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Merge pull request #2761 from halseth/reliable-payments-router-state-machine

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[reliable payments] router payment state machine
This commit is contained in:
Olaoluwa Osuntokun 2019-05-27 16:46:19 -07:00 committed by GitHub
commit 19fafd7a9a
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GPG Key ID: 4AEE18F83AFDEB23
24 changed files with 3569 additions and 1269 deletions
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15
channeldb/codec.go
View File

@ -148,6 +148,12 @@ func WriteElement(w io.Writer, element interface{}) error {
return err
}
case *btcec.PrivateKey:
b := e.Serialize()
if _, err := w.Write(b); err != nil {
return err
}
case *btcec.PublicKey:
b := e.SerializeCompressed()
if _, err := w.Write(b); err != nil {
@ -320,6 +326,15 @@ func ReadElement(r io.Reader, element interface{}) error {
*e = lnwire.MilliSatoshi(a)
case **btcec.PrivateKey:
var b [btcec.PrivKeyBytesLen]byte
if _, err := io.ReadFull(r, b[:]); err != nil {
return err
}
priv, _ := btcec.PrivKeyFromBytes(btcec.S256(), b[:])
*e = priv
case **btcec.PublicKey:
var b [btcec.PubKeyBytesLenCompressed]byte
if _, err := io.ReadFull(r, b[:]); err != nil {

463
channeldb/control_tower.go Normal file
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@ -0,0 +1,463 @@
package channeldb
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"github.com/coreos/bbolt"
"github.com/lightningnetwork/lnd/lntypes"
)
var (
// ErrAlreadyPaid signals we have already paid this payment hash.
ErrAlreadyPaid = errors.New("invoice is already paid")
// ErrPaymentInFlight signals that payment for this payment hash is
// already "in flight" on the network.
ErrPaymentInFlight = errors.New("payment is in transition")
// ErrPaymentNotInitiated is returned if payment wasn't initiated in
// switch.
ErrPaymentNotInitiated = errors.New("payment isn't initiated")
// ErrPaymentAlreadySucceeded is returned in the event we attempt to
// change the status of a payment already succeeded.
ErrPaymentAlreadySucceeded = errors.New("payment is already succeeded")
// ErrPaymentAlreadyFailed is returned in the event we attempt to
// re-fail a failed payment.
ErrPaymentAlreadyFailed = errors.New("payment has already failed")
// ErrUnknownPaymentStatus is returned when we do not recognize the
// existing state of a payment.
ErrUnknownPaymentStatus = errors.New("unknown payment status")
)
// ControlTower tracks all outgoing payments made, whose primary purpose is to
// prevent duplicate payments to the same payment hash. In production, a
// persistent implementation is preferred so that tracking can survive across
// restarts. Payments are transitioned through various payment states, and the
// ControlTower interface provides access to driving the state transitions.
type ControlTower interface {
// InitPayment atomically moves the payment into the InFlight state.
// This method checks that no suceeded payment exist for this payment
// hash.
InitPayment(lntypes.Hash, *PaymentCreationInfo) error
// RegisterAttempt atomically records the provided PaymentAttemptInfo.
RegisterAttempt(lntypes.Hash, *PaymentAttemptInfo) error
// Success transitions a payment into the Succeeded state. After
// invoking this method, InitPayment should always return an error to
// prevent us from making duplicate payments to the same payment hash.
// The provided preimage is atomically saved to the DB for record
// keeping.
Success(lntypes.Hash, lntypes.Preimage) error
// Fail transitions a payment into the Failed state, and records the
// reason the payment failed. After invoking this method, InitPayment
// should return nil on its next call for this payment hash, allowing
// the switch to make a subsequent payment.
Fail(lntypes.Hash, FailureReason) error
// FetchInFlightPayments returns all payments with status InFlight.
FetchInFlightPayments() ([]*InFlightPayment, error)
}
// paymentControl is persistent implementation of ControlTower to restrict
// double payment sending.
type paymentControl struct {
db *DB
}
// NewPaymentControl creates a new instance of the paymentControl.
func NewPaymentControl(db *DB) ControlTower {
return &paymentControl{
db: db,
}
}
// InitPayment checks or records the given PaymentCreationInfo with the DB,
// making sure it does not already exist as an in-flight payment. Then this
// method returns successfully, the payment is guranteeed to be in the InFlight
// state.
func (p *paymentControl) InitPayment(paymentHash lntypes.Hash,
info *PaymentCreationInfo) error {
var b bytes.Buffer
if err := serializePaymentCreationInfo(&b, info); err != nil {
return err
}
infoBytes := b.Bytes()
var updateErr error
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
bucket, err := createPaymentBucket(tx, paymentHash)
if err != nil {
return err
}
// Get the existing status of this payment, if any.
paymentStatus := fetchPaymentStatus(bucket)
switch paymentStatus {
// We allow retrying failed payments.
case StatusFailed:
// This is a new payment that is being initialized for the
// first time.
case StatusUnknown:
// We already have an InFlight payment on the network. We will
// disallow any new payments.
case StatusInFlight:
updateErr = ErrPaymentInFlight
return nil
// We've already succeeded a payment to this payment hash,
// forbid the switch from sending another.
case StatusSucceeded:
updateErr = ErrAlreadyPaid
return nil
default:
updateErr = ErrUnknownPaymentStatus
return nil
}
// Obtain a new sequence number for this payment. This is used
// to sort the payments in order of creation, and also acts as
// a unique identifier for each payment.
sequenceNum, err := nextPaymentSequence(tx)
if err != nil {
return err
}
err = bucket.Put(paymentSequenceKey, sequenceNum)
if err != nil {
return err
}
// Add the payment info to the bucket, which contains the
// static information for this payment
err = bucket.Put(paymentCreationInfoKey, infoBytes)
if err != nil {
return err
}
// We'll delete any lingering attempt info to start with, in
// case we are initializing a payment that was attempted
// earlier, but left in a state where we could retry.
err = bucket.Delete(paymentAttemptInfoKey)
if err != nil {
return err
}
// Also delete any lingering failure info now that we are
// re-attempting.
return bucket.Delete(paymentFailInfoKey)
})
if err != nil {
return nil
}
return updateErr
}
// RegisterAttempt atomically records the provided PaymentAttemptInfo to the
// DB.
func (p *paymentControl) RegisterAttempt(paymentHash lntypes.Hash,
attempt *PaymentAttemptInfo) error {
// Serialize the information before opening the db transaction.
var a bytes.Buffer
if err := serializePaymentAttemptInfo(&a, attempt); err != nil {
return err
}
attemptBytes := a.Bytes()
var updateErr error
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
bucket, err := fetchPaymentBucket(tx, paymentHash)
if err == ErrPaymentNotInitiated {
updateErr = ErrPaymentNotInitiated
return nil
} else if err != nil {
return err
}
// We can only register attempts for payments that are
// in-flight.
if err := ensureInFlight(bucket); err != nil {
updateErr = err
return nil
}
// Add the payment attempt to the payments bucket.
return bucket.Put(paymentAttemptInfoKey, attemptBytes)
})
if err != nil {
return err
}
return updateErr
}
// Success transitions a payment into the Succeeded state. After invoking this
// method, InitPayment should always return an error to prevent us from making
// 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) error {
var updateErr error
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
bucket, err := fetchPaymentBucket(tx, paymentHash)
if err == ErrPaymentNotInitiated {
updateErr = ErrPaymentNotInitiated
return nil
} else if err != nil {
return err
}
// We can only mark in-flight payments as succeeded.
if err := ensureInFlight(bucket); err != nil {
updateErr = err
return nil
}
// Record the successful payment info atomically to the
// payments record.
return bucket.Put(paymentSettleInfoKey, preimage[:])
})
if err != nil {
return err
}
return updateErr
}
// Fail transitions a payment into the Failed state, and records the reason the
// payment failed. After invoking this method, InitPayment should return nil on
// its next call for this payment hash, allowing the switch to make a
// subsequent payment.
func (p *paymentControl) Fail(paymentHash lntypes.Hash,
reason FailureReason) error {
var updateErr error
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
bucket, err := fetchPaymentBucket(tx, paymentHash)
if err == ErrPaymentNotInitiated {
updateErr = ErrPaymentNotInitiated
return nil
} else if err != nil {
return err
}
// We can only mark in-flight payments as failed.
if err := ensureInFlight(bucket); err != nil {
updateErr = err
return nil
}
// Put the failure reason in the bucket for record keeping.
v := []byte{byte(reason)}
return bucket.Put(paymentFailInfoKey, v)
})
if err != nil {
return err
}
return updateErr
}
// createPaymentBucket creates or fetches the sub-bucket assigned to this
// payment hash.
func createPaymentBucket(tx *bbolt.Tx, paymentHash lntypes.Hash) (
*bbolt.Bucket, error) {
payments, err := tx.CreateBucketIfNotExists(paymentsRootBucket)
if err != nil {
return nil, err
}
return payments.CreateBucketIfNotExists(paymentHash[:])
}
// fetchPaymentBucket fetches the sub-bucket assigned to this payment hash. If
// the bucket does not exist, it returns ErrPaymentNotInitiated.
func fetchPaymentBucket(tx *bbolt.Tx, paymentHash lntypes.Hash) (
*bbolt.Bucket, error) {
payments := tx.Bucket(paymentsRootBucket)
if payments == nil {
return nil, ErrPaymentNotInitiated
}
bucket := payments.Bucket(paymentHash[:])
if bucket == nil {
return nil, ErrPaymentNotInitiated
}
return bucket, nil
}
// nextPaymentSequence returns the next sequence number to store for a new
// payment.
func nextPaymentSequence(tx *bbolt.Tx) ([]byte, error) {
payments, err := tx.CreateBucketIfNotExists(paymentsRootBucket)
if err != nil {
return nil, err
}
seq, err := payments.NextSequence()
if err != nil {
return nil, err
}
b := make([]byte, 8)
binary.BigEndian.PutUint64(b, seq)
return b, nil
}
// fetchPaymentStatus fetches the payment status of the payment. If the payment
// isn't found, it will default to "StatusUnknown".
func fetchPaymentStatus(bucket *bbolt.Bucket) PaymentStatus {
if bucket.Get(paymentSettleInfoKey) != nil {
return StatusSucceeded
}
if bucket.Get(paymentFailInfoKey) != nil {
return StatusFailed
}
if bucket.Get(paymentCreationInfoKey) != nil {
return StatusInFlight
}
return StatusUnknown
}
// ensureInFlight checks whether the payment found in the given bucket has
// status InFlight, and returns an error otherwise. This should be used to
// ensure we only mark in-flight payments as succeeded or failed.
func ensureInFlight(bucket *bbolt.Bucket) error {
paymentStatus := fetchPaymentStatus(bucket)
switch {
// The payment was indeed InFlight, return.
case paymentStatus == StatusInFlight:
return nil
// Our records show the payment as unknown, meaning it never
// should have left the switch.
case paymentStatus == StatusUnknown:
return ErrPaymentNotInitiated
// The payment succeeded previously.
case paymentStatus == StatusSucceeded:
return ErrPaymentAlreadySucceeded
// The payment was already failed.
case paymentStatus == StatusFailed:
return ErrPaymentAlreadyFailed
default:
return ErrUnknownPaymentStatus
}
}
// InFlightPayment is a wrapper around a payment that has status InFlight.
type InFlightPayment struct {
// Info is the PaymentCreationInfo of the in-flight payment.
Info *PaymentCreationInfo
// Attempt contains information about the last payment attempt that was
// made to this payment hash.
//
// NOTE: Might be nil.
Attempt *PaymentAttemptInfo
}
// FetchInFlightPayments returns all payments with status InFlight.
func (p *paymentControl) FetchInFlightPayments() ([]*InFlightPayment, error) {
var inFlights []*InFlightPayment
err := p.db.View(func(tx *bbolt.Tx) error {
payments := tx.Bucket(paymentsRootBucket)
if payments == nil {
return nil
}
return payments.ForEach(func(k, _ []byte) error {
bucket := payments.Bucket(k)
if bucket == nil {
return fmt.Errorf("non bucket element")
}
// If the status is not InFlight, we can return early.
paymentStatus := fetchPaymentStatus(bucket)
if paymentStatus != StatusInFlight {
return nil
}
var (
inFlight = &InFlightPayment{}
err error
)
// Get the CreationInfo.
b := bucket.Get(paymentCreationInfoKey)
if b == nil {
return fmt.Errorf("unable to find creation " +
"info for inflight payment")
}
r := bytes.NewReader(b)
inFlight.Info, err = deserializePaymentCreationInfo(r)
if err != nil {
return err
}
// Now get the attempt info, which may or may not be
// available.
attempt := bucket.Get(paymentAttemptInfoKey)
if attempt != nil {
r = bytes.NewReader(attempt)
inFlight.Attempt, err = deserializePaymentAttemptInfo(r)
if err != nil {
return err
}
}
inFlights = append(inFlights, inFlight)
return nil
})
})
if err != nil {
return nil, err
}
return inFlights, nil
}

546
channeldb/control_tower_test.go Normal file
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@ -0,0 +1,546 @@
package channeldb
import (
"bytes"
"crypto/rand"
"fmt"
"io"
"io/ioutil"
"reflect"
"testing"
"time"
"github.com/btcsuite/fastsha256"
"github.com/coreos/bbolt"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/lntypes"
)
func initDB() (*DB, error) {
tempPath, err := ioutil.TempDir("", "switchdb")
if err != nil {
return nil, err
}
db, err := Open(tempPath)
if err != nil {
return nil, err
}
return db, err
}
func genPreimage() ([32]byte, error) {
var preimage [32]byte
if _, err := io.ReadFull(rand.Reader, preimage[:]); err != nil {
return preimage, err
}
return preimage, nil
}
func genInfo() (*PaymentCreationInfo, *PaymentAttemptInfo,
lntypes.Preimage, error) {
preimage, err := genPreimage()
if err != nil {
return nil, nil, preimage, fmt.Errorf("unable to "+
"generate preimage: %v", err)
}
rhash := fastsha256.Sum256(preimage[:])
return &PaymentCreationInfo{
PaymentHash: rhash,
Value: 1,
CreationDate: time.Unix(time.Now().Unix(), 0),
PaymentRequest: []byte("hola"),
},
&PaymentAttemptInfo{
PaymentID: 1,
SessionKey: priv,
Route: testRoute,
}, preimage, nil
}
// TestPaymentControlSwitchFail checks that payment status returns to Failed
// status after failing, and that InitPayment allows another HTLC for the
// same payment hash.
func TestPaymentControlSwitchFail(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(db)
info, attempt, preimg, err := genInfo()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Sends base htlc message which initiate StatusInFlight.
err = pControl.InitPayment(info.PaymentHash, info)
if err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusInFlight)
assertPaymentInfo(
t, db, info.PaymentHash, info, nil, lntypes.Preimage{},
nil,
)
// Fail the payment, which should moved it to Failed.
failReason := FailureReasonNoRoute
err = pControl.Fail(info.PaymentHash, failReason)
if err != nil {
t.Fatalf("unable to fail payment hash: %v", err)
}
// Verify the status is indeed Failed.
assertPaymentStatus(t, db, info.PaymentHash, StatusFailed)
assertPaymentInfo(
t, db, info.PaymentHash, info, nil, lntypes.Preimage{},
&failReason,
)
// Sends the htlc again, which should succeed since the prior payment
// failed.
err = pControl.InitPayment(info.PaymentHash, info)
if err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusInFlight)
assertPaymentInfo(
t, db, info.PaymentHash, info, nil, lntypes.Preimage{},
nil,
)
// Record a new attempt.
attempt.PaymentID = 2
err = pControl.RegisterAttempt(info.PaymentHash, attempt)
if err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusInFlight)
assertPaymentInfo(
t, db, info.PaymentHash, info, attempt, lntypes.Preimage{},
nil,
)
// Verifies that status was changed to StatusSucceeded.
if err := pControl.Success(info.PaymentHash, preimg); err != nil {
t.Fatalf("error shouldn't have been received, got: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusSucceeded)
assertPaymentInfo(t, db, info.PaymentHash, info, attempt, preimg, nil)
// Attempt a final payment, which should now fail since the prior
// payment succeed.
err = pControl.InitPayment(info.PaymentHash, info)
if err != ErrAlreadyPaid {
t.Fatalf("unable to send htlc message: %v", err)
}
}
// TestPaymentControlSwitchDoubleSend checks the ability of payment control to
// prevent double sending of htlc message, when message is in StatusInFlight.
func TestPaymentControlSwitchDoubleSend(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(db)
info, attempt, preimg, err := genInfo()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Sends base htlc message which initiate base status and move it to
// StatusInFlight and verifies that it was changed.
err = pControl.InitPayment(info.PaymentHash, info)
if err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusInFlight)
assertPaymentInfo(
t, db, info.PaymentHash, info, nil, lntypes.Preimage{},
nil,
)
// Try to initiate double sending of htlc message with the same
// payment hash, should result in error indicating that payment has
// already been sent.
err = pControl.InitPayment(info.PaymentHash, info)
if err != ErrPaymentInFlight {
t.Fatalf("payment control wrong behaviour: " +
"double sending must trigger ErrPaymentInFlight error")
}
// Record an attempt.
err = pControl.RegisterAttempt(info.PaymentHash, attempt)
if err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusInFlight)
assertPaymentInfo(
t, db, info.PaymentHash, info, attempt, lntypes.Preimage{},
nil,
)
// Sends base htlc message which initiate StatusInFlight.
err = pControl.InitPayment(info.PaymentHash, info)
if err != ErrPaymentInFlight {
t.Fatalf("payment control wrong behaviour: " +
"double sending must trigger ErrPaymentInFlight error")
}
// After settling, the error should be ErrAlreadyPaid.
if err := pControl.Success(info.PaymentHash, preimg); err != nil {
t.Fatalf("error shouldn't have been received, got: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusSucceeded)
assertPaymentInfo(t, db, info.PaymentHash, info, attempt, preimg, nil)
err = pControl.InitPayment(info.PaymentHash, info)
if err != ErrAlreadyPaid {
t.Fatalf("unable to send htlc message: %v", err)
}
}
// TestPaymentControlSuccessesWithoutInFlight checks that the payment
// control will disallow calls to Success when no payment is in flight.
func TestPaymentControlSuccessesWithoutInFlight(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(db)
info, _, preimg, err := genInfo()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Attempt to complete the payment should fail.
err = pControl.Success(info.PaymentHash, preimg)
if err != ErrPaymentNotInitiated {
t.Fatalf("expected ErrPaymentNotInitiated, got %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusUnknown)
assertPaymentInfo(
t, db, info.PaymentHash, nil, nil, lntypes.Preimage{},
nil,
)
}
// TestPaymentControlFailsWithoutInFlight checks that a strict payment
// control will disallow calls to Fail when no payment is in flight.
func TestPaymentControlFailsWithoutInFlight(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(db)
info, _, _, err := genInfo()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Calling Fail should return an error.
err = pControl.Fail(info.PaymentHash, FailureReasonNoRoute)
if err != ErrPaymentNotInitiated {
t.Fatalf("expected ErrPaymentNotInitiated, got %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusUnknown)
assertPaymentInfo(
t, db, info.PaymentHash, nil, nil, lntypes.Preimage{}, nil,
)
}
// TestPaymentControlDeleteNonInFlight checks that calling DeletaPayments only
// deletes payments from the database that are not in-flight.
func TestPaymentControlDeleteNonInFligt(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(db)
payments := []struct {
failed bool
success bool
}{
{
failed: true,
success: false,
},
{
failed: false,
success: true,
},
{
failed: false,
success: false,
},
}
for _, p := range payments {
info, attempt, preimg, err := genInfo()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Sends base htlc message which initiate StatusInFlight.
err = pControl.InitPayment(info.PaymentHash, info)
if err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
err = pControl.RegisterAttempt(info.PaymentHash, attempt)
if err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
if p.failed {
// Fail the payment, which should moved it to Failed.
failReason := FailureReasonNoRoute
err = pControl.Fail(info.PaymentHash, failReason)
if err != nil {
t.Fatalf("unable to fail payment hash: %v", err)
}
// Verify the status is indeed Failed.
assertPaymentStatus(t, db, info.PaymentHash, StatusFailed)
assertPaymentInfo(
t, db, info.PaymentHash, info, attempt,
lntypes.Preimage{}, &failReason,
)
} else if p.success {
// Verifies that status was changed to StatusSucceeded.
err := pControl.Success(info.PaymentHash, preimg)
if err != nil {
t.Fatalf("error shouldn't have been received, got: %v", err)
}
assertPaymentStatus(t, db, info.PaymentHash, StatusSucceeded)
assertPaymentInfo(
t, db, info.PaymentHash, info, attempt, preimg, nil,
)
} else {
assertPaymentStatus(t, db, info.PaymentHash, StatusInFlight)
assertPaymentInfo(
t, db, info.PaymentHash, info, attempt,
lntypes.Preimage{}, nil,
)
}
}
// Delete payments.
if err := db.DeletePayments(); err != nil {
t.Fatal(err)
}
// This should leave the in-flight payment.
dbPayments, err := db.FetchPayments()
if err != nil {
t.Fatal(err)
}
if len(dbPayments) != 1 {
t.Fatalf("expected one payment, got %d", len(dbPayments))
}
status := dbPayments[0].Status
if status != StatusInFlight {
t.Fatalf("expected in-fligth status, got %v", status)
}
}
func assertPaymentStatus(t *testing.T, db *DB,
hash [32]byte, expStatus PaymentStatus) {
t.Helper()
var paymentStatus = StatusUnknown
err := db.View(func(tx *bbolt.Tx) error {
payments := tx.Bucket(paymentsRootBucket)
if payments == nil {
return nil
}
bucket := payments.Bucket(hash[:])
if bucket == nil {
return nil
}
// Get the existing status of this payment, if any.
paymentStatus = fetchPaymentStatus(bucket)
return nil
})
if err != nil {
t.Fatalf("unable to fetch payment status: %v", err)
}
if paymentStatus != expStatus {
t.Fatalf("payment status mismatch: expected %v, got %v",
expStatus, paymentStatus)
}
}
func checkPaymentCreationInfo(bucket *bbolt.Bucket, c *PaymentCreationInfo) error {
b := bucket.Get(paymentCreationInfoKey)
switch {
case b == nil && c == nil:
return nil
case b == nil:
return fmt.Errorf("expected creation info not found")
case c == nil:
return fmt.Errorf("unexpected creation info found")
}
r := bytes.NewReader(b)
c2, err := deserializePaymentCreationInfo(r)
if err != nil {
fmt.Println("creation info err: ", err)
return err
}
if !reflect.DeepEqual(c, c2) {
return fmt.Errorf("PaymentCreationInfos don't match: %v vs %v",
spew.Sdump(c), spew.Sdump(c2))
}
return nil
}
func checkPaymentAttemptInfo(bucket *bbolt.Bucket, a *PaymentAttemptInfo) error {
b := bucket.Get(paymentAttemptInfoKey)
switch {
case b == nil && a == nil:
return nil
case b == nil:
return fmt.Errorf("expected attempt info not found")
case a == nil:
return fmt.Errorf("unexpected attempt info found")
}
r := bytes.NewReader(b)
a2, err := deserializePaymentAttemptInfo(r)
if err != nil {
return err
}
if !reflect.DeepEqual(a, a2) {
return fmt.Errorf("PaymentAttemptInfos don't match: %v vs %v",
spew.Sdump(a), spew.Sdump(a2))
}
return nil
}
func checkSettleInfo(bucket *bbolt.Bucket, preimg lntypes.Preimage) error {
zero := lntypes.Preimage{}
b := bucket.Get(paymentSettleInfoKey)
switch {
case b == nil && preimg == zero:
return nil
case b == nil:
return fmt.Errorf("expected preimage not found")
case preimg == zero:
return fmt.Errorf("unexpected preimage found")
}
var pre2 lntypes.Preimage
copy(pre2[:], b[:])
if preimg != pre2 {
return fmt.Errorf("Preimages don't match: %x vs %x",
preimg, pre2)
}
return nil
}
func checkFailInfo(bucket *bbolt.Bucket, failReason *FailureReason) error {
b := bucket.Get(paymentFailInfoKey)
switch {
case b == nil && failReason == nil:
return nil
case b == nil:
return fmt.Errorf("expected fail info not found")
case failReason == nil:
return fmt.Errorf("unexpected fail info found")
}
failReason2 := FailureReason(b[0])
if *failReason != failReason2 {
return fmt.Errorf("Failure infos don't match: %v vs %v",
*failReason, failReason2)
}
return nil
}
func assertPaymentInfo(t *testing.T, db *DB, hash lntypes.Hash,
c *PaymentCreationInfo, a *PaymentAttemptInfo, s lntypes.Preimage,
f *FailureReason) {
t.Helper()
err := db.View(func(tx *bbolt.Tx) error {
payments := tx.Bucket(paymentsRootBucket)
if payments == nil && c == nil {
return nil
}
if payments == nil {
return fmt.Errorf("sent payments not found")
}
bucket := payments.Bucket(hash[:])
if bucket == nil && c == nil {
return nil
}
if bucket == nil {
return fmt.Errorf("payment not found")
}
if err := checkPaymentCreationInfo(bucket, c); err != nil {
return err
}
if err := checkPaymentAttemptInfo(bucket, a); err != nil {
return err
}
if err := checkSettleInfo(bucket, s); err != nil {
return err
}
if err := checkFailInfo(bucket, f); err != nil {
return err
}
return nil
})
if err != nil {
t.Fatalf("assert payment info failed: %v", err)
}
}

