16683051882

Committed 01 Aug 2025 07:03PM UTC coverage: 54.949% (-12.1%) from 67.047%

Build # 16683051882

Build Type

Pull #9455

github

Committed by

web-flow

Commit Message

Merge 3f1f50be8 into 37523b6cb

Pull Request Pull Request #9455: discovery+lnwire: add support for DNS host name in NodeAnnouncement msg

Run Details

144 of 226 new or added lines in 7 files covered. (63.72%)

23852 existing lines in 290 files now uncovered.

108751 of 197912 relevant lines covered (54.95%)

22080.83 hits per line

Source File
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70.04

/lnwire/lnwire.go

package lnwire

import (
        "bytes"
        "encoding/binary"
        "errors"
        "fmt"
        "image/color"
        "io"
        "math"
        "net"

        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/btcsuite/btcd/wire"
        "github.com/lightningnetwork/lnd/tor"
)

const (
        // MaxSliceLength is the maximum allowed length for any opaque byte
        // slices in the wire protocol.
        MaxSliceLength = 65535

        // MaxMsgBody is the largest payload any message is allowed to provide.
        // This is two less than the MaxSliceLength as each message has a 2
        // byte type that precedes the message body.
        MaxMsgBody = 65533

        // noAddrLength is the length of a no address (empty).
        noAddrLength = 0

        // tcp4AddrLength is the length of an IPv4 address
        // (4 bytes IP + 2 bytes port).
        tcp4AddrLength = 6

        // tcp6AddrLength is the length of an IPv6 address
        // (16 bytes IP + 2 bytes port).
        tcp6AddrLength = 18

        // OnionV2AddrLength is the length of a version 2 Tor onion service
        // address.
        OnionV2AddrLength = 12

        // OnionV3AddrLength is the length of a version 3 Tor onion service
        // address (35 bytes decoded onion + 2 bytes port).
        OnionV3AddrLength = 37
)

// PkScript is simple type definition which represents a raw serialized public
// key script.
type PkScript []byte

// addressType specifies the network protocol and version that should be used
// when connecting to a node at a particular address.
type addressType uint8

const (
        // noAddr denotes a blank address. An address of this type indicates
        // that a node doesn't have any advertised addresses.
        noAddr addressType = 0

        // tcp4Addr denotes an IPv4 TCP address.
        tcp4Addr addressType = 1

        // tcp6Addr denotes an IPv6 TCP address.
        tcp6Addr addressType = 2

        // v2OnionAddr denotes a version 2 Tor onion service address.
        v2OnionAddr addressType = 3

        // v3OnionAddr denotes a version 3 Tor (prop224) onion service address.
        v3OnionAddr addressType = 4

        // dnsHostnameAddr denotes a DNS hostname address.
        dnsHostnameAddr addressType = 5
)

// AddrLen returns the number of bytes that it takes to encode the target
// address.
func (a addressType) AddrLen(length uint16) uint16 {
        return length
}

// WriteElement is a one-stop shop to write the big endian representation of
// any element which is to be serialized for the wire protocol.
//
// TODO(yy): rm this method once we finish dereferencing it from other
// packages.
func WriteElement(w *bytes.Buffer, element interface{}) error {
        switch e := element.(type) {
        case NodeAlias:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case QueryEncoding:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint8:
                var b [1]byte
                b[0] = e
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case FundingFlag:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint16:
                var b [2]byte
                binary.BigEndian.PutUint16(b[:], e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case ChanUpdateMsgFlags:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case ChanUpdateChanFlags:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case MilliSatoshi:
                var b [8]byte
                binary.BigEndian.PutUint64(b[:], uint64(e))
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case btcutil.Amount:
                var b [8]byte
                binary.BigEndian.PutUint64(b[:], uint64(e))
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint32:
                var b [4]byte
                binary.BigEndian.PutUint32(b[:], e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint64:
                var b [8]byte
                binary.BigEndian.PutUint64(b[:], e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case *btcec.PublicKey:
                if e == nil {
                        return fmt.Errorf("cannot write nil pubkey")
                }

                var b [33]byte
                serializedPubkey := e.SerializeCompressed()
                copy(b[:], serializedPubkey)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case []Sig:
                var b [2]byte
                numSigs := uint16(len(e))
                binary.BigEndian.PutUint16(b[:], numSigs)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

