13523316608

Committed 25 Feb 2025 02:12PM UTC coverage: 49.351% (-9.5%) from 58.835%

Build # 13523316608

Build Type

Pull #9549

github

Committed by

yyforyongyu

Commit Message

routing/chainview: refactor `TestFilteredChainView`

So each test has its own miner and chainView.

Pull Request Pull Request #9549: Fix unit test flake `TestHistoricalConfDetailsTxIndex`

Run Details

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69.11

/channeldb/payment_control.go

package channeldb

import (
        "bytes"
        "encoding/binary"
        "errors"
        "fmt"
        "io"
        "sync"

        "github.com/lightningnetwork/lnd/kvdb"
        "github.com/lightningnetwork/lnd/lntypes"
)

const (
        // paymentSeqBlockSize is the block size used when we batch allocate
        // payment sequences for future payments.
        paymentSeqBlockSize = 1000
)

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")

        // ErrPaymentExists is returned when we try to initialize an already
        // existing payment that is not failed.
        ErrPaymentExists = errors.New("payment already exists")

        // ErrPaymentInternal is returned when performing the payment has a
        // conflicting state, such as,
        // - payment has StatusSucceeded but remaining amount is not zero.
        // - payment has StatusInitiated but remaining amount is zero.
        // - payment has StatusFailed but remaining amount is zero.
        ErrPaymentInternal = errors.New("internal error")

        // ErrPaymentNotInitiated is returned if the payment wasn't initiated.
        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 alter
        // 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")

        // ErrPaymentTerminal is returned if we attempt to alter a payment that
        // already has reached a terminal condition.
        ErrPaymentTerminal = errors.New("payment has reached terminal " +
                "condition")

        // ErrAttemptAlreadySettled is returned if we try to alter an already
        // settled HTLC attempt.
        ErrAttemptAlreadySettled = errors.New("attempt already settled")

        // ErrAttemptAlreadyFailed is returned if we try to alter an already
        // failed HTLC attempt.
        ErrAttemptAlreadyFailed = errors.New("attempt already failed")

        // ErrValueMismatch is returned if we try to register a non-MPP attempt
        // with an amount that doesn't match the payment amount.
        ErrValueMismatch = errors.New("attempted value doesn't match payment " +
                "amount")

        // ErrValueExceedsAmt is returned if we try to register an attempt that
        // would take the total sent amount above the payment amount.
        ErrValueExceedsAmt = errors.New("attempted value exceeds payment " +
                "amount")

        // ErrNonMPPayment is returned if we try to register an MPP attempt for
        // a payment that already has a non-MPP attempt registered.
        ErrNonMPPayment = errors.New("payment has non-MPP attempts")

        // ErrMPPayment is returned if we try to register a non-MPP attempt for
        // a payment that already has an MPP attempt registered.
        ErrMPPayment = errors.New("payment has MPP attempts")

        // ErrMPPRecordInBlindedPayment is returned if we try to register an
        // attempt with an MPP record for a payment to a blinded path.
        ErrMPPRecordInBlindedPayment = errors.New("blinded payment cannot " +
                "contain MPP records")

        // ErrBlindedPaymentTotalAmountMismatch is returned if we try to
        // register an HTLC shard to a blinded route where the total amount
        // doesn't match existing shards.
        ErrBlindedPaymentTotalAmountMismatch = errors.New("blinded path " +
                "total amount mismatch")

        // ErrMPPPaymentAddrMismatch is returned if we try to register an MPP
        // shard where the payment address doesn't match existing shards.
        ErrMPPPaymentAddrMismatch = errors.New("payment address mismatch")

        // ErrMPPTotalAmountMismatch is returned if we try to register an MPP
        // shard where the total amount doesn't match existing shards.
        ErrMPPTotalAmountMismatch = errors.New("mp payment total amount " +
                "mismatch")

        // ErrPaymentPendingSettled is returned when we try to add a new
        // attempt to a payment that has at least one of its HTLCs settled.
        ErrPaymentPendingSettled = errors.New("payment has settled htlcs")

