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". 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 } 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 } 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 }