                for _, sig := range e {
                        if err := WriteElement(w, sig); err != nil {
                                return err
                        }
                }

        case Sig:
                // Write buffer
                if _, err := w.Write(e.bytes[:]); err != nil {
                        return err
                }

        case PartialSig:
                if err := e.Encode(w); err != nil {
                        return err
                }

        case PingPayload:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case PongPayload:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case WarningData:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case ErrorData:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case OpaqueReason:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case [33]byte:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case []byte:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case PkScript:
                // The largest script we'll accept is a p2wsh which is exactly
                // 34 bytes long.
                scriptLength := len(e)
                if scriptLength > 34 {
                        return fmt.Errorf("'PkScript' too long")
                }

                if err := wire.WriteVarBytes(w, 0, e); err != nil {
                        return err
                }

        case *RawFeatureVector:
                if e == nil {
                        return fmt.Errorf("cannot write nil feature vector")
                }

                if err := e.Encode(w); err != nil {
                        return err
                }

        case wire.OutPoint:
                var h [32]byte
                copy(h[:], e.Hash[:])
                if _, err := w.Write(h[:]); err != nil {
                        return err
                }

                if e.Index > math.MaxUint16 {
                        return fmt.Errorf("index for outpoint (%v) is "+
                                "greater than max index of %v", e.Index,
                                math.MaxUint16)
                }

                var idx [2]byte
                binary.BigEndian.PutUint16(idx[:], uint16(e.Index))
                if _, err := w.Write(idx[:]); err != nil {
                        return err
                }

        case ChannelID:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case FailCode:
                if err := WriteElement(w, uint16(e)); err != nil {
                        return err
                }

        case ShortChannelID:
                // Check that field fit in 3 bytes and write the blockHeight
                if e.BlockHeight > ((1 << 24) - 1) {
                        return errors.New("block height should fit in 3 bytes")
                }

                var blockHeight [4]byte
                binary.BigEndian.PutUint32(blockHeight[:], e.BlockHeight)

                if _, err := w.Write(blockHeight[1:]); err != nil {
                        return err
                }

                // Check that field fit in 3 bytes and write the txIndex
                if e.TxIndex > ((1 << 24) - 1) {
                        return errors.New("tx index should fit in 3 bytes")
                }

                var txIndex [4]byte
                binary.BigEndian.PutUint32(txIndex[:], e.TxIndex)
                if _, err := w.Write(txIndex[1:]); err != nil {
                        return err
                }

                // Write the txPosition
                var txPosition [2]byte
                binary.BigEndian.PutUint16(txPosition[:], e.TxPosition)
                if _, err := w.Write(txPosition[:]); err != nil {
                        return err
                }

        case *net.TCPAddr:
                if err := WriteTCPAddr(w, e); err != nil {
                        return err
                }

        case *tor.OnionAddr:
                if err := WriteOnionAddr(w, e); err != nil {
                        return err
                }

        case *OpaqueAddrs:
                if err := WriteOpaqueAddrs(w, e); err != nil {
                        return err
                }

        case []net.Addr:
                // First, we'll encode all the addresses into an intermediate
                // buffer. We need to do this in order to compute the total
                // length of the addresses.
                var addrBuf bytes.Buffer
                for _, address := range e {
                        if err := WriteElement(&addrBuf, address); err != nil {
                                return err
                        }
                }

                // With the addresses fully encoded, we can now write out the
                // number of bytes needed to encode them.
                addrLen := addrBuf.Len()
                if err := WriteElement(w, uint16(addrLen)); err != nil {
                        return err
                }

                // Finally, we'll write out the raw addresses themselves, but
                // only if we have any bytes to write.
                if addrLen > 0 {
                        if _, err := w.Write(addrBuf.Bytes()); err != nil {
                                return err
                        }
                }

        case color.RGBA:
                if err := WriteElements(w, e.R, e.G, e.B); err != nil {
                        return err
                }

        case DeliveryAddress:
                var length [2]byte
                binary.BigEndian.PutUint16(length[:], uint16(len(e)))
                if _, err := w.Write(length[:]); err != nil {
                        return err
                }
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case bool:
                var b [1]byte
                if e {
                        b[0] = 1
                }
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case ExtraOpaqueData:
                return e.Encode(w)

        default:
                return fmt.Errorf("unknown type in WriteElement: %T", e)
        }

        return nil
}

// WriteElements is writes each element in the elements slice to the passed
// buffer using WriteElement.
//
// TODO(yy): rm this method once we finish dereferencing it from other
// packages.
func WriteElements(buf *bytes.Buffer, elements ...interface{}) error {
        for _, element := range elements {
                err := WriteElement(buf, element)
                if err != nil {
                        return err
                }
        }
        return nil
}

