13035292482

Committed 29 Jan 2025 03:59PM UTC coverage: 49.3% (-9.5%) from 58.777%

Build # 13035292482

Build Type

Pull #9456

github

Committed by

mohamedawnallah

Commit Message

docs: update release-notes-0.19.0.md

In this commit, we warn users about the removal
of RPCs `SendToRoute`, `SendToRouteSync`, `SendPayment`,
and `SendPaymentSync` in the next release 0.20.

Pull Request Pull Request #9456: lnrpc+docs: deprecate warning `SendToRoute`, `SendToRouteSync`, `SendPayment`, and `SendPaymentSync` in Release 0.19

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69.63

/channeldb/revocation_log.go

package channeldb

import (
        "bytes"
        "errors"
        "io"
        "math"

        "github.com/btcsuite/btcd/btcutil"
        "github.com/lightningnetwork/lnd/fn/v2"
        "github.com/lightningnetwork/lnd/kvdb"
        "github.com/lightningnetwork/lnd/lntypes"
        "github.com/lightningnetwork/lnd/lnwire"
        "github.com/lightningnetwork/lnd/tlv"
)

const (
        // OutputIndexEmpty is used when the output index doesn't exist.
        OutputIndexEmpty = math.MaxUint16
)

type (
        // BigSizeAmount is a type alias for a TLV record of a btcutil.Amount.
        BigSizeAmount = tlv.BigSizeT[btcutil.Amount]

        // BigSizeMilliSatoshi is a type alias for a TLV record of a
        // lnwire.MilliSatoshi.
        BigSizeMilliSatoshi = tlv.BigSizeT[lnwire.MilliSatoshi]
)

var (
        // revocationLogBucketDeprecated is dedicated for storing the necessary
        // delta state between channel updates required to re-construct a past
        // state in order to punish a counterparty attempting a non-cooperative
        // channel closure. This key should be accessed from within the
        // sub-bucket of a target channel, identified by its channel point.
        //
        // Deprecated: This bucket is kept for read-only in case the user
        // choose not to migrate the old data.
        revocationLogBucketDeprecated = []byte("revocation-log-key")

        // revocationLogBucket is a sub-bucket under openChannelBucket. This
        // sub-bucket is dedicated for storing the minimal info required to
        // re-construct a past state in order to punish a counterparty
        // attempting a non-cooperative channel closure.
        revocationLogBucket = []byte("revocation-log")

        // ErrLogEntryNotFound is returned when we cannot find a log entry at
        // the height requested in the revocation log.
        ErrLogEntryNotFound = errors.New("log entry not found")

        // ErrOutputIndexTooBig is returned when the output index is greater
        // than uint16.
        ErrOutputIndexTooBig = errors.New("output index is over uint16")
)

// SparsePayHash is a type alias for a 32 byte array, which when serialized is
// able to save some space by not including an empty payment hash on disk.
type SparsePayHash [32]byte

// NewSparsePayHash creates a new SparsePayHash from a 32 byte array.
func NewSparsePayHash(rHash [32]byte) SparsePayHash {
        return SparsePayHash(rHash)
}

// Record returns a tlv record for the SparsePayHash.
func (s *SparsePayHash) Record() tlv.Record {
        // We use a zero for the type here, as this'll be used along with the
        // RecordT type.
        return tlv.MakeDynamicRecord(
                0, s, s.hashLen,
                sparseHashEncoder, sparseHashDecoder,
        )
}

// hashLen is used by MakeDynamicRecord to return the size of the RHash.
//
// NOTE: for zero hash, we return a length 0.
func (s *SparsePayHash) hashLen() uint64 {
        if bytes.Equal(s[:], lntypes.ZeroHash[:]) {
                return 0
        }

        return 32
}

// sparseHashEncoder is the customized encoder which skips encoding the empty
// hash.
func sparseHashEncoder(w io.Writer, val interface{}, buf *[8]byte) error {
        v, ok := val.(*SparsePayHash)
        if !ok {
                return tlv.NewTypeForEncodingErr(val, "SparsePayHash")
        }