7
channeldb/db.go
View File

@ -96,6 +96,13 @@ var (
number: 8,
migration: migrateGossipMessageStoreKeys,
},
{
// The DB version where the payments and payment
// statuses are moved to being stored in a combined
// bucket.
number: 9,
migration: migrateOutgoingPayments,
},
}
// Big endian is the preferred byte order, due to cursor scans over

4
channeldb/legacy_serialization.go
View File

@ -1,6 +1,8 @@
package channeldb
import "io"
import (
"io"
)
// deserializeCloseChannelSummaryV6 reads the v6 database format for
// ChannelCloseSummary.

10
channeldb/meta_test.go
View File

@ -20,6 +20,16 @@ func applyMigration(t *testing.T, beforeMigration, afterMigration func(d *DB),
t.Fatal(err)
}
// Create a test node that will be our source node.
testNode, err := createTestVertex(cdb)
if err != nil {
t.Fatal(err)
}
graph := cdb.ChannelGraph()
if err := graph.SetSourceNode(testNode); err != nil {
t.Fatal(err)
}
// beforeMigration usually used for populating the database
// with test data.
beforeMigration(cdb)

255
channeldb/migration_09_legacy_serialization.go Normal file
View File

@ -0,0 +1,255 @@
package channeldb
import (
"bytes"
"encoding/binary"
"io"
"github.com/coreos/bbolt"
"github.com/lightningnetwork/lnd/lnwire"
)
var (
// paymentBucket is the name of the bucket within the database that
// stores all data related to payments.
//
// Within the payments bucket, each invoice is keyed by its invoice ID
// which is a monotonically increasing uint64. BoltDB's sequence
// feature is used for generating monotonically increasing id.
//
// NOTE: Deprecated. Kept around for migration purposes.
paymentBucket = []byte("payments")
// paymentStatusBucket is the name of the bucket within the database
// that stores the status of a payment indexed by the payment's
// preimage.
//
// NOTE: Deprecated. Kept around for migration purposes.
paymentStatusBucket = []byte("payment-status")
)
// outgoingPayment represents a successful payment between the daemon and a
// remote node. Details such as the total fee paid, and the time of the payment
// are stored.
//
// NOTE: Deprecated. Kept around for migration purposes.
type outgoingPayment struct {
Invoice
// Fee is the total fee paid for the payment in milli-satoshis.
Fee lnwire.MilliSatoshi
// TotalTimeLock is the total cumulative time-lock in the HTLC extended
// from the second-to-last hop to the destination.
TimeLockLength uint32
// Path encodes the path the payment took through the network. The path
// excludes the outgoing node and consists of the hex-encoded
// compressed public key of each of the nodes involved in the payment.
Path [][33]byte
// PaymentPreimage is the preImage of a successful payment. This is used
// to calculate the PaymentHash as well as serve as a proof of payment.
PaymentPreimage [32]byte
}
// addPayment saves a successful payment to the database. It is assumed that
// all payment are sent using unique payment hashes.
//
// NOTE: Deprecated. Kept around for migration purposes.
func (db *DB) addPayment(payment *outgoingPayment) error {
// Validate the field of the inner voice within the outgoing payment,
// these must also adhere to the same constraints as regular invoices.
if err := validateInvoice(&payment.Invoice); err != nil {
return err
}
// We first serialize the payment before starting the database
// transaction so we can avoid creating a DB payment in the case of a
// serialization error.
var b bytes.Buffer
if err := serializeOutgoingPayment(&b, payment); err != nil {
return err
}
paymentBytes := b.Bytes()
return db.Batch(func(tx *bbolt.Tx) error {
payments, err := tx.CreateBucketIfNotExists(paymentBucket)
if err != nil {
return err
}
// Obtain the new unique sequence number for this payment.
paymentID, err := payments.NextSequence()
if err != nil {
return err
}
// We use BigEndian for keys as it orders keys in
// ascending order. This allows bucket scans to order payments
// in the order in which they were created.
paymentIDBytes := make([]byte, 8)
binary.BigEndian.PutUint64(paymentIDBytes, paymentID)
return payments.Put(paymentIDBytes, paymentBytes)
})
}
// fetchAllPayments returns all outgoing payments in DB.
//
// NOTE: Deprecated. Kept around for migration purposes.
func (db *DB) fetchAllPayments() ([]*outgoingPayment, error) {
var payments []*outgoingPayment
err := db.View(func(tx *bbolt.Tx) error {
bucket := tx.Bucket(paymentBucket)
if bucket == nil {
return ErrNoPaymentsCreated
}
return bucket.ForEach(func(k, v []byte) error {
// If the value is nil, then we ignore it as it may be
// a sub-bucket.
if v == nil {
return nil
}
r := bytes.NewReader(v)
payment, err := deserializeOutgoingPayment(r)
if err != nil {
return err
}
payments = append(payments, payment)
return nil
})
})
if err != nil {
return nil, err
}
return payments, nil
}
// fetchPaymentStatus returns the payment status for outgoing payment.
// If status of the payment isn't found, it will default to "StatusUnknown".
//
// NOTE: Deprecated. Kept around for migration purposes.
func (db *DB) fetchPaymentStatus(paymentHash [32]byte) (PaymentStatus, error) {
var paymentStatus = StatusUnknown
err := db.View(func(tx *bbolt.Tx) error {
var err error
paymentStatus, err = fetchPaymentStatusTx(tx, paymentHash)
return err
})
if err != nil {
return StatusUnknown, err
}
return paymentStatus, nil
}
// fetchPaymentStatusTx is a helper method that returns the payment status for
// outgoing payment. If status of the payment isn't found, it will default to
// "StatusUnknown". It accepts the boltdb transactions such that this method
// can be composed into other atomic operations.
//
// NOTE: Deprecated. Kept around for migration purposes.
func fetchPaymentStatusTx(tx *bbolt.Tx, paymentHash [32]byte) (PaymentStatus, error) {
// The default status for all payments that aren't recorded in database.
var paymentStatus = StatusUnknown
bucket := tx.Bucket(paymentStatusBucket)
if bucket == nil {
return paymentStatus, nil
}
paymentStatusBytes := bucket.Get(paymentHash[:])
if paymentStatusBytes == nil {
return paymentStatus, nil
}
paymentStatus.FromBytes(paymentStatusBytes)
return paymentStatus, nil
}
func serializeOutgoingPayment(w io.Writer, p *outgoingPayment) error {
var scratch [8]byte
if err := serializeInvoice(w, &p.Invoice); err != nil {
return err
}
byteOrder.PutUint64(scratch[:], uint64(p.Fee))
if _, err := w.Write(scratch[:]); err != nil {
return err
}
// First write out the length of the bytes to prefix the value.
pathLen := uint32(len(p.Path))
byteOrder.PutUint32(scratch[:4], pathLen)
if _, err := w.Write(scratch[:4]); err != nil {
return err
}
// Then with the path written, we write out the series of public keys
// involved in the path.
for _, hop := range p.Path {
if _, err := w.Write(hop[:]); err != nil {
return err
}
}
byteOrder.PutUint32(scratch[:4], p.TimeLockLength)
if _, err := w.Write(scratch[:4]); err != nil {
return err
}
if _, err := w.Write(p.PaymentPreimage[:]); err != nil {
return err
}
return nil
}
func deserializeOutgoingPayment(r io.Reader) (*outgoingPayment, error) {
var scratch [8]byte
p := &outgoingPayment{}
inv, err := deserializeInvoice(r)
if err != nil {
return nil, err
}
p.Invoice = inv
if _, err := r.Read(scratch[:]); err != nil {
return nil, err
}
p.Fee = lnwire.MilliSatoshi(byteOrder.Uint64(scratch[:]))
if _, err = r.Read(scratch[:4]); err != nil {
return nil, err
}
pathLen := byteOrder.Uint32(scratch[:4])
path := make([][33]byte, pathLen)
for i := uint32(0); i < pathLen; i++ {
if _, err := r.Read(path[i][:]); err != nil {
return nil, err
}
}
p.Path = path
if _, err = r.Read(scratch[:4]); err != nil {
return nil, err
}
p.TimeLockLength = byteOrder.Uint32(scratch[:4])
if _, err := r.Read(p.PaymentPreimage[:]); err != nil {
return nil, err
}
return p, nil
}

191
channeldb/migrations.go
View File

@ -6,8 +6,10 @@ import (
"encoding/binary"
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/coreos/bbolt"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing/route"
)
// migrateNodeAndEdgeUpdateIndex is a migration function that will update the
@ -449,7 +451,7 @@ func paymentStatusesMigration(tx *bbolt.Tx) error {
// Update status for current payment to completed. If it fails,
// the migration is aborted and the payment bucket is returned
// to its previous state.
return paymentStatuses.Put(paymentHash[:], StatusCompleted.Bytes())
return paymentStatuses.Put(paymentHash[:], StatusSucceeded.Bytes())
})
if err != nil {
return err
@ -683,3 +685,190 @@ func migrateGossipMessageStoreKeys(tx *bbolt.Tx) error {
return nil
}
// migrateOutgoingPayments moves the OutgoingPayments into a new bucket format
// where they all reside in a top-level bucket indexed by the payment hash. In
// this sub-bucket we store information relevant to this payment, such as the
// payment status.
//
// Since the router cannot handle resumed payments that have the status
// InFlight (we have no PaymentAttemptInfo available for pre-migration
// payments) we delete those statuses, so only Completed payments remain in the
// new bucket structure.
func migrateOutgoingPayments(tx *bbolt.Tx) error {
oldPayments, err := tx.CreateBucketIfNotExists(paymentBucket)
if err != nil {
return err
}
newPayments, err := tx.CreateBucket(paymentsRootBucket)
if err != nil {
return err
}
// Get the source pubkey.
nodes := tx.Bucket(nodeBucket)
if nodes == nil {
return ErrGraphNotFound
}
selfPub := nodes.Get(sourceKey)
if selfPub == nil {
return ErrSourceNodeNotSet
}
var sourcePubKey [33]byte
copy(sourcePubKey[:], selfPub[:])
log.Infof("Migrating outgoing payments to new bucket structure")
err = oldPayments.ForEach(func(k, v []byte) error {
// Ignores if it is sub-bucket.
if v == nil {
return nil
}
// Read the old payment format.
r := bytes.NewReader(v)
payment, err := deserializeOutgoingPayment(r)
if err != nil {
return err
}
// Calculate payment hash from the payment preimage.
paymentHash := sha256.Sum256(payment.PaymentPreimage[:])
// Now create and add a PaymentCreationInfo to the bucket.
c := &PaymentCreationInfo{
PaymentHash: paymentHash,
Value: payment.Terms.Value,
CreationDate: payment.CreationDate,
PaymentRequest: payment.PaymentRequest,
}
var infoBuf bytes.Buffer
if err := serializePaymentCreationInfo(&infoBuf, c); err != nil {
return err
}
// Do the same for the PaymentAttemptInfo.
totalAmt := payment.Terms.Value + payment.Fee
rt := route.Route{
TotalTimeLock: payment.TimeLockLength,
TotalAmount: totalAmt,
SourcePubKey: sourcePubKey,
Hops: []*route.Hop{},
}
for _, hop := range payment.Path {
rt.Hops = append(rt.Hops, &route.Hop{
PubKeyBytes: hop,
AmtToForward: totalAmt,
})
}
// Since the old format didn't store the fee for individual
// hops, we let the last hop eat the whole fee for the total to
// add up.
if len(rt.Hops) > 0 {
rt.Hops[len(rt.Hops)-1].AmtToForward = payment.Terms.Value
}
// Since we don't have the session key for old payments, we
// create a random one to be able to serialize the attempt
// info.
priv, _ := btcec.NewPrivateKey(btcec.S256())
s := &PaymentAttemptInfo{
PaymentID: 0, // unknown.
SessionKey: priv, // unknown.
Route: rt,
}
var attemptBuf bytes.Buffer
if err := serializePaymentAttemptInfo(&attemptBuf, s); err != nil {
return err
}
// Reuse the existing payment sequence number.
var seqNum [8]byte
copy(seqNum[:], k)
// Create a bucket indexed by the payment hash.
bucket, err := newPayments.CreateBucket(paymentHash[:])
// If the bucket already exists, it means that we are migrating
// from a database containing duplicate payments to a payment
// hash. To keep this information, we store such duplicate
// payments in a sub-bucket.
if err == bbolt.ErrBucketExists {
pHashBucket := newPayments.Bucket(paymentHash[:])
// Create a bucket for duplicate payments within this
// payment hash's bucket.
dup, err := pHashBucket.CreateBucketIfNotExists(
paymentDuplicateBucket,
)
if err != nil {
return err
}
// Each duplicate will get its own sub-bucket within
// this bucket, so use their sequence number to index
// them by.
bucket, err = dup.CreateBucket(seqNum[:])
if err != nil {
return err
}
} else if err != nil {
return err
}
// Store the payment's information to the bucket.
err = bucket.Put(paymentSequenceKey, seqNum[:])
if err != nil {
return err
}
err = bucket.Put(paymentCreationInfoKey, infoBuf.Bytes())
if err != nil {
return err
}
err = bucket.Put(paymentAttemptInfoKey, attemptBuf.Bytes())
if err != nil {
return err
}
err = bucket.Put(paymentSettleInfoKey, payment.PaymentPreimage[:])
if err != nil {
return err
}
return nil
})
if err != nil {
return err
}
// To continue producing unique sequence numbers, we set the sequence
// of the new bucket to that of the old one.
seq := oldPayments.Sequence()
if err := newPayments.SetSequence(seq); err != nil {
return err
}
// Now we delete the old buckets. Deleting the payment status buckets
// deletes all payment statuses other than Complete.
err = tx.DeleteBucket(paymentStatusBucket)
if err != nil && err != bbolt.ErrBucketNotFound {
return err
}
// Finally delete the old payment bucket.
err = tx.DeleteBucket(paymentBucket)
if err != nil && err != bbolt.ErrBucketNotFound {
return err
}
log.Infof("Migration of outgoing payment bucket structure completed!")
return nil
}

