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91 lines
2.9 KiB
91 lines
2.9 KiB
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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// 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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// NewRevokeAndAck creates a new RevokeAndAck message. |
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func NewRevokeAndAck() *RevokeAndAck { |
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return &RevokeAndAck{ |
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ExtraData: make([]byte, 0), |
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} |
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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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&c.ExtraData, |
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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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c.ExtraData, |
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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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// 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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