        // If the value is an empty hash, we will skip encoding it.
        if bytes.Equal(v[:], lntypes.ZeroHash[:]) {
                return nil
        }

        vArray := (*[32]byte)(v)

        return tlv.EBytes32(w, vArray, buf)
}

// sparseHashDecoder is the customized decoder which skips decoding the empty
// hash.
func sparseHashDecoder(r io.Reader, val interface{}, buf *[8]byte,
        l uint64) error {

        v, ok := val.(*SparsePayHash)
        if !ok {
                return tlv.NewTypeForEncodingErr(val, "SparsePayHash")
        }

        // If the length is zero, we will skip encoding the empty hash.
        if l == 0 {
                return nil
        }

        vArray := (*[32]byte)(v)

        return tlv.DBytes32(r, vArray, buf, 32)
}

// HTLCEntry specifies the minimal info needed to be stored on disk for ALL the
// historical HTLCs, which is useful for constructing RevocationLog when a
// breach is detected.
// The actual size of each HTLCEntry varies based on its RHash and Amt(sat),
// summarized as follows,
//
//        | RHash empty | Amt<=252 | Amt<=65,535 | Amt<=4,294,967,295 | otherwise |
//        |:-----------:|:--------:|:-----------:|:------------------:|:---------:|
//        |     true    |    19    |      21     |         23         |     26    |
//        |     false   |    51    |      53     |         55         |     58    |
//
// So the size varies from 19 bytes to 58 bytes, where most likely to be 23 or
// 55 bytes.
//
// NOTE: all the fields saved to disk use the primitive go types so they can be
// made into tlv records without further conversion.
type HTLCEntry struct {
        // RHash is the payment hash of the HTLC.
        RHash tlv.RecordT[tlv.TlvType0, SparsePayHash]

        // RefundTimeout is the absolute timeout on the HTLC that the sender
        // must wait before reclaiming the funds in limbo.
        RefundTimeout tlv.RecordT[tlv.TlvType1, uint32]

        // OutputIndex is the output index for this particular HTLC output
        // within the commitment transaction.
        //
        // NOTE: we use uint16 instead of int32 here to save us 2 bytes, which
        // gives us a max number of HTLCs of 65K.
        OutputIndex tlv.RecordT[tlv.TlvType2, uint16]

        // Incoming denotes whether we're the receiver or the sender of this
        // HTLC.
        Incoming tlv.RecordT[tlv.TlvType3, bool]

        // Amt is the amount of satoshis this HTLC escrows.
        Amt tlv.RecordT[tlv.TlvType4, tlv.BigSizeT[btcutil.Amount]]

        // CustomBlob is an optional blob that can be used to store information
        // specific to revocation handling for a custom channel type.
        CustomBlob tlv.OptionalRecordT[tlv.TlvType5, tlv.Blob]

        // HtlcIndex is the index of the HTLC in the channel.
        HtlcIndex tlv.OptionalRecordT[tlv.TlvType6, uint16]
}

// toTlvStream converts an HTLCEntry record into a tlv representation.
func (h *HTLCEntry) toTlvStream() (*tlv.Stream, error) {
        records := []tlv.Record{
                h.RHash.Record(),
                h.RefundTimeout.Record(),
                h.OutputIndex.Record(),
                h.Incoming.Record(),
                h.Amt.Record(),
        }

        h.CustomBlob.WhenSome(func(r tlv.RecordT[tlv.TlvType5, tlv.Blob]) {
                records = append(records, r.Record())
        })

        h.HtlcIndex.WhenSome(func(r tlv.RecordT[tlv.TlvType6, uint16]) {
                records = append(records, r.Record())
        })

        tlv.SortRecords(records)

        return tlv.NewStream(records...)
}

// NewHTLCEntryFromHTLC creates a new HTLCEntry from an HTLC.
func NewHTLCEntryFromHTLC(htlc HTLC) (*HTLCEntry, error) {
        h := &HTLCEntry{
                RHash: tlv.NewRecordT[tlv.TlvType0](
                        NewSparsePayHash(htlc.RHash),
                ),
                RefundTimeout: tlv.NewPrimitiveRecord[tlv.TlvType1](
                        htlc.RefundTimeout,
                ),
                OutputIndex: tlv.NewPrimitiveRecord[tlv.TlvType2](
                        uint16(htlc.OutputIndex),
                ),
                Incoming: tlv.NewPrimitiveRecord[tlv.TlvType3](htlc.Incoming),
                Amt: tlv.NewRecordT[tlv.TlvType4](
                        tlv.NewBigSizeT(htlc.Amt.ToSatoshis()),
                ),
                HtlcIndex: tlv.SomeRecordT(tlv.NewPrimitiveRecord[tlv.TlvType6](
                        uint16(htlc.HtlcIndex),
                )),
        }