183
channeldb/migrations_test.go
View File

@ -26,11 +26,11 @@ func TestPaymentStatusesMigration(t *testing.T) {
// Add fake payment to test database, verifying that it was created,
// that we have only one payment, and its status is not "Completed".
beforeMigrationFunc := func(d *DB) {
if err := d.AddPayment(fakePayment); err != nil {
if err := d.addPayment(fakePayment); err != nil {
t.Fatalf("unable to add payment: %v", err)
}
payments, err := d.FetchAllPayments()
payments, err := d.fetchAllPayments()
if err != nil {
t.Fatalf("unable to fetch payments: %v", err)
}
@ -40,15 +40,15 @@ func TestPaymentStatusesMigration(t *testing.T) {
len(payments))
}
paymentStatus, err := d.FetchPaymentStatus(paymentHash)
paymentStatus, err := d.fetchPaymentStatus(paymentHash)
if err != nil {
t.Fatalf("unable to fetch payment status: %v", err)
}
// We should receive default status if we have any in database.
if paymentStatus != StatusGrounded {
if paymentStatus != StatusUnknown {
t.Fatalf("wrong payment status: expected %v, got %v",
StatusGrounded.String(), paymentStatus.String())
StatusUnknown.String(), paymentStatus.String())
}
// Lastly, we'll add a locally-sourced circuit and
@ -141,14 +141,14 @@ func TestPaymentStatusesMigration(t *testing.T) {
}
// Check that our completed payments were migrated.
paymentStatus, err := d.FetchPaymentStatus(paymentHash)
paymentStatus, err := d.fetchPaymentStatus(paymentHash)
if err != nil {
t.Fatalf("unable to fetch payment status: %v", err)
}
if paymentStatus != StatusCompleted {
if paymentStatus != StatusSucceeded {
t.Fatalf("wrong payment status: expected %v, got %v",
StatusCompleted.String(), paymentStatus.String())
StatusSucceeded.String(), paymentStatus.String())
}
inFlightHash := [32]byte{
@ -160,7 +160,7 @@ func TestPaymentStatusesMigration(t *testing.T) {
// Check that the locally sourced payment was transitioned to
// InFlight.
paymentStatus, err = d.FetchPaymentStatus(inFlightHash)
paymentStatus, err = d.fetchPaymentStatus(inFlightHash)
if err != nil {
t.Fatalf("unable to fetch payment status: %v", err)
}
@ -179,14 +179,14 @@ func TestPaymentStatusesMigration(t *testing.T) {
// Check that non-locally sourced payments remain in the default
// Grounded state.
paymentStatus, err = d.FetchPaymentStatus(groundedHash)
paymentStatus, err = d.fetchPaymentStatus(groundedHash)
if err != nil {
t.Fatalf("unable to fetch payment status: %v", err)
}
if paymentStatus != StatusGrounded {
if paymentStatus != StatusUnknown {
t.Fatalf("wrong payment status: expected %v, got %v",
StatusGrounded.String(), paymentStatus.String())
StatusUnknown.String(), paymentStatus.String())
}
}
@ -564,3 +564,162 @@ func TestMigrateGossipMessageStoreKeys(t *testing.T) {
migrateGossipMessageStoreKeys, false,
)
}
// TestOutgoingPaymentsMigration checks that OutgoingPayments are migrated to a
// new bucket structure after the migration.
func TestOutgoingPaymentsMigration(t *testing.T) {
t.Parallel()
const numPayments = 4
var oldPayments []*outgoingPayment
// Add fake payments to test database, verifying that it was created.
beforeMigrationFunc := func(d *DB) {
for i := 0; i < numPayments; i++ {
var p *outgoingPayment
var err error
// We fill the database with random payments. For the
// very last one we'll use a duplicate of the first, to
// ensure we are able to handle migration from a
// database that has copies.
if i < numPayments-1 {
p, err = makeRandomFakePayment()
if err != nil {
t.Fatalf("unable to create payment: %v",
err)
}
} else {
p = oldPayments[0]
}
if err := d.addPayment(p); err != nil {
t.Fatalf("unable to add payment: %v", err)
}
oldPayments = append(oldPayments, p)
}
payments, err := d.fetchAllPayments()
if err != nil {
t.Fatalf("unable to fetch payments: %v", err)
}
if len(payments) != numPayments {
t.Fatalf("wrong qty of paymets: expected %d got %v",
numPayments, len(payments))
}
}
// Verify that all payments were migrated.
afterMigrationFunc := func(d *DB) {
meta, err := d.FetchMeta(nil)
if err != nil {
t.Fatal(err)
}
if meta.DbVersionNumber != 1 {
t.Fatal("migration 'paymentStatusesMigration' wasn't applied")
}
sentPayments, err := d.FetchPayments()
if err != nil {
t.Fatalf("unable to fetch sent payments: %v", err)
}
if len(sentPayments) != numPayments {
t.Fatalf("expected %d payments, got %d", numPayments,
len(sentPayments))
}
graph := d.ChannelGraph()
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
for i, p := range sentPayments {
// The payment status should be Completed.
if p.Status != StatusSucceeded {
t.Fatalf("expected Completed, got %v", p.Status)
}
// Check that the sequence number is preserved. They
// start counting at 1.
if p.sequenceNum != uint64(i+1) {
t.Fatalf("expected seqnum %d, got %d", i,
p.sequenceNum)
}
// Order of payments should be be preserved.
old := oldPayments[i]
// Check the individial fields.
if p.Info.Value != old.Terms.Value {
t.Fatalf("value mismatch")
}
if p.Info.CreationDate != old.CreationDate {
t.Fatalf("date mismatch")
}
if !bytes.Equal(p.Info.PaymentRequest, old.PaymentRequest) {
t.Fatalf("payreq mismatch")
}
if *p.PaymentPreimage != old.PaymentPreimage {
t.Fatalf("preimage mismatch")
}
if p.Attempt.Route.TotalFees() != old.Fee {
t.Fatalf("Fee mismatch")
}
if p.Attempt.Route.TotalAmount != old.Fee+old.Terms.Value {
t.Fatalf("Total amount mismatch")
}
if p.Attempt.Route.TotalTimeLock != old.TimeLockLength {
t.Fatalf("timelock mismatch")
}
if p.Attempt.Route.SourcePubKey != sourceNode.PubKeyBytes {
t.Fatalf("source mismatch: %x vs %x",
p.Attempt.Route.SourcePubKey[:],
sourceNode.PubKeyBytes[:])
}
for i, hop := range old.Path {
if hop != p.Attempt.Route.Hops[i].PubKeyBytes {
t.Fatalf("path mismatch")
}
}
}
// Finally, check that the payment sequence number is updated
// to reflect the migrated payments.
err = d.View(func(tx *bbolt.Tx) error {
payments := tx.Bucket(paymentsRootBucket)
if payments == nil {
return fmt.Errorf("payments bucket not found")
}
seq := payments.Sequence()
if seq != numPayments {
return fmt.Errorf("expected sequence to be "+
"%d, got %d", numPayments, seq)
}
return nil
})
if err != nil {
t.Fatal(err)
}
}
applyMigration(t,
beforeMigrationFunc,
afterMigrationFunc,
migrateOutgoingPayments,
false)
}

541
channeldb/payments.go
View File

@ -4,43 +4,118 @@ import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"io"
"sort"
"time"
"github.com/btcsuite/btcd/btcec"
"github.com/coreos/bbolt"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing/route"
)
var (
// paymentBucket is the name of the bucket within the database that
// stores all data related to payments.
// paymentsRootBucket is the name of the top-level bucket within the
// database that stores all data related to payments. Within this
// bucket, each payment hash its own sub-bucket keyed by its payment
// hash.
//
// Within the payments bucket, each invoice is keyed by its invoice ID
// which is a monotonically increasing uint64. BoltDB's sequence
// feature is used for generating monotonically increasing id.
paymentBucket = []byte("payments")
// Bucket hierarchy:
//
// root-bucket
// |
// |-- <paymenthash>
// | |--sequence-key: <sequence number>
// | |--creation-info-key: <creation info>
// | |--attempt-info-key: <attempt info>
// | |--settle-info-key: <settle info>
// | |--fail-info-key: <fail info>
// | |
// | |--duplicate-bucket (only for old, completed payments)
// | |
// | |-- <seq-num>
// | | |--sequence-key: <sequence number>
// | | |--creation-info-key: <creation info>
// | | |--attempt-info-key: <attempt info>
// | | |--settle-info-key: <settle info>
// | | |--fail-info-key: <fail info>
// | |
// | |-- <seq-num>
// | | |
// | ... ...
// |
// |-- <paymenthash>
// | |
// | ...
// ...
//
paymentsRootBucket = []byte("payments-root-bucket")
// paymentStatusBucket is the name of the bucket within the database that
// stores the status of a payment indexed by the payment's preimage.
paymentStatusBucket = []byte("payment-status")
// paymentDublicateBucket is the name of a optional sub-bucket within
// the payment hash bucket, that is used to hold duplicate payments to
// a payment hash. This is needed to support information from earlier
// versions of lnd, where it was possible to pay to a payment hash more
// than once.
paymentDuplicateBucket = []byte("payment-duplicate-bucket")
// paymentSequenceKey is a key used in the payment's sub-bucket to
// store the sequence number of the payment.
paymentSequenceKey = []byte("payment-sequence-key")
// paymentCreationInfoKey is a key used in the payment's sub-bucket to
// store the creation info of the payment.
paymentCreationInfoKey = []byte("payment-creation-info")
// paymentAttemptInfoKey is a key used in the payment's sub-bucket to
// store the info about the latest attempt that was done for the
// payment in question.
paymentAttemptInfoKey = []byte("payment-attempt-info")
// paymentSettleInfoKey is a key used in the payment's sub-bucket to
// store the settle info of the payment.
paymentSettleInfoKey = []byte("payment-settle-info")
// paymentFailInfoKey is a key used in the payment's sub-bucket to
// store information about the reason a payment failed.
paymentFailInfoKey = []byte("payment-fail-info")
)
// FailureReason encodes the reason a payment ultimately failed.
type FailureReason byte
const (
// FailureReasonTimeout indicates that the payment did timeout before a
// successful payment attempt was made.
FailureReasonTimeout FailureReason = 0
// FailureReasonNoRoute indicates no successful route to the
// destination was found during path finding.
FailureReasonNoRoute FailureReason = 1
// TODO(halseth): cancel state.
)
// PaymentStatus represent current status of payment
type PaymentStatus byte
const (
// StatusGrounded is the status where a payment has never been
// initiated, or has been initiated and received an intermittent
// failure.
StatusGrounded PaymentStatus = 0
// StatusUnknown is the status where a payment has never been initiated
// and hence is unknown.
StatusUnknown PaymentStatus = 0
// StatusInFlight is the status where a payment has been initiated, but
// a response has not been received.
StatusInFlight PaymentStatus = 1
// StatusCompleted is the status where a payment has been initiated and
// StatusSucceeded is the status where a payment has been initiated and
// the payment was completed successfully.
StatusCompleted PaymentStatus = 2
StatusSucceeded PaymentStatus = 2
// StatusFailed is the status where a payment has been initiated and a
// failure result has come back.
StatusFailed PaymentStatus = 3
)
// Bytes returns status as slice of bytes.
@ -55,7 +130,7 @@ func (ps *PaymentStatus) FromBytes(status []byte) error {
}
switch PaymentStatus(status[0]) {
case StatusGrounded, StatusInFlight, StatusCompleted:
case StatusUnknown, StatusInFlight, StatusSucceeded, StatusFailed:
*ps = PaymentStatus(status[0])
default:
return errors.New("unknown payment status")
@ -67,267 +142,339 @@ func (ps *PaymentStatus) FromBytes(status []byte) error {
// String returns readable representation of payment status.
func (ps PaymentStatus) String() string {
switch ps {
case StatusGrounded:
return "Grounded"
case StatusUnknown:
return "Unknown"
case StatusInFlight:
return "In Flight"
case StatusCompleted:
return "Completed"
case StatusSucceeded:
return "Succeeded"
case StatusFailed:
return "Failed"
default:
return "Unknown"
}
}
// OutgoingPayment represents a successful payment between the daemon and a
// remote node. Details such as the total fee paid, and the time of the payment
// are stored.
type OutgoingPayment struct {
Invoice
// PaymentCreationInfo is the information necessary to have ready when
// initiating a payment, moving it into state InFlight.
type PaymentCreationInfo struct {
// PaymentHash is the hash this payment is paying to.
PaymentHash lntypes.Hash
// Fee is the total fee paid for the payment in milli-satoshis.
Fee lnwire.MilliSatoshi
// Value is the amount we are paying.
Value lnwire.MilliSatoshi
// TotalTimeLock is the total cumulative time-lock in the HTLC extended
// from the second-to-last hop to the destination.
TimeLockLength uint32
// CreatingDate is the time when this payment was initiated.
CreationDate time.Time
// Path encodes the path the payment took through the network. The path
// excludes the outgoing node and consists of the hex-encoded
// compressed public key of each of the nodes involved in the payment.
Path [][33]byte
// PaymentPreimage is the preImage of a successful payment. This is used
// to calculate the PaymentHash as well as serve as a proof of payment.
PaymentPreimage [32]byte
// PaymentRequest is the full payment request, if any.
PaymentRequest []byte
}
// AddPayment saves a successful payment to the database. It is assumed that
// all payment are sent using unique payment hashes.
func (db *DB) AddPayment(payment *OutgoingPayment) error {
// Validate the field of the inner voice within the outgoing payment,
// these must also adhere to the same constraints as regular invoices.
if err := validateInvoice(&payment.Invoice); err != nil {
return err
}
// PaymentAttemptInfo contains information about a specific payment attempt for
// a given payment. This information is used by the router to handle any errors
// coming back after an attempt is made, and to query the switch about the
// status of a payment. For settled payment this will be the information for
// the succeeding payment attempt.
type PaymentAttemptInfo struct {
// PaymentID is the unique ID used for this attempt.
PaymentID uint64
// We first serialize the payment before starting the database
// transaction so we can avoid creating a DB payment in the case of a
// serialization error.
var b bytes.Buffer
if err := serializeOutgoingPayment(&b, payment); err != nil {
return err
}
paymentBytes := b.Bytes()
// SessionKey is the ephemeral key used for this payment attempt.
SessionKey *btcec.PrivateKey
return db.Batch(func(tx *bbolt.Tx) error {
payments, err := tx.CreateBucketIfNotExists(paymentBucket)
if err != nil {
return err
}
// Obtain the new unique sequence number for this payment.
paymentID, err := payments.NextSequence()
if err != nil {
return err
}
// We use BigEndian for keys as it orders keys in
// ascending order. This allows bucket scans to order payments
// in the order in which they were created.
paymentIDBytes := make([]byte, 8)
binary.BigEndian.PutUint64(paymentIDBytes, paymentID)
return payments.Put(paymentIDBytes, paymentBytes)
})
// Route is the route attempted to send the HTLC.
Route route.Route
}
// FetchAllPayments returns all outgoing payments in DB.
func (db *DB) FetchAllPayments() ([]*OutgoingPayment, error) {
var payments []*OutgoingPayment
// Payment is a wrapper around a payment's PaymentCreationInfo,
// PaymentAttemptInfo, and preimage. All payments will have the
// PaymentCreationInfo set, the PaymentAttemptInfo will be set only if at least
// one payment attempt has been made, while only completed payments will have a
// non-zero payment preimage.
type Payment struct {
// sequenceNum is a unique identifier used to sort the payments in
// order of creation.
sequenceNum uint64
// Status is the current PaymentStatus of this payment.
Status PaymentStatus
// Info holds all static information about this payment, and is
// populated when the payment is initiated.
Info *PaymentCreationInfo
// Attempt is the information about the last payment attempt made.
//
// NOTE: Can be nil if no attempt is yet made.
Attempt *PaymentAttemptInfo
// PaymentPreimage is the preimage of a successful payment. This serves
// as a proof of payment. It will only be non-nil for settled payments.
//
// NOTE: Can be nil if payment is not settled.
PaymentPreimage *lntypes.Preimage
// Failure is a failure reason code indicating the reason the payment
// failed. It is only non-nil for failed payments.
//
// NOTE: Can be nil if payment is not failed.
Failure *FailureReason
}
// FetchPayments returns all sent payments found in the DB.
func (db *DB) FetchPayments() ([]*Payment, error) {
var payments []*Payment
err := db.View(func(tx *bbolt.Tx) error {
bucket := tx.Bucket(paymentBucket)
if bucket == nil {
return ErrNoPaymentsCreated
paymentsBucket := tx.Bucket(paymentsRootBucket)
if paymentsBucket == nil {
return nil
}
return bucket.ForEach(func(k, v []byte) error {
// If the value is nil, then we ignore it as it may be
// a sub-bucket.
if v == nil {
return nil
return paymentsBucket.ForEach(func(k, v []byte) error {
bucket := paymentsBucket.Bucket(k)
if bucket == nil {
// We only expect sub-buckets to be found in
// this top-level bucket.
return fmt.Errorf("non bucket element in " +
"payments bucket")
}
r := bytes.NewReader(v)
payment, err := deserializeOutgoingPayment(r)
p, err := fetchPayment(bucket)
if err != nil {
return err
}
payments = append(payments, payment)
return nil
payments = append(payments, p)
// For older versions of lnd, duplicate payments to a
// payment has was possible. These will be found in a
// sub-bucket indexed by their sequence number if
// available.
dup := bucket.Bucket(paymentDuplicateBucket)
if dup == nil {
return nil
}
return dup.ForEach(func(k, v []byte) error {
subBucket := dup.Bucket(k)
if subBucket == nil {
// We one bucket for each duplicate to
// be found.
return fmt.Errorf("non bucket element" +
"in duplicate bucket")
}
p, err := fetchPayment(subBucket)
if err != nil {
return err
}
payments = append(payments, p)
return nil
})
})
})
if err != nil {
return nil, err
}
// Before returning, sort the payments by their sequence number.
sort.Slice(payments, func(i, j int) bool {
return payments[i].sequenceNum < payments[j].sequenceNum
})
return payments, nil
}
// DeleteAllPayments deletes all payments from DB.
func (db *DB) DeleteAllPayments() error {
func fetchPayment(bucket *bbolt.Bucket) (*Payment, error) {
var (
err error
p = &Payment{}
)
seqBytes := bucket.Get(paymentSequenceKey)
if seqBytes == nil {
return nil, fmt.Errorf("sequence number not found")
}
p.sequenceNum = binary.BigEndian.Uint64(seqBytes)
// Get the payment status.
p.Status = fetchPaymentStatus(bucket)
// Get the PaymentCreationInfo.
b := bucket.Get(paymentCreationInfoKey)
if b == nil {
return nil, fmt.Errorf("creation info not found")
}
r := bytes.NewReader(b)
p.Info, err = deserializePaymentCreationInfo(r)
if err != nil {
return nil, err
}
// Get the PaymentAttemptInfo. This can be unset.
b = bucket.Get(paymentAttemptInfoKey)
if b != nil {
r = bytes.NewReader(b)
p.Attempt, err = deserializePaymentAttemptInfo(r)
if err != nil {
return nil, err
}
}
// Get the payment preimage. This is only found for
// completed payments.
b = bucket.Get(paymentSettleInfoKey)
if b != nil {
var preimg lntypes.Preimage
copy(preimg[:], b[:])
p.PaymentPreimage = &preimg
}
// Get failure reason if available.
b = bucket.Get(paymentFailInfoKey)
if b != nil {
reason := FailureReason(b[0])
p.Failure = &reason
}
return p, nil
}
// DeletePayments deletes all completed and failed payments from the DB.
func (db *DB) DeletePayments() error {
return db.Update(func(tx *bbolt.Tx) error {
err := tx.DeleteBucket(paymentBucket)
if err != nil && err != bbolt.ErrBucketNotFound {
payments := tx.Bucket(paymentsRootBucket)
if payments == nil {
return nil
}
var deleteBuckets [][]byte
err := payments.ForEach(func(k, _ []byte) error {
bucket := payments.Bucket(k)
if bucket == nil {
// We only expect sub-buckets to be found in
// this top-level bucket.
return fmt.Errorf("non bucket element in " +
"payments bucket")
}
// If the status is InFlight, we cannot safely delete
// the payment information, so we return early.
paymentStatus := fetchPaymentStatus(bucket)
if paymentStatus == StatusInFlight {
return nil
}
deleteBuckets = append(deleteBuckets, k)
return nil
})
if err != nil {
return err
}
_, err = tx.CreateBucket(paymentBucket)
return err
for _, k := range deleteBuckets {
if err := payments.DeleteBucket(k); err != nil {
return err
}
}
return nil
})
}
// UpdatePaymentStatus sets the payment status for outgoing/finished payments in
// local database.
func (db *DB) UpdatePaymentStatus(paymentHash [32]byte, status PaymentStatus) error {
return db.Batch(func(tx *bbolt.Tx) error {
return UpdatePaymentStatusTx(tx, paymentHash, status)
})
}
// UpdatePaymentStatusTx is a helper method that sets the payment status for
// outgoing/finished payments in the local database. This method accepts a
// boltdb transaction such that the operation can be composed into other
// database transactions.
func UpdatePaymentStatusTx(tx *bbolt.Tx,
paymentHash [32]byte, status PaymentStatus) error {
paymentStatuses, err := tx.CreateBucketIfNotExists(paymentStatusBucket)
if err != nil {
return err
}
return paymentStatuses.Put(paymentHash[:], status.Bytes())
}
// FetchPaymentStatus returns the payment status for outgoing payment.
// If status of the payment isn't found, it will default to "StatusGrounded".
func (db *DB) FetchPaymentStatus(paymentHash [32]byte) (PaymentStatus, error) {
var paymentStatus = StatusGrounded
err := db.View(func(tx *bbolt.Tx) error {
var err error
paymentStatus, err = FetchPaymentStatusTx(tx, paymentHash)
return err
})
if err != nil {
return StatusGrounded, err
}
return paymentStatus, nil
}
// FetchPaymentStatusTx is a helper method that returns the payment status for
// outgoing payment. If status of the payment isn't found, it will default to
// "StatusGrounded". It accepts the boltdb transactions such that this method
// can be composed into other atomic operations.
func FetchPaymentStatusTx(tx *bbolt.Tx, paymentHash [32]byte) (PaymentStatus, error) {
// The default status for all payments that aren't recorded in database.
var paymentStatus = StatusGrounded
bucket := tx.Bucket(paymentStatusBucket)
if bucket == nil {
return paymentStatus, nil
}
paymentStatusBytes := bucket.Get(paymentHash[:])
if paymentStatusBytes == nil {
return paymentStatus, nil
}
paymentStatus.FromBytes(paymentStatusBytes)
return paymentStatus, nil
}
func serializeOutgoingPayment(w io.Writer, p *OutgoingPayment) error {
func serializePaymentCreationInfo(w io.Writer, c *PaymentCreationInfo) error {
var scratch [8]byte
if err := serializeInvoice(w, &p.Invoice); err != nil {
if _, err := w.Write(c.PaymentHash[:]); err != nil {
return err
}
byteOrder.PutUint64(scratch[:], uint64(p.Fee))
byteOrder.PutUint64(scratch[:], uint64(c.Value))
if _, err := w.Write(scratch[:]); err != nil {
return err
}
// First write out the length of the bytes to prefix the value.
pathLen := uint32(len(p.Path))
byteOrder.PutUint32(scratch[:4], pathLen)
byteOrder.PutUint64(scratch[:], uint64(c.CreationDate.Unix()))
if _, err := w.Write(scratch[:]); err != nil {
return err
}
byteOrder.PutUint32(scratch[:4], uint32(len(c.PaymentRequest)))
if _, err := w.Write(scratch[:4]); err != nil {
return err
}
// Then with the path written, we write out the series of public keys
// involved in the path.
for _, hop := range p.Path {
if _, err := w.Write(hop[:]); err != nil {
return err
}
}
byteOrder.PutUint32(scratch[:4], p.TimeLockLength)
if _, err := w.Write(scratch[:4]); err != nil {
return err
}
if _, err := w.Write(p.PaymentPreimage[:]); err != nil {
if _, err := w.Write(c.PaymentRequest[:]); err != nil {
return err
}
return nil
}
func deserializeOutgoingPayment(r io.Reader) (*OutgoingPayment, error) {
func deserializePaymentCreationInfo(r io.Reader) (*PaymentCreationInfo, error) {
var scratch [8]byte
p := &OutgoingPayment{}
c := &PaymentCreationInfo{}
inv, err := deserializeInvoice(r)
if err != nil {
if _, err := io.ReadFull(r, c.PaymentHash[:]); err != nil {
return nil, err
}
p.Invoice = inv
if _, err := r.Read(scratch[:]); err != nil {
if _, err := io.ReadFull(r, scratch[:]); err != nil {
return nil, err
}
p.Fee = lnwire.MilliSatoshi(byteOrder.Uint64(scratch[:]))
c.Value = lnwire.MilliSatoshi(byteOrder.Uint64(scratch[:]))
if _, err = r.Read(scratch[:4]); err != nil {
if _, err := io.ReadFull(r, scratch[:]); err != nil {
return nil, err
}
pathLen := byteOrder.Uint32(scratch[:4])
c.CreationDate = time.Unix(int64(byteOrder.Uint64(scratch[:])), 0)
path := make([][33]byte, pathLen)
for i := uint32(0); i < pathLen; i++ {
if _, err := r.Read(path[i][:]); err != nil {
if _, err := io.ReadFull(r, scratch[:4]); err != nil {
return nil, err
}
reqLen := uint32(byteOrder.Uint32(scratch[:4]))
payReq := make([]byte, reqLen)
if reqLen > 0 {
if _, err := io.ReadFull(r, payReq[:]); err != nil {
return nil, err
}
}
p.Path = path
c.PaymentRequest = payReq
if _, err = r.Read(scratch[:4]); err != nil {
return nil, err
}
p.TimeLockLength = byteOrder.Uint32(scratch[:4])
return c, nil
}
if _, err := r.Read(p.PaymentPreimage[:]); err != nil {
return nil, err
func serializePaymentAttemptInfo(w io.Writer, a *PaymentAttemptInfo) error {
if err := WriteElements(w, a.PaymentID, a.SessionKey); err != nil {
return err
}
return p, nil
if err := serializeRoute(w, a.Route); err != nil {
return err
}
return nil
}
func deserializePaymentAttemptInfo(r io.Reader) (*PaymentAttemptInfo, error) {
a := &PaymentAttemptInfo{}
err := ReadElements(r, &a.PaymentID, &a.SessionKey)
if err != nil {
return nil, err
}
a.Route, err = deserializeRoute(r)
if err != nil {
return nil, err
}
return a, nil
}
func serializeHop(w io.Writer, h *route.Hop) error {