// ReadElement is a one-stop utility function to deserialize any datastructure
// encoded using the serialization format of lnwire.
func ReadElement(r io.Reader, element interface{}) error {
        var err error
        switch e := element.(type) {
        case *bool:
                var b [1]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }

                if b[0] == 1 {
                        *e = true
                }

        case *NodeAlias:
                var a [32]byte
                if _, err := io.ReadFull(r, a[:]); err != nil {
                        return err
                }

                alias, err := NewNodeAlias(string(a[:]))
                if err != nil {
                        return err
                }
                *e = alias

        case *QueryEncoding:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = QueryEncoding(b[0])

        case *uint8:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = b[0]

        case *FundingFlag:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = FundingFlag(b[0])

        case *uint16:
                var b [2]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = binary.BigEndian.Uint16(b[:])

        case *ChanUpdateMsgFlags:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = ChanUpdateMsgFlags(b[0])

        case *ChanUpdateChanFlags:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = ChanUpdateChanFlags(b[0])

        case *uint32:
                var b [4]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = binary.BigEndian.Uint32(b[:])

        case *uint64:
                var b [8]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = binary.BigEndian.Uint64(b[:])

        case *MilliSatoshi:
                var b [8]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = MilliSatoshi(int64(binary.BigEndian.Uint64(b[:])))

        case *btcutil.Amount:
                var b [8]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = btcutil.Amount(int64(binary.BigEndian.Uint64(b[:])))

        case **btcec.PublicKey:
                var b [btcec.PubKeyBytesLenCompressed]byte
                if _, err = io.ReadFull(r, b[:]); err != nil {
                        return err
                }

                pubKey, err := btcec.ParsePubKey(b[:])
                if err != nil {
                        return err
                }
                *e = pubKey

        case *RawFeatureVector:
                f := NewRawFeatureVector()
                err = f.Decode(r)
                if err != nil {
                        return err
                }
                *e = *f

        case **RawFeatureVector:
                f := NewRawFeatureVector()
                err = f.Decode(r)
                if err != nil {
                        return err
                }
                *e = f

        case *[]Sig:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                numSigs := binary.BigEndian.Uint16(l[:])

                var sigs []Sig
                if numSigs > 0 {
                        sigs = make([]Sig, numSigs)
                        for i := 0; i < int(numSigs); i++ {
                                if err := ReadElement(r, &sigs[i]); err != nil {
                                        return err
                                }
                        }
                }
                *e = sigs

        case *Sig:
                if _, err := io.ReadFull(r, e.bytes[:]); err != nil {
                        return err
                }

        case *OpaqueReason:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                reasonLen := binary.BigEndian.Uint16(l[:])

                *e = OpaqueReason(make([]byte, reasonLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *WarningData:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                errorLen := binary.BigEndian.Uint16(l[:])

                *e = WarningData(make([]byte, errorLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *ErrorData:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                errorLen := binary.BigEndian.Uint16(l[:])

                *e = ErrorData(make([]byte, errorLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *PingPayload:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                pingLen := binary.BigEndian.Uint16(l[:])

                *e = PingPayload(make([]byte, pingLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *PongPayload:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                pongLen := binary.BigEndian.Uint16(l[:])

                *e = PongPayload(make([]byte, pongLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *[33]byte:
                if _, err := io.ReadFull(r, e[:]); err != nil {
                        return err
                }

        case []byte:
                if _, err := io.ReadFull(r, e); err != nil {
                        return err
                }

        case *PkScript:
                pkScript, err := wire.ReadVarBytes(r, 0, 34, "pkscript")
                if err != nil {
                        return err
                }
                *e = pkScript

        case *wire.OutPoint:
                var h [32]byte
                if _, err = io.ReadFull(r, h[:]); err != nil {
                        return err
                }
                hash, err := chainhash.NewHash(h[:])
                if err != nil {
                        return err
                }

                var idxBytes [2]byte
                _, err = io.ReadFull(r, idxBytes[:])
                if err != nil {
                        return err
                }
                index := binary.BigEndian.Uint16(idxBytes[:])

