Route *route.Route
// Preimage is the preimage of a successful payment. This serves as a
// proof of payment. It is only set for successful payments.
Preimage lntypes.Preimage
@ -63,6 +58,10 @@ type PaymentResult struct {
// FailureReason is a failure reason code indicating the reason the
// payment failed. It is only set for failed payments.
FailureReason channeldb.FailureReason
// HTLCs is a list of HTLCs that have been attempted in order to settle
// the payment.
HTLCs []channeldb.HTLCAttempt
}
// controlTower is persistent implementation of ControlTower to restrict
@ -107,46 +106,46 @@ func (p *controlTower) RegisterAttempt(paymentHash lntypes.Hash,
func (p *controlTower) Success(paymentHash lntypes.Hash,
preimage lntypes.Preimage) error {
route, err := p.db.Success(paymentHash, preimage)
payment, err := p.db.Success(paymentHash, preimage)
if err != nil {
return err
}
// Notify subscribers of success event.
p.notifyFinalEvent(
paymentHash, createSuccessResult(route, preimage),
paymentHash, createSuccessResult(payment.HTLCs),
)
return nil
}
// createSuccessResult creates a success result to send to subscribers.
func createSuccessResult(rt *route.Route,
preimage lntypes.Preimage) *PaymentResult {
func createSuccessResult(htlcs []channeldb.HTLCAttempt) *PaymentResult {
// Extract any preimage from the list of HTLCs.
var preimage lntypes.Preimage
for _, htlc := range htlcs {
if htlc.Settle != nil {
preimage = htlc.Settle.Preimage
break
}
}
return &PaymentResult{
Success: true,
Preimage: preimage,
Route: rt,
HTLCs: htlcs,
}
}
// createFailResult creates a failed result to send to subscribers.
func createFailedResult(rt *route.Route,
func createFailedResult(htlcs []channeldb.HTLCAttempt,
reason channeldb.FailureReason) *PaymentResult {
result := &PaymentResult{
return &PaymentResult{
Success: false,
FailureReason: reason,
HTLCs: htlcs,
}
// In case of incorrect payment details, set the route. This can be used
// for probing and to extract a fee estimate from the route.
if reason == channeldb.FailureReasonPaymentDetails {
result.Route = rt
}
return result
}
// Fail transitions a payment into the Failed state, and records the reason the
@ -156,14 +155,16 @@ func createFailedResult(rt *route.Route,
func (p *controlTower) Fail(paymentHash lntypes.Hash,
reason channeldb.FailureReason) error {
route, err := p.db.Fail(paymentHash, reason)
payment, err := p.db.Fail(paymentHash, reason)
if err != nil {
return err
}
// Notify subscribers of fail event.
p.notifyFinalEvent(
paymentHash, createFailedResult(route, reason),
paymentHash, createFailedResult(
payment.HTLCs, reason,
),
)
return nil
@ -213,20 +214,14 @@ func (p *controlTower) SubscribePayment(paymentHash lntypes.Hash) (
// a subscriber, because we can send the result on the channel
// immediately.
case channeldb.StatusSucceeded:
event = *createSuccessResult(
&payment.Attempt.Route, *payment.Preimage,
)
event = *createSuccessResult(payment.HTLCs)
// Payment already failed. It is not necessary to register as a
// subscriber, because we can send the result on the channel
// immediately.
case channeldb.StatusFailed:
var route *route.Route
if payment.Attempt != nil {
route = &payment.Attempt.Route
}
event = *createFailedResult(
route, *payment.Failure,
payment.HTLCs, *payment.FailureReason,
)
default:

56
routing/control_tower_test.go
View File

@ -144,10 +144,13 @@ func TestControlTowerSubscribeSuccess(t *testing.T) {
if result.Preimage != preimg {
t.Fatal("unexpected preimage")
}
if !reflect.DeepEqual(result.Route, &attempt.Route) {
t.Fatalf("unexpected route: %v vs %v",
spew.Sdump(result.Route),
if len(result.HTLCs) != 1 {
t.Fatalf("expected one htlc, got %d", len(result.HTLCs))
}
htlc := result.HTLCs[0]
if !reflect.DeepEqual(htlc.Route, attempt.Route) {
t.Fatalf("unexpected htlc route: %v vs %v",
spew.Sdump(htlc.Route),
spew.Sdump(attempt.Route))
}
@ -168,6 +171,15 @@ func TestControlTowerSubscribeSuccess(t *testing.T) {
func TestPaymentControlSubscribeFail(t *testing.T) {
t.Parallel()
t.Run("register attempt", func(t *testing.T) {
testPaymentControlSubscribeFail(t, true)
})
t.Run("no register attempt", func(t *testing.T) {
testPaymentControlSubscribeFail(t, false)
})
}
func testPaymentControlSubscribeFail(t *testing.T, registerAttempt bool) {
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
@ -176,7 +188,7 @@ func TestPaymentControlSubscribeFail(t *testing.T) {
pControl := NewControlTower(channeldb.NewPaymentControl(db))
// Initiate a payment.
info, _, _, err := genInfo()
info, attempt, _, err := genInfo()
if err != nil {
t.Fatal(err)
}
@ -192,6 +204,17 @@ func TestPaymentControlSubscribeFail(t *testing.T) {
t.Fatalf("expected subscribe to succeed, but got: %v", err)
}
// Conditionally register the attempt based on the test type. This
// allows us to simulate failing after attempting with an htlc or before
// making any attempts at all.
if registerAttempt {
// Register an attempt.
err = pControl.RegisterAttempt(info.PaymentHash, attempt)
if err != nil {
t.Fatal(err)
}
}
// Mark the payment as failed.
if err := pControl.Fail(info.PaymentHash, channeldb.FailureReasonTimeout); err != nil {
t.Fatal(err)
@ -223,9 +246,28 @@ func TestPaymentControlSubscribeFail(t *testing.T) {
if result.Success {
t.Fatal("unexpected payment state")
}
if result.Route != nil {
t.Fatal("expected no route")
// There will either be one or zero htlcs depending on whether
// or not the attempt was registered. Assert the correct number
// is present, and the route taken if the attempt was
// registered.
if registerAttempt {
if len(result.HTLCs) != 1 {
t.Fatalf("expected 1 htlc, got: %d",
len(result.HTLCs))
}
htlc := result.HTLCs[0]
if !reflect.DeepEqual(htlc.Route, testRoute) {
t.Fatalf("unexpected htlc route: %v vs %v",
spew.Sdump(htlc.Route),
spew.Sdump(testRoute))
}
} else if len(result.HTLCs) != 0 {
t.Fatalf("expected 0 htlcs, got: %d",
len(result.HTLCs))
}
if result.FailureReason != channeldb.FailureReasonTimeout {
t.Fatal("unexpected failure reason")
}