171
channeldb/payments_test.go
View File

@ -10,6 +10,7 @@ import (
"github.com/btcsuite/btcd/btcec"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing/route"
)
@ -36,7 +37,7 @@ var (
}
)
func makeFakePayment() *OutgoingPayment {
func makeFakePayment() *outgoingPayment {
fakeInvoice := &Invoice{
// Use single second precision to avoid false positive test
// failures due to the monotonic time component.
@ -54,7 +55,7 @@ func makeFakePayment() *OutgoingPayment {
copy(fakePath[i][:], bytes.Repeat([]byte{byte(i)}, 33))
}
fakePayment := &OutgoingPayment{
fakePayment := &outgoingPayment{
Invoice: *fakeInvoice,
Fee: 101,
Path: fakePath,
@ -64,6 +65,27 @@ func makeFakePayment() *OutgoingPayment {
return fakePayment
}
func makeFakeInfo() (*PaymentCreationInfo, *PaymentAttemptInfo) {
var preimg lntypes.Preimage
copy(preimg[:], rev[:])
c := &PaymentCreationInfo{
PaymentHash: preimg.Hash(),
Value: 1000,
// Use single second precision to avoid false positive test
// failures due to the monotonic time component.
CreationDate: time.Unix(time.Now().Unix(), 0),
PaymentRequest: []byte(""),
}
a := &PaymentAttemptInfo{
PaymentID: 44,
SessionKey: priv,
Route: testRoute,
}
return c, a
}
func makeFakePaymentHash() [32]byte {
var paymentHash [32]byte
rBytes, _ := randomBytes(0, 32)
@ -84,7 +106,7 @@ func randomBytes(minLen, maxLen int) ([]byte, error) {
return randBuf, nil
}
func makeRandomFakePayment() (*OutgoingPayment, error) {
func makeRandomFakePayment() (*outgoingPayment, error) {
var err error
fakeInvoice := &Invoice{
// Use single second precision to avoid false positive test
@ -102,7 +124,10 @@ func makeRandomFakePayment() (*OutgoingPayment, error) {
return nil, err
}
fakeInvoice.PaymentRequest = []byte("")
fakeInvoice.PaymentRequest, err = randomBytes(1, 50)
if err != nil {
return nil, err
}
preImg, err := randomBytes(32, 33)
if err != nil {
@ -122,7 +147,7 @@ func makeRandomFakePayment() (*OutgoingPayment, error) {
copy(fakePath[i][:], b)
}
fakePayment := &OutgoingPayment{
fakePayment := &outgoingPayment{
Invoice: *fakeInvoice,
Fee: lnwire.MilliSatoshi(rand.Intn(1001)),
Path: fakePath,
@ -133,147 +158,45 @@ func makeRandomFakePayment() (*OutgoingPayment, error) {
return fakePayment, nil
}
func TestOutgoingPaymentSerialization(t *testing.T) {
func TestSentPaymentSerialization(t *testing.T) {
t.Parallel()
fakePayment := makeFakePayment()
c, s := makeFakeInfo()
var b bytes.Buffer
if err := serializeOutgoingPayment(&b, fakePayment); err != nil {
t.Fatalf("unable to serialize outgoing payment: %v", err)
if err := serializePaymentCreationInfo(&b, c); err != nil {
t.Fatalf("unable to serialize creation info: %v", err)
}
newPayment, err := deserializeOutgoingPayment(&b)
newCreationInfo, err := deserializePaymentCreationInfo(&b)
if err != nil {
t.Fatalf("unable to deserialize outgoing payment: %v", err)
t.Fatalf("unable to deserialize creation info: %v", err)
}
if !reflect.DeepEqual(fakePayment, newPayment) {
if !reflect.DeepEqual(c, newCreationInfo) {
t.Fatalf("Payments do not match after "+
"serialization/deserialization %v vs %v",
spew.Sdump(fakePayment),
spew.Sdump(newPayment),
)
}
}
func TestOutgoingPaymentWorkflow(t *testing.T) {
t.Parallel()
db, cleanUp, err := makeTestDB()
defer cleanUp()
if err != nil {
t.Fatalf("unable to make test db: %v", err)
}
fakePayment := makeFakePayment()
if err = db.AddPayment(fakePayment); err != nil {
t.Fatalf("unable to put payment in DB: %v", err)
}
payments, err := db.FetchAllPayments()
if err != nil {
t.Fatalf("unable to fetch payments from DB: %v", err)
}
expectedPayments := []*OutgoingPayment{fakePayment}
if !reflect.DeepEqual(payments, expectedPayments) {
t.Fatalf("Wrong payments after reading from DB."+
"Got %v, want %v",
spew.Sdump(payments),
spew.Sdump(expectedPayments),
spew.Sdump(c), spew.Sdump(newCreationInfo),
)
}
// Make some random payments
for i := 0; i < 5; i++ {
randomPayment, err := makeRandomFakePayment()
if err != nil {
t.Fatalf("Internal error in tests: %v", err)
}
if err = db.AddPayment(randomPayment); err != nil {
t.Fatalf("unable to put payment in DB: %v", err)
}
expectedPayments = append(expectedPayments, randomPayment)
b.Reset()
if err := serializePaymentAttemptInfo(&b, s); err != nil {
t.Fatalf("unable to serialize info: %v", err)
}
payments, err = db.FetchAllPayments()
newAttemptInfo, err := deserializePaymentAttemptInfo(&b)
if err != nil {
t.Fatalf("Can't get payments from DB: %v", err)
t.Fatalf("unable to deserialize info: %v", err)
}
if !reflect.DeepEqual(payments, expectedPayments) {
t.Fatalf("Wrong payments after reading from DB."+
"Got %v, want %v",
spew.Sdump(payments),
spew.Sdump(expectedPayments),
if !reflect.DeepEqual(s, newAttemptInfo) {
t.Fatalf("Payments do not match after "+
"serialization/deserialization %v vs %v",
spew.Sdump(s), spew.Sdump(newAttemptInfo),
)
}
// Delete all payments.
if err = db.DeleteAllPayments(); err != nil {
t.Fatalf("unable to delete payments from DB: %v", err)
}
// Check that there is no payments after deletion
paymentsAfterDeletion, err := db.FetchAllPayments()
if err != nil {
t.Fatalf("Can't get payments after deletion: %v", err)
}
if len(paymentsAfterDeletion) != 0 {
t.Fatalf("After deletion DB has %v payments, want %v",
len(paymentsAfterDeletion), 0)
}
}
func TestPaymentStatusWorkflow(t *testing.T) {
t.Parallel()
db, cleanUp, err := makeTestDB()
defer cleanUp()
if err != nil {
t.Fatalf("unable to make test db: %v", err)
}
testCases := []struct {
paymentHash [32]byte
status PaymentStatus
}{
{
paymentHash: makeFakePaymentHash(),
status: StatusGrounded,
},
{
paymentHash: makeFakePaymentHash(),
status: StatusInFlight,
},
{
paymentHash: makeFakePaymentHash(),
status: StatusCompleted,
},
}
for _, testCase := range testCases {
err := db.UpdatePaymentStatus(testCase.paymentHash, testCase.status)
if err != nil {
t.Fatalf("unable to put payment in DB: %v", err)
}
status, err := db.FetchPaymentStatus(testCase.paymentHash)
if err != nil {
t.Fatalf("unable to fetch payments from DB: %v", err)
}
if status != testCase.status {
t.Fatalf("Wrong payments status after reading from DB."+
"Got %v, want %v",
spew.Sdump(status),
spew.Sdump(testCase.status),
)
}
}
}
func TestRouteSerialization(t *testing.T) {

245
htlcswitch/control_tower.go
View File

@ -1,245 +0,0 @@
package htlcswitch
import (
"errors"
"github.com/coreos/bbolt"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnwire"
)
var (
// ErrAlreadyPaid signals we have already paid this payment hash.
ErrAlreadyPaid = errors.New("invoice is already paid")
// ErrPaymentInFlight signals that payment for this payment hash is
// already "in flight" on the network.
ErrPaymentInFlight = errors.New("payment is in transition")
// ErrPaymentNotInitiated is returned if payment wasn't initiated in
// switch.
ErrPaymentNotInitiated = errors.New("payment isn't initiated")
// ErrPaymentAlreadyCompleted is returned in the event we attempt to
// recomplete a completed payment.
ErrPaymentAlreadyCompleted = errors.New("payment is already completed")
// ErrUnknownPaymentStatus is returned when we do not recognize the
// existing state of a payment.
ErrUnknownPaymentStatus = errors.New("unknown payment status")
)
// ControlTower tracks all outgoing payments made by the switch, whose primary
// purpose is to prevent duplicate payments to the same payment hash. In
// production, a persistent implementation is preferred so that tracking can
// survive across restarts. Payments are transition through various payment
// states, and the ControlTower interface provides access to driving the state
// transitions.
type ControlTower interface {
// ClearForTakeoff atomically checks that no inflight or completed
// payments exist for this payment hash. If none are found, this method
// atomically transitions the status for this payment hash as InFlight.
ClearForTakeoff(htlc *lnwire.UpdateAddHTLC) error
// Success transitions an InFlight payment into a Completed payment.
// After invoking this method, ClearForTakeoff should always return an
// error to prevent us from making duplicate payments to the same
// payment hash.
Success(paymentHash [32]byte) error
// Fail transitions an InFlight payment into a Grounded Payment. After
// invoking this method, ClearForTakeoff should return nil on its next
// call for this payment hash, allowing the switch to make a subsequent
// payment.
Fail(paymentHash [32]byte) error
}
// paymentControl is persistent implementation of ControlTower to restrict
// double payment sending.
type paymentControl struct {
strict bool
db *channeldb.DB
}
// NewPaymentControl creates a new instance of the paymentControl. The strict
// flag indicates whether the controller should require "strict" state
// transitions, which would be otherwise intolerant to older databases that may
// already have duplicate payments to the same payment hash. It should be
// enabled only after sufficient checks have been made to ensure the db does not
// contain such payments. In the meantime, non-strict mode enforces a superset
// of the state transitions that prevent additional payments to a given payment
// hash from being added.
func NewPaymentControl(strict bool, db *channeldb.DB) ControlTower {
return &paymentControl{
strict: strict,
db: db,
}
}
// ClearForTakeoff checks that we don't already have an InFlight or Completed
// payment identified by the same payment hash.
func (p *paymentControl) ClearForTakeoff(htlc *lnwire.UpdateAddHTLC) error {
var takeoffErr error
err := p.db.Batch(func(tx *bbolt.Tx) error {
// Retrieve current status of payment from local database.
paymentStatus, err := channeldb.FetchPaymentStatusTx(
tx, htlc.PaymentHash,
)
if err != nil {
return err
}
// Reset the takeoff error, to avoid carrying over an error
// from a previous execution of the batched db transaction.
takeoffErr = nil
switch paymentStatus {
case channeldb.StatusGrounded:
// It is safe to reattempt a payment if we know that we
// haven't left one in flight. Since this one is
// grounded, Transition the payment status to InFlight
// to prevent others.
return channeldb.UpdatePaymentStatusTx(
tx, htlc.PaymentHash, channeldb.StatusInFlight,
)
case channeldb.StatusInFlight:
// We already have an InFlight payment on the network. We will
// disallow any more payment until a response is received.
takeoffErr = ErrPaymentInFlight
case channeldb.StatusCompleted:
// We've already completed a payment to this payment hash,
// forbid the switch from sending another.
takeoffErr = ErrAlreadyPaid
default:
takeoffErr = ErrUnknownPaymentStatus
}
return nil
})
if err != nil {
return err
}
return takeoffErr
}
// Success transitions an InFlight payment to Completed, otherwise it returns an
// error. After calling Success, ClearForTakeoff should prevent any further
// attempts for the same payment hash.
func (p *paymentControl) Success(paymentHash [32]byte) error {
var updateErr error
err := p.db.Batch(func(tx *bbolt.Tx) error {
paymentStatus, err := channeldb.FetchPaymentStatusTx(
tx, paymentHash,
)
if err != nil {
return err
}
// Reset the update error, to avoid carrying over an error
// from a previous execution of the batched db transaction.
updateErr = nil
switch {
case paymentStatus == channeldb.StatusGrounded && p.strict:
// Our records show the payment as still being grounded,
// meaning it never should have left the switch.
updateErr = ErrPaymentNotInitiated
case paymentStatus == channeldb.StatusGrounded && !p.strict:
// Though our records show the payment as still being
// grounded, meaning it never should have left the
// switch, we permit this transition in non-strict mode
// to handle inconsistent db states.
fallthrough
case paymentStatus == channeldb.StatusInFlight:
// A successful response was received for an InFlight
// payment, mark it as completed to prevent sending to
// this payment hash again.
return channeldb.UpdatePaymentStatusTx(
tx, paymentHash, channeldb.StatusCompleted,
)
case paymentStatus == channeldb.StatusCompleted:
// The payment was completed previously, alert the
// caller that this may be a duplicate call.
updateErr = ErrPaymentAlreadyCompleted
default:
updateErr = ErrUnknownPaymentStatus
}
return nil
})
if err != nil {
return err
}
return updateErr
}
// Fail transitions an InFlight payment to Grounded, otherwise it returns an
// error. After calling Fail, ClearForTakeoff should fail any further attempts
// for the same payment hash.
func (p *paymentControl) Fail(paymentHash [32]byte) error {
var updateErr error
err := p.db.Batch(func(tx *bbolt.Tx) error {
paymentStatus, err := channeldb.FetchPaymentStatusTx(
tx, paymentHash,
)
if err != nil {
return err
}
// Reset the update error, to avoid carrying over an error
// from a previous execution of the batched db transaction.
updateErr = nil
switch {
case paymentStatus == channeldb.StatusGrounded && p.strict:
// Our records show the payment as still being grounded,
// meaning it never should have left the switch.
updateErr = ErrPaymentNotInitiated
case paymentStatus == channeldb.StatusGrounded && !p.strict:
// Though our records show the payment as still being
// grounded, meaning it never should have left the
// switch, we permit this transition in non-strict mode
// to handle inconsistent db states.
fallthrough
case paymentStatus == channeldb.StatusInFlight:
// A failed response was received for an InFlight
// payment, mark it as Grounded again to allow
// subsequent attempts.
return channeldb.UpdatePaymentStatusTx(
tx, paymentHash, channeldb.StatusGrounded,
)
case paymentStatus == channeldb.StatusCompleted:
// The payment was completed previously, and we are now
// reporting that it has failed. Leave the status as
// completed, but alert the user that something is
// wrong.
updateErr = ErrPaymentAlreadyCompleted
default:
updateErr = ErrUnknownPaymentStatus
}
return nil
})
if err != nil {
return err
}
return updateErr
}