        // ErrPaymentPendingFailed is returned when we try to add a new attempt
        // to a payment that already has a failure reason.
        ErrPaymentPendingFailed = errors.New("payment has failure reason")

        // ErrSentExceedsTotal is returned if the payment's current total sent
        // amount exceed the total amount.
        ErrSentExceedsTotal = errors.New("total sent exceeds total amount")

        // errNoAttemptInfo is returned when no attempt info is stored yet.
        errNoAttemptInfo = errors.New("unable to find attempt info for " +
                "inflight payment")

        // errNoSequenceNrIndex is returned when an attempt to lookup a payment
        // index is made for a sequence number that is not indexed.
        errNoSequenceNrIndex = errors.New("payment sequence number index " +
                "does not exist")
)

// PaymentControl implements persistence for payments and payment attempts.
type PaymentControl struct {
        paymentSeqMx     sync.Mutex
        currPaymentSeq   uint64
        storedPaymentSeq uint64
        db               *DB
}

// NewPaymentControl creates a new instance of the PaymentControl.
func NewPaymentControl(db *DB) *PaymentControl {
        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. When this
// method returns successfully, the payment is guaranteed to be in the InFlight
// state.
func (p *PaymentControl) InitPayment(paymentHash lntypes.Hash,
        info *PaymentCreationInfo) error {

        // 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 := p.nextPaymentSequence()
        if err != nil {
                return err
        }

        var b bytes.Buffer
        if err := serializePaymentCreationInfo(&b, info); err != nil {
                return err
        }
        infoBytes := b.Bytes()

        var updateErr error
        err = kvdb.Batch(p.db.Backend, func(tx kvdb.RwTx) error {
                // Reset the update error, to avoid carrying over an error
                // from a previous execution of the batched db transaction.
                updateErr = nil

                prefetchPayment(tx, paymentHash)
                bucket, err := createPaymentBucket(tx, paymentHash)
                if err != nil {
                        return err
                }

                // Get the existing status of this payment, if any.
                paymentStatus, err := fetchPaymentStatus(bucket)

                switch {
                // If no error is returned, it means we already have this
                // payment. We'll check the status to decide whether we allow
                // retrying the payment or return a specific error.
                case err == nil:
                        if err := paymentStatus.initializable(); err != nil {
                                updateErr = err
                                return nil
                        }

                // Otherwise, if the error is not `ErrPaymentNotInitiated`,
                // we'll return the error.
                case !errors.Is(err, ErrPaymentNotInitiated):
                        return err
                }

                // Before we set our new sequence number, we check whether this
                // payment has a previously set sequence number and remove its
                // index entry if it exists. This happens in the case where we
                // have a previously attempted payment which was left in a state
                // where we can retry.
                seqBytes := bucket.Get(paymentSequenceKey)
                if seqBytes != nil {
                        indexBucket := tx.ReadWriteBucket(paymentsIndexBucket)
                        if err := indexBucket.Delete(seqBytes); err != nil {
                                return err
                        }
                }

                // Once we have obtained a sequence number, we add an entry
                // to our index bucket which will map the sequence number to
                // our payment identifier.
                err = createPaymentIndexEntry(
                        tx, sequenceNum, info.PaymentIdentifier,
                )
                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 HTLCs 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.DeleteNestedBucket(paymentHtlcsBucket)
                if err != nil && err != kvdb.ErrBucketNotFound {
                        return err
                }

                // Also delete any lingering failure info now that we are
                // re-attempting.
                return bucket.Delete(paymentFailInfoKey)
        })
        if err != nil {
                return fmt.Errorf("unable to init payment: %w", err)
        }

        return updateErr
}

// DeleteFailedAttempts deletes all failed htlcs for a payment if configured
// by the PaymentControl db.
func (p *PaymentControl) DeleteFailedAttempts(hash lntypes.Hash) error {
        if !p.db.keepFailedPaymentAttempts {
                const failedHtlcsOnly = true
                err := p.db.DeletePayment(hash, failedHtlcsOnly)
                if err != nil {
                        return err
                }
        }
        return nil
}

// paymentIndexTypeHash is a payment index type which indicates that we have
// created an index of payment sequence number to payment hash.
type paymentIndexType uint8