                *e = wire.OutPoint{
                        Hash:  *hash,
                        Index: uint32(index),
                }

        case *FailCode:
                if err := ReadElement(r, (*uint16)(e)); err != nil {
                        return err
                }

        case *ChannelID:
                if _, err := io.ReadFull(r, e[:]); err != nil {
                        return err
                }

        case *ShortChannelID:
                var blockHeight [4]byte
                if _, err = io.ReadFull(r, blockHeight[1:]); err != nil {
                        return err
                }

                var txIndex [4]byte
                if _, err = io.ReadFull(r, txIndex[1:]); err != nil {
                        return err
                }

                var txPosition [2]byte
                if _, err = io.ReadFull(r, txPosition[:]); err != nil {
                        return err
                }

                *e = ShortChannelID{
                        BlockHeight: binary.BigEndian.Uint32(blockHeight[:]),
                        TxIndex:     binary.BigEndian.Uint32(txIndex[:]),
                        TxPosition:  binary.BigEndian.Uint16(txPosition[:]),
                }

        case *[]net.Addr:
                // First, we'll read the number of total bytes that have been
                // used to encode the set of addresses.
                var numAddrsBytes [2]byte
                if _, err = io.ReadFull(r, numAddrsBytes[:]); err != nil {
                        return err
                }
                addrsLen := binary.BigEndian.Uint16(numAddrsBytes[:])

                // With the number of addresses, read, we'll now pull in the
                // buffer of the encoded addresses into memory.
                addrs := make([]byte, addrsLen)
                if _, err := io.ReadFull(r, addrs[:]); err != nil {
                        return err
                }
                addrBuf := bytes.NewReader(addrs)

                // Finally, we'll parse the remaining address payload in
                // series, using the first byte to denote how to decode the
                // address itself.
                var (
                        addresses       []net.Addr
                        addrBytesRead   uint16
                        dnsAddrIncluded bool
                )

                for addrBytesRead < addrsLen {
                        var descriptor [1]byte
                        if _, err = io.ReadFull(addrBuf, descriptor[:]); err != nil {
                                return err
                        }

                        addrBytesRead++

                        var address net.Addr
                        switch aType := addressType(descriptor[0]); aType {
                        case noAddr:
                                addrBytesRead += aType.AddrLen(noAddrLength)
                                continue

                        case tcp4Addr:
                                var ip [4]byte
                                if _, err := io.ReadFull(addrBuf, ip[:]); err != nil {
                                        return err
                                }

                                var port [2]byte
                                if _, err := io.ReadFull(addrBuf, port[:]); err != nil {
                                        return err
                                }

                                address = &net.TCPAddr{
                                        IP:   net.IP(ip[:]),
                                        Port: int(binary.BigEndian.Uint16(port[:])),
                                }
                                addrBytesRead += aType.AddrLen(tcp4AddrLength)

                        case tcp6Addr:
                                var ip [16]byte
                                if _, err := io.ReadFull(addrBuf, ip[:]); err != nil {
                                        return err
                                }

                                var port [2]byte
                                if _, err := io.ReadFull(addrBuf, port[:]); err != nil {
                                        return err
                                }

                                address = &net.TCPAddr{
                                        IP:   net.IP(ip[:]),
                                        Port: int(binary.BigEndian.Uint16(port[:])),
                                }
                                addrBytesRead += aType.AddrLen(tcp6AddrLength)

                        case v2OnionAddr:
                                var h [tor.V2DecodedLen]byte
                                if _, err := io.ReadFull(addrBuf, h[:]); err != nil {
                                        return err
                                }

                                var p [2]byte
                                if _, err := io.ReadFull(addrBuf, p[:]); err != nil {
                                        return err
                                }

                                onionService := tor.Base32Encoding.EncodeToString(h[:])
                                onionService += tor.OnionSuffix
                                port := int(binary.BigEndian.Uint16(p[:]))