351
htlcswitch/control_tower_test.go
View File

@ -1,351 +0,0 @@
package htlcswitch
import (
"fmt"
"testing"
"github.com/btcsuite/fastsha256"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnwire"
)
func genHtlc() (*lnwire.UpdateAddHTLC, error) {
preimage, err := genPreimage()
if err != nil {
return nil, fmt.Errorf("unable to generate preimage: %v", err)
}
rhash := fastsha256.Sum256(preimage[:])
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: 1,
}
return htlc, nil
}
type paymentControlTestCase func(*testing.T, bool)
var paymentControlTests = []struct {
name string
strict bool
testcase paymentControlTestCase
}{
{
name: "fail-strict",
strict: true,
testcase: testPaymentControlSwitchFail,
},
{
name: "double-send-strict",
strict: true,
testcase: testPaymentControlSwitchDoubleSend,
},
{
name: "double-pay-strict",
strict: true,
testcase: testPaymentControlSwitchDoublePay,
},
{
name: "fail-not-strict",
strict: false,
testcase: testPaymentControlSwitchFail,
},
{
name: "double-send-not-strict",
strict: false,
testcase: testPaymentControlSwitchDoubleSend,
},
{
name: "double-pay-not-strict",
strict: false,
testcase: testPaymentControlSwitchDoublePay,
},
}
// TestPaymentControls runs a set of common tests against both the strict and
// non-strict payment control instances. This ensures that the two both behave
// identically when making the expected state-transitions of the stricter
// implementation. Behavioral differences in the strict and non-strict
// implementations are tested separately.
func TestPaymentControls(t *testing.T) {
for _, test := range paymentControlTests {
t.Run(test.name, func(t *testing.T) {
test.testcase(t, test.strict)
})
}
}
// testPaymentControlSwitchFail checks that payment status returns to Grounded
// status after failing, and that ClearForTakeoff allows another HTLC for the
// same payment hash.
func testPaymentControlSwitchFail(t *testing.T, strict bool) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(strict, db)
htlc, err := genHtlc()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Sends base htlc message which initiate StatusInFlight.
if err := pControl.ClearForTakeoff(htlc); err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusInFlight)
// Fail the payment, which should moved it to Grounded.
if err := pControl.Fail(htlc.PaymentHash); err != nil {
t.Fatalf("unable to fail payment hash: %v", err)
}
// Verify the status is indeed Grounded.
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusGrounded)
// Sends the htlc again, which should succeed since the prior payment
// failed.
if err := pControl.ClearForTakeoff(htlc); err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusInFlight)
// Verifies that status was changed to StatusCompleted.
if err := pControl.Success(htlc.PaymentHash); err != nil {
t.Fatalf("error shouldn't have been received, got: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusCompleted)
// Attempt a final payment, which should now fail since the prior
// payment succeed.
if err := pControl.ClearForTakeoff(htlc); err != ErrAlreadyPaid {
t.Fatalf("unable to send htlc message: %v", err)
}
}
// testPaymentControlSwitchDoubleSend checks the ability of payment control to
// prevent double sending of htlc message, when message is in StatusInFlight.
func testPaymentControlSwitchDoubleSend(t *testing.T, strict bool) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(strict, db)
htlc, err := genHtlc()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Sends base htlc message which initiate base status and move it to
// StatusInFlight and verifies that it was changed.
if err := pControl.ClearForTakeoff(htlc); err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusInFlight)
// Try to initiate double sending of htlc message with the same
// payment hash, should result in error indicating that payment has
// already been sent.
if err := pControl.ClearForTakeoff(htlc); err != ErrPaymentInFlight {
t.Fatalf("payment control wrong behaviour: " +
"double sending must trigger ErrPaymentInFlight error")
}
}
// TestPaymentControlSwitchDoublePay checks the ability of payment control to
// prevent double payment.
func testPaymentControlSwitchDoublePay(t *testing.T, strict bool) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(strict, db)
htlc, err := genHtlc()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
// Sends base htlc message which initiate StatusInFlight.
if err := pControl.ClearForTakeoff(htlc); err != nil {
t.Fatalf("unable to send htlc message: %v", err)
}
// Verify that payment is InFlight.
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusInFlight)
// Move payment to completed status, second payment should return error.
if err := pControl.Success(htlc.PaymentHash); err != nil {
t.Fatalf("error shouldn't have been received, got: %v", err)
}
// Verify that payment is Completed.
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusCompleted)
if err := pControl.ClearForTakeoff(htlc); err != ErrAlreadyPaid {
t.Fatalf("payment control wrong behaviour:" +
" double payment must trigger ErrAlreadyPaid")
}
}
// TestPaymentControlNonStrictSuccessesWithoutInFlight checks that a non-strict
// payment control will allow calls to Success when no payment is in flight. This
// is necessary to gracefully handle the case in which the switch already sent
// out a payment for a particular payment hash in a prior db version that didn't
// have payment statuses.
func TestPaymentControlNonStrictSuccessesWithoutInFlight(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(false, db)
htlc, err := genHtlc()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
if err := pControl.Success(htlc.PaymentHash); err != nil {
t.Fatalf("unable to mark payment hash success: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusCompleted)
err = pControl.Success(htlc.PaymentHash)
if err != ErrPaymentAlreadyCompleted {
t.Fatalf("unable to remark payment hash failed: %v", err)
}
}
// TestPaymentControlNonStrictFailsWithoutInFlight checks that a non-strict
// payment control will allow calls to Fail when no payment is in flight. This
// is necessary to gracefully handle the case in which the switch already sent
// out a payment for a particular payment hash in a prior db version that didn't
// have payment statuses.
func TestPaymentControlNonStrictFailsWithoutInFlight(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(false, db)
htlc, err := genHtlc()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
if err := pControl.Fail(htlc.PaymentHash); err != nil {
t.Fatalf("unable to mark payment hash failed: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusGrounded)
err = pControl.Fail(htlc.PaymentHash)
if err != nil {
t.Fatalf("unable to remark payment hash failed: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusGrounded)
err = pControl.Success(htlc.PaymentHash)
if err != nil {
t.Fatalf("unable to remark payment hash success: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusCompleted)
err = pControl.Fail(htlc.PaymentHash)
if err != ErrPaymentAlreadyCompleted {
t.Fatalf("unable to remark payment hash failed: %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusCompleted)
}
// TestPaymentControlStrictSuccessesWithoutInFlight checks that a strict payment
// control will disallow calls to Success when no payment is in flight.
func TestPaymentControlStrictSuccessesWithoutInFlight(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(true, db)
htlc, err := genHtlc()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
err = pControl.Success(htlc.PaymentHash)
if err != ErrPaymentNotInitiated {
t.Fatalf("expected ErrPaymentNotInitiated, got %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusGrounded)
}
// TestPaymentControlStrictFailsWithoutInFlight checks that a strict payment
// control will disallow calls to Fail when no payment is in flight.
func TestPaymentControlStrictFailsWithoutInFlight(t *testing.T) {
t.Parallel()
db, err := initDB()
if err != nil {
t.Fatalf("unable to init db: %v", err)
}
pControl := NewPaymentControl(true, db)
htlc, err := genHtlc()
if err != nil {
t.Fatalf("unable to generate htlc message: %v", err)
}
err = pControl.Fail(htlc.PaymentHash)
if err != ErrPaymentNotInitiated {
t.Fatalf("expected ErrPaymentNotInitiated, got %v", err)
}
assertPaymentStatus(t, db, htlc.PaymentHash, channeldb.StatusGrounded)
}
func assertPaymentStatus(t *testing.T, db *channeldb.DB,
hash [32]byte, expStatus channeldb.PaymentStatus) {
t.Helper()
pStatus, err := db.FetchPaymentStatus(hash)
if err != nil {
t.Fatalf("unable to fetch payment status: %v", err)
}
if pStatus != expStatus {
t.Fatalf("payment status mismatch: expected %v, got %v",
expStatus, pStatus)
}
}

22
htlcswitch/link_test.go
View File

@ -3889,8 +3889,7 @@ func TestChannelLinkAcceptDuplicatePayment(t *testing.T) {
}
// With the invoice now added to Carol's registry, we'll send the
// payment. It should succeed w/o any issues as it has been crafted
// properly.
// payment.
err = n.aliceServer.htlcSwitch.SendHTLC(
n.firstBobChannelLink.ShortChanID(), pid, htlc,
)
@ -3905,6 +3904,16 @@ func TestChannelLinkAcceptDuplicatePayment(t *testing.T) {
t.Fatalf("unable to get payment result: %v", err)
}
// Now, if we attempt to send the payment *again* it should be rejected
// as it's a duplicate request.
err = n.aliceServer.htlcSwitch.SendHTLC(
n.firstBobChannelLink.ShortChanID(), pid, htlc,
)
if err != ErrPaymentIDAlreadyExists {
t.Fatalf("ErrPaymentIDAlreadyExists should have been "+
"received got: %v", err)
}
select {
case result, ok := <-resultChan:
if !ok {
@ -3917,15 +3926,6 @@ func TestChannelLinkAcceptDuplicatePayment(t *testing.T) {
case <-time.After(5 * time.Second):
t.Fatalf("payment result did not arrive")
}
// Now, if we attempt to send the payment *again* it should be rejected
// as it's a duplicate request.
err = n.aliceServer.htlcSwitch.SendHTLC(
n.firstBobChannelLink.ShortChanID(), pid, htlc,
)
if err != ErrAlreadyPaid {
t.Fatalf("ErrAlreadyPaid should have been received got: %v", err)
}
}
// TestChannelLinkAcceptOverpay tests that if we create an invoice for sender,

32
htlcswitch/switch.go
View File

@ -208,9 +208,6 @@ type Switch struct {
pendingPayments map[uint64]*pendingPayment
pendingMutex sync.RWMutex
// control provides verification of sending htlc mesages
control ControlTower
// circuits is storage for payment circuits which are used to
// forward the settle/fail htlc updates back to the add htlc initiator.
circuits CircuitMap
@ -290,7 +287,6 @@ func New(cfg Config, currentHeight uint32) (*Switch, error) {
bestHeight: currentHeight,
cfg: &cfg,
circuits: circuitMap,
control: NewPaymentControl(false, cfg.DB),
linkIndex: make(map[lnwire.ChannelID]ChannelLink),
mailOrchestrator: newMailOrchestrator(),
forwardingIndex: make(map[lnwire.ShortChannelID]ChannelLink),
@ -402,13 +398,6 @@ func (s *Switch) GetPaymentResult(paymentID uint64,
func (s *Switch) SendHTLC(firstHop lnwire.ShortChannelID, paymentID uint64,
htlc *lnwire.UpdateAddHTLC) error {
// Before sending, double check that we don't already have 1) an
// in-flight payment to this payment hash, or 2) a complete payment for
// the same hash.
if err := s.control.ClearForTakeoff(htlc); err != nil {
return err
}
// Create payment and add to the map of payment in order later to be
// able to retrieve it and return response to the user.
payment := &pendingPayment{
@ -439,10 +428,6 @@ func (s *Switch) SendHTLC(firstHop lnwire.ShortChannelID, paymentID uint64,
if err := s.forward(packet); err != nil {
s.removePendingPayment(paymentID)
if err := s.control.Fail(htlc.PaymentHash); err != nil {
return err
}
return err
}
@ -939,15 +924,6 @@ func (s *Switch) extractResult(deobfuscator ErrorDecrypter, n *networkResult,
// We've received a settle update which means we can finalize the user
// payment and return successful response.
case *lnwire.UpdateFulfillHTLC:
// Persistently mark that a payment to this payment hash
// succeeded. This will prevent us from ever making another
// payment to this hash.
err := s.control.Success(paymentHash)
if err != nil && err != ErrPaymentAlreadyCompleted {
return nil, fmt.Errorf("Unable to mark completed "+
"payment %x: %v", paymentHash, err)
}
return &PaymentResult{
Preimage: htlc.PaymentPreimage,
}, nil
@ -955,14 +931,6 @@ func (s *Switch) extractResult(deobfuscator ErrorDecrypter, n *networkResult,
// We've received a fail update which means we can finalize the
// user payment and return fail response.
case *lnwire.UpdateFailHTLC:
// Persistently mark that a payment to this payment hash
// failed. This will permit us to make another attempt at a
// successful payment.
err := s.control.Fail(paymentHash)
if err != nil && err != ErrPaymentAlreadyCompleted {
return nil, fmt.Errorf("Unable to ground payment "+
"%x: %v", paymentHash, err)
}
paymentErr := s.parseFailedPayment(
deobfuscator, paymentID, paymentHash, n.unencrypted,
n.isResolution, htlc,

61
routing/missioncontrol.go
View File

@ -14,7 +14,7 @@ import (
const (
// vertexDecay is the decay period of colored vertexes added to
// missionControl. Once vertexDecay passes after an entry has been
// MissionControl. Once vertexDecay passes after an entry has been
// added to the prune view, it is garbage collected. This value is
// larger than edgeDecay as an edge failure typical indicates an
// unbalanced channel, while a vertex failure indicates a node is not
@ -22,7 +22,7 @@ const (
vertexDecay = time.Duration(time.Minute * 5)
// edgeDecay is the decay period of colored edges added to
// missionControl. Once edgeDecay passed after an entry has been added,
// MissionControl. Once edgeDecay passed after an entry has been added,
// it is garbage collected. This value is smaller than vertexDecay as
// an edge related failure during payment sending typically indicates
// that a channel was unbalanced, a condition which may quickly change.
@ -31,11 +31,11 @@ const (
edgeDecay = time.Duration(time.Second * 5)
)
// missionControl contains state which summarizes the past attempts of HTLC
// MissionControl contains state which summarizes the past attempts of HTLC
// routing by external callers when sending payments throughout the network.
// missionControl remembers the outcome of these past routing attempts (success
// MissionControl remembers the outcome of these past routing attempts (success
// and failure), and is able to provide hints/guidance to future HTLC routing
// attempts. missionControl maintains a decaying network view of the
// attempts. MissionControl maintains a decaying network view of the
// edges/vertexes that should be marked as "pruned" during path finding. This
// graph view acts as a shared memory during HTLC payment routing attempts.
// With each execution, if an error is encountered, based on the type of error
@ -43,16 +43,16 @@ const (
// to the view. Later sending attempts will then query the view for all the
// vertexes/edges that should be ignored. Items in the view decay after a set
// period of time, allowing the view to be dynamic w.r.t network changes.
type missionControl struct {
type MissionControl struct {
// failedEdges maps a short channel ID to be pruned, to the time that
// it was added to the prune view. Edges are added to this map if a
// caller reports to missionControl a failure localized to that edge
// caller reports to MissionControl a failure localized to that edge
// when sending a payment.
failedEdges map[EdgeLocator]time.Time
// failedVertexes maps a node's public key that should be pruned, to
// the time that it was added to the prune view. Vertexes are added to
// this map if a caller reports to missionControl a failure localized
// this map if a caller reports to MissionControl a failure localized
// to that particular vertex.
failedVertexes map[route.Vertex]time.Time
@ -70,13 +70,17 @@ type missionControl struct {
// TODO(roasbeef): also add favorable metrics for nodes
}
// newMissionControl returns a new instance of missionControl.
// A compile time assertion to ensure MissionControl meets the
// PaymentSessionSource interface.
var _ PaymentSessionSource = (*MissionControl)(nil)
// NewMissionControl returns a new instance of MissionControl.
//
// TODO(roasbeef): persist memory
func newMissionControl(g *channeldb.ChannelGraph, selfNode *channeldb.LightningNode,
qb func(*channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi) *missionControl {
func NewMissionControl(g *channeldb.ChannelGraph, selfNode *channeldb.LightningNode,
qb func(*channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi) *MissionControl {
return &missionControl{
return &MissionControl{
failedEdges: make(map[EdgeLocator]time.Time),
failedVertexes: make(map[route.Vertex]time.Time),
selfNode: selfNode,
@ -96,12 +100,12 @@ type graphPruneView struct {
vertexes map[route.Vertex]struct{}
}
// GraphPruneView returns a new graphPruneView instance which is to be
// graphPruneView returns a new graphPruneView instance which is to be
// consulted during path finding. If a vertex/edge is found within the returned
// prune view, it is to be ignored as a goroutine has had issues routing
// through it successfully. Within this method the main view of the
// missionControl is garbage collected as entries are detected to be "stale".
func (m *missionControl) GraphPruneView() graphPruneView {
// MissionControl is garbage collected as entries are detected to be "stale".
func (m *MissionControl) graphPruneView() graphPruneView {
// First, we'll grab the current time, this value will be used to
// determine if an entry is stale or not.
now := time.Now()
@ -154,10 +158,10 @@ func (m *missionControl) GraphPruneView() graphPruneView {
// view from Mission Control. An optional set of routing hints can be provided
// in order to populate additional edges to explore when finding a path to the
// payment's destination.
func (m *missionControl) NewPaymentSession(routeHints [][]zpay32.HopHint,
target route.Vertex) (*paymentSession, error) {
func (m *MissionControl) NewPaymentSession(routeHints [][]zpay32.HopHint,
target route.Vertex) (PaymentSession, error) {
viewSnapshot := m.GraphPruneView()
viewSnapshot := m.graphPruneView()
edges := make(map[route.Vertex][]*channeldb.ChannelEdgePolicy)
@ -233,15 +237,28 @@ func (m *missionControl) NewPaymentSession(routeHints [][]zpay32.HopHint,
// NewPaymentSessionForRoute creates a new paymentSession instance that is just
// used for failure reporting to missioncontrol.
func (m *missionControl) NewPaymentSessionForRoute(preBuiltRoute *route.Route) *paymentSession {
func (m *MissionControl) NewPaymentSessionForRoute(preBuiltRoute *route.Route) PaymentSession {
return &paymentSession{
pruneViewSnapshot: m.GraphPruneView(),
pruneViewSnapshot: m.graphPruneView(),
errFailedPolicyChans: make(map[EdgeLocator]struct{}),
mc: m,
preBuiltRoute: preBuiltRoute,
}
}
// NewPaymentSessionEmpty creates a new paymentSession instance that is empty,
// and will be exhausted immediately. Used for failure reporting to
// missioncontrol for resumed payment we don't want to make more attempts for.
func (m *MissionControl) NewPaymentSessionEmpty() PaymentSession {
return &paymentSession{
pruneViewSnapshot: m.graphPruneView(),
errFailedPolicyChans: make(map[EdgeLocator]struct{}),
mc: m,
preBuiltRoute: &route.Route{},
preBuiltRouteTried: true,
}
}
// generateBandwidthHints is a helper function that's utilized the main
// findPath function in order to obtain hints from the lower layer w.r.t to the
// available bandwidth of edges on the network. Currently, we'll only obtain
@ -277,9 +294,9 @@ func generateBandwidthHints(sourceNode *channeldb.LightningNode,
return bandwidthHints, nil
}
// ResetHistory resets the history of missionControl returning it to a state as
// ResetHistory resets the history of MissionControl returning it to a state as
// if no payment attempts have been made.
func (m *missionControl) ResetHistory() {
func (m *MissionControl) ResetHistory() {
m.Lock()
m.failedEdges = make(map[EdgeLocator]time.Time)
m.failedVertexes = make(map[route.Vertex]time.Time)

