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