        if len(htlc.CustomRecords) != 0 {
                blob, err := htlc.CustomRecords.Serialize()
                if err != nil {
                        return nil, err
                }

                h.CustomBlob = tlv.SomeRecordT(
                        tlv.NewPrimitiveRecord[tlv.TlvType5, tlv.Blob](blob),
                )
        }

        return h, nil
}

// RevocationLog stores the info needed to construct a breach retribution. Its
// fields can be viewed as a subset of a ChannelCommitment's. In the database,
// all historical versions of the RevocationLog are saved using the
// CommitHeight as the key.
type RevocationLog struct {
        // OurOutputIndex specifies our output index in this commitment. In a
        // remote commitment transaction, this is the to remote output index.
        OurOutputIndex tlv.RecordT[tlv.TlvType0, uint16]

        // TheirOutputIndex specifies their output index in this commitment. In
        // a remote commitment transaction, this is the to local output index.
        TheirOutputIndex tlv.RecordT[tlv.TlvType1, uint16]

        // CommitTxHash is the hash of the latest version of the commitment
        // state, broadcast able by us.
        CommitTxHash tlv.RecordT[tlv.TlvType2, [32]byte]

        // HTLCEntries is the set of HTLCEntry's that are pending at this
        // particular commitment height.
        HTLCEntries []*HTLCEntry

        // OurBalance is the current available balance within the channel
        // directly spendable by us. In other words, it is the value of the
        // to_remote output on the remote parties' commitment transaction.
        //
        // NOTE: this is an option so that it is clear if the value is zero or
        // nil. Since migration 30 of the channeldb initially did not include
        // this field, it could be the case that the field is not present for
        // all revocation logs.
        OurBalance tlv.OptionalRecordT[tlv.TlvType3, BigSizeMilliSatoshi]

        // TheirBalance is the current available balance within the channel
        // directly spendable by the remote node. In other words, it is the
        // value of the to_local output on the remote parties' commitment.
        //
        // NOTE: this is an option so that it is clear if the value is zero or
        // nil. Since migration 30 of the channeldb initially did not include
        // this field, it could be the case that the field is not present for
        // all revocation logs.
        TheirBalance tlv.OptionalRecordT[tlv.TlvType4, BigSizeMilliSatoshi]

        // CustomBlob is an optional blob that can be used to store information
        // specific to a custom channel type. This information is only created
        // at channel funding time, and after wards is to be considered
        // immutable.
        CustomBlob tlv.OptionalRecordT[tlv.TlvType5, tlv.Blob]
}

// NewRevocationLog creates a new RevocationLog from the given parameters.
func NewRevocationLog(ourOutputIndex uint16, theirOutputIndex uint16,
        commitHash [32]byte, ourBalance,
        theirBalance fn.Option[lnwire.MilliSatoshi], htlcs []*HTLCEntry,
        customBlob fn.Option[tlv.Blob]) RevocationLog {

        rl := RevocationLog{
                OurOutputIndex: tlv.NewPrimitiveRecord[tlv.TlvType0](
                        ourOutputIndex,
                ),
                TheirOutputIndex: tlv.NewPrimitiveRecord[tlv.TlvType1](
                        theirOutputIndex,
                ),
                CommitTxHash: tlv.NewPrimitiveRecord[tlv.TlvType2](commitHash),
                HTLCEntries:  htlcs,
        }

        ourBalance.WhenSome(func(balance lnwire.MilliSatoshi) {
                rl.OurBalance = tlv.SomeRecordT(tlv.NewRecordT[tlv.TlvType3](
                        tlv.NewBigSizeT(balance),
                ))
        })

        theirBalance.WhenSome(func(balance lnwire.MilliSatoshi) {
                rl.TheirBalance = tlv.SomeRecordT(tlv.NewRecordT[tlv.TlvType4](
                        tlv.NewBigSizeT(balance),
                ))
        })

        customBlob.WhenSome(func(blob tlv.Blob) {
                rl.CustomBlob = tlv.SomeRecordT(
                        tlv.NewPrimitiveRecord[tlv.TlvType5, tlv.Blob](blob),
                )
        })

        return rl
}

// putRevocationLog uses the fields `CommitTx` and `Htlcs` from a
// ChannelCommitment to construct a revocation log entry and saves them to
// disk. It also saves our output index and their output index, which are
// useful when creating breach retribution.
func putRevocationLog(bucket kvdb.RwBucket, commit *ChannelCommitment,
        ourOutputIndex, theirOutputIndex uint32, noAmtData bool) error {