223
routing/mock_test.go
View File

@ -1,8 +1,15 @@
package routing
import (
"fmt"
"sync"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/htlcswitch"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing/route"
"github.com/lightningnetwork/lnd/zpay32"
)
type mockPaymentAttemptDispatcher struct {
@ -62,3 +69,219 @@ func (m *mockPaymentAttemptDispatcher) setPaymentResult(
m.onPayment = f
}
type mockPaymentSessionSource struct {
routes []*route.Route
}
var _ PaymentSessionSource = (*mockPaymentSessionSource)(nil)
func (m *mockPaymentSessionSource) NewPaymentSession(routeHints [][]zpay32.HopHint,
target route.Vertex) (PaymentSession, error) {
return &mockPaymentSession{m.routes}, nil
}
func (m *mockPaymentSessionSource) NewPaymentSessionForRoute(
preBuiltRoute *route.Route) PaymentSession {
return nil
}
func (m *mockPaymentSessionSource) NewPaymentSessionEmpty() PaymentSession {
return &mockPaymentSession{}
}
type mockPaymentSession struct {
routes []*route.Route
}
var _ PaymentSession = (*mockPaymentSession)(nil)
func (m *mockPaymentSession) RequestRoute(payment *LightningPayment,
height uint32, finalCltvDelta uint16) (*route.Route, error) {
if len(m.routes) == 0 {
return nil, fmt.Errorf("no routes")
}
r := m.routes[0]
m.routes = m.routes[1:]
return r, nil
}
func (m *mockPaymentSession) ReportVertexFailure(v route.Vertex) {}
func (m *mockPaymentSession) ReportEdgeFailure(e *EdgeLocator) {}
func (m *mockPaymentSession) ReportEdgePolicyFailure(errSource route.Vertex, failedEdge *EdgeLocator) {
}
type mockPayer struct {
sendResult chan error
paymentResultErr chan error
paymentResult chan *htlcswitch.PaymentResult
quit chan struct{}
}
var _ PaymentAttemptDispatcher = (*mockPayer)(nil)
func (m *mockPayer) SendHTLC(_ lnwire.ShortChannelID,
paymentID uint64,
_ *lnwire.UpdateAddHTLC) error {
select {
case res := <-m.sendResult:
return res
case <-m.quit:
return fmt.Errorf("test quitting")
}
}
func (m *mockPayer) GetPaymentResult(paymentID uint64, _ htlcswitch.ErrorDecrypter) (
<-chan *htlcswitch.PaymentResult, error) {
select {
case res := <-m.paymentResult:
resChan := make(chan *htlcswitch.PaymentResult, 1)
resChan <- res
return resChan, nil
case err := <-m.paymentResultErr:
return nil, err
case <-m.quit:
return nil, fmt.Errorf("test quitting")
}
}
type initArgs struct {
c *channeldb.PaymentCreationInfo
}
type registerArgs struct {
a *channeldb.PaymentAttemptInfo
}
type successArgs struct {
preimg lntypes.Preimage
}
type failArgs struct {
reason channeldb.FailureReason
}
type mockControlTower struct {
inflights map[lntypes.Hash]channeldb.InFlightPayment
successful map[lntypes.Hash]struct{}
init chan initArgs
register chan registerArgs
success chan successArgs
fail chan failArgs
fetchInFlight chan struct{}
sync.Mutex
}
var _ channeldb.ControlTower = (*mockControlTower)(nil)
func makeMockControlTower() *mockControlTower {
return &mockControlTower{
inflights: make(map[lntypes.Hash]channeldb.InFlightPayment),
successful: make(map[lntypes.Hash]struct{}),
}
}
func (m *mockControlTower) InitPayment(phash lntypes.Hash,
c *channeldb.PaymentCreationInfo) error {
m.Lock()
defer m.Unlock()
if m.init != nil {
m.init <- initArgs{c}
}
if _, ok := m.successful[phash]; ok {
return fmt.Errorf("already successful")
}
_, ok := m.inflights[phash]
if ok {
return fmt.Errorf("in flight")
}
m.inflights[phash] = channeldb.InFlightPayment{
Info: c,
}
return nil
}
func (m *mockControlTower) RegisterAttempt(phash lntypes.Hash,
a *channeldb.PaymentAttemptInfo) error {
m.Lock()
defer m.Unlock()
if m.register != nil {
m.register <- registerArgs{a}
}
p, ok := m.inflights[phash]
if !ok {
return fmt.Errorf("not in flight")
}
p.Attempt = a
m.inflights[phash] = p
return nil
}
func (m *mockControlTower) Success(phash lntypes.Hash,
preimg lntypes.Preimage) error {
m.Lock()
defer m.Unlock()
if m.success != nil {
m.success <- successArgs{preimg}
}
delete(m.inflights, phash)
m.successful[phash] = struct{}{}
return nil
}
func (m *mockControlTower) Fail(phash lntypes.Hash,
reason channeldb.FailureReason) error {
m.Lock()
defer m.Unlock()
if m.fail != nil {
m.fail <- failArgs{reason}
}
delete(m.inflights, phash)
return nil
}
func (m *mockControlTower) FetchInFlightPayments() (
[]*channeldb.InFlightPayment, error) {
m.Lock()
defer m.Unlock()
if m.fetchInFlight != nil {
m.fetchInFlight <- struct{}{}
}
var fl []*channeldb.InFlightPayment
for _, ifl := range m.inflights {
fl = append(fl, &ifl)
}
return fl, nil
}

354
routing/payment_lifecycle.go Normal file
View File

@ -0,0 +1,354 @@
package routing
import (
"fmt"
"time"
"github.com/davecgh/go-spew/spew"
sphinx "github.com/lightningnetwork/lightning-onion"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/htlcswitch"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing/route"
)
// paymentLifecycle holds all information about the current state of a payment
// needed to resume if from any point.
type paymentLifecycle struct {
router *ChannelRouter
payment *LightningPayment
paySession PaymentSession
timeoutChan <-chan time.Time
currentHeight int32
finalCLTVDelta uint16
attempt *channeldb.PaymentAttemptInfo
circuit *sphinx.Circuit
lastError error
}
// resumePayment resumes the paymentLifecycle from the current state.
func (p *paymentLifecycle) resumePayment() ([32]byte, *route.Route, error) {
// We'll continue until either our payment succeeds, or we encounter a
// critical error during path finding.
for {
// If this payment had no existing payment attempt, we create
// and send one now.
if p.attempt == nil {
firstHop, htlcAdd, err := p.createNewPaymentAttempt()
if err != nil {
return [32]byte{}, nil, err
}
// Now that the attempt is created and checkpointed to
// the DB, we send it.
sendErr := p.sendPaymentAttempt(firstHop, htlcAdd)
if sendErr != nil {
// We must inspect the error to know whether it
// was critical or not, to decide whether we
// should continue trying.
err := p.handleSendError(sendErr)
if err != nil {
return [32]byte{}, nil, err
}
// Error was handled successfully, reset the
// attempt to indicate we want to make a new
// attempt.
p.attempt = nil
continue
}
} else {
// If this was a resumed attempt, we must regenerate the
// circuit.
_, c, err := generateSphinxPacket(
&p.attempt.Route, p.payment.PaymentHash[:],
p.attempt.SessionKey,
)
if err != nil {
return [32]byte{}, nil, err
}
p.circuit = c
}
// Using the created circuit, initialize the error decrypter so we can
// parse+decode any failures incurred by this payment within the
// switch.
errorDecryptor := &htlcswitch.SphinxErrorDecrypter{
OnionErrorDecrypter: sphinx.NewOnionErrorDecrypter(p.circuit),
}
// Now ask the switch to return the result of the payment when
// available.
resultChan, err := p.router.cfg.Payer.GetPaymentResult(
p.attempt.PaymentID, errorDecryptor,
)
switch {
// If this payment ID is unknown to the Switch, it means it was
// never checkpointed and forwarded by the switch before a
// restart. In this case we can safely send a new payment
// attempt, and wait for its result to be available.
case err == htlcswitch.ErrPaymentIDNotFound:
log.Debugf("Payment ID %v for hash %x not found in "+
"the Switch, retrying.", p.attempt.PaymentID,
p.payment.PaymentHash)
// Reset the attempt to indicate we want to make a new
// attempt.
p.attempt = nil
continue
// A critical, unexpected error was encountered.
case err != nil:
log.Errorf("Failed getting result for paymentID %d "+
"from switch: %v", p.attempt.PaymentID, err)
return [32]byte{}, nil, err
}
// The switch knows about this payment, we'll wait for a result
// to be available.
var (
result *htlcswitch.PaymentResult
ok bool
)
select {
case result, ok = <-resultChan:
if !ok {
return [32]byte{}, nil, htlcswitch.ErrSwitchExiting
}
case <-p.router.quit:
return [32]byte{}, nil, ErrRouterShuttingDown
}
// In case of a payment failure, we use the error to decide
// whether we should retry.
if result.Error != nil {
log.Errorf("Attempt to send payment %x failed: %v",
p.payment.PaymentHash, result.Error)
// We must inspect the error to know whether it was
// critical or not, to decide whether we should
// continue trying.
if err := p.handleSendError(result.Error); err != nil {
return [32]byte{}, nil, err
}
// Error was handled successfully, reset the attempt to
// indicate we want to make a new attempt.
p.attempt = nil
continue
}
// We successfully got a payment result back from the switch.
log.Debugf("Payment %x succeeded with pid=%v",
p.payment.PaymentHash, p.attempt.PaymentID)
// In case of success we atomically store the db payment and
// move the payment to the success state.
err = p.router.cfg.Control.Success(p.payment.PaymentHash, result.Preimage)
if err != nil {
log.Errorf("Unable to succeed payment "+
"attempt: %v", err)
return [32]byte{}, nil, err
}
// Terminal state, return the preimage and the route
// taken.
return result.Preimage, &p.attempt.Route, nil
}
}
// createNewPaymentAttempt creates and stores a new payment attempt to the
// database.
func (p *paymentLifecycle) createNewPaymentAttempt() (lnwire.ShortChannelID,
*lnwire.UpdateAddHTLC, error) {
// Before we attempt this next payment, we'll check to see if
// either we've gone past the payment attempt timeout, or the
// router is exiting. In either case, we'll stop this payment
// attempt short.
select {
case <-p.timeoutChan:
// Mark the payment as failed because of the
// timeout.
err := p.router.cfg.Control.Fail(
p.payment.PaymentHash, channeldb.FailureReasonTimeout,
)
if err != nil {
return lnwire.ShortChannelID{}, nil, err
}
errStr := fmt.Sprintf("payment attempt not completed " +
"before timeout")
return lnwire.ShortChannelID{}, nil,
newErr(ErrPaymentAttemptTimeout, errStr)
case <-p.router.quit:
// The payment will be resumed from the current state
// after restart.
return lnwire.ShortChannelID{}, nil, ErrRouterShuttingDown
default:
// Fall through if we haven't hit our time limit, or
// are expiring.
}
// Create a new payment attempt from the given payment session.
route, err := p.paySession.RequestRoute(
p.payment, uint32(p.currentHeight), p.finalCLTVDelta,
)
if err != nil {
// If we're unable to successfully make a payment using
// any of the routes we've found, then mark the payment
// as permanently failed.
saveErr := p.router.cfg.Control.Fail(
p.payment.PaymentHash, channeldb.FailureReasonNoRoute,
)
if saveErr != nil {
return lnwire.ShortChannelID{}, nil, saveErr
}
// If there was an error already recorded for this
// payment, we'll return that.
if p.lastError != nil {
return lnwire.ShortChannelID{}, nil,
fmt.Errorf("unable to route payment to "+
"destination: %v", p.lastError)
}
// Terminal state, return.
return lnwire.ShortChannelID{}, nil, err
}
// Generate a new key to be used for this attempt.
sessionKey, err := generateNewSessionKey()
if err != nil {
return lnwire.ShortChannelID{}, nil, err
}
// Generate the raw encoded sphinx packet to be included along
// with the htlcAdd message that we send directly to the
// switch.
onionBlob, c, err := generateSphinxPacket(
route, p.payment.PaymentHash[:], sessionKey,
)
if err != nil {
return lnwire.ShortChannelID{}, nil, err
}
// Update our cached circuit with the newly generated
// one.
p.circuit = c
// Craft an HTLC packet to send to the layer 2 switch. The
// metadata within this packet will be used to route the
// payment through the network, starting with the first-hop.
htlcAdd := &lnwire.UpdateAddHTLC{
Amount: route.TotalAmount,
Expiry: route.TotalTimeLock,
PaymentHash: p.payment.PaymentHash,
}
copy(htlcAdd.OnionBlob[:], onionBlob)
// Attempt to send this payment through the network to complete
// the payment. If this attempt fails, then we'll continue on
// to the next available route.
firstHop := lnwire.NewShortChanIDFromInt(
route.Hops[0].ChannelID,
)
// We generate a new, unique payment ID that we will use for
// this HTLC.
paymentID, err := p.router.cfg.NextPaymentID()
if err != nil {
return lnwire.ShortChannelID{}, nil, err
}
// We now have all the information needed to populate
// the current attempt information.
p.attempt = &channeldb.PaymentAttemptInfo{
PaymentID: paymentID,
SessionKey: sessionKey,
Route: *route,
}
// Before sending this HTLC to the switch, we checkpoint the
// fresh paymentID and route to the DB. This lets us know on
// startup the ID of the payment that we attempted to send,
// such that we can query the Switch for its whereabouts. The
// route is needed to handle the result when it eventually
// comes back.
err = p.router.cfg.Control.RegisterAttempt(p.payment.PaymentHash, p.attempt)
if err != nil {
return lnwire.ShortChannelID{}, nil, err
}
return firstHop, htlcAdd, nil
}
// sendPaymentAttempt attempts to send the current attempt to the switch.
func (p *paymentLifecycle) sendPaymentAttempt(firstHop lnwire.ShortChannelID,
htlcAdd *lnwire.UpdateAddHTLC) error {
log.Tracef("Attempting to send payment %x (pid=%v), "+
"using route: %v", p.payment.PaymentHash, p.attempt.PaymentID,
newLogClosure(func() string {
return spew.Sdump(p.attempt.Route)
}),
)
// Send it to the Switch. When this method returns we assume
// the Switch successfully has persisted the payment attempt,
// such that we can resume waiting for the result after a
// restart.
err := p.router.cfg.Payer.SendHTLC(
firstHop, p.attempt.PaymentID, htlcAdd,
)
if err != nil {
log.Errorf("Failed sending attempt %d for payment "+
"%x to switch: %v", p.attempt.PaymentID,
p.payment.PaymentHash, err)
return err
}
log.Debugf("Payment %x (pid=%v) successfully sent to switch",
p.payment.PaymentHash, p.attempt.PaymentID)
return nil
}
// handleSendError inspects the given error from the Switch and determines
// whether we should make another payment attempt.
func (p *paymentLifecycle) handleSendError(sendErr error) error {
finalOutcome := p.router.processSendError(
p.paySession, &p.attempt.Route, sendErr,
)
if finalOutcome {
log.Errorf("Payment %x failed with final outcome: %v",
p.payment.PaymentHash, sendErr)
// Mark the payment failed with no route.
// TODO(halseth): make payment codes for the actual reason we
// don't continue path finding.
err := p.router.cfg.Control.Fail(
p.payment.PaymentHash, channeldb.FailureReasonNoRoute,
)
if err != nil {
return err
}
// Terminal state, return the error we encountered.
return sendErr
}
// We get ready to make another payment attempt.
p.lastError = sendErr
return nil
}

51
routing/payment_session.go
View File

@ -9,9 +9,39 @@ import (
"github.com/lightningnetwork/lnd/routing/route"
)
// PaymentSession is used during SendPayment attempts to provide routes to
// attempt. It also defines methods to give the PaymentSession additional
// 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(payment *LightningPayment,
height uint32, finalCltvDelta uint16) (*route.Route, error)
// ReportVertexFailure reports to the PaymentSession that the passsed
// vertex failed to route the previous payment attempt. The
// PaymentSession will use this information to produce a better next
// route.
ReportVertexFailure(v route.Vertex)
// ReportEdgeFailure reports to the PaymentSession that the passed
// channel failed to route the previous payment attempt. The
// PaymentSession will use this information to produce a better next
// route.
ReportEdgeFailure(e *EdgeLocator)
// ReportEdgePolicyFailure reports to the PaymentSession that we
// received a failure message that relates to a channel policy. For
// these types of failures, the PaymentSession can decide whether to to
// keep the edge included in the next attempted route. The
// PaymentSession will use this information to produce a better next
// route.
ReportEdgePolicyFailure(errSource route.Vertex, failedEdge *EdgeLocator)
}
// paymentSession is used during an HTLC routings session to prune the local
// chain view in response to failures, and also report those failures back to
// missionControl. The snapshot copied for this session will only ever grow,
// MissionControl. The snapshot copied for this session will only ever grow,
// and will now be pruned after a decay like the main view within mission
// control. We do this as we want to avoid the case where we continually try a
// bad edge or route multiple times in a session. This can lead to an infinite
@ -30,7 +60,7 @@ type paymentSession struct {
// require pruning, but any subsequent ones do.
errFailedPolicyChans map[EdgeLocator]struct{}
mc *missionControl
mc *MissionControl
preBuiltRoute *route.Route
preBuiltRouteTried bool
@ -38,11 +68,17 @@ type paymentSession struct {
pathFinder pathFinder
}
// A compile time assertion to ensure paymentSession meets the PaymentSession
// interface.
var _ PaymentSession = (*paymentSession)(nil)
// ReportVertexFailure adds a vertex to the graph prune view after a client
// reports a routing failure localized to the vertex. The time the vertex was
// added is noted, as it'll be pruned from the shared view after a period of
// vertexDecay. However, the vertex will remain pruned for the *local* session.
// This ensures we don't retry this vertex during the payment attempt.
//
// NOTE: Part of the PaymentSession interface.
func (p *paymentSession) ReportVertexFailure(v route.Vertex) {
log.Debugf("Reporting vertex %v failure to Mission Control", v)
@ -57,13 +93,15 @@ func (p *paymentSession) ReportVertexFailure(v route.Vertex) {
p.mc.Unlock()
}
// ReportChannelFailure adds a channel to the graph prune view. The time the
// ReportEdgeFailure adds a channel to the graph prune view. The time the
// channel was added is noted, as it'll be pruned from the global view after a
// period of edgeDecay. However, the edge will remain pruned for the duration
// of the *local* session. This ensures that we don't flap by continually
// retrying an edge after its pruning has expired.
//
// TODO(roasbeef): also add value attempted to send and capacity of channel
//
// NOTE: Part of the PaymentSession interface.
func (p *paymentSession) ReportEdgeFailure(e *EdgeLocator) {
log.Debugf("Reporting edge %v failure to Mission Control", e)
@ -78,12 +116,14 @@ func (p *paymentSession) ReportEdgeFailure(e *EdgeLocator) {
p.mc.Unlock()
}
// ReportChannelPolicyFailure handles a failure message that relates to a
// ReportEdgePolicyFailure handles a failure message that relates to a
// channel policy. For these types of failures, the policy is updated and we
// want to keep it included during path finding. This function does mark the
// edge as 'policy failed once'. The next time it fails, the whole node will be
// pruned. This is to prevent nodes from keeping us busy by continuously sending
// new channel updates.
//
// NOTE: Part of the PaymentSession interface.
func (p *paymentSession) ReportEdgePolicyFailure(
errSource route.Vertex, failedEdge *EdgeLocator) {
@ -111,6 +151,7 @@ func (p *paymentSession) ReportEdgePolicyFailure(
// will be explored, which feeds into the recommendations made for routing.
//
// NOTE: This function is safe for concurrent access.
// NOTE: Part of the PaymentSession interface.
func (p *paymentSession) RequestRoute(payment *LightningPayment,
height uint32, finalCltvDelta uint16) (*route.Route, error) {
@ -151,7 +192,7 @@ func (p *paymentSession) RequestRoute(payment *LightningPayment,
// Taking into account this prune view, we'll attempt to locate a path
// to our destination, respecting the recommendations from
// missionControl.
// MissionControl.
path, err := p.pathFinder(
&graphParams{
graph: p.mc.graph,