// paymentIndexTypeHash is a payment index type which indicates that we have
// created an index of payment sequence number to payment hash.
const paymentIndexTypeHash paymentIndexType = 0

// createPaymentIndexEntry creates a payment hash typed index for a payment. The
// index produced contains a payment index type (which can be used in future to
// signal different payment index types) and the payment identifier.
func createPaymentIndexEntry(tx kvdb.RwTx, sequenceNumber []byte,
        id lntypes.Hash) error {

        var b bytes.Buffer
        if err := WriteElements(&b, paymentIndexTypeHash, id[:]); err != nil {
                return err
        }

        indexes := tx.ReadWriteBucket(paymentsIndexBucket)
        return indexes.Put(sequenceNumber, b.Bytes())
}

// deserializePaymentIndex deserializes a payment index entry. This function
// currently only supports deserialization of payment hash indexes, and will
// fail for other types.
func deserializePaymentIndex(r io.Reader) (lntypes.Hash, error) {
        var (
                indexType   paymentIndexType
                paymentHash []byte
        )

        if err := ReadElements(r, &indexType, &paymentHash); err != nil {
                return lntypes.Hash{}, err
        }

        // While we only have on payment index type, we do not need to use our
        // index type to deserialize the index. However, we sanity check that
        // this type is as expected, since we had to read it out anyway.
        if indexType != paymentIndexTypeHash {
                return lntypes.Hash{}, fmt.Errorf("unknown payment index "+
                        "type: %v", indexType)
        }

        hash, err := lntypes.MakeHash(paymentHash)
        if err != nil {
                return lntypes.Hash{}, err
        }

        return hash, nil
}

// RegisterAttempt atomically records the provided HTLCAttemptInfo to the
// DB.
func (p *PaymentControl) RegisterAttempt(paymentHash lntypes.Hash,
        attempt *HTLCAttemptInfo) (*MPPayment, error) {

        // Serialize the information before opening the db transaction.
        var a bytes.Buffer
        err := serializeHTLCAttemptInfo(&a, attempt)
        if err != nil {
                return nil, err
        }
        htlcInfoBytes := a.Bytes()

        htlcIDBytes := make([]byte, 8)
        binary.BigEndian.PutUint64(htlcIDBytes, attempt.AttemptID)

        var payment *MPPayment
        err = kvdb.Batch(p.db.Backend, func(tx kvdb.RwTx) error {
                prefetchPayment(tx, paymentHash)
                bucket, err := fetchPaymentBucketUpdate(tx, paymentHash)
                if err != nil {
                        return err
                }

                payment, err = fetchPayment(bucket)
                if err != nil {
                        return err
                }

                // Check if registering a new attempt is allowed.
                if err := payment.Registrable(); err != nil {
                        return err
                }

                // If the final hop has encrypted data, then we know this is a
                // blinded payment. In blinded payments, MPP records are not set
                // for split payments and the recipient is responsible for using
                // a consistent PathID across the various encrypted data
                // payloads that we received from them for this payment. All we
                // need to check is that the total amount field for each HTLC
                // in the split payment is correct.
                isBlinded := len(attempt.Route.FinalHop().EncryptedData) != 0

                // Make sure any existing shards match the new one with regards
                // to MPP options.
                mpp := attempt.Route.FinalHop().MPP

                // MPP records should not be set for attempts to blinded paths.
                if isBlinded && mpp != nil {
                        return ErrMPPRecordInBlindedPayment
                }

                for _, h := range payment.InFlightHTLCs() {
                        hMpp := h.Route.FinalHop().MPP

                        // If this is a blinded payment, then no existing HTLCs
                        // should have MPP records.
                        if isBlinded && hMpp != nil {
                                return ErrMPPRecordInBlindedPayment
                        }

                        // If this is a blinded payment, then we just need to
                        // check that the TotalAmtMsat field for this shard
                        // is equal to that of any other shard in the same
                        // payment.
                        if isBlinded {
                                if attempt.Route.FinalHop().TotalAmtMsat !=
                                        h.Route.FinalHop().TotalAmtMsat {