        // Sanity check that the output indexes can be safely converted.
        if ourOutputIndex > math.MaxUint16 {
                return ErrOutputIndexTooBig
        }
        if theirOutputIndex > math.MaxUint16 {
                return ErrOutputIndexTooBig
        }

        rl := &RevocationLog{
                OurOutputIndex: tlv.NewPrimitiveRecord[tlv.TlvType0](
                        uint16(ourOutputIndex),
                ),
                TheirOutputIndex: tlv.NewPrimitiveRecord[tlv.TlvType1](
                        uint16(theirOutputIndex),
                ),
                CommitTxHash: tlv.NewPrimitiveRecord[tlv.TlvType2, [32]byte](
                        commit.CommitTx.TxHash(),
                ),
                HTLCEntries: make([]*HTLCEntry, 0, len(commit.Htlcs)),
        }

        commit.CustomBlob.WhenSome(func(blob tlv.Blob) {
                rl.CustomBlob = tlv.SomeRecordT(
                        tlv.NewPrimitiveRecord[tlv.TlvType5, tlv.Blob](blob),
                )
        })

        if !noAmtData {
                rl.OurBalance = tlv.SomeRecordT(tlv.NewRecordT[tlv.TlvType3](
                        tlv.NewBigSizeT(commit.LocalBalance),
                ))

                rl.TheirBalance = tlv.SomeRecordT(tlv.NewRecordT[tlv.TlvType4](
                        tlv.NewBigSizeT(commit.RemoteBalance),
                ))
        }

        for _, htlc := range commit.Htlcs {
                // Skip dust HTLCs.
                if htlc.OutputIndex < 0 {
                        continue
                }

                // Sanity check that the output indexes can be safely
                // converted.
                if htlc.OutputIndex > math.MaxUint16 {
                        return ErrOutputIndexTooBig
                }

                entry, err := NewHTLCEntryFromHTLC(htlc)
                if err != nil {
                        return err
                }
                rl.HTLCEntries = append(rl.HTLCEntries, entry)
        }

        var b bytes.Buffer
        err := serializeRevocationLog(&b, rl)
        if err != nil {
                return err
        }

        logEntrykey := makeLogKey(commit.CommitHeight)
        return bucket.Put(logEntrykey[:], b.Bytes())
}

// fetchRevocationLog queries the revocation log bucket to find an log entry.
// Return an error if not found.
func fetchRevocationLog(log kvdb.RBucket,
        updateNum uint64) (RevocationLog, error) {

        logEntrykey := makeLogKey(updateNum)
        commitBytes := log.Get(logEntrykey[:])
        if commitBytes == nil {
                return RevocationLog{}, ErrLogEntryNotFound
        }

        commitReader := bytes.NewReader(commitBytes)

        return deserializeRevocationLog(commitReader)
}

// serializeRevocationLog serializes a RevocationLog record based on tlv
// format.
func serializeRevocationLog(w io.Writer, rl *RevocationLog) error {
        // Add the tlv records for all non-optional fields.
        records := []tlv.Record{
                rl.OurOutputIndex.Record(),
                rl.TheirOutputIndex.Record(),
                rl.CommitTxHash.Record(),
        }

        // Now we add any optional fields that are non-nil.
        rl.OurBalance.WhenSome(
                func(r tlv.RecordT[tlv.TlvType3, BigSizeMilliSatoshi]) {
                        records = append(records, r.Record())
                },
        )

        rl.TheirBalance.WhenSome(
                func(r tlv.RecordT[tlv.TlvType4, BigSizeMilliSatoshi]) {
                        records = append(records, r.Record())
                },
        )

        rl.CustomBlob.WhenSome(func(r tlv.RecordT[tlv.TlvType5, tlv.Blob]) {
                records = append(records, r.Record())
        })

        // Create the tlv stream.
        tlvStream, err := tlv.NewStream(records...)
        if err != nil {
                return err
        }