2
routing/payment_session_test.go
View File

@ -33,7 +33,7 @@ func TestRequestRoute(t *testing.T) {
}
session := &paymentSession{
mc: &missionControl{
mc: &MissionControl{
selfNode: &channeldb.LightningNode{},
},
pruneViewSnapshot: graphPruneView{},

314
routing/router.go
View File

@ -147,6 +147,28 @@ type PaymentAttemptDispatcher interface {
<-chan *htlcswitch.PaymentResult, error)
}
// PaymentSessionSource is an interface that defines a source for the router to
// retrive new payment sessions.
type PaymentSessionSource interface {
// NewPaymentSession creates a new payment session that will produce
// routes to the given target. An optional set of routing hints can be
// provided in order to populate additional edges to explore when
// finding a path to the payment's destination.
NewPaymentSession(routeHints [][]zpay32.HopHint,
target route.Vertex) (PaymentSession, error)
// NewPaymentSessionForRoute creates a new paymentSession instance that
// is just used for failure reporting to missioncontrol, and will only
// attempt the given route.
NewPaymentSessionForRoute(preBuiltRoute *route.Route) PaymentSession
// NewPaymentSessionEmpty creates a new paymentSession instance that is
// empty, and will be exhausted immediately. Used for failure reporting
// to missioncontrol for resumed payment we don't want to make more
// attempts for.
NewPaymentSessionEmpty() PaymentSession
}
// FeeSchema is the set fee configuration for a Lightning Node on the network.
// Using the coefficients described within the schema, the required fee to
// forward outgoing payments can be derived.
@ -199,6 +221,19 @@ type Config struct {
// their results.
Payer PaymentAttemptDispatcher
// Control keeps track of the status of ongoing payments, ensuring we
// can properly resume them across restarts.
Control channeldb.ControlTower
// MissionControl is a shared memory of sorts that executions of
// payment path finding use in order to remember which vertexes/edges
// were pruned from prior attempts. During SendPayment execution,
// errors sent by nodes are mapped into a vertex or edge to be pruned.
// Each run will then take into account this set of pruned
// vertexes/edges to reduce route failure and pass on graph information
// gained to the next execution.
MissionControl PaymentSessionSource
// ChannelPruneExpiry is the duration used to determine if a channel
// should be pruned or not. If the delta between now and when the
// channel was last updated is greater than ChannelPruneExpiry, then
@ -338,15 +373,6 @@ type ChannelRouter struct {
// existing client.
ntfnClientUpdates chan *topologyClientUpdate
// missionControl is a shared memory of sorts that executions of
// payment path finding use in order to remember which vertexes/edges
// were pruned from prior attempts. During SendPayment execution,
// errors sent by nodes are mapped into a vertex or edge to be pruned.
// Each run will then take into account this set of pruned
// vertexes/edges to reduce route failure and pass on graph information
// gained to the next execution.
missionControl *missionControl
// channelEdgeMtx is a mutex we use to make sure we process only one
// ChannelEdgePolicy at a time for a given channelID, to ensure
// consistency between the various database accesses.
@ -388,10 +414,6 @@ func New(cfg Config) (*ChannelRouter, error) {
quit: make(chan struct{}),
}
r.missionControl = newMissionControl(
cfg.Graph, selfNode, cfg.QueryBandwidth,
)
return r, nil
}
@ -488,6 +510,40 @@ func (r *ChannelRouter) Start() error {
}
}
// If any payments are still in flight, we resume, to make sure their
// results are properly handled.
payments, err := r.cfg.Control.FetchInFlightPayments()
if err != nil {
return err
}
for _, payment := range payments {
log.Infof("Resuming payment with hash %v", payment.Info.PaymentHash)
r.wg.Add(1)
go func(payment *channeldb.InFlightPayment) {
defer r.wg.Done()
// We create a dummy, empty payment session such that
// we won't make another payment attempt when the
// result for the in-flight attempt is received.
paySession := r.cfg.MissionControl.NewPaymentSessionEmpty()
lPayment := &LightningPayment{
PaymentHash: payment.Info.PaymentHash,
}
_, _, err = r.sendPayment(payment.Attempt, lPayment, paySession)
if err != nil {
log.Errorf("Resuming payment with hash %v "+
"failed: %v.", payment.Info.PaymentHash, err)
return
}
log.Infof("Resumed payment with hash %v completed.",
payment.Info.PaymentHash)
}(payment)
}
r.wg.Add(1)
go r.networkHandler()
@ -1513,6 +1569,7 @@ type LightningPayment struct {
// when we should should abandon the payment attempt after consecutive
// payment failure. This prevents us from attempting to send a payment
// indefinitely.
// TODO(halseth): make wallclock time to allow resume after startup.
PayAttemptTimeout time.Duration
// RouteHints represents the different routing hints that can be used to
@ -1543,14 +1600,30 @@ func (r *ChannelRouter) SendPayment(payment *LightningPayment) ([32]byte, *route
// Before starting the HTLC routing attempt, we'll create a fresh
// payment session which will report our errors back to mission
// control.
paySession, err := r.missionControl.NewPaymentSession(
paySession, err := r.cfg.MissionControl.NewPaymentSession(
payment.RouteHints, payment.Target,
)
if err != nil {
return [32]byte{}, nil, err
}
return r.sendPayment(payment, paySession)
// Record this payment hash with the ControlTower, ensuring it is not
// already in-flight.
info := &channeldb.PaymentCreationInfo{
PaymentHash: payment.PaymentHash,
Value: payment.Amount,
CreationDate: time.Now(),
PaymentRequest: nil,
}
err = r.cfg.Control.InitPayment(payment.PaymentHash, info)
if err != nil {
return [32]byte{}, nil, err
}
// Since this is the first time this payment is being made, we pass nil
// for the existing attempt.
return r.sendPayment(nil, payment, paySession)
}
// SendToRoute attempts to send a payment with the given hash through the
@ -1560,7 +1633,7 @@ func (r *ChannelRouter) SendToRoute(hash lntypes.Hash, route *route.Route) (
lntypes.Preimage, error) {
// Create a payment session for just this route.
paySession := r.missionControl.NewPaymentSessionForRoute(route)
paySession := r.cfg.MissionControl.NewPaymentSessionForRoute(route)
// Create a (mostly) dummy payment, as the created payment session is
// not going to do path finding.
@ -1568,8 +1641,23 @@ func (r *ChannelRouter) SendToRoute(hash lntypes.Hash, route *route.Route) (
PaymentHash: hash,
}
preimage, _, err := r.sendPayment(payment, paySession)
// Record this payment hash with the ControlTower, ensuring it is not
// already in-flight.
info := &channeldb.PaymentCreationInfo{
PaymentHash: payment.PaymentHash,
Value: payment.Amount,
CreationDate: time.Now(),
PaymentRequest: nil,
}
err := r.cfg.Control.InitPayment(payment.PaymentHash, info)
if err != nil {
return [32]byte{}, err
}
// Since this is the first time this payment is being made, we pass nil
// for the existing attempt.
preimage, _, err := r.sendPayment(nil, payment, paySession)
return preimage, err
}
@ -1580,8 +1668,19 @@ func (r *ChannelRouter) SendToRoute(hash lntypes.Hash, route *route.Route) (
// will be returned which describes the path the successful payment traversed
// within the network to reach the destination. Additionally, the payment
// preimage will also be returned.
func (r *ChannelRouter) sendPayment(payment *LightningPayment,
paySession *paymentSession) ([32]byte, *route.Route, error) {
//
// The existing attempt argument should be set to nil if this is a payment that
// haven't had any payment attempt sent to the switch yet. If it has had an
// attempt already, it should be passed such that the result can be retrieved.
//
// This method relies on the ControlTower's internal payment state machine to
// carry out its execution. After restarts it is safe, and assumed, that the
// router will call this method for every payment still in-flight according to
// the ControlTower.
func (r *ChannelRouter) sendPayment(
existingAttempt *channeldb.PaymentAttemptInfo,
payment *LightningPayment, paySession PaymentSession) (
[32]byte, *route.Route, error) {
log.Tracef("Dispatching route for lightning payment: %v",
newLogClosure(func() string {
@ -1617,171 +1716,22 @@ func (r *ChannelRouter) sendPayment(payment *LightningPayment,
timeoutChan := time.After(payAttemptTimeout)
// We'll continue until either our payment succeeds, or we encounter a
// critical error during path finding.
var lastError error
for {
// Before we attempt this next payment, we'll check to see if
// either we've gone past the payment attempt timeout, or the
// router is exiting. In either case, we'll stop this payment
// attempt short.
select {
case <-timeoutChan:
errStr := fmt.Sprintf("payment attempt not completed "+
"before timeout of %v", payAttemptTimeout)
return [32]byte{}, nil, newErr(
ErrPaymentAttemptTimeout, errStr,
)
case <-r.quit:
return [32]byte{}, nil, ErrRouterShuttingDown
default:
// Fall through if we haven't hit our time limit, or
// are expiring.
}
route, err := paySession.RequestRoute(
payment, uint32(currentHeight), finalCLTVDelta,
)
if err != nil {
// If we're unable to successfully make a payment using
// any of the routes we've found, then return an error.
if lastError != nil {
return [32]byte{}, nil, fmt.Errorf("unable to "+
"route payment to destination: %v",
lastError)
}
return [32]byte{}, nil, err
}
// Send payment attempt. It will return a final boolean
// indicating if more attempts are needed.
preimage, final, err := r.sendPaymentAttempt(
paySession, route, payment.PaymentHash,
)
if final {
return preimage, route, err
}
lastError = err
}
}
// sendPaymentAttempt tries to send the payment via the specified route. If
// successful, it returns the obtained preimage. If an error occurs, the last
// bool parameter indicates whether this is a final outcome or more attempts
// should be made.
func (r *ChannelRouter) sendPaymentAttempt(paySession *paymentSession,
route *route.Route, paymentHash [32]byte) ([32]byte, bool, error) {
log.Tracef("Attempting to send payment %x, using route: %v",
paymentHash, newLogClosure(func() string {
return spew.Sdump(route)
}),
)
// Generate a new key to be used for this attempt.
sessionKey, err := generateNewSessionKey()
if err != nil {
return [32]byte{}, true, err
}
// Generate the raw encoded sphinx packet to be included along
// with the htlcAdd message that we send directly to the
// switch.
onionBlob, circuit, err := generateSphinxPacket(
route, paymentHash[:], sessionKey,
)
if err != nil {
return [32]byte{}, true, err
// Now set up a paymentLifecycle struct with these params, such that we
// can resume the payment from the current state.
p := &paymentLifecycle{
router: r,
payment: payment,
paySession: paySession,
timeoutChan: timeoutChan,
currentHeight: currentHeight,
finalCLTVDelta: finalCLTVDelta,
attempt: existingAttempt,
circuit: nil,
lastError: nil,
}
// Craft an HTLC packet to send to the layer 2 switch. The
// metadata within this packet will be used to route the
// payment through the network, starting with the first-hop.
htlcAdd := &lnwire.UpdateAddHTLC{
Amount: route.TotalAmount,
Expiry: route.TotalTimeLock,
PaymentHash: paymentHash,
}
copy(htlcAdd.OnionBlob[:], onionBlob)
return p.resumePayment()
// Attempt to send this payment through the network to complete
// the payment. If this attempt fails, then we'll continue on
// to the next available route.
firstHop := lnwire.NewShortChanIDFromInt(
route.Hops[0].ChannelID,
)
// We generate a new, unique payment ID that we will use for
// this HTLC.
paymentID, err := r.cfg.NextPaymentID()
if err != nil {
return [32]byte{}, true, err
}
err = r.cfg.Payer.SendHTLC(
firstHop, paymentID, htlcAdd,
)
if err != nil {
log.Errorf("Failed sending attempt %d for payment %x to "+
"switch: %v", paymentID, paymentHash, err)
// We must inspect the error to know whether it was critical or
// not, to decide whether we should continue trying.
finalOutcome := r.processSendError(
paySession, route, err,
)
return [32]byte{}, finalOutcome, err
}
// Using the created circuit, initialize the error decrypter so we can
// parse+decode any failures incurred by this payment within the
// switch.
errorDecryptor := &htlcswitch.SphinxErrorDecrypter{
OnionErrorDecrypter: sphinx.NewOnionErrorDecrypter(circuit),
}
// Now ask the switch to return the result of the payment when
// available.
resultChan, err := r.cfg.Payer.GetPaymentResult(
paymentID, errorDecryptor,
)
if err != nil {
log.Errorf("Failed getting result for paymentID %d "+
"from switch: %v", paymentID, err)
return [32]byte{}, true, err
}
var (
result *htlcswitch.PaymentResult
ok bool
)
select {
case result, ok = <-resultChan:
if !ok {
return [32]byte{}, true, htlcswitch.ErrSwitchExiting
}
case <-r.quit:
return [32]byte{}, true, ErrRouterShuttingDown
}
if result.Error != nil {
log.Errorf("Attempt to send payment %x failed: %v",
paymentHash, result.Error)
finalOutcome := r.processSendError(
paySession, route, result.Error,
)
return [32]byte{}, finalOutcome, result.Error
}
return result.Preimage, true, nil
}
// processSendError analyzes the error for the payment attempt received from the
@ -1789,7 +1739,7 @@ func (r *ChannelRouter) sendPaymentAttempt(paySession *paymentSession,
// error type, this error is either the final outcome of the payment or we need
// to continue with an alternative route. This is indicated by the boolean
// return value.
func (r *ChannelRouter) processSendError(paySession *paymentSession,
func (r *ChannelRouter) processSendError(paySession PaymentSession,
rt *route.Route, err error) bool {
fErr, ok := err.(*htlcswitch.ForwardingError)