                                        //nolint:ll
                                        return ErrBlindedPaymentTotalAmountMismatch
                                }

                                continue
                        }

                        switch {
                        // We tried to register a non-MPP attempt for a MPP
                        // payment.
                        case mpp == nil && hMpp != nil:
                                return ErrMPPayment

                        // We tried to register a MPP shard for a non-MPP
                        // payment.
                        case mpp != nil && hMpp == nil:
                                return ErrNonMPPayment

                        // Non-MPP payment, nothing more to validate.
                        case mpp == nil:
                                continue
                        }

                        // Check that MPP options match.
                        if mpp.PaymentAddr() != hMpp.PaymentAddr() {
                                return ErrMPPPaymentAddrMismatch
                        }

                        if mpp.TotalMsat() != hMpp.TotalMsat() {
                                return ErrMPPTotalAmountMismatch
                        }
                }

                // If this is a non-MPP attempt, it must match the total amount
                // exactly. Note that a blinded payment is considered an MPP
                // attempt.
                amt := attempt.Route.ReceiverAmt()
                if !isBlinded && mpp == nil && amt != payment.Info.Value {
                        return ErrValueMismatch
                }

                // Ensure we aren't sending more than the total payment amount.
                sentAmt, _ := payment.SentAmt()
                if sentAmt+amt > payment.Info.Value {
                        return fmt.Errorf("%w: attempted=%v, payment amount="+
                                "%v", ErrValueExceedsAmt, sentAmt+amt,
                                payment.Info.Value)
                }

                htlcsBucket, err := bucket.CreateBucketIfNotExists(
                        paymentHtlcsBucket,
                )
                if err != nil {
                        return err
                }

                err = htlcsBucket.Put(
                        htlcBucketKey(htlcAttemptInfoKey, htlcIDBytes),
                        htlcInfoBytes,
                )
                if err != nil {
                        return err
                }

                // Retrieve attempt info for the notification.
                payment, err = fetchPayment(bucket)
                return err
        })
        if err != nil {
                return nil, err
        }

        return payment, err
}

// SettleAttempt marks the given attempt settled with the preimage. If this is
// a multi shard payment, this might implicitly mean that the full payment
// succeeded.
//
// 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) SettleAttempt(hash lntypes.Hash,
        attemptID uint64, settleInfo *HTLCSettleInfo) (*MPPayment, error) {

        var b bytes.Buffer
        if err := serializeHTLCSettleInfo(&b, settleInfo); err != nil {
                return nil, err
        }
        settleBytes := b.Bytes()

        return p.updateHtlcKey(hash, attemptID, htlcSettleInfoKey, settleBytes)
}

// FailAttempt marks the given payment attempt failed.
func (p *PaymentControl) FailAttempt(hash lntypes.Hash,
        attemptID uint64, failInfo *HTLCFailInfo) (*MPPayment, error) {

        var b bytes.Buffer
        if err := serializeHTLCFailInfo(&b, failInfo); err != nil {
                return nil, err
        }
        failBytes := b.Bytes()

        return p.updateHtlcKey(hash, attemptID, htlcFailInfoKey, failBytes)
}

// updateHtlcKey updates a database key for the specified htlc.
func (p *PaymentControl) updateHtlcKey(paymentHash lntypes.Hash,
        attemptID uint64, key, value []byte) (*MPPayment, error) {

        aid := make([]byte, 8)
        binary.BigEndian.PutUint64(aid, attemptID)

        var payment *MPPayment
        err := kvdb.Batch(p.db.Backend, func(tx kvdb.RwTx) error {
                payment = nil

                prefetchPayment(tx, paymentHash)
                bucket, err := fetchPaymentBucketUpdate(tx, paymentHash)
                if err != nil {
                        return err
                }

                p, err := fetchPayment(bucket)
                if err != nil {
                        return err
                }