        // Write the tlv stream.
        if err := writeTlvStream(w, tlvStream); err != nil {
                return err
        }

        // Write the HTLCs.
        return serializeHTLCEntries(w, rl.HTLCEntries)
}

// serializeHTLCEntries serializes a list of HTLCEntry records based on tlv
// format.
func serializeHTLCEntries(w io.Writer, htlcs []*HTLCEntry) error {
        for _, htlc := range htlcs {
                // Create the tlv stream.
                tlvStream, err := htlc.toTlvStream()
                if err != nil {
                        return err
                }

                // Write the tlv stream.
                if err := writeTlvStream(w, tlvStream); err != nil {
                        return err
                }
        }

        return nil
}

// deserializeRevocationLog deserializes a RevocationLog based on tlv format.
func deserializeRevocationLog(r io.Reader) (RevocationLog, error) {
        var rl RevocationLog

        ourBalance := rl.OurBalance.Zero()
        theirBalance := rl.TheirBalance.Zero()
        customBlob := rl.CustomBlob.Zero()

        // Create the tlv stream.
        tlvStream, err := tlv.NewStream(
                rl.OurOutputIndex.Record(),
                rl.TheirOutputIndex.Record(),
                rl.CommitTxHash.Record(),
                ourBalance.Record(),
                theirBalance.Record(),
                customBlob.Record(),
        )
        if err != nil {
                return rl, err
        }

        // Read the tlv stream.
        parsedTypes, err := readTlvStream(r, tlvStream)
        if err != nil {
                return rl, err
        }

        if t, ok := parsedTypes[ourBalance.TlvType()]; ok && t == nil {
                rl.OurBalance = tlv.SomeRecordT(ourBalance)
        }

        if t, ok := parsedTypes[theirBalance.TlvType()]; ok && t == nil {
                rl.TheirBalance = tlv.SomeRecordT(theirBalance)
        }

        if t, ok := parsedTypes[customBlob.TlvType()]; ok && t == nil {
                rl.CustomBlob = tlv.SomeRecordT(customBlob)
        }

        // Read the HTLC entries.
        rl.HTLCEntries, err = deserializeHTLCEntries(r)

        return rl, err
}

// deserializeHTLCEntries deserializes a list of HTLC entries based on tlv
// format.
func deserializeHTLCEntries(r io.Reader) ([]*HTLCEntry, error) {
        var htlcs []*HTLCEntry

        for {
                var htlc HTLCEntry

                customBlob := htlc.CustomBlob.Zero()
                htlcIndex := htlc.HtlcIndex.Zero()

                // Create the tlv stream.
                records := []tlv.Record{
                        htlc.RHash.Record(),
                        htlc.RefundTimeout.Record(),
                        htlc.OutputIndex.Record(),
                        htlc.Incoming.Record(),
                        htlc.Amt.Record(),
                        customBlob.Record(),
                        htlcIndex.Record(),
                }

                tlvStream, err := tlv.NewStream(records...)
                if err != nil {
                        return nil, err
                }

                // Read the HTLC entry.
                parsedTypes, err := readTlvStream(r, tlvStream)
                if err != nil {
                        // We've reached the end when hitting an EOF.
                        if err == io.ErrUnexpectedEOF {
                                break
                        }
                        return nil, err
                }

                if t, ok := parsedTypes[customBlob.TlvType()]; ok && t == nil {
                        htlc.CustomBlob = tlv.SomeRecordT(customBlob)
                }

                if t, ok := parsedTypes[htlcIndex.TlvType()]; ok && t == nil {
                        htlc.HtlcIndex = tlv.SomeRecordT(htlcIndex)
                }

                // Append the entry.
                htlcs = append(htlcs, &htlc)
        }

        return htlcs, nil
}

// writeTlvStream is a helper function that encodes the tlv stream into the
// writer.
func writeTlvStream(w io.Writer, s *tlv.Stream) error {
        var b bytes.Buffer
        if err := s.Encode(&b); err != nil {
                return err
        }

        // Write the stream's length as a varint.
        err := tlv.WriteVarInt(w, uint64(b.Len()), &[8]byte{})
        if err != nil {
                return err
        }

        if _, err = w.Write(b.Bytes()); err != nil {
                return err
        }

        return nil
}

// readTlvStream is a helper function that decodes the tlv stream from the
// reader.
func readTlvStream(r io.Reader, s *tlv.Stream) (tlv.TypeMap, error) {
        var bodyLen uint64