654
routing/router_test.go
View File

@ -50,6 +50,7 @@ func (c *testCtx) RestartRouter() error {
Chain: c.chain,
ChainView: c.chainView,
Payer: &mockPaymentAttemptDispatcher{},
Control: makeMockControlTower(),
ChannelPruneExpiry: time.Hour * 24,
GraphPruneInterval: time.Hour * 2,
})
@ -83,11 +84,25 @@ func createTestCtxFromGraphInstance(startingHeight uint32, graphInstance *testGr
// be populated.
chain := newMockChain(startingHeight)
chainView := newMockChainView(chain)
selfNode, err := graphInstance.graph.SourceNode()
if err != nil {
return nil, nil, err
}
mc := NewMissionControl(
graphInstance.graph, selfNode,
func(e *channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi {
return lnwire.NewMSatFromSatoshis(e.Capacity)
},
)
router, err := New(Config{
Graph: graphInstance.graph,
Chain: chain,
ChainView: chainView,
Payer: &mockPaymentAttemptDispatcher{},
Control: makeMockControlTower(),
MissionControl: mc,
ChannelPruneExpiry: time.Hour * 24,
GraphPruneInterval: time.Hour * 2,
QueryBandwidth: func(e *channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi {
@ -716,7 +731,9 @@ func TestSendPaymentErrorNonFinalTimeLockErrors(t *testing.T) {
})
// Once again, Roasbeef should route around Goku since they disagree
// w.r.t to the block height, and instead go through Pham Nuwen.
// w.r.t to the block height, and instead go through Pham Nuwen. We
// flip a bit in the payment hash to allow resending this payment.
payment.PaymentHash[1] ^= 1
paymentPreImage, rt, err = ctx.router.SendPayment(&payment)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
@ -805,7 +822,7 @@ func TestSendPaymentErrorPathPruning(t *testing.T) {
return preImage, nil
})
ctx.router.missionControl.ResetHistory()
ctx.router.cfg.MissionControl.(*MissionControl).ResetHistory()
// When we try to dispatch that payment, we should receive an error as
// both attempts should fail and cause both routes to be pruned.
@ -820,7 +837,7 @@ func TestSendPaymentErrorPathPruning(t *testing.T) {
t.Fatalf("expected UnknownNextPeer instead got: %v", err)
}
ctx.router.missionControl.ResetHistory()
ctx.router.cfg.MissionControl.(*MissionControl).ResetHistory()
// Next, we'll modify the SendToSwitch method to indicate that luo ji
// wasn't originally online. This should also halt the send all
@ -863,7 +880,7 @@ func TestSendPaymentErrorPathPruning(t *testing.T) {
ctx.aliases))
}
ctx.router.missionControl.ResetHistory()
ctx.router.cfg.MissionControl.(*MissionControl).ResetHistory()
// Finally, we'll modify the SendToSwitch function to indicate that the
// roasbeef -> luoji channel has insufficient capacity. This should
@ -883,6 +900,8 @@ func TestSendPaymentErrorPathPruning(t *testing.T) {
return preImage, nil
})
// We flip a bit in the payment hash to allow resending this payment.
payment.PaymentHash[1] ^= 1
paymentPreImage, rt, err = ctx.router.SendPayment(&payment)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
@ -1528,6 +1547,7 @@ func TestWakeUpOnStaleBranch(t *testing.T) {
Chain: ctx.chain,
ChainView: ctx.chainView,
Payer: &mockPaymentAttemptDispatcher{},
Control: makeMockControlTower(),
ChannelPruneExpiry: time.Hour * 24,
GraphPruneInterval: time.Hour * 2,
})
@ -2490,3 +2510,629 @@ func assertChannelsPruned(t *testing.T, graph *channeldb.ChannelGraph,
}
}
}
// TestRouterPaymentStateMachine tests that the router interacts as expected
// with the ControlTower during a payment lifecycle, such that it payment
// attempts are not sent twice to the switch, and results are handled after a
// restart.
func TestRouterPaymentStateMachine(t *testing.T) {
t.Parallel()
const startingBlockHeight = 101
// Setup two simple channels such that we can mock sending along this
// route.
chanCapSat := btcutil.Amount(100000)
testChannels := []*testChannel{
symmetricTestChannel("a", "b", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 1),
symmetricTestChannel("b", "c", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 2),
}
testGraph, err := createTestGraphFromChannels(testChannels)
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
defer testGraph.cleanUp()
hop1 := testGraph.aliasMap["b"]
hop2 := testGraph.aliasMap["c"]
hops := []*route.Hop{
{
ChannelID: 1,
PubKeyBytes: hop1,
},
{
ChannelID: 2,
PubKeyBytes: hop2,
},
}
// We create a simple route that we will supply every time the router
// requests one.
rt, err := route.NewRouteFromHops(
lnwire.MilliSatoshi(10000), 100, testGraph.aliasMap["a"], hops,
)
if err != nil {
t.Fatalf("unable to create route: %v", err)
}
// A payment state machine test case consists of several ordered steps,
// that we use for driving the scenario.
type testCase struct {
// steps is a list of steps to perform during the testcase.
steps []string
// routes is the sequence of routes we will provide to the
// router when it requests a new route.
routes []*route.Route
}
const (
// routerInitPayment is a test step where we expect the router
// to call the InitPayment method on the control tower.
routerInitPayment = "Router:init-payment"
// routerRegisterAttempt is a test step where we expect the
// router to call the RegisterAttempt method on the control
// tower.
routerRegisterAttempt = "Router:register-attempt"
// routerSuccess is a test step where we expect the router to
// call the Success method on the control tower.
routerSuccess = "Router:success"
// routerFail is a test step where we expect the router to call
// the Fail method on the control tower.
routerFail = "Router:fail"
// sendToSwitchSuccess is a step where we expect the router to
// call send the payment attempt to the switch, and we will
// respond with a non-error, indicating that the payment
// attempt was successfully forwarded.
sendToSwitchSuccess = "SendToSwitch:success"
// sendToSwitchResultFailure is a step where we expect the
// router to send the payment attempt to the switch, and we
// will respond with a forwarding error. This can happen when
// forwarding fail on our local links.
sendToSwitchResultFailure = "SendToSwitch:failure"
// getPaymentResultSuccess is a test step where we expect the
// router to call the GetPaymentResult method, and we will
// respond with a successful payment result.
getPaymentResultSuccess = "GetPaymentResult:success"
// getPaymentResultFailure is a test step where we expect the
// router to call the GetPaymentResult method, and we will
// respond with a forwarding error.
getPaymentResultFailure = "GetPaymentResult:failure"
// resendPayment is a test step where we manually try to resend
// the same payment, making sure the router responds with an
// error indicating that it is alreayd in flight.
resendPayment = "ResendPayment"
// startRouter is a step where we manually start the router,
// used to test that it automatically will resume payments at
// startup.
startRouter = "StartRouter"
// stopRouter is a test step where we manually make the router
// shut down.
stopRouter = "StopRouter"
// paymentSuccess is a step where assert that we receive a
// successful result for the original payment made.
paymentSuccess = "PaymentSuccess"
// paymentError is a step where assert that we receive an error
// for the original payment made.
paymentError = "PaymentError"
// resentPaymentSuccess is a step where assert that we receive
// a successful result for a payment that was resent.
resentPaymentSuccess = "ResentPaymentSuccess"
// resentPaymentError is a step where assert that we receive an
// error for a payment that was resent.
resentPaymentError = "ResentPaymentError"
)
tests := []testCase{
{
// Tests a normal payment flow that succeeds.
steps: []string{
routerInitPayment,
routerRegisterAttempt,
sendToSwitchSuccess,
getPaymentResultSuccess,
routerSuccess,
paymentSuccess,
},
routes: []*route.Route{rt},
},
{
// A payment flow with a failure on the first attempt,
// but that succeeds on the second attempt.
steps: []string{
routerInitPayment,
routerRegisterAttempt,
sendToSwitchSuccess,
// Make the first sent attempt fail.
getPaymentResultFailure,
// The router should retry.
routerRegisterAttempt,
sendToSwitchSuccess,
// Make the second sent attempt succeed.
getPaymentResultSuccess,
routerSuccess,
paymentSuccess,
},
routes: []*route.Route{rt, rt},
},
{
// A payment flow with a forwarding failure first time
// sending to the switch, but that succeeds on the
// second attempt.
steps: []string{
routerInitPayment,
routerRegisterAttempt,
// Make the first sent attempt fail.
sendToSwitchResultFailure,
// The router should retry.
routerRegisterAttempt,
sendToSwitchSuccess,
// Make the second sent attempt succeed.
getPaymentResultSuccess,
routerSuccess,
paymentSuccess,
},
routes: []*route.Route{rt, rt},
},
{
// A payment that fails on the first attempt, and has
// only one route available to try. It will therefore
// fail permanently.
steps: []string{
routerInitPayment,
routerRegisterAttempt,
sendToSwitchSuccess,
// Make the first sent attempt fail.
getPaymentResultFailure,
// Since there are no more routes to try, the
// payment should fail.
routerFail,
paymentError,
},
routes: []*route.Route{rt},
},
{
// We expect the payment to fail immediately if we have
// no routes to try.
steps: []string{
routerInitPayment,
routerFail,
paymentError,
},
routes: []*route.Route{},
},
{
// A normal payment flow, where we attempt to resend
// the same payment after each step. This ensures that
// the router don't attempt to resend a payment already
// in flight.
steps: []string{
routerInitPayment,
routerRegisterAttempt,
// Manually resend the payment, the router
// should attempt to init with the control
// tower, but fail since it is already in
// flight.
resendPayment,
routerInitPayment,
resentPaymentError,
// The original payment should proceed as
// normal.
sendToSwitchSuccess,
// Again resend the payment and assert it's not
// allowed.
resendPayment,
routerInitPayment,
resentPaymentError,
// Notify about a success for the original
// payment.
getPaymentResultSuccess,
routerSuccess,
// Now that the original payment finished,
// resend it again to ensure this is not
// allowed.
resendPayment,
routerInitPayment,
resentPaymentError,
paymentSuccess,
},
routes: []*route.Route{rt},
},
{
// Tests that the router is able to handle the
// receieved payment result after a restart.
steps: []string{
routerInitPayment,
routerRegisterAttempt,
sendToSwitchSuccess,
// Shut down the router. The original caller
// should get notified about this.
stopRouter,
paymentError,
// Start the router again, and ensure the
// router registers the success with the
// control tower.
startRouter,
getPaymentResultSuccess,
routerSuccess,
},
routes: []*route.Route{rt},
},
{
// Tests that we are allowed to resend a payment after
// it has permanently failed.
steps: []string{
routerInitPayment,
routerRegisterAttempt,
sendToSwitchSuccess,
// Resending the payment at this stage should
// not be allowed.
resendPayment,
routerInitPayment,
resentPaymentError,
// Make the first attempt fail.
getPaymentResultFailure,
routerFail,
// Since we have no more routes to try, the
// original payment should fail.
paymentError,
// Now resend the payment again. This should be
// allowed, since the payment has failed.
resendPayment,
routerInitPayment,
routerRegisterAttempt,
sendToSwitchSuccess,
getPaymentResultSuccess,
routerSuccess,
resentPaymentSuccess,
},
routes: []*route.Route{rt},
},
}
// Create a mock control tower with channels set up, that we use to
// synchronize and listen for events.
control := makeMockControlTower()
control.init = make(chan initArgs)
control.register = make(chan registerArgs)
control.success = make(chan successArgs)
control.fail = make(chan failArgs)
control.fetchInFlight = make(chan struct{})
quit := make(chan struct{})
defer close(quit)
// setupRouter is a helper method that creates and starts the router in
// the desired configuration for this test.
setupRouter := func() (*ChannelRouter, chan error,
chan *htlcswitch.PaymentResult, chan error) {
chain := newMockChain(startingBlockHeight)
chainView := newMockChainView(chain)
// We set uo the use the following channels and a mock Payer to
// synchonize with the interaction to the Switch.
sendResult := make(chan error)
paymentResultErr := make(chan error)
paymentResult := make(chan *htlcswitch.PaymentResult)
payer := &mockPayer{
sendResult: sendResult,
paymentResult: paymentResult,
paymentResultErr: paymentResultErr,
}
router, err := New(Config{
Graph: testGraph.graph,
Chain: chain,
ChainView: chainView,
Control: control,
MissionControl: &mockPaymentSessionSource{},
Payer: payer,
ChannelPruneExpiry: time.Hour * 24,
GraphPruneInterval: time.Hour * 2,
QueryBandwidth: func(e *channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi {
return lnwire.NewMSatFromSatoshis(e.Capacity)
},
NextPaymentID: func() (uint64, error) {
next := atomic.AddUint64(&uniquePaymentID, 1)
return next, nil
},
})
if err != nil {
t.Fatalf("unable to create router %v", err)
}
// On startup, the router should fetch all pending payments
// from the ControlTower, so assert that here.
didFetch := make(chan struct{})
go func() {
select {
case <-control.fetchInFlight:
close(didFetch)
case <-time.After(1 * time.Second):
t.Fatalf("router did not fetch in flight " +
"payments")
}
}()
if err := router.Start(); err != nil {
t.Fatalf("unable to start router: %v", err)
}
select {
case <-didFetch:
case <-time.After(1 * time.Second):
t.Fatalf("did not fetch in flight payments at startup")
}
return router, sendResult, paymentResult, paymentResultErr
}
router, sendResult, getPaymentResult, getPaymentResultErr := setupRouter()
defer router.Stop()
for _, test := range tests {
// Craft a LightningPayment struct.
var preImage lntypes.Preimage
if _, err := rand.Read(preImage[:]); err != nil {
t.Fatalf("unable to generate preimage")
}
payHash := preImage.Hash()
paymentAmt := lnwire.NewMSatFromSatoshis(1000)
payment := LightningPayment{
Target: testGraph.aliasMap["c"],
Amount: paymentAmt,
FeeLimit: noFeeLimit,
PaymentHash: payHash,
}
errSource, err := btcec.ParsePubKey(hop1[:], btcec.S256())
if err != nil {
t.Fatalf("unable to fetch source node pub: %v", err)
}
copy(preImage[:], bytes.Repeat([]byte{9}, 32))
router.cfg.MissionControl = &mockPaymentSessionSource{
routes: test.routes,
}
// Send the payment. Since this is new payment hash, the
// information should be registered with the ControlTower.
paymentResult := make(chan error)
go func() {
_, _, err := router.SendPayment(&payment)
paymentResult <- err
}()
var resendResult chan error
for _, step := range test.steps {
switch step {
case routerInitPayment:
var args initArgs
select {
case args = <-control.init:
case <-time.After(1 * time.Second):
t.Fatalf("no init payment with control")
}
if args.c == nil {
t.Fatalf("expected non-nil CreationInfo")
}
// In this step we expect the router to make a call to
// register a new attempt with the ControlTower.
case routerRegisterAttempt:
var args registerArgs
select {
case args = <-control.register:
case <-time.After(1 * time.Second):
t.Fatalf("not registered with control")
}
if args.a == nil {
t.Fatalf("expected non-nil AttemptInfo")
}
// In this step we expect the router to call the
// ControlTower's Succcess method with the preimage.
case routerSuccess:
select {
case _ = <-control.success:
case <-time.After(1 * time.Second):
t.Fatalf("not registered with control")
}
// In this step we expect the router to call the
// ControlTower's Fail method, to indicate that the
// payment failed.
case routerFail:
select {
case _ = <-control.fail:
case <-time.After(1 * time.Second):
t.Fatalf("not registered with control")
}
// In this step we expect the SendToSwitch method to be
// called, and we respond with a nil-error.
case sendToSwitchSuccess:
select {
case sendResult <- nil:
case <-time.After(1 * time.Second):
t.Fatalf("unable to send result")
}
// In this step we expect the SendToSwitch method to be
// called, and we respond with a forwarding error
case sendToSwitchResultFailure:
select {
case sendResult <- &htlcswitch.ForwardingError{
ErrorSource: errSource,
FailureMessage: &lnwire.FailTemporaryChannelFailure{},
}:
case <-time.After(1 * time.Second):
t.Fatalf("unable to send result")
}
// In this step we expect the GetPaymentResult method
// to be called, and we respond with the preimage to
// complete the payment.
case getPaymentResultSuccess:
select {
case getPaymentResult <- &htlcswitch.PaymentResult{
Preimage: preImage,
}:
case <-time.After(1 * time.Second):
t.Fatalf("unable to send result")
}
// In this state we expect the GetPaymentResult method
// to be called, and we respond with a forwarding
// error, indicating that the router should retry.
case getPaymentResultFailure:
select {
case getPaymentResult <- &htlcswitch.PaymentResult{
Error: &htlcswitch.ForwardingError{
ErrorSource: errSource,
FailureMessage: &lnwire.FailTemporaryChannelFailure{},
},
}:
case <-time.After(1 * time.Second):
t.Fatalf("unable to get result")
}
// In this step we manually try to resend the same
// payment, making sure the router responds with an
// error indicating that it is alreayd in flight.
case resendPayment:
resendResult = make(chan error)
go func() {
_, _, err := router.SendPayment(&payment)
resendResult <- err
}()
// In this step we manually stop the router.
case stopRouter:
select {
case getPaymentResultErr <- fmt.Errorf(
"shutting down"):
case <-time.After(1 * time.Second):
t.Fatalf("unable to send payment " +
"result error")
}
if err := router.Stop(); err != nil {
t.Fatalf("unable to restart: %v", err)
}
// In this step we manually start the router.
case startRouter:
router, sendResult, getPaymentResult,
getPaymentResultErr = setupRouter()
// In this state we expect to receive an error for the
// original payment made.
case paymentError:
select {
case err := <-paymentResult:
if err == nil {
t.Fatalf("expected error")
}
case <-time.After(1 * time.Second):
t.Fatalf("got no payment result")
}
// In this state we expect the original payment to
// succeed.
case paymentSuccess:
select {
case err := <-paymentResult:
if err != nil {
t.Fatalf("did not expecte error %v", err)
}
case <-time.After(1 * time.Second):
t.Fatalf("got no payment result")
}
// In this state we expect to receive an error for the
// resent payment made.
case resentPaymentError:
select {
case err := <-resendResult:
if err == nil {
t.Fatalf("expected error")
}
case <-time.After(1 * time.Second):
t.Fatalf("got no payment result")
}
// In this state we expect the resent payment to
// succeed.
case resentPaymentSuccess:
select {
case err := <-resendResult:
if err != nil {
t.Fatalf("did not expect error %v", err)
}
case <-time.After(1 * time.Second):
t.Fatalf("got no payment result")
}
default:
t.Fatalf("unknown step %v", step)
}
}
}
}

77
rpcserver.go
View File

@ -2,7 +2,6 @@ package lnd
import (
"bytes"
"crypto/sha256"
"crypto/tls"
"encoding/hex"
"errors"
@ -2738,33 +2737,6 @@ func (r *rpcServer) SubscribeChannelEvents(req *lnrpc.ChannelEventSubscription,
}
}
// savePayment saves a successfully completed payment to the database for
// historical record keeping.
func (r *rpcServer) savePayment(route *route.Route,
amount lnwire.MilliSatoshi, preImage []byte) error {
paymentPath := make([][33]byte, len(route.Hops))
for i, hop := range route.Hops {
hopPub := hop.PubKeyBytes
copy(paymentPath[i][:], hopPub[:])
}
payment := &channeldb.OutgoingPayment{
Invoice: channeldb.Invoice{
Terms: channeldb.ContractTerm{
Value: amount,
},
CreationDate: time.Now(),
},
Path: paymentPath,
Fee: route.TotalFees(),
TimeLockLength: route.TotalTimeLock,
}
copy(payment.PaymentPreimage[:], preImage)
return r.server.chanDB.AddPayment(payment)
}
// validatePayReqExpiry checks if the passed payment request has expired. In
// the case it has expired, an error will be returned.
func validatePayReqExpiry(payReq *zpay32.Invoice) error {
@ -3126,18 +3098,6 @@ func (r *rpcServer) dispatchPaymentIntent(
}, nil
}
// Calculate amount paid to receiver.
amt := route.TotalAmount - route.TotalFees()
// Save the completed payment to the database for record keeping
// purposes.
err := r.savePayment(route, amt, preImage[:])
if err != nil {
// We weren't able to save the payment, so we return the save
// err, but a nil routing err.
return nil, err
}
return &paymentIntentResponse{
Route: route,
Preimage: preImage,
@ -4149,8 +4109,8 @@ func (r *rpcServer) ListPayments(ctx context.Context,
rpcsLog.Debugf("[ListPayments]")
payments, err := r.server.chanDB.FetchAllPayments()
if err != nil && err != channeldb.ErrNoPaymentsCreated {
payments, err := r.server.chanDB.FetchPayments()
if err != nil {
return nil, err
}
@ -4158,24 +4118,37 @@ func (r *rpcServer) ListPayments(ctx context.Context,
Payments: make([]*lnrpc.Payment, len(payments)),
}
for i, payment := range payments {
path := make([]string, len(payment.Path))
for i, hop := range payment.Path {
path[i] = hex.EncodeToString(hop[:])
// If a payment attempt has been made we can fetch the route.
// Otherwise we'll just populate the RPC response with an empty
// one.
var route route.Route
if payment.Attempt != nil {
route = payment.Attempt.Route
}
path := make([]string, len(route.Hops))
for i, hop := range route.Hops {
path[i] = hex.EncodeToString(hop.PubKeyBytes[:])
}
msatValue := int64(payment.Terms.Value)
satValue := int64(payment.Terms.Value.ToSatoshis())
// If this payment is settled, the preimage will be available.
var preimage lntypes.Preimage
if payment.PaymentPreimage != nil {
preimage = *payment.PaymentPreimage
}
paymentHash := sha256.Sum256(payment.PaymentPreimage[:])
msatValue := int64(payment.Info.Value)
satValue := int64(payment.Info.Value.ToSatoshis())
paymentHash := payment.Info.PaymentHash
paymentsResp.Payments[i] = &lnrpc.Payment{
PaymentHash: hex.EncodeToString(paymentHash[:]),
Value: satValue,
ValueMsat: msatValue,
ValueSat: satValue,
CreationDate: payment.CreationDate.Unix(),
CreationDate: payment.Info.CreationDate.Unix(),
Path: path,
Fee: int64(payment.Fee.ToSatoshis()),
PaymentPreimage: hex.EncodeToString(payment.PaymentPreimage[:]),
Fee: int64(route.TotalFees().ToSatoshis()),
PaymentPreimage: hex.EncodeToString(preimage[:]),
}
}
@ -4188,7 +4161,7 @@ func (r *rpcServer) DeleteAllPayments(ctx context.Context,
rpcsLog.Debugf("[DeleteAllPayments]")
if err := r.server.chanDB.DeleteAllPayments(); err != nil {
if err := r.server.chanDB.DeletePayments(); err != nil {
return nil, err
}

66
server.go
View File

@ -616,42 +616,50 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB, cc *chainControl,
return nil, err
}
queryBandwidth := func(edge *channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi {
// If we aren't on either side of this edge, then we'll
// just thread through the capacity of the edge as we
// know it.
if !bytes.Equal(edge.NodeKey1Bytes[:], selfNode.PubKeyBytes[:]) &&
!bytes.Equal(edge.NodeKey2Bytes[:], selfNode.PubKeyBytes[:]) {
return lnwire.NewMSatFromSatoshis(edge.Capacity)
}
cid := lnwire.NewChanIDFromOutPoint(&edge.ChannelPoint)
link, err := s.htlcSwitch.GetLink(cid)
if err != nil {
// If the link isn't online, then we'll report
// that it has zero bandwidth to the router.
return 0
}
// If the link is found within the switch, but it isn't
// yet eligible to forward any HTLCs, then we'll treat
// it as if it isn't online in the first place.
if !link.EligibleToForward() {
return 0
}
// Otherwise, we'll return the current best estimate
// for the available bandwidth for the link.
return link.Bandwidth()
}
missionControl := routing.NewMissionControl(
chanGraph, selfNode, queryBandwidth,
)
s.chanRouter, err = routing.New(routing.Config{
Graph: chanGraph,
Chain: cc.chainIO,
ChainView: cc.chainView,
Payer: s.htlcSwitch,
Control: channeldb.NewPaymentControl(chanDB),
MissionControl: missionControl,
ChannelPruneExpiry: routing.DefaultChannelPruneExpiry,
GraphPruneInterval: time.Duration(time.Hour),
QueryBandwidth: func(edge *channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi {
// If we aren't on either side of this edge, then we'll
// just thread through the capacity of the edge as we
// know it.
if !bytes.Equal(edge.NodeKey1Bytes[:], selfNode.PubKeyBytes[:]) &&
!bytes.Equal(edge.NodeKey2Bytes[:], selfNode.PubKeyBytes[:]) {
return lnwire.NewMSatFromSatoshis(edge.Capacity)
}
cid := lnwire.NewChanIDFromOutPoint(&edge.ChannelPoint)
link, err := s.htlcSwitch.GetLink(cid)
if err != nil {
// If the link isn't online, then we'll report
// that it has zero bandwidth to the router.
return 0
}
// If the link is found within the switch, but it isn't
// yet eligible to forward any HTLCs, then we'll treat
// it as if it isn't online in the first place.
if !link.EligibleToForward() {
return 0
}
// Otherwise, we'll return the current best estimate
// for the available bandwidth for the link.
return link.Bandwidth()
},
QueryBandwidth: queryBandwidth,
AssumeChannelValid: cfg.Routing.UseAssumeChannelValid(),
NextPaymentID: sequencer.NextID,
})