                // We can only update keys of in-flight payments. We allow
                // updating keys even if the payment has reached a terminal
                // condition, since the HTLC outcomes must still be updated.
                if err := p.Status.updatable(); err != nil {
                        return err
                }

                htlcsBucket := bucket.NestedReadWriteBucket(paymentHtlcsBucket)
                if htlcsBucket == nil {
                        return fmt.Errorf("htlcs bucket not found")
                }

                if htlcsBucket.Get(htlcBucketKey(htlcAttemptInfoKey, aid)) == nil {
                        return fmt.Errorf("HTLC with ID %v not registered",
                                attemptID)
                }

                // Make sure the shard is not already failed or settled.
                if htlcsBucket.Get(htlcBucketKey(htlcFailInfoKey, aid)) != nil {
                        return ErrAttemptAlreadyFailed
                }

                if htlcsBucket.Get(htlcBucketKey(htlcSettleInfoKey, aid)) != nil {
                        return ErrAttemptAlreadySettled
                }

                // Add or update the key for this htlc.
                err = htlcsBucket.Put(htlcBucketKey(key, aid), value)
                if err != nil {
                        return err
                }

                // Retrieve attempt info for the notification.
                payment, err = fetchPayment(bucket)
                return err
        })
        if err != nil {
                return nil, err
        }

        return payment, err
}

// 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) (*MPPayment, error) {

        var (
                updateErr error
                payment   *MPPayment
        )
        err := kvdb.Batch(p.db.Backend, func(tx kvdb.RwTx) error {
                // Reset the update error, to avoid carrying over an error
                // from a previous execution of the batched db transaction.
                updateErr = nil
                payment = nil

                prefetchPayment(tx, paymentHash)
                bucket, err := fetchPaymentBucketUpdate(tx, paymentHash)
                if err == ErrPaymentNotInitiated {
                        updateErr = ErrPaymentNotInitiated
                        return nil
                } else if err != nil {
                        return err
                }

                // We mark the payment as failed as long as it is known. This
                // lets the last attempt to fail with a terminal write its
                // failure to the PaymentControl without synchronizing with
                // other attempts.
                _, err = fetchPaymentStatus(bucket)
                if errors.Is(err, ErrPaymentNotInitiated) {
                        updateErr = ErrPaymentNotInitiated
                        return nil
                } else if err != nil {
                        return err
                }

                // Put the failure reason in the bucket for record keeping.
                v := []byte{byte(reason)}
                err = bucket.Put(paymentFailInfoKey, v)
                if err != nil {
                        return err
                }

                // Retrieve attempt info for the notification, if available.
                payment, err = fetchPayment(bucket)
                if err != nil {
                        return err
                }

                return nil
        })
        if err != nil {
                return nil, err
        }

        return payment, updateErr
}

// FetchPayment returns information about a payment from the database.
func (p *PaymentControl) FetchPayment(paymentHash lntypes.Hash) (
        *MPPayment, error) {

        var payment *MPPayment
        err := kvdb.View(p.db, func(tx kvdb.RTx) error {
                prefetchPayment(tx, paymentHash)
                bucket, err := fetchPaymentBucket(tx, paymentHash)
                if err != nil {
                        return err
                }

                payment, err = fetchPayment(bucket)

                return err
        }, func() {
                payment = nil
        })
        if err != nil {
                return nil, err
        }

        return payment, nil
}

// prefetchPayment attempts to prefetch as much of the payment as possible to
// reduce DB roundtrips.
func prefetchPayment(tx kvdb.RTx, paymentHash lntypes.Hash) {
        rb := kvdb.RootBucket(tx)
        kvdb.Prefetch(
                rb,
                []string{
                        // Prefetch all keys in the payment's bucket.
                        string(paymentsRootBucket),
                        string(paymentHash[:]),
                },
                []string{
                        // Prefetch all keys in the payment's htlc bucket.
                        string(paymentsRootBucket),
                        string(paymentHash[:]),
                        string(paymentHtlcsBucket),
                },
        )
}

