lnd.xprv/channeldb/duplicate_payments.go

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package channeldb
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"time"
"github.com/btcsuite/btcd/btcec"
"github.com/lightningnetwork/lnd/channeldb/kvdb"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing/route"
)
var (
// duplicatePaymentsBucket 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.
duplicatePaymentsBucket = []byte("payment-duplicate-bucket")
// duplicatePaymentSettleInfoKey is a key used in the payment's
// sub-bucket to store the settle info of the payment.
duplicatePaymentSettleInfoKey = []byte("payment-settle-info")
// duplicatePaymentAttemptInfoKey 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.
duplicatePaymentAttemptInfoKey = []byte("payment-attempt-info")
// duplicatePaymentCreationInfoKey is a key used in the payment's
// sub-bucket to store the creation info of the payment.
duplicatePaymentCreationInfoKey = []byte("payment-creation-info")
// duplicatePaymentFailInfoKey is a key used in the payment's sub-bucket
// to store information about the reason a payment failed.
duplicatePaymentFailInfoKey = []byte("payment-fail-info")
// duplicatePaymentSequenceKey is a key used in the payment's sub-bucket
// to store the sequence number of the payment.
duplicatePaymentSequenceKey = []byte("payment-sequence-key")
)
// duplicateHTLCAttemptInfo contains static information about a specific HTLC
// attempt for a 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 the attempt.
type duplicateHTLCAttemptInfo struct {
// attemptID is the unique ID used for this attempt.
attemptID uint64
// sessionKey is the ephemeral key used for this attempt.
sessionKey *btcec.PrivateKey
// route is the route attempted to send the HTLC.
route route.Route
}
// fetchDuplicatePaymentStatus fetches the payment status of the payment. If the
// payment isn't found, it will default to "StatusUnknown".
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func fetchDuplicatePaymentStatus(bucket kvdb.RBucket) PaymentStatus {
if bucket.Get(duplicatePaymentSettleInfoKey) != nil {
return StatusSucceeded
}
if bucket.Get(duplicatePaymentFailInfoKey) != nil {
return StatusFailed
}
if bucket.Get(duplicatePaymentCreationInfoKey) != nil {
return StatusInFlight
}
return StatusUnknown
}
func deserializeDuplicateHTLCAttemptInfo(r io.Reader) (
*duplicateHTLCAttemptInfo, error) {
a := &duplicateHTLCAttemptInfo{}
err := ReadElements(r, &a.attemptID, &a.sessionKey)
if err != nil {
return nil, err
}
a.route, err = DeserializeRoute(r)
if err != nil {
return nil, err
}
return a, nil
}
func deserializeDuplicatePaymentCreationInfo(r io.Reader) (
*PaymentCreationInfo, error) {
var scratch [8]byte
c := &PaymentCreationInfo{}
if _, err := io.ReadFull(r, c.PaymentHash[:]); err != nil {
return nil, err
}
if _, err := io.ReadFull(r, scratch[:]); err != nil {
return nil, err
}
c.Value = lnwire.MilliSatoshi(byteOrder.Uint64(scratch[:]))
if _, err := io.ReadFull(r, scratch[:]); err != nil {
return nil, err
}
c.CreationTime = time.Unix(int64(byteOrder.Uint64(scratch[:])), 0)
if _, err := io.ReadFull(r, scratch[:4]); err != nil {
return nil, err
}
reqLen := byteOrder.Uint32(scratch[:4])
payReq := make([]byte, reqLen)
if reqLen > 0 {
if _, err := io.ReadFull(r, payReq); err != nil {
return nil, err
}
}
c.PaymentRequest = payReq
return c, nil
}
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func fetchDuplicatePayment(bucket kvdb.RBucket) (*MPPayment, error) {
seqBytes := bucket.Get(duplicatePaymentSequenceKey)
if seqBytes == nil {
return nil, fmt.Errorf("sequence number not found")
}
sequenceNum := binary.BigEndian.Uint64(seqBytes)
// Get the payment status.
paymentStatus := fetchDuplicatePaymentStatus(bucket)
// Get the PaymentCreationInfo.
b := bucket.Get(duplicatePaymentCreationInfoKey)
if b == nil {
return nil, fmt.Errorf("creation info not found")
}
r := bytes.NewReader(b)
creationInfo, err := deserializeDuplicatePaymentCreationInfo(r)
if err != nil {
return nil, err
}
// Get failure reason if available.
var failureReason *FailureReason
b = bucket.Get(duplicatePaymentFailInfoKey)
if b != nil {
reason := FailureReason(b[0])
failureReason = &reason
}
payment := &MPPayment{
SequenceNum: sequenceNum,
Info: creationInfo,
FailureReason: failureReason,
Status: paymentStatus,
}
// Get the HTLCAttemptInfo. It can be absent.
b = bucket.Get(duplicatePaymentAttemptInfoKey)
if b != nil {
r = bytes.NewReader(b)
attempt, err := deserializeDuplicateHTLCAttemptInfo(r)
if err != nil {
return nil, err
}
htlc := HTLCAttempt{
HTLCAttemptInfo: HTLCAttemptInfo{
AttemptID: attempt.attemptID,
Route: attempt.route,
SessionKey: attempt.sessionKey,
},
}
// Get the payment preimage. This is only found for
// successful payments.
b = bucket.Get(duplicatePaymentSettleInfoKey)
if b != nil {
var preimg lntypes.Preimage
copy(preimg[:], b)
htlc.Settle = &HTLCSettleInfo{
Preimage: preimg,
SettleTime: time.Time{},
}
} else {
// Otherwise the payment must have failed.
htlc.Failure = &HTLCFailInfo{
FailTime: time.Time{},
}
}
payment.HTLCs = []HTLCAttempt{htlc}
}
return payment, nil
}
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func fetchDuplicatePayments(paymentHashBucket kvdb.RBucket) ([]*MPPayment,
error) {
var payments []*MPPayment
// 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 := paymentHashBucket.NestedReadBucket(duplicatePaymentsBucket)
if dup == nil {
return nil, nil
}
err := dup.ForEach(func(k, v []byte) error {
subBucket := dup.NestedReadBucket(k)
if subBucket == nil {
// We one bucket for each duplicate to be found.
return fmt.Errorf("non bucket element" +
"in duplicate bucket")
}
p, err := fetchDuplicatePayment(subBucket)
if err != nil {
return err
}
payments = append(payments, p)
return nil
})
if err != nil {
return nil, err
}
return payments, nil
}