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- package lnwire
- import (
- "bytes"
- "io"
- "github.com/lightningnetwork/lnd/tlv"
- )
- // FundingSigned is sent from Bob (the responder) to Alice (the initiator)
- // after receiving the funding outpoint and her signature for Bob's version of
- // the commitment transaction.
- type FundingSigned struct {
- // ChannelPoint is the particular active channel that this
- // FundingSigned is bound to.
- ChanID ChannelID
- // CommitSig is Bob's signature for Alice's version of the commitment
- // transaction.
- CommitSig Sig
- // PartialSig is used to transmit a musig2 extended partial signature
- // that also carries along the public nonce of the signer.
- //
- // NOTE: This field is only populated if a musig2 taproot channel is
- // being signed for. In this case, the above Sig type MUST be blank.
- PartialSig OptPartialSigWithNonceTLV
- // ExtraData is the set of data that was appended to this message to
- // fill out the full maximum transport message size. These fields can
- // be used to specify optional data such as custom TLV fields.
- ExtraData ExtraOpaqueData
- }
- // A compile time check to ensure FundingSigned implements the lnwire.Message
- // interface.
- var _ Message = (*FundingSigned)(nil)
- // Encode serializes the target FundingSigned into the passed io.Writer
- // implementation. Serialization will observe the rules defined by the passed
- // protocol version.
- //
- // This is part of the lnwire.Message interface.
- func (f *FundingSigned) Encode(w *bytes.Buffer, pver uint32) error {
- recordProducers := make([]tlv.RecordProducer, 0, 1)
- f.PartialSig.WhenSome(func(sig PartialSigWithNonceTLV) {
- recordProducers = append(recordProducers, &sig)
- })
- err := EncodeMessageExtraData(&f.ExtraData, recordProducers...)
- if err != nil {
- return err
- }
- if err := WriteChannelID(w, f.ChanID); err != nil {
- return err
- }
- if err := WriteSig(w, f.CommitSig); err != nil {
- return err
- }
- return WriteBytes(w, f.ExtraData)
- }
- // Decode deserializes the serialized FundingSigned stored in the passed
- // io.Reader into the target FundingSigned using the deserialization rules
- // defined by the passed protocol version.
- //
- // This is part of the lnwire.Message interface.
- func (f *FundingSigned) Decode(r io.Reader, pver uint32) error {
- err := ReadElements(r, &f.ChanID, &f.CommitSig)
- if err != nil {
- return err
- }
- var tlvRecords ExtraOpaqueData
- if err := ReadElements(r, &tlvRecords); err != nil {
- return err
- }
- partialSig := f.PartialSig.Zero()
- typeMap, err := tlvRecords.ExtractRecords(&partialSig)
- if err != nil {
- return err
- }
- // Set the corresponding TLV types if they were included in the stream.
- if val, ok := typeMap[f.PartialSig.TlvType()]; ok && val == nil {
- f.PartialSig = tlv.SomeRecordT(partialSig)
- }
- if len(tlvRecords) != 0 {
- f.ExtraData = tlvRecords
- }
- return nil
- }
- // MsgType returns the uint32 code which uniquely identifies this message as a
- // FundingSigned on the wire.
- //
- // This is part of the lnwire.Message interface.
- func (f *FundingSigned) MsgType() MessageType {
- return MsgFundingSigned
- }
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