// createPaymentBucket creates or fetches the sub-bucket assigned to this
// payment hash.
func createPaymentBucket(tx kvdb.RwTx, paymentHash lntypes.Hash) (
        kvdb.RwBucket, error) {

        payments, err := tx.CreateTopLevelBucket(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 kvdb.RTx, paymentHash lntypes.Hash) (
        kvdb.RBucket, error) {

        payments := tx.ReadBucket(paymentsRootBucket)
        if payments == nil {
                return nil, ErrPaymentNotInitiated
        }

        bucket := payments.NestedReadBucket(paymentHash[:])
        if bucket == nil {
                return nil, ErrPaymentNotInitiated
        }

        return bucket, nil

}

// fetchPaymentBucketUpdate is identical to fetchPaymentBucket, but it returns a
// bucket that can be written to.
func fetchPaymentBucketUpdate(tx kvdb.RwTx, paymentHash lntypes.Hash) (
        kvdb.RwBucket, error) {

        payments := tx.ReadWriteBucket(paymentsRootBucket)
        if payments == nil {
                return nil, ErrPaymentNotInitiated
        }

        bucket := payments.NestedReadWriteBucket(paymentHash[:])
        if bucket == nil {
                return nil, ErrPaymentNotInitiated
        }

        return bucket, nil
}

// nextPaymentSequence returns the next sequence number to store for a new
// payment.
func (p *PaymentControl) nextPaymentSequence() ([]byte, error) {
        p.paymentSeqMx.Lock()
        defer p.paymentSeqMx.Unlock()

        // Set a new upper bound in the DB every 1000 payments to avoid
        // conflicts on the sequence when using etcd.
        if p.currPaymentSeq == p.storedPaymentSeq {
                var currPaymentSeq, newUpperBound uint64
                if err := kvdb.Update(p.db.Backend, func(tx kvdb.RwTx) error {
                        paymentsBucket, err := tx.CreateTopLevelBucket(
                                paymentsRootBucket,
                        )
                        if err != nil {
                                return err
                        }

                        currPaymentSeq = paymentsBucket.Sequence()
                        newUpperBound = currPaymentSeq + paymentSeqBlockSize
                        return paymentsBucket.SetSequence(newUpperBound)
                }, func() {}); err != nil {
                        return nil, err
                }

                // We lazy initialize the cached currPaymentSeq here using the
                // first nextPaymentSequence() call. This if statement will auto
                // initialize our stored currPaymentSeq, since by default both
                // this variable and storedPaymentSeq are zero which in turn
                // will have us fetch the current values from the DB.
                if p.currPaymentSeq == 0 {
                        p.currPaymentSeq = currPaymentSeq
                }

                p.storedPaymentSeq = newUpperBound
        }

        p.currPaymentSeq++
        b := make([]byte, 8)
        binary.BigEndian.PutUint64(b, p.currPaymentSeq)

        return b, nil
}

// fetchPaymentStatus fetches the payment status of the payment. If the payment
// isn't found, it will return error `ErrPaymentNotInitiated`.
func fetchPaymentStatus(bucket kvdb.RBucket) (PaymentStatus, error) {
        // Creation info should be set for all payments, regardless of state.
        // If not, it is unknown.
        if bucket.Get(paymentCreationInfoKey) == nil {
                return 0, ErrPaymentNotInitiated
        }

        payment, err := fetchPayment(bucket)
        if err != nil {
                return 0, err
        }

        return payment.Status, nil
}

// FetchInFlightPayments returns all payments with status InFlight.
func (p *PaymentControl) FetchInFlightPayments() ([]*MPPayment, error) {
        var inFlights []*MPPayment
        err := kvdb.View(p.db, func(tx kvdb.RTx) error {
                payments := tx.ReadBucket(paymentsRootBucket)
                if payments == nil {
                        return nil
                }

                return payments.ForEach(func(k, _ []byte) error {
                        bucket := payments.NestedReadBucket(k)
                        if bucket == nil {
                                return fmt.Errorf("non bucket element")
                        }

                        p, err := fetchPayment(bucket)
                        if err != nil {
                                return err
                        }

                        // Skip the payment if it's terminated.
                        if p.Terminated() {
                                return nil
                        }

                        inFlights = append(inFlights, p)
                        return nil
                })
        }, func() {
                inFlights = nil
        })
        if err != nil {
                return nil, err
        }

        return inFlights, nil
}

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