                                address = &tor.OnionAddr{
                                        OnionService: onionService,
                                        Port:         port,
                                }
                                addrBytesRead += aType.AddrLen(
                                        OnionV2AddrLength,
                                )

                        case v3OnionAddr:
                                var h [tor.V3DecodedLen]byte
                                if _, err := io.ReadFull(addrBuf, h[:]); err != nil {
                                        return err
                                }

                                var p [2]byte
                                if _, err := io.ReadFull(addrBuf, p[:]); err != nil {
                                        return err
                                }

                                onionService := tor.Base32Encoding.EncodeToString(h[:])
                                onionService += tor.OnionSuffix
                                port := int(binary.BigEndian.Uint16(p[:]))

                                address = &tor.OnionAddr{
                                        OnionService: onionService,
                                        Port:         port,
                                }
                                addrBytesRead += aType.AddrLen(
                                        OnionV3AddrLength,
                                )

                        case dnsHostnameAddr:
                                if dnsAddrIncluded {
                                        return ErrMultipleDNSAddresses
                                }
                                dnsAddrIncluded = true

                                // Read hostname length byte.
                                var hostnameLen [1]byte
                                _, err := io.ReadFull(addrBuf, hostnameLen[:])
                                if err != nil {
                                        return err
                                }

                                // Now read the hostname itself.
                                hostname := make([]byte, hostnameLen[0])
                                _, err = io.ReadFull(addrBuf, hostname)
                                if err != nil {
                                        return err
                                }

                                // Read port.
                                var port [2]byte
                                _, err = io.ReadFull(addrBuf, port[:])
                                if err != nil {
                                        return err
                                }

                                dnsAddr, err := NewDNSAddr(
                                        string(hostname),
                                        binary.BigEndian.Uint16(port[:]),
                                )
                                if err != nil {
                                        return err
                                }

                                address = dnsAddr

                                // Construct lengths for bytes read. This
                                // includes 1 byte for descriptor, hostname
                                // variable length, and 2 bytes for port.
                                length := 1 + uint16(hostnameLen[0]) + 2

                                addrBytesRead += aType.AddrLen(length)

                        default:
                                // If we don't understand this address type,
                                // we just store it along with the remaining
                                // address bytes as type OpaqueAddrs. We need
                                // to hold onto the bytes so that we can still
                                // write them back to the wire when we
                                // propagate this message.
                                payloadLen := 1 + addrsLen - addrBytesRead
                                payload := make([]byte, payloadLen)

                                // First write a byte for the address type that
                                // we already read.
                                payload[0] = byte(aType)

                                // Now append the rest of the address bytes.
                                _, err := io.ReadFull(addrBuf, payload[1:])
                                if err != nil {
                                        return err
                                }

                                address = &OpaqueAddrs{
                                        Payload: payload,
                                }
                                addrBytesRead = addrsLen
                        }

                        addresses = append(addresses, address)
                }

                *e = addresses

        case *color.RGBA:
                err := ReadElements(r,
                        &e.R,
                        &e.G,
                        &e.B,
                )
                if err != nil {
                        return err
                }

        case *DeliveryAddress:
                var addrLen [2]byte
                if _, err = io.ReadFull(r, addrLen[:]); err != nil {
                        return err
                }
                length := binary.BigEndian.Uint16(addrLen[:])

                var addrBytes [deliveryAddressMaxSize]byte

                if length > deliveryAddressMaxSize {
                        return fmt.Errorf(
                                "cannot read %d bytes into addrBytes", length,
                        )
                }
                if _, err = io.ReadFull(r, addrBytes[:length]); err != nil {
                        return err
                }
                *e = addrBytes[:length]

        case *PartialSig:
                var sig PartialSig
                if err = sig.Decode(r); err != nil {
                        return err
                }
                *e = sig

        case *ExtraOpaqueData:
                return e.Decode(r)

        default:
                return fmt.Errorf("unknown type in ReadElement: %T", e)
        }

        return nil
}

// ReadElements deserializes a variable number of elements into the passed
// io.Reader, with each element being deserialized according to the ReadElement
// function.
func ReadElements(r io.Reader, elements ...interface{}) error {
        for _, element := range elements {
                err := ReadElement(r, element)
                if err != nil {
                        return err
                }
        }
        return nil
}

lightningnetwork / lnd / 16683051882

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