package lnwire import ( "io" "github.com/roasbeef/btcd/btcec" "github.com/roasbeef/btcd/wire" ) // CommitSig is sent by either side to stage any pending HTLC's in the // receiver's pending set into a new commitment state. Implicitly, the new // commitment transaction constructed which has been signed by CommitSig // includes all HTLC's in the remote node's pending set. A CommitSig message // may be sent after a series of UpdateAddHTLC/UpdateFufillHTLC messages in // order to batch add several HTLC's with a single signature covering all // implicitly accepted HTLC's. type CommitSig struct { // ChannelPoint uniquely identifies to which currently active channel // this CommitSig applies to. ChannelPoint wire.OutPoint // CommitSig is Alice's signature for Bob's new commitment transaction. // Alice is able to send this signature without requesting any // additional data due to the piggybacking of Bob's next revocation // hash in his prior RevokeAndAck message, as well as the canonical // ordering used for all inputs/outputs within commitment transactions. CommitSig *btcec.Signature // TODO(roasbeef): add HTLC sigs after state machine is updated to // support that } // NewCommitSig creates a new empty CommitSig message. func NewCommitSig() *CommitSig { return &CommitSig{} } // A compile time check to ensure CommitSig implements the lnwire.Message // interface. var _ Message = (*CommitSig)(nil) // Decode deserializes a serialized CommitSig message stored in the // passed io.Reader observing the specified protocol version. // // This is part of the lnwire.Message interface. func (c *CommitSig) Decode(r io.Reader, pver uint32) error { // ChannelPoint(8) // RequesterCommitSig(73max+2) return readElements(r, &c.ChannelPoint, &c.CommitSig, ) } // Encode serializes the target CommitSig into the passed io.Writer // observing the protocol version specified. // // This is part of the lnwire.Message interface. func (c *CommitSig) Encode(w io.Writer, pver uint32) error { return writeElements(w, c.ChannelPoint, c.CommitSig, ) } // Command returns the integer uniquely identifying this message type on the // wire. // // This is part of the lnwire.Message interface. func (c *CommitSig) Command() uint32 { return CmdCommitSig } // MaxPayloadLength returns the maximum allowed payload size for a // CommitSig complete message observing the specified protocol version. // // This is part of the lnwire.Message interface. func (c *CommitSig) MaxPayloadLength(uint32) uint32 { // 36 + 73 return 109 } // Validate performs any necessary sanity checks to ensure all fields present // on the CommitSig are valid. // // This is part of the lnwire.Message interface. func (c *CommitSig) Validate() error { // We're good! return nil }