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