        // Read the stream's length.
        bodyLen, err := tlv.ReadVarInt(r, &[8]byte{})
        switch {
        // We'll convert any EOFs to ErrUnexpectedEOF, since this results in an
        // invalid record.
        case err == io.EOF:
                return nil, io.ErrUnexpectedEOF

        // Other unexpected errors.
        case err != nil:
                return nil, err
        }

        // TODO(yy): add overflow check.
        lr := io.LimitReader(r, int64(bodyLen))

        return s.DecodeWithParsedTypes(lr)
}

// fetchOldRevocationLog finds the revocation log from the deprecated
// sub-bucket.
func fetchOldRevocationLog(log kvdb.RBucket,
        updateNum uint64) (ChannelCommitment, error) {

        logEntrykey := makeLogKey(updateNum)
        commitBytes := log.Get(logEntrykey[:])
        if commitBytes == nil {
                return ChannelCommitment{}, ErrLogEntryNotFound
        }

        commitReader := bytes.NewReader(commitBytes)
        return deserializeChanCommit(commitReader)
}

// fetchRevocationLogCompatible finds the revocation log from both the
// revocationLogBucket and revocationLogBucketDeprecated for compatibility
// concern. It returns three values,
//   - RevocationLog, if this is non-nil, it means we've found the log in the
//     new bucket.
//   - ChannelCommitment, if this is non-nil, it means we've found the log in the
//     old bucket.
//   - error, this can happen if the log cannot be found in neither buckets.
func fetchRevocationLogCompatible(chanBucket kvdb.RBucket,
        updateNum uint64) (*RevocationLog, *ChannelCommitment, error) {

        // Look into the new bucket first.
        logBucket := chanBucket.NestedReadBucket(revocationLogBucket)
        if logBucket != nil {
                rl, err := fetchRevocationLog(logBucket, updateNum)
                // We've found the record, no need to visit the old bucket.
                if err == nil {
                        return &rl, nil, nil
                }

                // Return the error if it doesn't say the log cannot be found.
                if err != ErrLogEntryNotFound {
                        return nil, nil, err
                }
        }

        // Otherwise, look into the old bucket and try to find the log there.
        oldBucket := chanBucket.NestedReadBucket(revocationLogBucketDeprecated)
        if oldBucket != nil {
                c, err := fetchOldRevocationLog(oldBucket, updateNum)
                if err != nil {
                        return nil, nil, err
                }

                // Found an old record and return it.
                return nil, &c, nil
        }

        // If both the buckets are nil, then the sub-buckets haven't been
        // created yet.
        if logBucket == nil && oldBucket == nil {
                return nil, nil, ErrNoPastDeltas
        }

        // Otherwise, we've tried to query the new bucket but the log cannot be
        // found.
        return nil, nil, ErrLogEntryNotFound
}

// fetchLogBucket returns a read bucket by visiting both the new and the old
// bucket.
func fetchLogBucket(chanBucket kvdb.RBucket) (kvdb.RBucket, error) {
        logBucket := chanBucket.NestedReadBucket(revocationLogBucket)
        if logBucket == nil {
                logBucket = chanBucket.NestedReadBucket(
                        revocationLogBucketDeprecated,
                )
                if logBucket == nil {
                        return nil, ErrNoPastDeltas
                }
        }

        return logBucket, nil
}

// deleteLogBucket deletes the both the new and old revocation log buckets.
func deleteLogBucket(chanBucket kvdb.RwBucket) error {
        // Check if the bucket exists and delete it.
        logBucket := chanBucket.NestedReadWriteBucket(
                revocationLogBucket,
        )
        if logBucket != nil {
                err := chanBucket.DeleteNestedBucket(revocationLogBucket)
                if err != nil {
                        return err
                }
        }

        // We also check whether the old revocation log bucket exists
        // and delete it if so.
        oldLogBucket := chanBucket.NestedReadWriteBucket(
                revocationLogBucketDeprecated,
        )
        if oldLogBucket != nil {
                err := chanBucket.DeleteNestedBucket(
                        revocationLogBucketDeprecated,
                )
                if err != nil {
                        return err
                }
        }

        return nil
}

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