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https://github.com/lightningnetwork/lnd.git
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7feb8b21e1
In this commit, we update new Taproot related TLVs (nonces, partial sig, sig with nonce, etc). Along the way we were able to get rid of some boiler plate, but most importantly, we're able to better protect against API misuse (using a nonce that isn't initialized, etc) with the new options API. In some areas this introduces a bit of extra boiler plate, and where applicable I used some new helper functions to help cut down on the noise. Note to reviewers: this is done as a single commit, as changing the API breaks all callers, so if we want things to compile it needs to be in a wumbo commit.
106 lines
3.0 KiB
Go
106 lines
3.0 KiB
Go
package lnwire
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import (
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"bytes"
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"io"
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"github.com/lightningnetwork/lnd/tlv"
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)
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// FundingSigned is sent from Bob (the responder) to Alice (the initiator)
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// after receiving the funding outpoint and her signature for Bob's version of
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// the commitment transaction.
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type FundingSigned struct {
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// ChannelPoint is the particular active channel that this
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// FundingSigned is bound to.
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ChanID ChannelID
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// CommitSig is Bob's signature for Alice's version of the commitment
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// transaction.
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CommitSig Sig
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// PartialSig is used to transmit a musig2 extended partial signature
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// that also carries along the public nonce of the signer.
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//
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// NOTE: This field is only populated if a musig2 taproot channel is
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// being signed for. In this case, the above Sig type MUST be blank.
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PartialSig OptPartialSigWithNonceTLV
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// ExtraData is the set of data that was appended to this message to
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// fill out the full maximum transport message size. These fields can
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// be used to specify optional data such as custom TLV fields.
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ExtraData ExtraOpaqueData
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}
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// A compile time check to ensure FundingSigned implements the lnwire.Message
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// interface.
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var _ Message = (*FundingSigned)(nil)
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// Encode serializes the target FundingSigned into the passed io.Writer
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// implementation. Serialization will observe the rules defined by the passed
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// protocol version.
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//
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// This is part of the lnwire.Message interface.
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func (f *FundingSigned) Encode(w *bytes.Buffer, pver uint32) error {
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recordProducers := make([]tlv.RecordProducer, 0, 1)
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f.PartialSig.WhenSome(func(sig PartialSigWithNonceTLV) {
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recordProducers = append(recordProducers, &sig)
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})
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err := EncodeMessageExtraData(&f.ExtraData, recordProducers...)
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if err != nil {
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return err
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}
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if err := WriteChannelID(w, f.ChanID); err != nil {
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return err
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}
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if err := WriteSig(w, f.CommitSig); err != nil {
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return err
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}
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return WriteBytes(w, f.ExtraData)
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}
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// Decode deserializes the serialized FundingSigned stored in the passed
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// io.Reader into the target FundingSigned using the deserialization rules
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// defined by the passed protocol version.
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//
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// This is part of the lnwire.Message interface.
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func (f *FundingSigned) Decode(r io.Reader, pver uint32) error {
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err := ReadElements(r, &f.ChanID, &f.CommitSig)
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if err != nil {
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return err
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}
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var tlvRecords ExtraOpaqueData
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if err := ReadElements(r, &tlvRecords); err != nil {
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return err
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}
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partialSig := f.PartialSig.Zero()
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typeMap, err := tlvRecords.ExtractRecords(&partialSig)
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if err != nil {
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return err
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}
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// Set the corresponding TLV types if they were included in the stream.
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if val, ok := typeMap[f.PartialSig.TlvType()]; ok && val == nil {
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f.PartialSig = tlv.SomeRecordT(partialSig)
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}
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if len(tlvRecords) != 0 {
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f.ExtraData = tlvRecords
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}
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return nil
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}
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// MsgType returns the uint32 code which uniquely identifies this message as a
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// FundingSigned on the wire.
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//
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// This is part of the lnwire.Message interface.
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func (f *FundingSigned) MsgType() MessageType {
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return MsgFundingSigned
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}
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