package lnwire import ( "io" "github.com/btcsuite/btcd/btcec" ) // RevokeAndAck is sent by either side once a CommitSig message has been // received, and validated. This message serves to revoke the prior commitment // transaction, which was the most up to date version until a CommitSig message // referencing the specified ChannelPoint was received. Additionally, this // message also piggyback's the next revocation hash that Alice should use when // constructing the Bob's version of the next commitment transaction (which // would be done before sending a CommitSig message). This piggybacking allows // Alice to send the next CommitSig message modifying Bob's commitment // transaction without first asking for a revocation hash initially. type RevokeAndAck struct { // ChanID uniquely identifies to which currently active channel this // RevokeAndAck applies to. ChanID ChannelID // Revocation is the preimage to the revocation hash of the now prior // commitment transaction. Revocation [32]byte // NextRevocationKey is the next commitment point which should be used // for the next commitment transaction the remote peer creates for us. // This, in conjunction without revocation base point will be used to // create the proper revocation key used within the commitment // transaction. NextRevocationKey *btcec.PublicKey } // NewRevokeAndAck creates a new RevokeAndAck message. func NewRevokeAndAck() *RevokeAndAck { return &RevokeAndAck{} } // A compile time check to ensure RevokeAndAck implements the lnwire.Message // interface. var _ Message = (*RevokeAndAck)(nil) // Decode deserializes a serialized RevokeAndAck message stored in the // passed io.Reader observing the specified protocol version. // // This is part of the lnwire.Message interface. func (c *RevokeAndAck) Decode(r io.Reader, pver uint32) error { return ReadElements(r, &c.ChanID, c.Revocation[:], &c.NextRevocationKey, ) } // Encode serializes the target RevokeAndAck into the passed io.Writer // observing the protocol version specified. // // This is part of the lnwire.Message interface. func (c *RevokeAndAck) Encode(w io.Writer, pver uint32) error { return WriteElements(w, c.ChanID, c.Revocation[:], c.NextRevocationKey, ) } // MsgType returns the integer uniquely identifying this message type on the // wire. // // This is part of the lnwire.Message interface. func (c *RevokeAndAck) MsgType() MessageType { return MsgRevokeAndAck } // MaxPayloadLength returns the maximum allowed payload size for a RevokeAndAck // complete message observing the specified protocol version. // // This is part of the lnwire.Message interface. func (c *RevokeAndAck) MaxPayloadLength(uint32) uint32 { // 32 + 32 + 33 return 97 }